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RRB JE CBT 2 Mechanical Engineering Practice Paper 02 (Exam Pattern, Solved Set)

RRB JE (Junior Engineer) • 2026 • 150 Questions • Free practice with solutions

Subjects included:General Awareness (15)General Science (25)Computer Knowledge (10)Mechanical Engineering (SSC JE) (100)

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Showing 150 Questions with Step-by-Step Solutions

Q1General Awareness

Easy

The Pradhan Mantri Gram Sadak Yojana provides:

A. Rural railway lines

B. Rural electricity

C. Village schools

D. All-weather rural roads

View answer and explanation

Correct Option: D

It was launched in 2000.

Q2General Awareness

Medium

Bharatmala Pariyojana is a programme for:

A. Highway and road corridors

B. Ports

C. Inland waterways

D. Rural housing

View answer and explanation

Correct Option: A

Sagarmala is the port-led programme.

Q3General Awareness

Medium

The Sagarmala programme focuses on:

A. Hill railways

B. Port-led development

C. Airports

D. Metro rail

View answer and explanation

Correct Option: B

It aims to modernise ports and coastal logistics.

Q4General Awareness

Medium

The PM Gati Shakti National Master Plan was launched in:

A. 2019

B. 2015

C. 2021

D. 2023

View answer and explanation

Correct Option: C

On 13 October 2021, for integrated infrastructure planning.

Q5General Awareness

Easy

The UDAN scheme aims to improve:

A. Port capacity

B. Rural roads

C. Railway safety

D. Regional air connectivity

View answer and explanation

Correct Option: D

Ude Desh ka Aam Nagrik.

Q6General Awareness

Medium

The Atal Tunnel, under the Rohtang Pass, is in:

A. Himachal Pradesh

B. Jammu and Kashmir

C. Uttarakhand

D. Sikkim

View answer and explanation

Correct Option: A

It links Manali with the Lahaul valley.

Q7General Awareness

Medium

The Bogibeel rail-cum-road bridge in Assam is built over the:

A. Ganga

B. Brahmaputra

C. Barak

D. Teesta

View answer and explanation

Correct Option: B

It is India's longest rail-cum-road bridge.

Q8General Awareness

Medium

The Pamban rail bridge connects the mainland with:

A. Andaman Islands

B. Sri Lanka

C. Rameswaram island

D. Lakshadweep

View answer and explanation

Correct Option: C

A new vertical-lift bridge has been built beside the old one.

Q9General Awareness

Easy

The Sardar Sarovar Dam is built on the river:

A. Sabarmati

B. Tapi

C. Mahi

D. Narmada

View answer and explanation

Correct Option: D

It is in Gujarat.

Q10General Awareness

Easy

The Tehri Dam is built on the river:

A. Bhagirathi

B. Alaknanda

C. Yamuna

D. Sutlej

View answer and explanation

Correct Option: A

It is in Uttarakhand.

Q11General Awareness

Easy

The Kudankulam Nuclear Power Plant is in:

A. Kerala

B. Tamil Nadu

C. Andhra Pradesh

D. Karnataka

View answer and explanation

Correct Option: B

It was built with Russian cooperation.

Q12General Awareness

Easy

NTPC is India's largest:

A. Oil company

B. Steel maker

C. Power generation company

D. Railway contractor

View answer and explanation

Correct Option: C

National Thermal Power Corporation.

Q13General Awareness

Easy

BHEL mainly manufactures:

A. Medicines

B. Aircraft

C. Railway coaches

D. Power plant and electrical equipment

View answer and explanation

Correct Option: D

Bharat Heavy Electricals Limited.

Q14General Awareness

Medium

The Bhadla Solar Park is located in:

A. Rajasthan

B. Gujarat

C. Karnataka

D. Madhya Pradesh

View answer and explanation

Correct Option: A

It is one of the largest solar parks in the world.

Q15General Awareness

Easy

Engineers' Day in India is observed on:

A. 14 December

B. 15 September

C. 28 February

D. 5 June

View answer and explanation

Correct Option: B

It is the birth anniversary of M. Visvesvaraya.

Q16General Science

Medium

Young's double-slit experiment demonstrated the:

A. Speed of light

B. Particle nature of light

C. Wave nature of light (interference)

D. Photoelectric effect

View answer and explanation

Correct Option: C

Bright and dark fringes show interference.

Q17General Science

Easy

The photoelectric effect was explained by:

A. Niels Bohr

B. Isaac Newton

C. Max Planck

D. Albert Einstein

View answer and explanation

Correct Option: D

He received the 1921 Nobel Prize for it.

Q18General Science

Medium

In a nuclear reactor, the moderator is used to:

A. Slow down neutrons

B. Absorb all neutrons

C. Cool the reactor only

D. Speed up neutrons

View answer and explanation

Correct Option: A

Slow neutrons cause fission of U-235 more easily; heavy water and graphite are common moderators.

Q19General Science

Easy

Nuclear power reactors usually use fission of:

A. Hydrogen

B. Uranium-235

C. Carbon-12

D. Iron-56

View answer and explanation

Correct Option: B

Fission releases large amounts of energy.

Q20General Science

Medium

The pH of a 0.01 M solution of HCl is:

A. 0.01

B. 1

C. 2

D. 12

View answer and explanation

Correct Option: C

[H+] = 10^-2, so pH = 2.

Q21General Science

Easy

Temporary hardness of water can be removed by:

A. Chlorination

B. Adding salt

C. Filtration

D. Boiling

View answer and explanation

Correct Option: D

Boiling removes calcium and magnesium bicarbonates.

Q22General Science

Medium

Permanent hardness of water can be removed by:

A. Adding washing soda

B. Boiling

C. Filtration

D. Aeration

View answer and explanation

Correct Option: A

Sodium carbonate precipitates calcium and magnesium; ion exchange also works.

Q23General Science

Medium

The largest constituent of ordinary Portland cement is:

A. Silica (SiO₂)

B. Lime (CaO)

C. Alumina (Al₂O₃)

D. Iron oxide

View answer and explanation

Correct Option: B

Lime is about 60-67%.

Q24General Science

Medium

Gypsum is added to cement to:

A. Make it waterproof

B. Increase its colour

C. Control its setting time

D. Reduce its strength

View answer and explanation

Correct Option: C

It prevents flash setting.

Q25General Science

Medium

The corrosion of iron is mainly an:

A. Nuclear reaction

B. Physical change

C. Reduction reaction

D. Electrochemical oxidation

View answer and explanation

Correct Option: D

Anodic and cathodic areas form on the metal surface.

Q26General Science

Medium

In cathodic protection by a sacrificial anode, iron is connected to:

A. A more reactive metal such as zinc or magnesium

B. A less reactive metal such as copper

C. A plastic sheet

D. A glass rod

View answer and explanation

Correct Option: A

The more reactive metal corrodes instead of iron.

Q27General Science

Easy

The unit of molarity is:

A. g/L

B. mol/L

C. mol/kg

D. g/mol

View answer and explanation

Correct Option: B

Moles of solute per litre of solution.

Q28General Science

Easy

A galvanic (voltaic) cell converts:

A. Heat into light

B. Electrical energy into chemical energy

C. Chemical energy into electrical energy

D. Light into electricity

View answer and explanation

Correct Option: C

An electrolytic cell does the reverse.

Q29General Science

Easy

Steel is an alloy of iron and:

A. Lead

B. Copper

C. Tin

D. Carbon

View answer and explanation

Correct Option: D

Small amounts of carbon make iron much stronger.

Q30General Science

Easy

PVC is an example of a:

A. Thermoplastic polymer

B. Thermosetting plastic

C. Natural fibre

D. Metal alloy

View answer and explanation

Correct Option: A

It softens on heating and can be remoulded.

Q31Computer Knowledge

Easy

The keyboard shortcut to copy in Windows is:

A. Ctrl + X

B. Ctrl + V

C. Ctrl + C

D. Ctrl + P

View answer and explanation

Correct Option: C

Ctrl + V pastes and Ctrl + X cuts.

Q32Computer Knowledge

Easy

The keyboard shortcut to undo an action is:

A. Ctrl + S

B. Ctrl + Y

C. Ctrl + U

D. Ctrl + Z

View answer and explanation

Correct Option: D

Ctrl + Y redoes.

Q33Computer Knowledge

Easy

The default file extension of a modern MS Excel workbook is:

A. .xlsx

B. .docx

C. .pptx

D. .txt

View answer and explanation

Correct Option: A

.docx is Word and .pptx is PowerPoint.

Q34Computer Knowledge

Easy

In MS Excel, the function used to add a range of numbers is:

A. ADD

B. SUM

C. TOTAL

D. PLUS

View answer and explanation

Correct Option: B

For example, =SUM(A1:A10).

Q35Computer Knowledge

Easy

URL stands for:

A. Uniform Reference Line

B. Universal Resource Link

C. Uniform Resource Locator

D. Unified Resource Locator

View answer and explanation

Correct Option: C

It is a web address.

Q36Computer Knowledge

Easy

HTTP stands for:

A. Host Transfer Text Protocol

B. High Transfer Text Protocol

C. HyperText Transmission Program

D. HyperText Transfer Protocol

View answer and explanation

Correct Option: D

HTTPS is the secure version.

Q37Computer Knowledge

Easy

Which symbol separates the user name from the domain in an e-mail address?

A. @

B. #

C. &

D. %

View answer and explanation

Correct Option: A

For example, [email protected].

Q38Computer Knowledge

Easy

A firewall is used to:

A. Speed up the internet

B. Block unauthorised access to a network

C. Print documents

D. Store files

View answer and explanation

Correct Option: B

It filters network traffic.

Q39Computer Knowledge

Medium

A malicious program that copies itself and spreads across networks without needing a host file is a:

A. Spreadsheet

B. Virus

C. Worm

D. Compiler

View answer and explanation

Correct Option: C

A virus needs to attach itself to a host file.

Q40Computer Knowledge

Easy

LAN stands for:

A. Local Access Number

B. Large Area Network

C. Long Access Node

D. Local Area Network

View answer and explanation

Correct Option: D

A network within a building or campus.

Q41General Science

Medium

A catalytic converter in a vehicle mainly:

A. Converts carbon monoxide and nitrogen oxides into less harmful gases

B. Increases engine power

C. Filters dust from fuel

D. Cools the exhaust

View answer and explanation

Correct Option: A

It uses platinum-group metals as catalysts.

Q42General Science

Medium

Eutrophication of lakes is caused by excess:

A. Oxygen

B. Nutrients such as phosphates and nitrates

C. Fish

D. Sunlight

View answer and explanation

Correct Option: B

Algae bloom and then deplete oxygen.

Q43General Science

Easy

The gas that leaked in the 1984 Bhopal tragedy was:

A. Ammonia

B. Chlorine

C. Methyl isocyanate

D. Carbon monoxide

View answer and explanation

Correct Option: C

It leaked from a pesticide plant.

Q44General Science

Medium

Minamata disease is caused by poisoning from:

A. Arsenic

B. Cadmium

C. Lead

D. Mercury

View answer and explanation

Correct Option: D

It was first seen in Minamata, Japan.

Q45General Science

Medium

Itai-itai disease is caused by poisoning from:

A. Cadmium

B. Mercury

C. Fluoride

D. Copper

View answer and explanation

Correct Option: A

It affects bones and kidneys.

Q46General Science

Medium

The Central Pollution Control Board was set up under the:

A. Environment (Protection) Act, 1986

B. Water (Prevention and Control of Pollution) Act, 1974

C. Air Act, 1981

D. Forest Act, 1927

View answer and explanation

Correct Option: B

Its powers were extended by the Air Act of 1981.

Q47General Science

Easy

The Environment (Protection) Act was passed in:

A. 1981

B. 1974

C. 1986

D. 1972

View answer and explanation

Correct Option: C

It followed the Bhopal gas tragedy.

Q48General Science

Easy

The ozone layer lies mainly in the:

A. Thermosphere

B. Troposphere

C. Mesosphere

D. Stratosphere

View answer and explanation

Correct Option: D

About 15 to 35 km above the Earth.

Q49General Science

Easy

Which of these is a renewable source of energy?

A. Wind

B. Coal

C. Diesel

D. Natural gas

View answer and explanation

Correct Option: A

It will not run out.

Q50General Science

Medium

Primary treatment of sewage mainly removes:

A. Dissolved organic matter by microbes

B. Suspended solids by settling

C. Pathogens by chlorination

D. Nutrients by chemical dosing

View answer and explanation

Correct Option: B

Secondary treatment uses microbes.

Q51Mechanical Engineering (SSC JE)

Hard

A rigid vessel of 0.5 m³ contains air at 2 bar and 300 K. Taking R = 0.287 kJ/kg·K, the mass of air is

A. 2.32 kg

B. 0.116 kg

C. 1.16 kg

D. 11.6 kg

View answer and explanation

Correct Option: C

m = pV/RT = (200 × 0.5) / (0.287 × 300) = 100 / 86.1 = 1.16 kg.

Q52Mechanical Engineering (SSC JE)

Hard

One kg of air at 300 K is compressed isothermally from 1 bar to 4 bar (R = 0.287 kJ/kg·K). The work done on the air is about

A. 86.1 kJ

B. 238.8 kJ

C. 119.4 kJ

D. 59.7 kJ

View answer and explanation

Correct Option: C

W = RT ln(p2/p1) = 0.287 × 300 × ln 4 = 86.1 × 1.386 = 119.4 kJ.

Q53Mechanical Engineering (SSC JE)

Easy

A heat engine receives 500 kJ of heat and rejects 300 kJ. Its thermal efficiency is

A. 66.7 percent

B. 25 percent

C. 60 percent

D. 40 percent

View answer and explanation

Correct Option: D

W = 500 − 300 = 200 kJ. η = 200/500 = 0.4.

Q54Mechanical Engineering (SSC JE)

Easy

A refrigerator has a COP of 4. When the same machine is used as a heat pump, its COP is

A. 5

B. 3

C. 0.25

D. 4

View answer and explanation

Correct Option: A

COP(heat pump) = COP(refrigerator) + 1, because Q_H = Q_L + W.

Q55Mechanical Engineering (SSC JE)

Easy

Heat of 600 kJ is added reversibly to a system at a constant temperature of 300 K. The change of entropy of the system is

A. 180 kJ/K

B. 0.5 kJ/K

C. 200 kJ/K

D. 2 kJ/K

View answer and explanation

Correct Option: D

ΔS = Q/T = 600/300 = 2 kJ/K.

Q56Mechanical Engineering (SSC JE)

Hard

Wet steam has a dryness fraction of 0.9. If hf = 500 kJ/kg and hfg = 2000 kJ/kg, its enthalpy is

A. 2000 kJ/kg

B. 1800 kJ/kg

C. 2500 kJ/kg

D. 2300 kJ/kg

View answer and explanation

Correct Option: D

h = hf + x hfg = 500 + 0.9 × 2000 = 2300 kJ/kg.

Q57Mechanical Engineering (SSC JE)

Medium

Among the Otto, Diesel and Dual cycles with the same compression ratio and the same heat input, the air standard efficiency is highest for the

A. Otto cycle

B. None; all three are equal

C. Dual cycle

D. Diesel cycle

View answer and explanation

Correct Option: A

For the same compression ratio, Otto > Dual > Diesel, because all the heat in the Otto cycle is added at constant volume (at the highest mean temperature).

Q58Mechanical Engineering (SSC JE)

Easy

According to Dalton’s law of partial pressures, the total pressure of a gas mixture is

A. the sum of the partial pressures of its components

B. the product of the partial pressures of its components

C. the average of the partial pressures

D. equal to the highest partial pressure

View answer and explanation

Correct Option: A

Each ideal gas in the mixture exerts the pressure it would exert if it alone occupied the volume.

Q59Mechanical Engineering (SSC JE)

Easy

A polytropic process pvⁿ = constant with n = 0 is

A. an isobaric (constant pressure) process

B. an isochoric process

C. an isentropic process

D. an isothermal process

View answer and explanation

Correct Option: A

n = 0 gives p = constant. n = 1 is isothermal, n = γ is isentropic and n = ∞ is isochoric.

Q60Mechanical Engineering (SSC JE)

Hard

An ideal gas expands adiabatically from p1V1 = 500 kJ to p2V2 = 300 kJ. With γ = 1.4, the work done by the gas is

A. 125 kJ

B. 200 kJ

C. 800 kJ

D. 500 kJ

View answer and explanation

Correct Option: D

W = (p1V1 − p2V2)/(γ − 1) = (500 − 300)/0.4 = 500 kJ.

Q61Mechanical Engineering (SSC JE)

Medium

The Joule-Thomson coefficient of an ideal gas is

A. infinite

B. positive

C. zero

D. negative

View answer and explanation

Correct Option: C

The enthalpy of an ideal gas depends only on temperature, so throttling causes no temperature change.

Q62Mechanical Engineering (SSC JE)

Medium

The Clausius inequality for a cycle can be written as

A. ∮ δQ/T > 0 always

B. ∮ δQ/T ≥ 0

C. ∮ δQ/T = 1

D. ∮ δQ/T ≤ 0

View answer and explanation

Correct Option: D

It is zero for a reversible cycle and negative for an irreversible one.

Q63Mechanical Engineering (SSC JE)

Hard

A Pitot-static tube in air (ρ = 1.2 kg/m³) reads a pressure difference of 1.8 kPa between the stagnation and static pressures. The air velocity is

A. 54.8 m/s

B. 77.5 m/s

C. 27.4 m/s

D. 38.7 m/s

View answer and explanation

Correct Option: A

v = √(2Δp/ρ) = √(2 × 1800 / 1.2) = √3000 = 54.8 m/s.

Q64Mechanical Engineering (SSC JE)

Easy

In fully developed laminar flow in a circular pipe, the maximum velocity is

A. twice the mean velocity

B. 1.5 times the mean velocity

C. equal to the mean velocity

D. three times the mean velocity

View answer and explanation

Correct Option: A

The parabolic profile has umax = 2 × the average velocity.

Q65Mechanical Engineering (SSC JE)

Easy

For laminar flow in a pipe at a Reynolds number of 1600, the Darcy friction factor is

A. 0.004

B. 0.02

C. 0.4

D. 0.04

View answer and explanation

Correct Option: D

f = 64/Re = 64/1600 = 0.04.

Q66Mechanical Engineering (SSC JE)

Hard

A pump delivers 0.05 m³/s of water against a head of 20 m with an overall efficiency of 70 percent. The input power is about

A. 9.81 kW

B. 7.0 kW

C. 14.0 kW

D. 19.6 kW

View answer and explanation

Correct Option: C

Hydraulic power = ρgQH = 9810 × 0.05 × 20 = 9.81 kW. Input = 9.81/0.7 = 14.0 kW.

Q67Mechanical Engineering (SSC JE)

Medium

The specific speed of a hydraulic turbine, in terms of the speed N, power P and head H, is

A. N√Q / H^(3/4)

B. N√P / H^(3/4)

C. N P / H²

D. N√P / H^(5/4)

View answer and explanation

Correct Option: D

For turbines Ns = N√P / H^(5/4). The expression N√Q / H^(3/4) is the specific speed of a pump.

Q68Mechanical Engineering (SSC JE)

Easy

If the speed of a centrifugal pump is doubled, the head produced (by the affinity laws) becomes

A. 2 times

B. 16 times

C. 8 times

D. 4 times

View answer and explanation

Correct Option: D

H ∝ N² D², so doubling N makes H four times, Q twice and power eight times.

Q69Mechanical Engineering (SSC JE)

Medium

A Pelton wheel gives maximum efficiency when the bucket speed is

A. half the jet speed

B. equal to the jet speed

C. double the jet speed

D. one-third of the jet speed

View answer and explanation

Correct Option: A

For symmetrical buckets turning the jet through 180°, the maximum hydraulic efficiency occurs at u = v/2.

Q70Mechanical Engineering (SSC JE)

Easy

For an orifice, Cc = 0.62 and Cv = 0.97. The coefficient of discharge is

A. 0.60

B. 0.62

C. 0.97

D. 1.59

View answer and explanation

Correct Option: A

Cd = Cc × Cv = 0.62 × 0.97 = 0.601.

Q71Mechanical Engineering (SSC JE)

Hard

The Net Positive Suction Head (NPSH) available at the pump inlet is

A. the total head at the suction above the vapour pressure head of the liquid

B. the delivery head minus the suction head

C. the static head of the liquid

D. the head lost in friction in the delivery pipe

View answer and explanation

Correct Option: A

It must exceed the required NPSH of the pump to avoid cavitation.

Q72Mechanical Engineering (SSC JE)

Hard

Air at 300 K flows at 100 m/s (cp = 1005 J/kg·K). The stagnation temperature is about

A. 300 K

B. 310 K

C. 350 K

D. 305 K

View answer and explanation

Correct Option: D

T0 = T + V²/2cp = 300 + 10 000 / 2010 = 300 + 4.98 ≈ 305 K.

Q73Mechanical Engineering (SSC JE)

Medium

The excess pressure inside a soap bubble of diameter d and surface tension σ is

A. 4σ / d

B. σ / d

C. 2σ / d

D. 8σ / d

View answer and explanation

Correct Option: D

A bubble has two surfaces, so Δp = 4σ/R = 8σ/d. A liquid droplet has one surface, with Δp = 4σ/d.

Q74Mechanical Engineering (SSC JE)

Easy

The capillary rise of a liquid in a glass tube is

A. proportional to the diameter of the tube

B. inversely proportional to the diameter of the tube

C. proportional to the square of the diameter

D. independent of the diameter of the tube

View answer and explanation

Correct Option: B

h = 4σ cos θ / (ρ g d).

Q75Mechanical Engineering (SSC JE)

Medium

In fully turbulent flow through a rough pipe, the friction factor depends mainly on

A. the relative roughness of the pipe

B. the Reynolds number only

C. the Froude number

D. the Mach number

View answer and explanation

Correct Option: A

At high Re the viscous sub-layer is smaller than the roughness, so f becomes independent of Re and depends on ε/D alone.

Q76Mechanical Engineering (SSC JE)

Easy

The flow to a Pelton wheel is regulated by

A. guide vanes

B. a spear (needle) valve in the nozzle

C. a draft tube

D. adjustable runner blades

View answer and explanation

Correct Option: B

The spear moves in and out of the nozzle, which changes the jet area while the head and velocity stay the same.

Q77Mechanical Engineering (SSC JE)

Hard

A composite wall has two layers: k1 = 1 W/m·K, thickness 0.1 m, and k2 = 0.5 W/m·K, thickness 0.1 m. The temperature difference across the wall is 60 °C. The heat flux is

A. 120 W/m²

B. 200 W/m²

C. 600 W/m²

D. 300 W/m²

View answer and explanation

Correct Option: B

R = 0.1/1 + 0.1/0.5 = 0.3 m²K/W. q = ΔT/R = 60/0.3 = 200 W/m².

Q78Mechanical Engineering (SSC JE)

Hard

In a counterflow heat exchanger, hot fluid cools from 100 °C to 60 °C and cold fluid heats from 30 °C to 50 °C. The LMTD is about

A. 40.0 °C

B. 50.0 °C

C. 30.0 °C

D. 39.2 °C

View answer and explanation

Correct Option: D

ΔT1 = 100 − 50 = 50 °C and ΔT2 = 60 − 30 = 30 °C. LMTD = (50 − 30)/ln(50/30) = 20/0.511 = 39.2 °C.

Q79Mechanical Engineering (SSC JE)

Easy

A lumped capacitance analysis of transient conduction is valid when the Biot number is

A. less than 0.1

B. greater than 10

C. greater than 100

D. equal to 1

View answer and explanation

Correct Option: A

Bi = hL/k < 0.1 means that the internal resistance of the solid is small, so its temperature is nearly uniform.

Q80Mechanical Engineering (SSC JE)

Medium

In the effectiveness-NTU method of heat exchanger analysis, NTU is defined as

A. UA / Cmin

B. UA × Cmin

C. Cmin / UA

D. Cmax / Cmin

View answer and explanation

Correct Option: A

NTU is the number of transfer units, the ratio of the thermal size UA to the smaller heat capacity rate.

Q81Mechanical Engineering (SSC JE)

Easy

The Prandtl number is defined as

A. ρ V L / μ

B. μ cp / k

C. g β ΔT L³ / ν²

D. h L / k

View answer and explanation

Correct Option: B

It is the ratio of momentum diffusivity to thermal diffusivity.

Q82Mechanical Engineering (SSC JE)

Hard

According to Wien’s displacement law, the peak emission of a black body at 1449 K occurs at a wavelength of about (λmax·T = 2898 μm·K)

A. 2 μm

B. 4 μm

C. 1 μm

D. 0.5 μm

View answer and explanation

Correct Option: A

λmax = 2898 / 1449 = 2 μm.

Q83Mechanical Engineering (SSC JE)

Hard

A material has E = 200 GPa and Poisson’s ratio 0.25. The modulus of rigidity is

A. 66.7 GPa

B. 80 GPa

C. 160 GPa

D. 100 GPa

View answer and explanation

Correct Option: B

G = E / [2(1 + ν)] = 200 / 2.5 = 80 GPa.

Q84Mechanical Engineering (SSC JE)

Hard

A steel bar and a copper bar, each of area 100 mm², share a total axial load of 30 kN in parallel (Es = 200 GPa, Ec = 100 GPa). The load carried by the steel is

A. 15 kN

B. 10 kN

C. 30 kN

D. 20 kN

View answer and explanation

Correct Option: D

Both bars have the same strain, so the loads share in proportion to AE: 2 : 1. Steel takes 2/3 × 30 = 20 kN.

Q85Mechanical Engineering (SSC JE)

Medium

The maximum deflection of a simply supported beam of span L carrying a uniformly distributed load w per unit length is

A. wL⁴ / 192EI

B. 5wL⁴ / 384EI

C. wL⁴ / 8EI

D. wL³ / 48EI

View answer and explanation

Correct Option: B

The standard result for a full span UDL on a simply supported beam is 5wL⁴/384EI. The value wL⁴/8EI is for a cantilever.

Q86Mechanical Engineering (SSC JE)

Easy

Two solid shafts of the same material and length have diameters in the ratio 2 : 1. The ratio of the torques they can transmit at the same maximum shear stress is

A. 16 : 1

B. 2 : 1

C. 8 : 1

D. 4 : 1

View answer and explanation

Correct Option: C

T = π τ d³ / 16, so T ∝ d³, giving 2³ : 1 = 8 : 1.

Q87Mechanical Engineering (SSC JE)

Hard

At a point, σx = 100 MPa, σy = 0 and τxy = 50 MPa. The maximum principal stress is

A. 120.7 MPa

B. 150 MPa

C. 70.7 MPa

D. 100 MPa

View answer and explanation

Correct Option: A

σ1 = (σx + σy)/2 + √[((σx − σy)/2)² + τ²] = 50 + √(2500 + 2500) = 50 + 70.7 = 120.7 MPa.

Q88Mechanical Engineering (SSC JE)

Easy

Euler’s buckling formula is valid for

A. columns with a low slenderness ratio

B. short columns

C. long columns with a high slenderness ratio

D. columns that fail only by crushing

View answer and explanation

Correct Option: C

For short columns the Euler load would exceed the crushing load. Rankine’s or Johnson’s formulae are used for intermediate columns.

Q89Mechanical Engineering (SSC JE)

Hard

A suddenly applied load produces a stress in a bar that is

A. half the stress from the same load applied gradually

B. four times the stress from the same load applied gradually

C. equal to the stress from the same load applied gradually

D. twice the stress from the same load applied gradually

View answer and explanation

Correct Option: D

The load does work P δ, which equals the strain energy stored, ½ σ A δ. Hence σ = 2P/A.

Q90Mechanical Engineering (SSC JE)

Easy

Creep is the slow plastic deformation of a material under

A. an impact load

B. constant stress at high temperature

C. cyclic stress at room temperature

D. a decreasing stress

View answer and explanation

Correct Option: B

It becomes significant above about 0.4 times the absolute melting temperature, as in turbine blades and boiler tubes.

Q91Mechanical Engineering (SSC JE)

Hard

A rectangular beam of width 100 mm and depth 200 mm carries a bending moment of 20 kN·m. The maximum bending stress is

A. 60 MPa

B. 15 MPa

C. 3 MPa

D. 30 MPa

View answer and explanation

Correct Option: D

Z = bd²/6 = 100 × 200² / 6 = 666 667 mm³. σ = M/Z = 20 × 10⁶ / 666 667 = 30 MPa.

Q92Mechanical Engineering (SSC JE)

Hard

A solid shaft of diameter 50 mm transmits a torque of 1 kN·m. The maximum shear stress is about

A. 81.5 MPa

B. 40.7 MPa

C. 20.4 MPa

D. 163 MPa

View answer and explanation

Correct Option: B

τ = 16T / (πd³) = 16 × 10⁶ / (π × 125 000) = 40.7 MPa.

Q93Mechanical Engineering (SSC JE)

Easy

In a simple gear train, the driver has 20 teeth and rotates at 600 rpm. The driven gear has 60 teeth. The speed of the driven gear is

A. 300 rpm

B. 1800 rpm

C. 200 rpm

D. 100 rpm

View answer and explanation

Correct Option: C

N2 = N1 × (T1/T2) = 600 × 20/60 = 200 rpm.

Q94Mechanical Engineering (SSC JE)

Easy

An idler gear in a gear train

A. increases the torque

B. reduces the number of teeth

C. changes only the direction of rotation of the driven gear

D. changes the speed ratio

View answer and explanation

Correct Option: C

It does not alter the velocity ratio, as the idler’s tooth count cancels out.

Q95Mechanical Engineering (SSC JE)

Medium

Coriolis acceleration is present when

A. a link rotates about a fixed point with constant speed and no sliding

B. a link moves in pure translation

C. a point moves along a link that itself rotates

D. all links are fixed

View answer and explanation

Correct Option: C

The component is 2ωv, perpendicular to the sliding velocity, and arises in quick-return mechanisms and similar linkages.

Q96Mechanical Engineering (SSC JE)

Hard

The speed of a flywheel varies between 290 rpm and 310 rpm. The coefficient of fluctuation of speed is

A. 0.067

B. 0.033

C. 0.133

D. 0.0067

View answer and explanation

Correct Option: A

Cs = (N1 − N2) / Nmean = 20 / 300 = 0.067.

Q97Mechanical Engineering (SSC JE)

Medium

The maximum power is transmitted by a belt when the centrifugal tension is equal to

A. zero

B. half of the maximum permissible tension

C. the maximum permissible tension

D. one-third of the maximum permissible tension

View answer and explanation

Correct Option: D

From P = (T − Tc)(1 − e^(−μθ))v, dP/dv = 0 gives Tc = T/3.

Q98Mechanical Engineering (SSC JE)

Easy

A vibrating system with damping ratio ζ = 1 is called

A. undamped

B. critically damped

C. overdamped

D. underdamped

View answer and explanation

Correct Option: B

At ζ = 1 the system returns to equilibrium in the shortest time without oscillating.

Q99Mechanical Engineering (SSC JE)

Easy

The maximum primary unbalanced force of a reciprocating engine mechanism, with reciprocating mass m, crank radius r and angular speed ω, is

A. m r ω

B. m r ω² / 2

C. m r² ω

D. m r ω²

View answer and explanation

Correct Option: D

The primary force is m r ω² cos θ, whose peak occurs at θ = 0° and 180°.

Q100Mechanical Engineering (SSC JE)

Easy

A rotor of moment of inertia 0.5 kg·m² spins at 100 rad/s and is precessed at 2 rad/s. The gyroscopic couple is

A. 100 N·m

B. 200 N·m

C. 50 N·m

D. 10 N·m

View answer and explanation

Correct Option: A

C = I ω ωp = 0.5 × 100 × 2 = 100 N·m.

Q101Mechanical Engineering (SSC JE)

Medium

For a cam follower moving with uniform velocity, the acceleration at the beginning and the end of the stroke is theoretically

A. negative

B. constant

C. zero

D. infinite

View answer and explanation

Correct Option: D

The sudden jump in velocity requires an infinite acceleration, which causes impact. Modified profiles round off the ends.

Q102Mechanical Engineering (SSC JE)

Easy

The number of instantaneous centres in a mechanism with 6 links is

A. 12

B. 10

C. 15

D. 30

View answer and explanation

Correct Option: C

N = n(n − 1)/2 = 6 × 5 / 2 = 15.

Q103Mechanical Engineering (SSC JE)

Hard

A solid shaft of diameter 40 mm is made of steel with an allowable shear stress of 60 MPa. The maximum torque it can transmit is about

A. 754 N·m

B. 377 N·m

C. 1508 N·m

D. 188 N·m

View answer and explanation

Correct Option: A

T = π τ d³ / 16 = π × 60 × 40³ / 16 = 753 982 N·mm ≈ 754 N·m.

Q104Mechanical Engineering (SSC JE)

Medium

The efficiency of a riveted joint is the ratio of

A. the least of the shearing, tearing and crushing strengths to the strength of the solid plate

B. the number of rivets to the pitch

C. the rivet strength to the plate thickness

D. the strength of the solid plate to the strength of the joint

View answer and explanation

Correct Option: A

The weakest failure mode of the joint decides its strength, which is then compared with the unriveted plate.

Q105Mechanical Engineering (SSC JE)

Hard

A parallel fillet weld of size s = 8 mm has an allowable shear stress of 100 N/mm². The load per mm length is about

A. 400 N/mm

B. 800 N/mm

C. 565.6 N/mm

D. 1131 N/mm

View answer and explanation

Correct Option: C

Throat = 0.707 s = 5.656 mm. Load per mm = 5.656 × 100 = 565.6 N.

Q106Mechanical Engineering (SSC JE)

Easy

The Lewis equation is used to estimate

A. the pitch of a chain drive

B. the bending (beam) strength of a gear tooth

C. the wear strength of a gear tooth

D. the tension of a belt

View answer and explanation

Correct Option: B

It treats a gear tooth as a cantilever beam of uniform strength.

Q107Mechanical Engineering (SSC JE)

Medium

The Sommerfeld number in the design of journal bearings is

A. a dimensionless parameter involving viscosity, speed, pressure and clearance ratio

B. the number of rolling elements

C. the ratio of load to speed

D. a measure of the hardness of the bearing metal

View answer and explanation

Correct Option: A

S = (μN/p)(r/c)². It decides the bearing operating condition, such as the minimum film thickness.

Q108Mechanical Engineering (SSC JE)

Easy

Two springs of stiffness 100 N/mm each are connected in series. The equivalent stiffness is

A. 25 N/mm

B. 50 N/mm

C. 100 N/mm

D. 200 N/mm

View answer and explanation

Correct Option: B

1/k = 1/100 + 1/100 = 1/50, so k = 50 N/mm. In parallel it would be 200 N/mm.

Q109Mechanical Engineering (SSC JE)

Hard

Among the fatigue failure criteria, the Soderberg line

A. ignores the mean stress

B. uses the ultimate strength and is the least conservative

C. uses the yield strength and is the most conservative

D. ignores the alternating stress

View answer and explanation

Correct Option: C

The Soderberg line joins the endurance limit and the yield strength, so it lies below the Goodman and Gerber lines.

Q110Mechanical Engineering (SSC JE)

Easy

A cotter joint is used to connect two rods which are subjected to

A. bending only

B. axial tension or compression

C. a rotating bending load

D. torsion only

View answer and explanation

Correct Option: B

The tapered cotter is driven through slots in the rod ends, so the joint can be assembled and dismantled easily.

Q111Mechanical Engineering (SSC JE)

Hard

A single cylinder four-stroke engine has a bore of 100 mm, stroke of 150 mm, mean effective pressure of 6 bar and runs at 1200 rpm. The indicated power is about

A. 70.7 kW

B. 3.5 kW

C. 14.1 kW

D. 7.07 kW

View answer and explanation

Correct Option: D

A = π × 0.1²/4 = 0.007854 m². Work per cycle = 6 × 10⁵ × 0.007854 × 0.15 = 707 J. Cycles per second = 600/60 = 10. IP = 7.07 kW.

Q112Mechanical Engineering (SSC JE)

Easy

An engine has a brake power of 6 kW and an indicated power of 7.5 kW. Its mechanical efficiency is

A. 80 percent

B. 125 percent

C. 75 percent

D. 90 percent

View answer and explanation

Correct Option: A

ηm = BP/IP = 6/7.5 = 0.8.

Q113Mechanical Engineering (SSC JE)

Medium

The volumetric efficiency of an engine is the ratio of

A. the indicated power to the brake power

B. the swept volume to the clearance volume

C. the air-fuel ratio to the stoichiometric ratio

D. the actual volume of air drawn in to the swept volume (at intake conditions)

View answer and explanation

Correct Option: D

It shows how well the engine breathes. It falls with throttling, high intake temperature and restricted valves.

Q114Mechanical Engineering (SSC JE)

Easy

The specific fuel consumption of an engine is usually expressed in

A. kJ per kg

B. kW per kg

C. litres per hour only

D. kg per kWh

View answer and explanation

Correct Option: D

It is the mass of fuel used per unit of power per hour. A lower value means better fuel economy.

Q115Mechanical Engineering (SSC JE)

Medium

Knocking in a compression ignition engine is mainly caused by

A. a long ignition delay that lets a large quantity of fuel accumulate before ignition

B. self-ignition of the end gas

C. a lean air-fuel mixture

D. low compression ratio only

View answer and explanation

Correct Option: A

A long delay lets much fuel burn in a sudden uncontrolled phase. In SI engines, knock is auto-ignition of the end gas.

Q116Mechanical Engineering (SSC JE)

Easy

Supercharging an engine increases its power output mainly by

A. increasing the density of the air entering the cylinder

B. cooling the cylinder walls

C. reducing the compression ratio

D. reducing the speed of the engine

View answer and explanation

Correct Option: A

More air by mass allows more fuel to be burnt in the same swept volume.

Q117Mechanical Engineering (SSC JE)

Hard

In a vapour compression cycle, the enthalpies at the evaporator exit, compressor exit and condenser exit are 400, 450 and 250 kJ/kg respectively. The COP is

A. 3

B. 9

C. 4

D. 2

View answer and explanation

Correct Option: A

RE = 400 − 250 = 150 kJ/kg. W = 450 − 400 = 50 kJ/kg. COP = 150/50 = 3.

Q118Mechanical Engineering (SSC JE)

Easy

A room has a sensible heat load of 3 kW and a latent heat load of 1 kW. The sensible heat factor is

A. 0.75

B. 3

C. 0.25

D. 0.33

View answer and explanation

Correct Option: A

SHF = sensible / (sensible + latent) = 3 / 4 = 0.75.

Q119Mechanical Engineering (SSC JE)

Hard

Air at a total pressure of 101.3 kPa has a water vapour partial pressure of 2 kPa. The humidity ratio is about

A. 0.125 kg/kg of dry air

B. 0.00125 kg/kg of dry air

C. 0.0125 kg/kg of dry air

D. 0.0248 kg/kg of dry air

View answer and explanation

Correct Option: C

ω = 0.622 pv / (p − pv) = 0.622 × 2 / 99.3 = 0.0125.

Q120Mechanical Engineering (SSC JE)

Easy

Water enters a cooling tower at 40 °C and leaves at 32 °C. The ambient wet bulb temperature is 28 °C. The approach of the tower is

A. 8 °C

B. 4 °C

C. 28 °C

D. 12 °C

View answer and explanation

Correct Option: B

Approach = cold water temperature − wet bulb temperature = 32 − 28 = 4 °C. The range is 8 °C.

Q121Mechanical Engineering (SSC JE)

Easy

Which of the following refrigerants has zero ozone depletion potential?

A. R-12

B. R-22

C. R-134a

D. R-11

View answer and explanation

Correct Option: C

R-134a contains no chlorine. R-12 and R-11 are CFCs and R-22 is an HCFC, all of which harm the ozone layer.

Q122Mechanical Engineering (SSC JE)

Easy

In a domestic refrigerator, the expansion device is usually

A. a float valve

B. a turbine

C. a thermostatic expansion valve

D. a capillary tube

View answer and explanation

Correct Option: D

A long narrow tube drops the pressure of the refrigerant by friction. It has no moving parts and suits small hermetic units.

Q123Mechanical Engineering (SSC JE)

Hard

In a Rankine cycle, the turbine work is 900 kJ/kg, the pump work is 20 kJ/kg and the heat added is 2200 kJ/kg. The cycle efficiency is

A. 36 percent

B. 40.9 percent

C. 44 percent

D. 40 percent

View answer and explanation

Correct Option: D

η = (900 − 20) / 2200 = 880/2200 = 0.40.

Q124Mechanical Engineering (SSC JE)

Hard

A boiler produces 8 kg of steam per kg of coal. The heat added per kg of steam is 2400 kJ and the calorific value of coal is 30 000 kJ/kg. The boiler efficiency is

A. 80 percent

B. 72 percent

C. 64 percent

D. 37.5 percent

View answer and explanation

Correct Option: C

η = (8 × 2400)/30 000 = 19 200/30 000 = 0.64.

Q125Mechanical Engineering (SSC JE)

Hard

The critical pressure ratio for the flow of superheated steam through a nozzle is about

A. 0.577

B. 0.9

C. 0.546

D. 0.528

View answer and explanation

Correct Option: C

It is (2/(n+1))^(n/(n−1)) with n = 1.3, giving 0.546. For dry saturated steam (n = 1.135) it is 0.577 and for air it is 0.528.

Q126Mechanical Engineering (SSC JE)

Easy

The degree of reaction of a Parsons turbine is

A. 100 percent

B. 0 percent

C. 25 percent

D. 50 percent

View answer and explanation

Correct Option: D

The fixed and moving blades are identical, so the pressure drop is shared equally.

Q127Mechanical Engineering (SSC JE)

Easy

A power plant has an average load of 40 MW and a peak load of 80 MW. The load factor is

A. 0.4

B. 0.8

C. 2

D. 0.5

View answer and explanation

Correct Option: D

Load factor = average load / peak load = 40/80 = 0.5.

Q128Mechanical Engineering (SSC JE)

Medium

Regenerative feed water heating in a steam plant improves the cycle efficiency by

A. removing the need for a boiler

B. raising the mean temperature at which heat is added

C. lowering the condenser pressure

D. increasing the turbine speed

View answer and explanation

Correct Option: B

Bled steam preheats the feed water, so less heat has to be added at low temperatures.

Q129Mechanical Engineering (SSC JE)

Easy

The energy released per fission of a U-235 nucleus is about

A. 2000 MeV

B. 20 MeV

C. 200 MeV

D. 2 MeV

View answer and explanation

Correct Option: C

Most of the 200 MeV appears as kinetic energy of the fission fragments, which becomes heat.

Q130Mechanical Engineering (SSC JE)

Easy

A back pressure steam turbine is used where

A. the exhaust steam is needed for process heating

B. only dry saturated steam is available

C. a vacuum condenser is available

D. the maximum power is needed from the steam

View answer and explanation

Correct Option: A

Exhausting at a higher pressure gives less power, but the heat in the exhaust is useful in cogeneration plants.

Q131Mechanical Engineering (SSC JE)

Medium

According to Chvorinov’s rule, the solidification time of a casting is proportional to

A. the cube of the volume

B. the volume to surface area ratio

C. the surface area to volume ratio

D. the square of the volume to surface area ratio

View answer and explanation

Correct Option: D

t = B (V/A)². Risers are given a larger V/A than the casting to freeze last.

Q132Mechanical Engineering (SSC JE)

Easy

The flux coating on a welding electrode is provided mainly to

A. increase the electrical resistance of the electrode

B. shield the weld pool from oxidation and stabilise the arc

C. increase the weight of the electrode

D. cool the weld rapidly

View answer and explanation

Correct Option: B

The coating burns to form a gas shield and a slag blanket that protect the molten metal from the atmosphere.

Q133Mechanical Engineering (SSC JE)

Hard

In orthogonal cutting with a zero rake angle, the chip thickness ratio is 0.5. The shear angle is about

A. 45°

B. 26.6°

C. 63.4°

D. 30°

View answer and explanation

Correct Option: B

tan φ = r cos α / (1 − r sin α) = 0.5 / 1 = 0.5, so φ = 26.6°.

Q134Mechanical Engineering (SSC JE)

Hard

In a turning operation, the cutting force is 500 N and the cutting speed is 120 m/min. The power consumed in cutting is

A. 1 kW

B. 60 kW

C. 0.5 kW

D. 2 kW

View answer and explanation

Correct Option: A

V = 120/60 = 2 m/s. P = Fc V = 500 × 2 = 1000 W = 1 kW.

Q135Mechanical Engineering (SSC JE)

Hard

A hole is drilled through a total travel of 30 mm (including approach and overrun) with a feed of 0.2 mm/rev at 300 rpm. The drilling time is

A. 0.2 min

B. 2.0 min

C. 1.0 min

D. 0.5 min

View answer and explanation

Correct Option: D

t = L / (f N) = 30 / (0.2 × 300) = 0.5 min.

Q136Mechanical Engineering (SSC JE)

Easy

In a grinding wheel designation, the letter A stands for

A. aluminium oxide abrasive

B. diamond abrasive

C. silicon carbide abrasive

D. cubic boron nitride abrasive

View answer and explanation

Correct Option: A

A is aluminium oxide (for steels) and C is silicon carbide (for cast iron and non-ferrous metals).

Q137Mechanical Engineering (SSC JE)

Easy

In electrical discharge machining (EDM), material is removed by

A. repeated spark erosion of a conductive workpiece immersed in a dielectric

B. a high pressure water jet

C. chemical dissolution in an acid

D. a laser beam

View answer and explanation

Correct Option: A

Each spark melts and vaporises a tiny crater, so the process works on any conductive material regardless of hardness.

Q138Mechanical Engineering (SSC JE)

Easy

In CNC part programming, the code G01 denotes

A. circular interpolation clockwise

B. linear interpolation at a programmed feed rate

C. tool change

D. rapid positioning

View answer and explanation

Correct Option: B

G00 is rapid traverse, G01 is linear cutting move, and G02/G03 are circular interpolation.

Q139Mechanical Engineering (SSC JE)

Easy

Springback in a sheet metal bending operation is

A. the cracking of the outer surface

B. the thinning of the sheet

C. the increase of the hardness

D. the elastic recovery of the part after the bending load is removed

View answer and explanation

Correct Option: D

The part opens slightly, so tooling over-bends it by the expected springback.

Q140Mechanical Engineering (SSC JE)

Medium

Wrinkling in the flange of a deep drawn cup is caused by

A. high temperature

B. compressive circumferential stress in the flange

C. too much lubricant

D. tensile radial stress in the wall

View answer and explanation

Correct Option: B

The material drawn into the die is compressed circumferentially and buckles unless held with sufficient blank holder force.

Q141Mechanical Engineering (SSC JE)

Easy

Injection moulding is mainly used for shaping

A. thermoplastics

B. wood products

C. ceramics only

D. steel castings

View answer and explanation

Correct Option: A

Melted plastic is forced into a closed mould, cools and is ejected. Thermosets are usually compression moulded.

Q142Mechanical Engineering (SSC JE)

Easy

In the 3-2-1 principle of locating a workpiece in a fixture, the number of locating points on the primary face is

A. 1

B. 2

C. 6

D. 3

View answer and explanation

Correct Option: D

Three points on the base restrict three degrees of freedom, two on a side restrict two, and one on an end restrict the last.

Q143Mechanical Engineering (SSC JE)

Easy

A block of mass 20 kg rests on a horizontal floor with μ = 0.3 (g = 9.81 m/s²). The friction force that must be overcome to start the block sliding is

A. 58.9 N

B. 196.2 N

C. 588.6 N

D. 6.0 N

View answer and explanation

Correct Option: A

F = μ m g = 0.3 × 20 × 9.81 = 58.9 N.

Q144Mechanical Engineering (SSC JE)

Easy

A ball of mass 0.5 kg moving at 10 m/s bounces back with the same speed from a wall. The magnitude of the impulse is

A. 10 N·s

B. 20 N·s

C. 5 N·s

D. 0 N·s

View answer and explanation

Correct Option: A

Impulse = change in momentum = 0.5 × 10 − (−0.5 × 10) = 10 N·s.

Q145Mechanical Engineering (SSC JE)

Easy

The moment of inertia of a uniform solid disc of mass m and radius r about an axis through its centre and perpendicular to its plane is

A. ¼ m r²

B. ½ m r²

C. ⅔ m r²

D. m r²

View answer and explanation

Correct Option: B

I = ½ m r² for a solid disc, m r² for a thin ring and ⅖ m r² for a solid sphere.

Q146Mechanical Engineering (SSC JE)

Hard

A mass of 1 kg is attached to a spring of stiffness 100 N/m. The time period of vibration is about

A. 0.0628 s

B. 0.628 s

C. 1.0 s

D. 6.28 s

View answer and explanation

Correct Option: B

T = 2π √(m/k) = 2π √(1/100) = 0.628 s.

Q147Mechanical Engineering (SSC JE)

Hard

A product has a fixed cost of ₹2,00,000, a selling price of ₹50 per unit and a variable cost of ₹30 per unit. The break-even quantity is

A. 4 000 units

B. 6 667 units

C. 10 000 units

D. 25 000 units

View answer and explanation

Correct Option: C

BEP = fixed cost / (price − variable cost) = 2,00,000 / 20 = 10 000 units.

Q148Mechanical Engineering (SSC JE)

Easy

Which of the following is a thermosetting plastic?

A. PVC

B. Nylon

C. Bakelite

D. Polythene

View answer and explanation

Correct Option: C

Thermosets cure with heat into a rigid cross-linked network and cannot be remelted. Nylon, PVC and polythene are thermoplastics.

Q149Mechanical Engineering (SSC JE)

Easy

Slip gauges are used

A. to measure surface roughness

B. to measure angles only

C. for checking the hardness of a part

D. as standards of length for calibration and precision setting

View answer and explanation

Correct Option: D

They are rectangular steel or ceramic blocks of accurately known thickness that can be wrung together to build a required length.

Q150Mechanical Engineering (SSC JE)

Easy

In statistical quality control, a p-chart is used to monitor

A. the range of a measured dimension

B. the number of defects per unit

C. the fraction of defective items in a sample

D. the mean of a measured dimension

View answer and explanation

Correct Option: C

It is an attribute chart. X-bar and R charts are used for measurable (variable) characteristics.

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