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RRB JE CBT 2 Electrical 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)Electrical 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.

Q51Electrical Engineering (SSC JE)

Easy

A 6 Ω and a 3 Ω resistor in parallel are connected in series with a 4 Ω resistor across a 12 V supply. The current drawn from the supply is

A. 3 A

B. 1 A

C. 4 A

D. 2 A

View answer and explanation

Correct Option: D

6 Ω ∥ 3 Ω = 2 Ω. Total = 2 + 4 = 6 Ω. I = 12/6 = 2 A.

Q52Electrical Engineering (SSC JE)

Easy

Resistors of 20 kΩ and 30 kΩ are connected in series across a 100 V supply. The voltage across the 30 kΩ resistor is

A. 50 V

B. 40 V

C. 75 V

D. 60 V

View answer and explanation

Correct Option: D

V = 100 × 30 / (20 + 30) = 60 V.

Q53Electrical Engineering (SSC JE)

Easy

A 2 kW heater runs for 3 hours every day for 30 days. At ₹6 per unit, the monthly cost of the energy is

A. ₹540

B. ₹180

C. ₹1,080

D. ₹2,160

View answer and explanation

Correct Option: C

Energy = 2 × 3 × 30 = 180 kWh. Cost = 180 × 6 = ₹1,080.

Q54Electrical Engineering (SSC JE)

Hard

A battery of emf 12 V and internal resistance 0.5 Ω supplies a 5.5 Ω load. The terminal voltage is

A. 11.5 V

B. 11 V

C. 10.5 V

D. 12 V

View answer and explanation

Correct Option: B

I = 12/(0.5 + 5.5) = 2 A. Terminal voltage = 12 − 2 × 0.5 = 11 V.

Q55Electrical Engineering (SSC JE)

Easy

Capacitors of 6 μF and 3 μF are connected in series. The equivalent capacitance is

A. 18 μF

B. 2 μF

C. 4.5 μF

D. 9 μF

View answer and explanation

Correct Option: B

C = (6 × 3)/(6 + 3) = 2 μF.

Q56Electrical Engineering (SSC JE)

Easy

If the distance between the plates of a parallel plate capacitor is doubled, keeping everything else the same, the capacitance

A. becomes half

B. remains the same

C. becomes four times

D. doubles

View answer and explanation

Correct Option: A

C = εA/d, so C is inversely proportional to the plate separation d.

Q57Electrical Engineering (SSC JE)

Hard

A resistor has a resistance of 10 Ω at 20 °C and a temperature coefficient of 0.004 per °C at 20 °C. Its resistance at 70 °C is

A. 12 Ω

B. 14 Ω

C. 10.2 Ω

D. 13 Ω

View answer and explanation

Correct Option: A

Rt = R0 [1 + α (T − T0)] = 10 × [1 + 0.004 × 50] = 12 Ω.

Q58Electrical Engineering (SSC JE)

Hard

A current of 5 A flows for 2 minutes through a 10 Ω resistor. The heat produced is

A. 3 kJ

B. 30 kJ

C. 600 J

D. 300 kJ

View answer and explanation

Correct Option: B

H = I²Rt = 25 × 10 × 120 = 30 000 J.

Q59Electrical Engineering (SSC JE)

Medium

The resistivity of annealed copper at 20 °C is about

A. 1.7 × 10⁻¹¹ Ω·m

B. 1.7 × 10⁻² Ω·m

C. 1.7 × 10⁻⁵ Ω·m

D. 1.7 × 10⁻⁸ Ω·m

View answer and explanation

Correct Option: D

Copper has one of the lowest resistivities among common metals (silver is slightly lower).

Q60Electrical Engineering (SSC JE)

Medium

The maximum permissible operating temperature of Class A insulation is

A. 105 °C

B. 155 °C

C. 180 °C

D. 130 °C

View answer and explanation

Correct Option: A

Class A (cotton, silk, paper impregnated) is 105 °C, Class B 130 °C, Class F 155 °C and Class H 180 °C.

Q61Electrical Engineering (SSC JE)

Medium

The specific gravity of the electrolyte in a fully charged lead-acid cell is about

A. 1.8

B. 1.5

C. 1.2 to 1.28

D. 1.0

View answer and explanation

Correct Option: C

It falls toward 1.1 as the cell discharges, because sulphuric acid is used up and water forms. This is why a hydrometer shows the state of charge.

Q62Electrical Engineering (SSC JE)

Medium

In a network with b branches and n nodes, the number of independent KVL (loop) equations is

A. n − 1

B. b + n − 1

C. b − n

D. b − n + 1

View answer and explanation

Correct Option: D

There are n − 1 independent KCL equations and b − (n − 1) = b − n + 1 independent loop equations.

Q63Electrical Engineering (SSC JE)

Hard

A series circuit with R = 30 Ω, XL = 70 Ω and XC = 30 Ω is connected to a 100 V ac supply. The current is

A. 1 A

B. 10 A

C. 3.3 A

D. 2 A

View answer and explanation

Correct Option: D

X = 70 − 30 = 40 Ω. |Z| = √(30² + 40²) = 50 Ω. I = 100/50 = 2 A.

Q64Electrical Engineering (SSC JE)

Hard

A load has V = 200∠0° V and I = 10∠−30° A. The reactive power is

A. 500 VAr

B. 2000 VAr

C. 1000 VAr

D. 1732 VAr

View answer and explanation

Correct Option: C

Q = V I sin φ = 200 × 10 × sin 30° = 1000 VAr. The real power is 200 × 10 × cos 30° = 1732 W.

Q65Electrical Engineering (SSC JE)

Hard

A parallel resonant circuit has L = 1 mH, C = 1 μF and a coil resistance of 10 Ω. The dynamic impedance at resonance is

A. 10 Ω

B. 31.6 Ω

C. 100 Ω

D. 1000 Ω

View answer and explanation

Correct Option: C

Zd = L / (C R) = 10⁻³ / (10⁻⁶ × 10) = 100 Ω.

Q66Electrical Engineering (SSC JE)

Easy

In a series RC circuit being charged from a dc supply, the capacitor voltage reaches what fraction of the final value after one time constant?

A. 50 percent

B. 63.2 percent

C. 36.8 percent

D. 86.5 percent

View answer and explanation

Correct Option: B

v(t) = V (1 − e^(−t/τ)). At t = τ this is V (1 − 0.368) = 0.632 V.

Q67Electrical Engineering (SSC JE)

Medium

For a reciprocal two-port network, the ABCD parameters satisfy

A. AD − BC = 0

B. AD − BC = 1

C. AD + BC = 1

D. AD = BC

View answer and explanation

Correct Option: B

Reciprocity requires the determinant of the transmission matrix to be one.

Q68Electrical Engineering (SSC JE)

Hard

A series RLC circuit has R = 10 Ω, L = 1 mH and C = 1 μF. The quality factor is about

A. 31.6

B. 0.316

C. 3.16

D. 316

View answer and explanation

Correct Option: C

Q = (1/R) √(L/C) = (1/10) × √(10⁻³/10⁻⁶) = 31.62/10 = 3.16.

Q69Electrical Engineering (SSC JE)

Easy

In a balanced three-phase four-wire system, the current in the neutral wire is

A. zero

B. √3 times the line current

C. three times the line current

D. equal to the line current

View answer and explanation

Correct Option: A

The three phase currents are equal in magnitude and 120° apart, so their phasor sum is zero.

Q70Electrical Engineering (SSC JE)

Easy

A balanced delta-connected load has a phase current of 10 A. The line current is

A. 17.3 A

B. 30 A

C. 10 A

D. 5.77 A

View answer and explanation

Correct Option: A

In delta IL = √3 Iph = 1.732 × 10 = 17.3 A.

Q71Electrical Engineering (SSC JE)

Hard

In a two-wattmeter test on a balanced load, the readings are 3 kW and 1 kW (both positive). The power factor is about

A. 0.5

B. 0.756

C. 0.6

D. 0.866

View answer and explanation

Correct Option: B

tan φ = √3 (W1 − W2)/(W1 + W2) = 1.732 × 2/4 = 0.866, so φ = 40.9° and cos φ = 0.756.

Q72Electrical Engineering (SSC JE)

Hard

Two coils with L1 = 1 H, L2 = 2 H and mutual inductance M = 0.5 H are connected in series aiding. The total inductance is

A. 4 H

B. 3 H

C. 2 H

D. 3.5 H

View answer and explanation

Correct Option: A

Ltotal = L1 + L2 + 2M = 1 + 2 + 1 = 4 H. In series opposing it would be 2 H.

Q73Electrical Engineering (SSC JE)

Medium

For maximum power transfer in an ac circuit with a complex source impedance Zs, the load impedance should be

A. the complex conjugate of Zs

B. zero

C. the reciprocal of Zs

D. equal to Zs

View answer and explanation

Correct Option: A

This cancels the reactance and makes the load resistance equal to the source resistance.

Q74Electrical Engineering (SSC JE)

Easy

A 12 V source in series with a 4 Ω resistor is converted to its Norton equivalent. The Norton current is

A. 0.33 A

B. 3 A

C. 12 A

D. 48 A

View answer and explanation

Correct Option: B

IN = VTh / RTh = 12/4 = 3 A, with the 4 Ω in parallel.

Q75Electrical Engineering (SSC JE)

Medium

Millman’s theorem is used to find

A. the maximum power transferred

B. the current in a series circuit

C. the phase angle of a load

D. the voltage at the common node of parallel branches containing sources and resistances

View answer and explanation

Correct Option: D

V = Σ(Vk/Rk) / Σ(1/Rk) reduces several parallel branches to a single equivalent source.

Q76Electrical Engineering (SSC JE)

Hard

The peak value of a full-wave rectified sine wave is 157 V. Its average value is about

A. 100 V

B. 50 V

C. 111 V

D. 157 V

View answer and explanation

Correct Option: A

Vavg = 2Vm/π = 2 × 157/3.1416 = 99.95 ≈ 100 V.

Q77Electrical Engineering (SSC JE)

Hard

A coil of 200 turns is wound on a core whose reluctance is 4 × 10⁵ AT/Wb. Its self-inductance is

A. 1.0 H

B. 0.2 H

C. 0.01 H

D. 0.1 H

View answer and explanation

Correct Option: D

L = N²/S = 200² / (4 × 10⁵) = 40 000 / 400 000 = 0.1 H.

Q78Electrical Engineering (SSC JE)

Easy

A conductor 0.4 m long carries 10 A at right angles to a field of 0.5 T. The force on it is

A. 5 N

B. 2 N

C. 0.2 N

D. 20 N

View answer and explanation

Correct Option: B

F = B I L = 0.5 × 10 × 0.4 = 2 N.

Q79Electrical Engineering (SSC JE)

Easy

The energy lost per cycle per unit volume due to hysteresis is equal to

A. the coercive force

B. the area of the B-H loop

C. the peak value of B

D. the residual flux density

View answer and explanation

Correct Option: B

The area of the loop (in J/m³) is the energy dissipated as the material is taken once through the cycle.

Q80Electrical Engineering (SSC JE)

Easy

The eddy current loss in a core varies as

A. the cube of the lamination thickness

B. the inverse of the lamination thickness

C. the lamination thickness

D. the square of the lamination thickness

View answer and explanation

Correct Option: D

Pe ∝ f² Bm² t². Thin laminations are used to reduce this loss.

Q81Electrical Engineering (SSC JE)

Hard

A DC shunt generator delivers 40 A at 220 V. The field current is 2 A and the armature resistance is 0.1 Ω. The generated emf is

A. 216 V

B. 224.2 V

C. 228 V

D. 220 V

View answer and explanation

Correct Option: B

Ia = 40 + 2 = 42 A. E = V + Ia Ra = 220 + 42 × 0.1 = 224.2 V.

Q82Electrical Engineering (SSC JE)

Hard

A DC motor delivers 10 kW at 1000 rpm. The shaft torque is about

A. 10 N·m

B. 9.55 N·m

C. 95.5 N·m

D. 955 N·m

View answer and explanation

Correct Option: C

T = P / ω = 10 000 × 60 / (2π × 1000) = 95.5 N·m.

Q83Electrical Engineering (SSC JE)

Hard

A DC shunt motor on a 220 V supply with Ra = 0.4 Ω runs at 1000 rpm taking 25 A. When the armature current rises to 50 A with the same flux, the speed becomes about

A. 952 rpm

B. 905 rpm

C. 1000 rpm

D. 1050 rpm

View answer and explanation

Correct Option: A

Eb1 = 220 − 10 = 210 V and Eb2 = 220 − 20 = 200 V. N2 = 1000 × 200/210 = 952 rpm.

Q84Electrical Engineering (SSC JE)

Easy

Swinburne’s test cannot be used for

A. a DC shunt generator

B. a DC series motor

C. a DC shunt motor

D. a separately excited DC motor

View answer and explanation

Correct Option: B

The test needs the machine to run at no load with a constant flux. A series motor would race at no load.

Q85Electrical Engineering (SSC JE)

Hard

The secondary voltage of a transformer falls from 240 V at no load to 230 V at full load. The percentage regulation is about

A. 4.35 percent

B. 10 percent

C. 2.2 percent

D. 4.17 percent

View answer and explanation

Correct Option: D

Regulation of a transformer is taken with respect to the no-load voltage: (240 − 230)/240 = 4.17 percent.

Q86Electrical Engineering (SSC JE)

Hard

A 100 kVA transformer has an iron loss of 1 kW and a full-load copper loss of 1.5 kW. Its efficiency at full load and unity power factor is about

A. 97.0 percent

B. 98.5 percent

C. 96.2 percent

D. 97.6 percent

View answer and explanation

Correct Option: D

Output = 100 kW. Losses = 2.5 kW. η = 100 / 102.5 = 0.9756.

Q87Electrical Engineering (SSC JE)

Hard

For the transformer of 1 kW iron loss and 1.5 kW full-load copper loss, the maximum efficiency occurs at a load of about

A. 75 percent of full load

B. 100 percent of full load

C. 66.7 percent of full load

D. 81.6 percent of full load

View answer and explanation

Correct Option: D

x = √(Pi / Pcu,fl) = √(1/1.5) = 0.816.

Q88Electrical Engineering (SSC JE)

Medium

For the parallel operation of two three-phase transformers, it is essential that they have

A. the same phase sequence and zero relative phase displacement

B. the same kVA rating

C. the same cooling system

D. the same number of tappings

View answer and explanation

Correct Option: A

Without matching phase displacement, a large circulating current would flow between them even at no load.

Q89Electrical Engineering (SSC JE)

Medium

The phase displacement between the primary and secondary line voltages of a Dyn11 transformer is

A. 120°

B. 30°

C. 60°

D. 0°

View answer and explanation

Correct Option: B

In the vector group Dyn11 the low voltage side leads the high voltage side by 30° (11 o’clock).

Q90Electrical Engineering (SSC JE)

Medium

In an induction motor, the slip at which the maximum torque occurs is equal to

A. X2 / R2

B. R2 × X2

C. R2 / X2

D. R2 + X2

View answer and explanation

Correct Option: C

sm = R2/X2, where R2 is the rotor resistance and X2 the standstill rotor reactance. The value of the maximum torque is independent of R2.

Q91Electrical Engineering (SSC JE)

Easy

The input to the rotor of an induction motor is 10 kW and the slip is 0.04. The rotor copper loss is

A. 0.04 kW

B. 0.4 kW

C. 9.6 kW

D. 4 kW

View answer and explanation

Correct Option: B

Rotor copper loss = s × rotor input = 0.04 × 10 = 0.4 kW. The mechanical power developed is 9.6 kW.

Q92Electrical Engineering (SSC JE)

Easy

The starting torque of a slip-ring induction motor can be improved by

A. removing the slip rings

B. adding external resistance in the rotor circuit

C. reducing the supply voltage

D. increasing the supply frequency

View answer and explanation

Correct Option: B

The extra resistance raises the rotor power factor at standstill and, within limits, the starting torque. It is cut out as the motor speeds up.

Q93Electrical Engineering (SSC JE)

Easy

A 50 Hz alternator running at 300 rpm has how many poles?

A. 24

B. 40

C. 10

D. 20

View answer and explanation

Correct Option: D

P = 120 f / Ns = 120 × 50 / 300 = 20.

Q94Electrical Engineering (SSC JE)

Medium

In the V-curve of a synchronous motor (armature current against field current), the armature current is minimum at

A. 0.5 power factor lagging

B. zero power factor leading

C. unity power factor

D. zero power factor lagging

View answer and explanation

Correct Option: C

To the left of the minimum the motor is under-excited (lagging) and to the right over-excited (leading).

Q95Electrical Engineering (SSC JE)

Medium

Damper windings in a synchronous machine are provided to

A. prevent hunting and provide starting torque for motors

B. reduce the stator copper loss

C. raise the efficiency at light loads

D. increase the field flux

View answer and explanation

Correct Option: A

The bars carry induced currents that oppose any oscillation of the rotor about synchronous speed.

Q96Electrical Engineering (SSC JE)

Easy

Among single-phase induction motors, the one with the highest starting torque is the

A. capacitor-start motor

B. reluctance motor

C. resistance split-phase motor

D. shaded-pole motor

View answer and explanation

Correct Option: A

A large capacitor in the starting winding gives a phase shift of nearly 90°, producing starting torque of around 3 to 4 times the full-load value.

Q97Electrical Engineering (SSC JE)

Easy

A stepper motor has 200 steps per revolution. Its step angle is

A. 1.8°

B. 0.9°

C. 18°

D. 3.6°

View answer and explanation

Correct Option: A

Step angle = 360°/200 = 1.8°.

Q98Electrical Engineering (SSC JE)

Medium

Because of armature reaction in a DC generator, the magnetic neutral axis shifts

A. in the direction of rotation

B. by exactly 90° electrical

C. against the direction of rotation

D. not at all

View answer and explanation

Correct Option: A

In a generator the brushes must be moved forward (in the direction of rotation) to the new neutral position. In a motor they move backward.

Q99Electrical Engineering (SSC JE)

Medium

The ABCD constants of a short transmission line with series impedance Z are

A. A = 1, B = 0, C = Z, D = 1

B. A = D = 1, B = Z, C = 0

C. A = D = Z, B = C = 1

D. A = D = 0, B = 1, C = Z

View answer and explanation

Correct Option: B

With negligible shunt admittance, Vs = Vr + Z Ir and Is = Ir.

Q100Electrical Engineering (SSC JE)

Medium

The Ferranti effect refers to

A. the rise of receiving end voltage above the sending end voltage on a lightly loaded long line

B. the loss of power by corona

C. the unequal current distribution in a conductor

D. the fall of receiving end voltage under heavy loads

View answer and explanation

Correct Option: A

The charging current of the line capacitance flows through the line inductance and raises the voltage at the open end.

Q101Electrical Engineering (SSC JE)

Hard

A line has an inductance of 1.2 mH/km and a capacitance of 0.012 μF/km. The surge impedance is about

A. 1000 Ω

B. 316 Ω

C. 31.6 Ω

D. 100 Ω

View answer and explanation

Correct Option: B

Zc = √(L/C) = √(1.2 × 10⁻³ / 1.2 × 10⁻⁸) = √10⁵ = 316 Ω.

Q102Electrical Engineering (SSC JE)

Hard

A bus has a Thevenin reactance of 0.2 pu on a 100 MVA base. The short-circuit level at that bus is

A. 500 MVA

B. 100 MVA

C. 200 MVA

D. 20 MVA

View answer and explanation

Correct Option: A

Short-circuit MVA = base MVA / X pu = 100/0.2 = 500 MVA.

Q103Electrical Engineering (SSC JE)

Easy

In a balanced three-phase short circuit, the fault current is determined by

A. the zero sequence network only

B. the positive sequence network only

C. the negative sequence network only

D. all three sequence networks in series

View answer and explanation

Correct Option: B

A symmetrical fault has no negative or zero sequence components.

Q104Electrical Engineering (SSC JE)

Medium

The making current of a circuit breaker is related to its symmetrical breaking current by

A. approximately 0.5 times

B. equal to it

C. approximately 10 times

D. approximately 2.55 times

View answer and explanation

Correct Option: D

The peak of the first cycle of the asymmetrical fault current is about 2.55 times the rms symmetrical value, and the breaker must close on it without damage.

Q105Electrical Engineering (SSC JE)

Hard

An overcurrent relay has a plug setting of 125 percent on a 5 A coil and is fed from a 400/5 A CT. For a primary fault current of 2000 A, the plug setting multiplier is

A. 3.2

B. 8

C. 4

D. 5

View answer and explanation

Correct Option: C

CT ratio = 80, so the relay current = 2000/80 = 25 A. Pick-up = 1.25 × 5 = 6.25 A. PSM = 25/6.25 = 4.

Q106Electrical Engineering (SSC JE)

Medium

A major advantage of HVDC transmission over long distances is that it

A. has no reactive power loss and no skin effect

B. uses simple, low-cost terminal equipment

C. needs no converter stations

D. needs a larger right-of-way than ac

View answer and explanation

Correct Option: A

DC lines have no charging current, no stability limit from the line angle and carry power on fewer conductors. The converter stations are the main cost.

Q107Electrical Engineering (SSC JE)

Hard

A travelling wave on a line has a reflection coefficient at an open-circuited end of

A. −1

B. 2

C. 0

D. +1

View answer and explanation

Correct Option: D

The current reflects with opposite sign and the voltage doubles, so the voltage reflection coefficient is +1. At a short-circuited end it is −1.

Q108Electrical Engineering (SSC JE)

Medium

A Petersen coil is used to

A. neutralise the capacitive earth fault current

B. improve the power factor

C. protect against lightning

D. increase the fault current

View answer and explanation

Correct Option: A

It is a tuned reactor between the system neutral and earth. At resonance, it cancels the capacitive current at the fault, which extinguishes the arc.

Q109Electrical Engineering (SSC JE)

Hard

A two-part tariff has a charge of ₹200 per kW of maximum demand and ₹5 per kWh. A consumer with a maximum demand of 10 kW uses 2000 kWh in a month. The monthly bill (taking the demand charge per month) is

A. ₹12,000

B. ₹10,000

C. ₹12,500

D. ₹22,000

View answer and explanation

Correct Option: A

Demand charge = 200 × 10 = ₹2,000. Energy charge = 5 × 2000 = ₹10,000. Total = ₹12,000.

Q110Electrical Engineering (SSC JE)

Hard

A 100 MW plant operates at a capacity factor of 0.5 for a year of 8760 hours. The energy generated is

A. 876 000 MWh

B. 438 000 MWh

C. 43 800 MWh

D. 219 000 MWh

View answer and explanation

Correct Option: B

Energy = 100 × 8760 × 0.5 = 438 000 MWh.

Q111Electrical Engineering (SSC JE)

Medium

The on-load tap changer of a transformer is used to

A. change the frequency

B. increase the efficiency

C. regulate the voltage without interrupting the supply

D. reduce the iron loss

View answer and explanation

Correct Option: C

Taps in the winding are changed while the transformer carries load, using diverter and selector switches.

Q112Electrical Engineering (SSC JE)

Medium

In a single-core cable, the maximum electrostatic stress in the dielectric occurs

A. midway in the insulation

B. at the armour

C. at the sheath

D. at the surface of the conductor

View answer and explanation

Correct Option: D

The stress varies inversely with the radius, so it is highest at the conductor surface. Grading is used to even it out.

Q113Electrical Engineering (SSC JE)

Easy

The scale of a moving iron instrument is

A. logarithmic

B. cramped at the upper end

C. uniform throughout

D. non-uniform, cramped at the lower end

View answer and explanation

Correct Option: D

The deflection torque varies with the square of the current, so the scale is crowded at the low end.

Q114Electrical Engineering (SSC JE)

Hard

An energy meter has a constant of 600 rev/kWh. The disc makes 60 revolutions in 5 minutes. The load is

A. 2.4 kW

B. 0.6 kW

C. 12 kW

D. 1.2 kW

View answer and explanation

Correct Option: D

60 rev = 0.1 kWh in 5 min = 1/12 h. Power = 0.1 × 12 = 1.2 kW.

Q115Electrical Engineering (SSC JE)

Easy

A dc potentiometer is standardised using

A. a standard cell

B. a battery of unknown emf

C. a voltmeter

D. a decade resistance box

View answer and explanation

Correct Option: A

The working current is adjusted so the voltage drop along the wire matches the known emf of the standard cell, giving a known potential gradient.

Q116Electrical Engineering (SSC JE)

Easy

An LVDT is used to measure

A. resistance

B. temperature

C. displacement

D. frequency

View answer and explanation

Correct Option: C

A linear variable differential transformer converts the position of a core into an ac voltage proportional to the displacement.

Q117Electrical Engineering (SSC JE)

Easy

A thermocouple works on the principle of the

A. Peltier effect

B. Seebeck effect

C. Piezoelectric effect

D. Hall effect

View answer and explanation

Correct Option: B

A temperature difference between two junctions of dissimilar metals produces an emf (the Seebeck effect).

Q118Electrical Engineering (SSC JE)

Easy

A current transformer of ratio 200/5 is connected to an ammeter which reads 4 A. The primary current is

A. 4 A

B. 200 A

C. 160 A

D. 40 A

View answer and explanation

Correct Option: C

The ratio is 40, so I1 = 4 × 40 = 160 A.

Q119Electrical Engineering (SSC JE)

Hard

A 3½ digit digital voltmeter can display a maximum reading of

A. 1999

B. 3999

C. 9999

D. 999

View answer and explanation

Correct Option: A

The half digit can only be 0 or 1, so the display runs from −1999 to +1999.

Q120Electrical Engineering (SSC JE)

Hard

On the 2 V range, a 3½ digit digital voltmeter has a resolution of

A. 1 V

B. 1 mV

C. 0.1 mV

D. 10 mV

View answer and explanation

Correct Option: B

The full-scale display is 1.999 V with three decimals, so the smallest step is 0.001 V.

Q121Electrical Engineering (SSC JE)

Easy

An error due to wrong calibration of an instrument is a

A. random error

B. parallax error only

C. systematic error

D. gross error

View answer and explanation

Correct Option: C

It is repeatable and consistent in direction, and can be corrected by recalibration.

Q122Electrical Engineering (SSC JE)

Hard

A wattmeter has ratings of 150 V, 5 A and a full scale of 150 divisions. The wattmeter constant is

A. 25 W per division

B. 1 W per division

C. 0.2 W per division

D. 5 W per division

View answer and explanation

Correct Option: D

Full-scale power = 150 × 5 = 750 W. Constant = 750/150 = 5 W per division.

Q123Electrical Engineering (SSC JE)

Hard

A second order system has the characteristic equation s² + 4s + 16 = 0. The damping ratio is

A. 1

B. 0.25

C. 0.5

D. 2

View answer and explanation

Correct Option: C

ωn² = 16, so ωn = 4. 2ζωn = 4, so ζ = 4/(2 × 4) = 0.5.

Q124Electrical Engineering (SSC JE)

Hard

The percentage peak overshoot of a standard second order system with ζ = 0.5 is about

A. 37 percent

B. 4.3 percent

C. 16.3 percent

D. 50 percent

View answer and explanation

Correct Option: C

Mp = exp(−πζ / √(1 − ζ²)) = exp(−1.814) = 0.163.

Q125Electrical Engineering (SSC JE)

Medium

For a unity feedback type-1 system, the steady state error for a unit step input is

A. zero

B. 1

C. 1/Kv

D. infinite

View answer and explanation

Correct Option: A

A type-1 system has an integrator, so it follows a step input exactly. The error for a ramp is 1/Kv.

Q126Electrical Engineering (SSC JE)

Hard

A system has the characteristic equation s³ + 2s² + 3s + 6 = 0. The system is

A. stable

B. overdamped

C. unstable

D. marginally stable

View answer and explanation

Correct Option: D

The Routh array has a zero row at s¹: (2 × 3 − 6)/2 = 0. The roots are −2 and ±j√3, so there are poles on the imaginary axis.

Q127Electrical Engineering (SSC JE)

Easy

A positive phase margin of a closed loop system indicates that the system is

A. unstable

B. marginally stable

C. overdamped

D. stable

View answer and explanation

Correct Option: D

Positive gain and phase margins in a minimum phase system mean the closed loop is stable.

Q128Electrical Engineering (SSC JE)

Medium

The Nyquist stability criterion is based on the number of encirclements of

A. the point +1 + j0 by the closed-loop response

B. the origin by the closed-loop response

C. the imaginary axis by the root locus

D. the point −1 + j0 by the open-loop frequency response

View answer and explanation

Correct Option: D

The criterion relates the encirclements of the critical point to the right half plane poles of the closed loop.

Q129Electrical Engineering (SSC JE)

Easy

The ripple factor of a full-wave rectifier with a resistive load is about

A. 0.482

B. 0.707

C. 0.121

D. 1.21

View answer and explanation

Correct Option: A

A half-wave rectifier has a ripple factor of 1.21 and a full-wave rectifier 0.482.

Q130Electrical Engineering (SSC JE)

Hard

A transistor with β = 100 is biased with a fixed base resistor RB = 470 kΩ from VCC = 10.7 V (VBE = 0.7 V). The collector current is about

A. 0.213 mA

B. 1.0 mA

C. 21.3 mA

D. 2.13 mA

View answer and explanation

Correct Option: D

IB = (10.7 − 0.7)/470 kΩ = 21.3 μA. IC = β IB = 100 × 21.3 μA = 2.13 mA.

Q131Electrical Engineering (SSC JE)

Easy

The output impedance of an ideal operational amplifier is

A. zero

B. 1 kΩ

C. equal to the input impedance

D. infinite

View answer and explanation

Correct Option: A

An ideal op-amp has infinite gain and input impedance, and zero output impedance.

Q132Electrical Engineering (SSC JE)

Easy

A non-inverting amplifier uses Rf = 90 kΩ and R1 = 10 kΩ. The voltage gain is

A. 9

B. −9

C. 11

D. 10

View answer and explanation

Correct Option: D

Gain = 1 + Rf/R1 = 1 + 9 = 10.

Q133Electrical Engineering (SSC JE)

Hard

The 4-bit 2’s complement representation of the decimal number −5 is

A. 1011

B. 0101

C. 1100

D. 1010

View answer and explanation

Correct Option: A

5 = 0101. Invert to get 1010 and add 1 to get 1011.

Q134Electrical Engineering (SSC JE)

Easy

A JK flip-flop with J = K = 1 and a clock pulse

A. holds its previous state

B. resets its output

C. sets its output

D. toggles its output

View answer and explanation

Correct Option: D

With both inputs high the output complements on each clock pulse, which is the basis of counters.

Q135Electrical Engineering (SSC JE)

Easy

The minimum number of flip-flops needed to build a mod-10 counter is

A. 5

B. 10

C. 4

D. 3

View answer and explanation

Correct Option: C

Ten states need ⌈log₂ 10⌉ = 4 flip-flops, and the counter is reset at count 10.

Q136Electrical Engineering (SSC JE)

Easy

The Boolean expression A + A′B simplifies to

A. A′ + B

B. AB

C. A

D. A + B

View answer and explanation

Correct Option: D

A + A′B = (A + A′)(A + B) = A + B.

Q137Electrical Engineering (SSC JE)

Hard

A single-phase fully controlled bridge rectifier has a peak supply voltage of 300 V and a firing angle of 60°. The average output voltage (continuous conduction) is about

A. 95.5 V

B. 165.4 V

C. 47.7 V

D. 191 V

View answer and explanation

Correct Option: A

Vdc = (2Vm/π) cos α = (600/π) × 0.5 = 95.5 V.

Q138Electrical Engineering (SSC JE)

Hard

A step-up (boost) chopper has an input of 50 V and a duty ratio of 0.6. The output voltage is

A. 83.3 V

B. 200 V

C. 125 V

D. 30 V

View answer and explanation

Correct Option: C

Vo = Vin / (1 − D) = 50 / 0.4 = 125 V.

Q139Electrical Engineering (SSC JE)

Medium

In a voltage source inverter, feedback diodes across the switches are needed to

A. raise the output frequency

B. carry the reactive load current

C. protect against overvoltage on the supply

D. reduce the harmonics to zero

View answer and explanation

Correct Option: B

With an inductive load, the current continues to flow when the switches turn off. The diodes return the energy to the dc source.

Q140Electrical Engineering (SSC JE)

Easy

A TRIAC is equivalent to

A. two SCRs connected in series

B. two diodes in parallel

C. an SCR and a diode in series

D. two SCRs connected in antiparallel

View answer and explanation

Correct Option: D

It conducts in both directions and is triggered by a gate pulse of either polarity, so it is used for ac power control.

Q141Electrical Engineering (SSC JE)

Medium

A snubber circuit across an SCR protects it against

A. overvoltage on the gate

B. a high rate of rise of voltage (dv/dt)

C. a low holding current

D. a high rate of rise of current (di/dt)

View answer and explanation

Correct Option: B

The RC network slows the rise of the anode voltage, which would otherwise turn the device on falsely.

Q142Electrical Engineering (SSC JE)

Medium

In the V/f control of an induction motor, the ratio of voltage to frequency is kept constant in order to

A. keep the power factor at unity

B. increase the starting current

C. maintain a constant air gap flux

D. maintain a constant slip

View answer and explanation

Correct Option: C

The flux is proportional to V/f. Constant flux gives a constant torque capability over the speed range below the base speed.

Q143Electrical Engineering (SSC JE)

Hard

A room of 10 m × 6 m must be lit to 300 lux. The utilisation factor is 0.5 and the maintenance factor is 0.8. The total luminous flux required is

A. 22 500 lm

B. 90 000 lm

C. 18 000 lm

D. 45 000 lm

View answer and explanation

Correct Option: D

Flux = E A / (UF × MF) = 300 × 60 / (0.5 × 0.8) = 45 000 lm.

Q144Electrical Engineering (SSC JE)

Hard

A 10 kW heating element is designed to operate at 230 V. Its resistance is about

A. 5.29 Ω

B. 0.043 Ω

C. 52.9 Ω

D. 23 Ω

View answer and explanation

Correct Option: A

R = V²/P = 230² / 10 000 = 5.29 Ω.

Q145Electrical Engineering (SSC JE)

Easy

Regenerative braking in electric traction

A. is possible only in steam locomotives

B. needs no electrical machine

C. wastes the energy as heat in resistors

D. returns the kinetic energy of the train to the supply

View answer and explanation

Correct Option: D

The traction motors act as generators during braking and feed power back to the overhead line.

Q146Electrical Engineering (SSC JE)

Easy

According to Faraday’s first law of electrolysis, the mass of a substance deposited is proportional to

A. the square of the current

B. the temperature of the electrolyte

C. the voltage applied

D. the quantity of charge passed

View answer and explanation

Correct Option: D

m = Z Q, where Z is the electrochemical equivalent of the substance.

Q147Electrical Engineering (SSC JE)

Easy

The Fourier transform of a rectangular pulse is a

A. sinc function

B. delta function

C. step function

D. rectangular function

View answer and explanation

Correct Option: A

A pulse of width T has a spectrum proportional to sin(ωT/2)/(ω/2).

Q148Electrical Engineering (SSC JE)

Easy

Convolution of two signals in the time domain corresponds to which operation in the frequency domain?

A. division

B. multiplication

C. addition

D. differentiation

View answer and explanation

Correct Option: B

If y(t) = x(t) * h(t), then Y(ω) = X(ω) H(ω). This is why filtering is easier in the frequency domain.

Q149Electrical Engineering (SSC JE)

Easy

The Laplace transform of e^(−at) u(t) is

A. 1 / (s − a)

B. 1 / (s + a)

C. a / s

D. s / (s + a)

View answer and explanation

Correct Option: B

∫ e^(−at) e^(−st) dt from 0 to ∞ = 1 / (s + a).

Q150Electrical Engineering (SSC JE)

Hard

The energy of the signal x(t) = e^(−t) u(t) is

A. 2

B. 0.5

C. 0.25

D. 1

View answer and explanation

Correct Option: B

E = ∫ e^(−2t) dt from 0 to ∞ = 1/2.

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