← Back to all papers⏱️ Switch to Timed Mock Test
Free paper practiceArchived exam paper2026

SSC JE Mechanical Paper-II Practice Paper (2026 Exam Pattern, Solved Set)

SSC Junior Engineer (JE) • 2026 • 100 Questions • Free practice with solutions

CBT TEST SIMULATION
Want to test yourself under real exam timing?

Attempt this paper with interactive countdown, marking scheme, palette overview, and instant scorecard.

⏱️ Start Timed Mock →
Showing 100 Questions with Step-by-Step Solutions
Q1Mechanical 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.
Q2Mechanical 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.
Q3Mechanical 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.
Q4Mechanical 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.
Q5Mechanical 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.
Q6Mechanical 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.
Q7Mechanical 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).
Q8Mechanical 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.
Q9Mechanical 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.
Q10Mechanical 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.
Q11Mechanical 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.
Q12Mechanical 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.
Q13Mechanical 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.
Q14Mechanical 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.
Q15Mechanical 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.
Q16Mechanical 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.
Q17Mechanical 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.
Q18Mechanical 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.
Q19Mechanical 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.
Q20Mechanical 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.
Q21Mechanical 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.
Q22Mechanical 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.
Q23Mechanical 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.
Q24Mechanical 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).
Q25Mechanical 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.
Q26Mechanical 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.
Q27Mechanical 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.
Q28Mechanical 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.
Q29Mechanical 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.
Q30Mechanical 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.
Q31Mechanical 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.
Q32Mechanical 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.
Q33Mechanical 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.
Q34Mechanical 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.
Q35Mechanical 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.
Q36Mechanical 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.
Q37Mechanical 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.
Q38Mechanical 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.
Q39Mechanical 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.
Q40Mechanical 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.
Q41Mechanical 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.
Q42Mechanical 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.
Q43Mechanical 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.
Q44Mechanical 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.
Q45Mechanical 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.
Q46Mechanical 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.
Q47Mechanical 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.
Q48Mechanical 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.
Q49Mechanical 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°.
Q50Mechanical 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.
Q51Mechanical 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.
Q52Mechanical 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.
Q53Mechanical 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.
Q54Mechanical 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.
Q55Mechanical 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.
Q56Mechanical 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.
Q57Mechanical 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.
Q58Mechanical 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.
Q59Mechanical 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.
Q60Mechanical 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.
Q61Mechanical 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.
Q62Mechanical 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.
Q63Mechanical 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.
Q64Mechanical 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.
Q65Mechanical 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.
Q66Mechanical 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.
Q67Mechanical 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.
Q68Mechanical 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.
Q69Mechanical 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.
Q70Mechanical 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.
Q71Mechanical 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.
Q72Mechanical 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.
Q73Mechanical 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.
Q74Mechanical 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.
Q75Mechanical 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.
Q76Mechanical 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.
Q77Mechanical 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.
Q78Mechanical 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.
Q79Mechanical 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.
Q80Mechanical 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.
Q81Mechanical 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.
Q82Mechanical 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.
Q83Mechanical 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°.
Q84Mechanical 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.
Q85Mechanical 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.
Q86Mechanical 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).
Q87Mechanical 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.
Q88Mechanical 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.
Q89Mechanical 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.
Q90Mechanical 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.
Q91Mechanical 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.
Q92Mechanical 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.
Q93Mechanical 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.
Q94Mechanical 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.
Q95Mechanical 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.
Q96Mechanical 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.
Q97Mechanical 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.
Q98Mechanical 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.
Q99Mechanical 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.
Q100Mechanical 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.

Questions about this paper

What is the SSC Junior Engineer (JE) 2026 question paper on this page?

It is an archived SSC Junior Engineer (JE) 2026 paper with 100 questions, kept for practice. Where a source is credited on the page, the paper comes from that source.

Which subjects does SSC JE Mechanical Paper-II Practice Paper (2026 Exam Pattern, Solved Set) cover?

The 100 questions are grouped by subject: Mechanical Engineering (SSC JE) (100).

Where can I find the answer key for SSC JE Mechanical Paper-II Practice Paper (2026 Exam Pattern, Solved Set)?

Every question on this page has a "View answer" section showing the correct option, with an explanation where one is available. There is no separate download to wait for.

Can I save SSC JE Mechanical Paper-II Practice Paper (2026 Exam Pattern, Solved Set) as a PDF?

There is no separate PDF file. The whole paper is on this page, so you can use your browser's Print option and choose "Save as PDF" to keep a copy for offline revision.

How should I use this paper to prepare for SSC Junior Engineer (JE)?

First attempt it as a timed mock using the "Start timed mock" button, then review each answer here. Note the subjects where you lost marks and revise those before the next paper.

← Back to all papers
A clear next step

Turn this paper into a focused revision session.

You do not need to finish every topic today. Notice what this paper asks you to revisit.

What to know

Paper labels identify the available record. Use the original paper and final official key to resolve discrepancies.

Sources and answer-key policy

How to use this page

Review the questions you missed, check the reasoning, and choose one related topic to practise.

Build a topic practice set