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English SSC CGL Tier I papers. Free 60-minute mocks, 100 questions, 200 marks; +2 correct and −0.5 incorrect. Source: SSC response sheets preserved by SSC Portal. The marked archived keys have not been independently revalidated against final SSC keys; worked explanations are pending review. A/B/C/D correspond to source options 1/2/3/4.

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Civil Engineering (SSC JE)

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Question 1 · Mechanical Engineering (SSC JE) · Machine Design
The Goodman diagram is used in the design of machine members subjected to
Choose your answer for question 1
Answer and explanation

Correct answer: A

It relates the mean stress and the alternating stress for a given factor of safety against fatigue failure.

Question 2 · Mechanical Engineering (SSC JE) · Machine Design
For most steels, the endurance limit is roughly
Choose your answer for question 2
Answer and explanation

Correct answer: D

For steels with Sut below about 1400 MPa, Se′ ≈ 0.5 Sut for a polished specimen.

Question 3 · Mechanical Engineering (SSC JE) · Machine Design
The taper on a standard sunk key is generally
Choose your answer for question 3
Answer and explanation

Correct answer: B

Taper keys are tapered on the top at 1 in 100 so that driving them in makes a tight fit.

Question 4 · Mechanical Engineering (SSC JE) · Machine Design
A deep groove ball bearing has a dynamic load rating C of 20 kN and carries an equivalent load of 10 kN. Its rated life L10 is
Choose your answer for question 4
Answer and explanation

Correct answer: B

For ball bearings L10 = (C/P)³ = 2³ = 8 million revolutions.

Question 5 · Mechanical Engineering (SSC JE) · Machine Design
The Wahl factor in a helical spring accounts for
Choose your answer for question 5
Answer and explanation

Correct answer: A

The factor K = (4C − 1)/(4C − 4) + 0.615/C corrects the simple torsion formula for these effects.

Question 6 · Mechanical Engineering (SSC JE) · Machine Design
Stress concentration at a change of section can be reduced by
Choose your answer for question 6
Answer and explanation

Correct answer: B

A smooth transition lets the force flow lines change direction gradually.

Question 7 · Mechanical Engineering (SSC JE) · Machine Design
A hollow shaft compared with a solid shaft of the same weight and material is
Choose your answer for question 7
Answer and explanation

Correct answer: D

Material removed from the centre carries little stress. Placing it farther out raises the polar moment of inertia.

Question 8 · Mechanical Engineering (SSC JE) · Machine Design
A key may fail by
Choose your answer for question 8
Answer and explanation

Correct answer: B

The torque is transmitted by shear across the key and by bearing (crushing) on its sides.

Question 9 · Mechanical Engineering (SSC JE) · Machine Design
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
Choose your answer for question 9
Answer and explanation

Correct answer: A

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

Question 10 · Mechanical Engineering (SSC JE) · Machine Design
The efficiency of a riveted joint is the ratio of
Choose your answer for question 10
Answer and explanation

Correct answer: A

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

Question 11 · Mechanical Engineering (SSC JE) · Machine Design
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
Choose your answer for question 11
Answer and explanation

Correct answer: C

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

Question 12 · Mechanical Engineering (SSC JE) · Machine Design
The Lewis equation is used to estimate
Choose your answer for question 12
Answer and explanation

Correct answer: B

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

Question 13 · Mechanical Engineering (SSC JE) · Machine Design
The Sommerfeld number in the design of journal bearings is
Choose your answer for question 13
Answer and explanation

Correct answer: A

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

Question 14 · Mechanical Engineering (SSC JE) · Machine Design
Two springs of stiffness 100 N/mm each are connected in series. The equivalent stiffness is
Choose your answer for question 14
Answer and explanation

Correct answer: B

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

Question 15 · Mechanical Engineering (SSC JE) · Machine Design
Among the fatigue failure criteria, the Soderberg line
Choose your answer for question 15
Answer and explanation

Correct answer: C

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

Question 16 · Mechanical Engineering (SSC JE) · Machine Design
A cotter joint is used to connect two rods which are subjected to
Choose your answer for question 16
Answer and explanation

Correct answer: B

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

Question 17 · Mechanical Engineering (SSC JE) · Machine Design
A lap joint with 2 rivets of 12 mm diameter carries a load of 30 kN. The shear stress in the rivets is about
Choose your answer for question 17
Answer and explanation

Correct answer: B

τ = P/(n × πd²/4) = 30000/(2 × 113.1) = 132.6 MPa.

Question 18 · Mechanical Engineering (SSC JE) · Machine Design
A rectangular key 8 mm wide and 50 mm long transmits a torque of 1000 N·m on a shaft of diameter 40 mm. The shear stress in the key is about
Choose your answer for question 18
Answer and explanation

Correct answer: A

Force at shaft surface F = T/(d/2) = 1000×1000/20 = 50000 N. τ = F/(b L) = 50000/(8 × 50) = 125 MPa.

Question 19 · Mechanical Engineering (SSC JE) · Machine Design
A rectangular key 12 mm wide and 80 mm long transmits a torque of 100 N·m on a shaft of diameter 50 mm. The shear stress in the key is about
Choose your answer for question 19
Answer and explanation

Correct answer: C

Force at shaft surface F = T/(d/2) = 100×1000/25 = 4000 N. τ = F/(b L) = 4000/(12 × 80) = 4.2 MPa.

Question 20 · Mechanical Engineering (SSC JE) · Machine Design
A solid shaft of diameter 60 mm has an allowable shear stress of 80 MPa. The maximum torque it can transmit is about
Choose your answer for question 20
Answer and explanation

Correct answer: A

T = π τ d³/16 = π × 80 × 60³ / 16 = 3392920 N·mm = 3392.9 N·m.

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