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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) · Manufacturing and Production Engineering
A riser in a casting mould is provided to
Choose your answer for question 1
Answer and explanation

Correct answer: D

The riser is the last part to solidify and supplies liquid metal, which prevents shrinkage cavities in the casting.

Question 2 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
The shrinkage allowance is given on a pattern so that
Choose your answer for question 2
Answer and explanation

Correct answer: C

The pattern is made slightly larger than the finished casting to offset the contraction of metal during cooling.

Question 3 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
TIG welding uses a non-consumable electrode made of
Choose your answer for question 3
Answer and explanation

Correct answer: D

Tungsten has a very high melting point. An inert gas such as argon protects the weld pool.

Question 4 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
A workpiece of 50 mm diameter turns at 400 rpm on a lathe. The cutting speed is about
Choose your answer for question 4
Answer and explanation

Correct answer: D

V = πDN/1000 = π × 50 × 400 / 1000 = 62.8 m/min.

Question 5 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
In up milling (conventional milling), the chip thickness is
Choose your answer for question 5
Answer and explanation

Correct answer: B

The cutter rotates against the feed, so each tooth starts with a thin chip that thickens as it leaves the work.

Question 6 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
Hot working of metals is done above
Choose your answer for question 6
Answer and explanation

Correct answer: D

Above this temperature, new strain-free grains form as the metal is deformed, so it does not strain harden.

Question 7 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
In blanking, the piece punched out of the sheet is
Choose your answer for question 7
Answer and explanation

Correct answer: B

In punching, by contrast, the punched piece is waste and the sheet with holes is the product.

Question 8 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
Cold working a metal generally
Choose your answer for question 8
Answer and explanation

Correct answer: C

Strain hardening raises the yield strength but exhausts the ability of the metal to deform further.

Question 9 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
Taylor’s tool life equation is
Choose your answer for question 9
Answer and explanation

Correct answer: D

V is the cutting speed, T the tool life and n and C are constants for the tool and work material.

Question 10 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
Case hardening is done to obtain
Choose your answer for question 10
Answer and explanation

Correct answer: A

Carburising, nitriding or cyaniding adds hardness to the surface layer of a low carbon steel part.

Question 11 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
Sintering in powder metallurgy is
Choose your answer for question 11
Answer and explanation

Correct answer: D

Atoms diffuse across particle contacts at high temperature, which gives strength to the compact.

Question 12 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
Increasing the rake angle of a cutting tool generally
Choose your answer for question 12
Answer and explanation

Correct answer: C

A larger rake angle shears the chip more easily, but a very large angle weakens the cutting edge.

Question 13 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
According to Chvorinov’s rule, the solidification time of a casting is proportional to
Choose your answer for question 13
Answer and explanation

Correct answer: D

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

Question 14 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
The flux coating on a welding electrode is provided mainly to
Choose your answer for question 14
Answer and explanation

Correct answer: B

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

Question 15 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
In orthogonal cutting with a zero rake angle, the chip thickness ratio is 0.5. The shear angle is about
Choose your answer for question 15
Answer and explanation

Correct answer: B

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

Question 16 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
In a turning operation, the cutting force is 500 N and the cutting speed is 120 m/min. The power consumed in cutting is
Choose your answer for question 16
Answer and explanation

Correct answer: A

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

Question 17 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
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
Choose your answer for question 17
Answer and explanation

Correct answer: D

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

Question 18 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
In a grinding wheel designation, the letter A stands for
Choose your answer for question 18
Answer and explanation

Correct answer: A

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

Question 19 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
In electrical discharge machining (EDM), material is removed by
Choose your answer for question 19
Answer and explanation

Correct answer: A

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

Question 20 · Mechanical Engineering (SSC JE) · Manufacturing and Production Engineering
In CNC part programming, the code G01 denotes
Choose your answer for question 20
Answer and explanation

Correct answer: B

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

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