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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) · IC Engines

In a four-stroke engine, one power stroke occurs in every

A. four revolutions of the crankshaft B. two revolutions of the crankshaft C. half a revolution of the crankshaft D. one revolution of the crankshaft

Answer and explanation

Correct answer: B

Four strokes take 720° of crank rotation, giving one power stroke every two revolutions.

Question 2 · Mechanical Engineering (SSC JE) · IC Engines

The cetane number is a measure of

A. the calorific value of petrol B. the viscosity of lubricating oil C. the knock resistance of petrol D. the ignition quality of diesel fuel

Answer and explanation

Correct answer: D

A higher cetane number means a shorter ignition delay. The octane number rates petrol against knock.

Question 3 · Mechanical Engineering (SSC JE) · IC Engines

The approximate stoichiometric air-fuel ratio for petrol is

A. 40 : 1 B. 25 : 1 C. 5 : 1 D. 14.7 : 1

Answer and explanation

Correct answer: D

About 14.7 kg of air is needed to burn 1 kg of petrol completely.

Question 4 · Mechanical Engineering (SSC JE) · IC Engines

An engine develops 30 kW brake power while consuming fuel at 0.002 kg/s of calorific value 42 000 kJ/kg. The brake thermal efficiency is about

A. 50 percent B. 28 percent C. 35.7 percent D. 42 percent

Answer and explanation

Correct answer: C

Heat supplied = 0.002 × 42 000 = 84 kW. η = 30/84 = 0.357.

Question 5 · Mechanical Engineering (SSC JE) · IC Engines

In a diesel engine, the fuel is ignited by

A. a spark plug B. the heat of compressed air C. the exhaust gas D. a glow plug in all conditions

Answer and explanation

Correct answer: B

Air is compressed to high temperature and the injected fuel self-ignites, which is why it is called a compression ignition engine.

Question 6 · Mechanical Engineering (SSC JE) · IC Engines

The compression ratio of a typical compression ignition engine is in the range of

A. 4 to 6 B. 6 to 10 C. 30 to 40 D. 14 to 22

Answer and explanation

Correct answer: D

SI engines run at 6 to 10 to avoid knock, while CI engines need a much higher ratio to reach the self-ignition temperature.

Question 7 · Mechanical Engineering (SSC JE) · IC Engines

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

Answer and explanation

Correct answer: 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.

Question 8 · Mechanical Engineering (SSC JE) · IC Engines

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

Answer and explanation

Correct answer: A

ηm = BP/IP = 6/7.5 = 0.8.

Question 9 · Mechanical Engineering (SSC JE) · IC Engines

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)

Answer and explanation

Correct answer: D

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

Question 10 · Mechanical Engineering (SSC JE) · IC Engines

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

Answer and explanation

Correct answer: D

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

Question 11 · Mechanical Engineering (SSC JE) · IC Engines

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

Answer and explanation

Correct answer: A

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

Question 12 · Mechanical Engineering (SSC JE) · IC Engines

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

Answer and explanation

Correct answer: A

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

Question 13 · Mechanical Engineering (SSC JE) · IC Engines

An engine has an indicated power of 30 kW and a mechanical efficiency of 80 percent. Its brake power is

A. 72 kW B. 54 kW C. 24 kW D. -50 kW

Answer and explanation

Correct answer: C

BP = ηm × IP = 0.8 × 30 = 24 kW.

Question 14 · Mechanical Engineering (SSC JE) · IC Engines

An engine develops a torque of 150 N·m at 4000 rpm. The brake power is about

A. 125.66 kW B. 600 kW C. 3769.91 kW D. 62.83 kW

Answer and explanation

Correct answer: D

BP = 2πNT/60 = 2π × 4000 × 150 / 60 = 62832 W = 62.83 kW.

Question 15 · Mechanical Engineering (SSC JE) · IC Engines

The swept volume of an engine cylinder is 1000 cm³ and the clearance volume is 100 cm³. The compression ratio is

A. 11 B. 44 C. 9 D. 10

Answer and explanation

Correct answer: A

r = (Vs + Vc)/Vc = (1000 + 100)/100 = 11.

Question 16 · Mechanical Engineering (SSC JE) · IC Engines

A 8-cylinder engine has a bore of 80 mm and a stroke of 100 mm. Its total swept volume (engine capacity) is about

A. 8042 cm³ B. 503 cm³ C. 16085 cm³ D. 4021 cm³

Answer and explanation

Correct answer: D

Vs = (π/4) D² L × Z = (π/4) × 80² × 100 × 8 = 4021239 mm³ = 4021 cm³.

Question 17 · Mechanical Engineering (SSC JE) · IC Engines

The swept volume of an engine cylinder is 1500 cm³ and the clearance volume is 80 cm³. The compression ratio is

A. 18.75 B. 0.05 C. 17.75 D. 19.75

Answer and explanation

Correct answer: D

r = (Vs + Vc)/Vc = (1500 + 80)/80 = 19.75.

Question 18 · Mechanical Engineering (SSC JE) · IC Engines

The swept volume of an engine cylinder is 1000 cm³ and the clearance volume is 80 cm³. The compression ratio is

A. 13.5 B. 11.5 C. 12.5 D. 0.08

Answer and explanation

Correct answer: A

r = (Vs + Vc)/Vc = (1000 + 80)/80 = 13.5.

Question 19 · Mechanical Engineering (SSC JE) · IC Engines

An engine consumes 0.05 kg/s of air and 0.006 kg/s of fuel. The air–fuel ratio is

A. 16.7 B. 12.5 C. 8.3 D. 0.1

Answer and explanation

Correct answer: C

A/F = 0.05/0.006 = 8.3.

Question 20 · Mechanical Engineering (SSC JE) · IC Engines

A 2-cylinder, 4-stroke engine has a bore of 100 mm, a stroke of 120 mm, a mean effective pressure of 6 bar and runs at 900 rpm. The indicated power is about

A. 84.82 kW B. 8.48 kW C. 4.24 kW D. 16.96 kW

Answer and explanation

Correct answer: B

A = 0.00785 m². IP = pm L A n Z = 600 × 0.12 × 0.00785 × 450/60 × 2 = 8.48 kW.

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SSC · IC Engines practice

Previous-year papers · timed practice

SSC CGL Tier I - 09 September 2024 - Shift 1

SSC CGL Tier I - 09 September 2024 - Shift 2

SSC CGL Tier I - 09 September 2024 - Shift 3

SSC CGL Tier I - 10 September 2024 - Shift 1

SSC CGL Tier I - 10 September 2024 - Shift 2

SSC CGL Tier I - 10 September 2024 - Shift 3

SSC CGL Tier I - 11 September 2024 - Shift 1

SSC CGL Tier I - 11 September 2024 - Shift 2

SSC CGL Tier I - 11 September 2024 - Shift 3

SSC CGL Tier I - 12 September 2024 - Shift 1

SSC CGL Tier I - 12 September 2024 - Shift 2

SSC CGL Tier I - 12 September 2024 - Shift 3

SSC CGL Tier I - 13 September 2024 - Shift 1

SSC CGL Tier I - 13 September 2024 - Shift 2

SSC CGL Tier I - 13 September 2024 - Shift 3

SSC CGL Tier I - 17 September 2024 - Shift 1

SSC CGL Tier I - 17 September 2024 - Shift 2

SSC CGL Tier I - 17 September 2024 - Shift 3

SSC CGL Tier I - 18 September 2024 - Shift 1

SSC CGL Tier I - 18 September 2024 - Shift 2

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