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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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Question 1 · Mechanical Engineering (SSC JE) · Power Plant Engineering
An economiser in a steam power plant is used to heat
Choose your answer for question 1
Answer and explanation

Correct answer: D

It recovers heat from the exit flue gases and raises boiler efficiency.

Question 2 · Mechanical Engineering (SSC JE) · Power Plant Engineering
A Babcock and Wilcox boiler is a
Choose your answer for question 2
Answer and explanation

Correct answer: B

Water flows in the tubes and the hot gases pass around them, which suits high pressures and large capacities.

Question 3 · Mechanical Engineering (SSC JE) · Power Plant Engineering
The Parsons turbine is a
Choose your answer for question 3
Answer and explanation

Correct answer: B

The Parsons design has fixed and moving blades with a pressure drop in both. The De Laval turbine is an impulse turbine.

Question 4 · Mechanical Engineering (SSC JE) · Power Plant Engineering
The main function of the condenser in a steam power plant is to
Choose your answer for question 4
Answer and explanation

Correct answer: B

A low exhaust pressure gives a larger enthalpy drop in the turbine, and the condensate is reused as feed water.

Question 5 · Mechanical Engineering (SSC JE) · Power Plant Engineering
In a nuclear reactor, the moderator is used to
Choose your answer for question 5
Answer and explanation

Correct answer: A

Slow (thermal) neutrons are far more likely to cause fission in U-235. Control rods absorb neutrons and the coolant removes heat.

Question 6 · Mechanical Engineering (SSC JE) · Power Plant Engineering
A gas turbine plant works on the
Choose your answer for question 6
Answer and explanation

Correct answer: B

The Brayton cycle consists of isentropic compression, constant pressure heat addition, isentropic expansion and constant pressure heat rejection.

Question 7 · Mechanical Engineering (SSC JE) · Power Plant Engineering
A hydroelectric plant has a flow of 10 m³/s under a head of 50 m with an overall efficiency of 90 percent. The power output is about
Choose your answer for question 7
Answer and explanation

Correct answer: A

P = η ρ g Q H = 0.9 × 1000 × 9.81 × 10 × 50 = 4.41 × 10⁶ W.

Question 8 · Mechanical Engineering (SSC JE) · Power Plant Engineering
The dryness fraction of dry saturated steam is
Choose your answer for question 8
Answer and explanation

Correct answer: B

The dryness fraction x is the mass of dry vapour divided by the total mass. It is 1 for dry saturated steam and 0 for saturated liquid.

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

Correct answer: D

η = (900 − 20) / 2200 = 880/2200 = 0.40.

Question 10 · Mechanical Engineering (SSC JE) · Power Plant Engineering
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
Choose your answer for question 10
Answer and explanation

Correct answer: C

η = (8 × 2400)/30 000 = 19 200/30 000 = 0.64.

Question 11 · Mechanical Engineering (SSC JE) · Power Plant Engineering
The critical pressure ratio for the flow of superheated steam through a nozzle is about
Choose your answer for question 11
Answer and explanation

Correct answer: 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.

Question 12 · Mechanical Engineering (SSC JE) · Power Plant Engineering
The degree of reaction of a Parsons turbine is
Choose your answer for question 12
Answer and explanation

Correct answer: D

The fixed and moving blades are identical, so the pressure drop is shared equally.

Question 13 · Mechanical Engineering (SSC JE) · Power Plant Engineering
A power plant has an average load of 40 MW and a peak load of 80 MW. The load factor is
Choose your answer for question 13
Answer and explanation

Correct answer: D

Load factor = average load / peak load = 40/80 = 0.5.

Question 14 · Mechanical Engineering (SSC JE) · Power Plant Engineering
Regenerative feed water heating in a steam plant improves the cycle efficiency by
Choose your answer for question 14
Answer and explanation

Correct answer: B

Bled steam preheats the feed water, so less heat has to be added at low temperatures.

Question 15 · Mechanical Engineering (SSC JE) · Power Plant Engineering
The energy released per fission of a U-235 nucleus is about
Choose your answer for question 15
Answer and explanation

Correct answer: C

Most of the 200 MeV appears as kinetic energy of the fission fragments, which becomes heat.

Question 16 · Mechanical Engineering (SSC JE) · Power Plant Engineering
A back pressure steam turbine is used where
Choose your answer for question 16
Answer and explanation

Correct answer: A

Exhausting at a higher pressure gives less power, but the heat in the exhaust is useful in cogeneration plants.

Question 17 · Mechanical Engineering (SSC JE) · Power Plant Engineering
A hydro station has a discharge of 5 m³/s, a net head of 30 m and an overall efficiency of 85 percent. If it runs for 3000 hours a year at this output, the energy generated is about
Choose your answer for question 17
Answer and explanation

Correct answer: A

P = 1.251 MW. Energy = 1.251 × 3000 = 3752 MWh = 3.8 GWh.

Question 18 · Mechanical Engineering (SSC JE) · Power Plant Engineering
A power station of installed capacity 150 MW has an average load of 50 MW and a maximum demand of 120 MW. The capacity (plant) factor is
Choose your answer for question 18
Answer and explanation

Correct answer: D

capacity (plant) factor = average/capacity = 0.333.

Question 19 · Mechanical Engineering (SSC JE) · Power Plant Engineering
A hydro station has a discharge of 10 m³/s, a net head of 30 m and an overall efficiency of 90 percent. If it runs for 6000 hours a year at this output, the energy generated is about
Choose your answer for question 19
Answer and explanation

Correct answer: B

P = 2.649 MW. Energy = 2.649 × 6000 = 15892 MWh = 15.9 GWh.

Question 20 · Mechanical Engineering (SSC JE) · Power Plant Engineering
A hydro station has a discharge of 40 m³/s, a net head of 150 m and an overall efficiency of 88 percent. If it runs for 3000 hours a year at this output, the energy generated is about
Choose your answer for question 20
Answer and explanation

Correct answer: B

P = 51.797 MW. Energy = 51.797 × 3000 = 155390 MWh = 155.4 GWh.

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