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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) · Refrigeration and Air Conditioning
A Carnot refrigerator works between 250 K and 300 K. Its COP is
Choose your answer for question 1
Answer and explanation

Correct answer: B

COP = TL/(TH − TL) = 250/50 = 5.

Question 2 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
One ton of refrigeration is equal to about
Choose your answer for question 2
Answer and explanation

Correct answer: C

1 TR = 211 kJ/min = 3.517 kW, the rate of heat removal needed to freeze one tonne of water at 0 °C in 24 hours.

Question 3 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
In a simple vapour compression refrigeration cycle, the refrigerant enters the compressor as
Choose your answer for question 3
Answer and explanation

Correct answer: B

Liquid entering the compressor would damage the valves, so the vapour is kept dry.

Question 4 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
The dew point temperature of air is the temperature at which
Choose your answer for question 4
Answer and explanation

Correct answer: D

On cooling below the dew point, vapour starts to condense.

Question 5 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
The dry bulb and wet bulb temperatures of air are equal when the relative humidity is
Choose your answer for question 5
Answer and explanation

Correct answer: B

In saturated air there is no evaporation from the wet bulb, so it reads the same as the dry bulb.

Question 6 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
Choose your answer for question 6
Answer and explanation

Correct answer: C

The refrigerant is absorbed in a solvent, pumped as a liquid and then driven off by heat in the generator, which uses much less work.

Question 7 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
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
Choose your answer for question 7
Answer and explanation

Correct answer: A

RE = 400 − 250 = 150 kJ/kg. W = 450 − 400 = 50 kJ/kg. COP = 150/50 = 3.

Question 8 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
A room has a sensible heat load of 3 kW and a latent heat load of 1 kW. The sensible heat factor is
Choose your answer for question 8
Answer and explanation

Correct answer: A

SHF = sensible / (sensible + latent) = 3 / 4 = 0.75.

Question 9 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
Air at a total pressure of 101.3 kPa has a water vapour partial pressure of 2 kPa. The humidity ratio is about
Choose your answer for question 9
Answer and explanation

Correct answer: C

ω = 0.622 pv / (p − pv) = 0.622 × 2 / 99.3 = 0.0125.

Question 10 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
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
Choose your answer for question 10
Answer and explanation

Correct answer: B

Approach = cold water temperature − wet bulb temperature = 32 − 28 = 4 °C. The range is 8 °C.

Question 11 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
Which of the following refrigerants has zero ozone depletion potential?
Choose your answer for question 11
Answer and explanation

Correct answer: 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.

Question 12 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
In a domestic refrigerator, the expansion device is usually
Choose your answer for question 12
Answer and explanation

Correct answer: D

A long narrow tube drops the pressure of the refrigerant by friction. It has no moving parts and suits small hermetic units.

Question 13 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
Water enters a cooling tower at 42 °C and leaves at 30 °C. The ambient wet bulb temperature is 25 °C. The cooling range is
Choose your answer for question 13
Answer and explanation

Correct answer: A

Range = 42 − 30 = 12 °C; approach = 30 − 25 = 5 °C; effectiveness = 12/(12 + 5) = 70.6 percent.

Question 14 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
A conditioned room has a sensible heat gain of 1 kW and a latent heat gain of 2 kW. The sensible heat factor is
Choose your answer for question 14
Answer and explanation

Correct answer: B

SHF = S/(S + L) = 1/(1 + 2) = 0.333.

Question 15 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
Water enters a cooling tower at 40 °C and leaves at 32 °C. The ambient wet bulb temperature is 26 °C. The cooling range is
Choose your answer for question 15
Answer and explanation

Correct answer: C

Range = 40 − 32 = 8 °C; approach = 32 − 26 = 6 °C; effectiveness = 8/(8 + 6) = 57.1 percent.

Question 16 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
Water enters a cooling tower at 38 °C and leaves at 32 °C. The ambient wet bulb temperature is 28 °C. The approach is
Choose your answer for question 16
Answer and explanation

Correct answer: A

Range = 38 − 32 = 6 °C; approach = 32 − 28 = 4 °C; effectiveness = 6/(6 + 4) = 60 percent.

Question 17 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
Water enters a cooling tower at 40 °C and leaves at 30 °C. The ambient wet bulb temperature is 24 °C. The tower effectiveness (range/(range + approach)) is
Choose your answer for question 17
Answer and explanation

Correct answer: B

Range = 40 − 30 = 10 °C; approach = 30 − 24 = 6 °C; effectiveness = 10/(10 + 6) = 62.5 percent.

Question 18 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
Water enters a cooling tower at 36 °C and leaves at 28 °C. The ambient wet bulb temperature is 26 °C. The approach is
Choose your answer for question 18
Answer and explanation

Correct answer: A

Range = 36 − 28 = 8 °C; approach = 28 − 26 = 2 °C; effectiveness = 8/(8 + 2) = 80 percent.

Question 19 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
Moist air at a total pressure of 95 kPa has a vapour partial pressure of 1 kPa. The humidity ratio is about
Choose your answer for question 19
Answer and explanation

Correct answer: D

ω = 0.622 pv/(p − pv) = 0.622 × 1 / (95 − 1) = 0.0066.

Question 20 · Mechanical Engineering (SSC JE) · Refrigeration and Air Conditioning
5 kg/s of air at 35 °C is cooled to 12 °C in a cooling coil (cp = 1.005 kJ/kg·K, no moisture removal). The cooling load is about
Choose your answer for question 20
Answer and explanation

Correct answer: D

Q = ṁ cp ΔT = 5 × 1.005 × (35 − 12) = 115.57 kW.

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