SSC JE 2023 Paper II Electrical Part 4

Q.61 Centrifugal pumps dealing with mud, slurry and sewage have

1. open impeller
2. closed impeller
3. semi-closed impeller
4. isolated impeller

Correct Option: 1

Q.62 _____pressure is measured at any point in a fluid which is non-moving.

1. Hydrostatic
2. Manometric
3. Atmospheric
4. Differential

Correct Option: 1

SSC JE 2023 Paper II Electrical Part 4

Q.63 Based on the following two statements related to the manometer, select the correct option.
Statements:
A) A piezometer tube can measure the pressure in a container that is lesser than the atmospheric pressure.
B) In case of a simple U-tube manometer, if the pressure to be measured is high, then a lighter gauge fluid is preferred and, if the pressure is low, a heavier gauge fluid is preferred.

1. Both Statement A and Statement B are incorrect.
2. Both Statement A and Statement B are correct.
3. Statement A is incorrect, but Statement B is correct.
4. Statement A is correct, but Statement B is incorrect.

Correct Option: 1

Q.64 Which of the following is NOT a method of steam turbine governing?

1. Nozzle governing
2. Throttle governing
3. By-pass governing
4. Excel governing

Correct Option: 4

SSC JE 2023 Paper II Electrical Part 4

Q.65 Calculate the kinetic head (in meter) for a system wherein water is flowing through a pipe of 4 cm diameter under pressure of 20 N/cm2 and mean velocity of 2 m/s. Take g= 10 m/s2.

1. 0.2
2. 0.35
3. 0.5
4. 0.1

Correct Option: 1

Q.66 The law of thermodynamics that hints at the fact that no heat engine can have efficiency equal to 100% is the

1. zeroth law
2. third law
3. first law
4. second law

Correct Option: 4

Q.67 Which of the following is/are the correct pair(s) of reaction turbines?
1. Francis turbine – Mixed-flow turbine
2. Kaplan turbine – Radial flow turbine
3. Propeller turbine-Axial flow turbine

1. Only 1 and 3
2. Only 1 and 2
3. Only 1
4. Only 2 and 3

Correct Option: 1

SSC JE 2023 Paper II Electrical Part 4

Q.68 A gaseous system having internal energy of 50 J is being added by 100 J of heat. Calculate the amount of external work
done.

1. 150 J
2. 50 J
3. 20 J
4.23

Correct Option: 2

Q70. In a steady-flow air compressor, air enters at a speed of 5 m/s with a pressure of 1 bar and leaves at a speed of 7.5 m/s with a pressure of 7 bar. If the inlet specific volume is 0.5 m3/kg and the outlet specific volume is 0.15 m3/kg, what is the ratio of the inlet pipe diameter to the outlet pipe diameter?

1. 1:1.118
21:2.236
3. 2.236: 1
4. 1.118: 1

Correct Option: 3

SSC JE 2023 Paper II Electrical Part 4

Q.71 The main purpose of using the evaporator in a refrigeration system is to____

1. condense the refrigerant gas
2. absorb heat from the surrounding air
3. compress the refrigerant gas
4. expand the refrigerant liquid

Correct Option: 2

Q.72 What is the maximum coefficient of performance (COP) for an absorption type refrigerator wherein heating, cooling and refrigeration occur at temperatures of 100°C, 20°C and -5°C, respectively?

1.2.3
2 4.6
3. 1.15
4. 6.9

Correct Option: 1

SSC JE 2023 Paper II Electrical Part 4

Q.73 What is the coefficient of performance (COP) of a vapour compression refrigeration system if the enthalpies at the start of compression, at the end of compression and at the end of condensation are 195 kJ/kg, 220 kJ/kg and 95 kJ/kg, respectively?

1. 1
2. 0.25
3. 2
4. 4

Correct Option: 4

Q 74. A fluid cannot cross a streamline. The reason is that, at all the points, the velocity perpendicular to the streamline is

1. zero
2. non-zero
3. infinity
4. unity

Correct Option: 1

SSC JE 2023 Paper II Electrical Part 4

Q.75 The flywheel of a steam engine has a radius of gyration 1 m and mass of 3000 kg. The starting torque of the engine is 3000 N-m. The kinetic energy of such a flywheel after 10 sec from rest position will be

1. 150 KN-m
2. 1500 KN-m
3. 1.5 KN-m
4. 15 KN-m

Correct Option: 1

Q.76 What is the primary purpose of using an economiser in a boiler system?

1. To heat the feedwater by utilising heat from the exhaust flue gases
2. To cool down the exhaust flue gases
3. To increase the pressure within the boiler
4. To reduce the emission of greenhouse gases

Correct Option: 1

Q.77 Which of the following statements is true?

1. Impulse turbine occupies more space than reaction turbines for same power output.
2. Impulse turbine occupies same space as reaction turbine for the same power output.
3. Impulse turbine occupies double the space than reaction turbine for the same power output
4. Impulse turbine occupies less space than reaction turbine for the same power output

Correct Option: 4

SSC JE 2023 Paper II Electrical Part 4

Q.78 Calculate the head loss due to friction using Darcy formula when water flows through a pipe of 100 mm in diameter and 50 m long with velocity of 2 m/s. Assume f=0.005 and g = 10 m/s2.

1. 2.9
21
3. 2
4.2.2

Correct Option: 3

Q.79 The Rankine efficiency of a steam power plant:

1. is unaffected by climatic conditions
2. worst in winter as compared to that in summer
3. improves in winter as compared to that in summer
4. improves in summer as compared to that in winter

Correct Option: 3