DDA JE Electrical ME 3 April 2023 Shift 2 Part 3

Q.5 Friction factor in circular pipes depends on the

1. length of the pipe
2. pressure head
3. Reynolds number
4. datum head

Correct Option: 3

DDA JE Electrical ME 3 April 2023 Shift 2 Part 3

Q7. The most commonly used ranges (in percentage) of sand, clay, water and additives in a green sand mould are respectively.

1. 60-70, 20-30, 1-10 and 1-3
2. 50-65, 30-40, 5-10 and 5-10
3. 70-85, 10-20, 3-6 and 1-6
4. 55-70, 20-35, 3-8 and 4-8

Correct Option: 3

DDA JE Electrical ME 3 April 2023 Shift 2 Part 3

Q.9 Which of the following is a Bernoulli-type obstruction flow measuring device?

1. Venturi tube
2. Rotameter
3. Vortex meter
4. Coriolis mass flow meter

Correct Option: 1

DDA JE Electrical ME 3 April 2023 Shift 2 Part 3

Q.10 Which of the following options is correct as an advantage of air-cooled IC engines?

1. Air-cooled IC engines have little clearances between their various parts.
2. Air-cooled IC engines create less noise.
3. The volumetric efficiency is high.
4. Due to small thermal losses, the specific fuel consumption is low.

Correct Option: 4

Q.12 The ratio of the difference between the maximum speed and the minimum speed to the mean speed for a governor is known as

1. effort of the governor
2. power of the governor
3. sensitiveness of the governor
4. efficiency of the governor

Correct Option: 3

Q.13 Stream function, y, is defined for 2D incompressible flow in such a way that it satisfies

1. Bernoulli’s equation
2. energy conservation principle
3. Navier-Stokes equation
4. continuity equation

Correct Option: 4

DDA JE Electrical ME 3 April 2023 Shift 2 Part 3

Q.17 The ratio of the total volume to the clearance volume of a cylinder of a compression ignition engine is known as:

1. compression ratio
2. air-fuel ratio
3. volumetric efficiency
4. cut-off ratio

Correct Option: 1

DDA JE Electrical ME 3 April 2023 Shift 2 Part 3

Q18. Identify whether the following statements are correct or incorrect.
Statement A: A reversible adiabatic process is necessarily isentropic.
Statement B: An isentropic process is not necessarily a reversible adiabatic process.

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

Correct Option: 1

Q19. Euler’s crippling load for a column with one end fixed and another end hinged is for a column with both ends fixed.
that of the crippling load

1. three times
2. the same as
3. half of
4. two times

Correct Option: 3

DDA JE Electrical ME 3 April 2023 Shift 2 Part 3