DDA JE Electrical ME 3 April 2023 Shift 1 Part 4

Q.21 The point at which shear stress in a hollow shaft subjected to a torsional moment is maximum, is located at the

1. centre of the shaft
2. middle of thickness
3. outer surface of the shaft
4. inner surface of the shaft

Correct Option: 3

Q.22 Which lubrication system is best suited for two-stroke cycle IC engines?

1. Pressure feed lubricating system
2. Mist lubrication system
3. Dry sump lubricating system
4. Wet sump lubricating system

Correct Option: 2

DDA JE Electrical ME 3 April 2023 Shift 1 Part 4

Q23. The defect in casting, in which a large, well-rounded cavity is produced by the gases which displace the molten metal at the cope surface of a casting is known as:

1. blow
2. porosity
3. blister
4. gas holes

Correct Option:1

Q.26 In a typical sensitive drilling machine, the quill.
provides feed to the drill by means of a rack and pinion on the

1. spindle
2. pillar
3. motor
4. handwheel

Correct Option: 4

DDA JE Electrical ME 3 April 2023 Shift 1 Part 4

Q.27 Based on the two given statements for the entropy change of a system during an internally reversible isothermal heat transfer process, choose the correct answer.
Statement A: Losing heat is the only way the entropy of the system can be decreased.
Statement B: The entropy change of the system can be positive or negative, depending on the direction of heat transfer.

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

Correct Option: 4

Q.28 The pipe-head loss equals the change in height of the

1. velocity head
2. pressure head only
3. gravity head only
4. hydraulic grade line

Correct Option: 4

DDA JE Electrical ME 3 April 2023 Shift 1 Part 4

Q.30 Based on the two given statements, select the correct answer.
Statement A: The first law of thermodynamics is also known as the conservation of momentum principle.
Statement B: For all adiabatic processes between two specified states of a closed system, the net work done is the same regardless of the nature of the closed system and the details of the process.

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

Correct Option: 1

DDA JE Electrical ME 3 April 2023 Shift 1 Part 4

Q31. The ratio of power developed by the runner to power available at turbine inlet is known as the turbine.
efficiency of a

1. hydraulic
2. mechanical
3. volumetric
4. generator

Correct Option: 1

Q.32 The ratio of the cylinder volumes after and before the combustion process in a compression ignition engine is known as:

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

Correct Option: 1

Q.33 ______gears are used to connect two intersecting shafts.

1. Herringbone
2. Spur
3. Worm
4. Bevel

Correct Option: 4

DDA JE Electrical ME 3 April 2023 Shift 1 Part 4