DDA JE Electrical ME 3 April 2023 Shift 3 Part 3

Q.1 For a gear, the circle passing through the roots of the teeth is known as

1. addendum circle
2. dedendum
3. dedendum circle
4. addendum

Correct Option: 3

Q.8 Based on the following two statements on the hydraulic grade line (HGL), select the correct answer.
Statements:
A) The HGL is the energy grade line (EGL) plus the velocity head [V2/(2g)].
B) The HGL is the height to which liquid would rise in a piezometer tube attached to the flow.

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

Correct Option: 3

DDA JE Electrical ME 3 April 2023 Shift 3 Part 3

Q.10 In a steam turbine, the angle which the absolute velocity of steam at inlet makes with the plane of moving blades is known as a/an

1. inlet angle of moving blade
2. exit angle of moving blade
3. inlet angle of fixed blade
4. nozzle angle

Correct Option: 4

Q.11____is a fusion-welding process.

1. Ultrasonic welding
2. Soldering
3. Friction welding
4. Oxyfuel-gas welding

Correct Option: 4

DDA JE Electrical ME 3 April 2023 Shift 3 Part 3

Q.12 Based on the following two statements related to positive-displacement pumps (PDPs), select the correct answer. Statements:
A) At constant shaft rotation speed, a PDP produces nearly constant flow rate and virtually unlimited pressure rise, with little effect of viscosity.
B) The flow rate of a PDP cannot be varied except by changing the displacement or the speed.

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

Correct Option: 1

Q.16 Based on the following two statements on friction factor in pipe flows, select the correct answer.
Statements:
A) In case of a laminar fully developed flow through pipes, the friction factor depends on the Reynolds number and pipe roughness.
B) The friction factor at a given the Reynolds number, in the turbulent region, depends on the relative roughness (ratio of average roughness to the diameter of the pipe) rather than absolute roughness.

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

Correct Option: 1

DDA JE Electrical ME 3 April 2023 Shift 3 Part 3

Q.17 The coefficient of steadiness of a flywheel is defined as

1. the ratio of the mean speed to the maximum speed
2. the ratio of the mean speed to the maximum fluctuation of speed
3. the ratio of the minimum speed to the maximum speed
4. the ratio of the mean speed to the minimum speed

Correct Option: 2