DDA JE Electrical ME 3 April 2023 Shift 3 Part 1

DDA JE Electrical ME 3 April 2023 Shift 3 Part 1

DDA JE Electrical ME 3 April 2023 Shift 3 Part 1

Q1. The area of the cross section of a wire becomes half when the wire is stretched to double its length. How is the resistance of the wire affected in the new condition?

1. Resistance will be four times
2. Resistance will remain the same
3. Resistance will be doubled
4. Resistance will be halved

Correct Option: 1

Q.3 The two components of the power developed by a salient-pole synchronous motor are:

1. excitation power and magnet power
2. excitation power and reluctance power
3. friction power and windage power
4. reluctance power and friction power

Correct Option: 2

DDA JE Electrical ME 3 April 2023 Shift 3 Part 1

Q.5 In a transmission line, the receiving end power is 200 kW. If the transmission efficiency is 80%, find the line losses.

1.50 W
2. 20 W
3.60 W
4. 40 W

Correct Option: 1

Q.6 If an induction motor is made to run at synchronous speed, the value of slip will be

1. zero
2. 0.9
3. 0.5
4. 1.0

Correct Option: 1

DDA JE Electrical ME 3 April 2023 Shift 3 Part 1

Q7. In the rheostatic control method of speed control of a DC motor, which of the following parameters is varied to control the speed?

1. Field voltage
2. Armature voltage
3. Armature resistance
4. Field flux

Correct Option: 3

Q8. With reference to an AC transmission system, state true/false for the following statements.
Statement 1: AC circuit breakers are cheaper than DC circuit breakers.
Statement 2: In an AC line, the size of the conductor is greater than that in a DC line.

1. Statement 1 is false; Statement 2 is true
2. Statement 1 is true; Statement 2 is false
3. Statement 1 is true; Statement 2 is true
4. Statement 1 is false; Statement 2 is false

Correct Option: 3

DDA JE Electrical ME 3 April 2023 Shift 3 Part 1

Q.11 Which parameter in a magnetic circuit is measured in AT/Wb?

1. Permeance
2. Flux density
3. Reluctance
4. Magnetomotive force

Correct Option: 3

DDA JE Electrical ME 3 April 2023 Shift 3 Part 1

Q.12 Find the peak to peak value of the sinusoidal current represented as i(t) = 400 sin 314t.

1. 600 A
2. 200 A
3. 800 A
4. 400 A

Correct Option: 3

Q.14 A straight repulsion type motor has
starting torque and
starting current.

1. low; high
2. high; moderate
3. high; negligible
4. low; negligible

Correct Option: 2

DDA JE Electrical ME 3 April 2023 Shift 3 Part 1

Q.15 In overhead transmission lines, the annual cost of energy wasted in the conductor is:

1. inversely proportional to the resistance of the conductor
2. independent of the resistance of the conductor
3. directly proportional to the area of cross section of the conductor
4. inversely proportional to the area of cross section of the conductor

Correct Option: 4

Q.17 Find the maximum permissible current through a 400-£2, 1-W resistor.

1. 10 mA
2. 5 mA
3. 1 mA
4. 50 mA

Correct Option: 4

DDA JE Electrical ME 3 April 2023 Shift 3 Part 1

Q19. With reference to alternators, state true/false for the following statements.
Statement 1: Rotating field system eliminates the problem of sparking at the slip-rings. Statement 2: Most alternators have stator armature and rotor as field.

1. Statement 1 is true; Statement 2 is false
2. Statement 1 is false; Statement 2 is false
3. Statement 1 is true; Statement 2 is true
4. Statement 1 is false; Statement 2 is true

Correct Option: 3

Q.20 Which of the following elements is NOT a part of a transmission line?

1. Support
2. Conductor
3. Line insulator
4. Load

Correct Option: 4

DDA JE Electrical ME 3 April 2023 Shift 3 Part 1

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