DDA JE Electrical ME 3 April 2023 Shift 3 Part 2

Q.21 Which of the following types of single-phase induction motors requires two capacitors?

1. Permanent split capacitor motor
2. Capacitor start-capacitor run motor
3. Split phase induction motor
4. Capacitor start induction motor

Correct Option: 2

Q.22 Which of the following materials has the highest resistivity?

1. Conductor
2. Semiconductor
3. Super conductor
4. Insulator

Correct Option: 4

DDA JE Electrical ME 3 April 2023 Shift 3 Part 2

Q23 A 3-phase, 50-Hz, 4-pole induction motor runs at a speed of 1400 rpm. Find the slip speed.

1 100 rpm
2. 1500 rpm
3. 1400 rpm
4. 50 rpm

Correct Option: 1

Q24 A sinusoidal voltage is expressed as v(t)-250 sin 1256t. Find the frequency.

1 200 Hz
2. 400 Hz
3. 50 Hz
4. 100 Hz

Correct Option: 1

Q25. State true/false for the following statements. Statement 1: For vacuum, susceptibility is zero. Statement 2: A toroidal magnet has no air gap.

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

Correct Option: 4

DDA JE Electrical ME 3 April 2023 Shift 3 Part 2

Q.26 Which of the following types of support is the most suitable for high voltage long distance overhead transmission lines?

1. Steel towers
2. Steel poles
3. RCC poles
4. Wooden poles

Correct Option:1

Q.27 A 4-pole wave connected DC generator has 360 conductors and is rotated at 1000 rpm. Find the generated voltage if the useful flux per pole is 30 mWb.

1 240 V
2. 720 V
3.360 V
4. 480 V

Correct Option: 3

Q.28 with reference to the generalized circuit constants of transmission lines, the unit of constant C is

1. Ampere
2. Volt
3. Mho
4. Obm

Correct Option: 3

Q.29 In a synchronous generator, the coil span factor is unity. What will be the angle of short pitch?

1 60°
2. 90°
3. 0°
4.30°

Correct Option: 3

DDA JE Electrical ME 3 April 2023 Shift 3 Part 2

Q.30 with reference to the corona effect in transmission lines, which of the following statements is INCORRECT?

1. It reduces the transmission efficiency.
2. The current drawn by the line due to corona is sinusoidal
3. Corona effect can be reduced by increasing conductor size.
4. Ozone is produced by corona.

Correct Option: 2

Q.31 If the capacitance between two conductors of a 3-phase transmission line is 10 uF, then the capacitance of each conductor to neutral is

1 10 μF
2. 20 μF
3. 30 μF
4.5 μF

Correct Option: 2

Q.32 Two metres X and Y require 30 mA and 60 mA, respectively, for full scale deflection. Which of the following statements is correct?

1 Y is more sensitive than X.
2. X is more sensitive than Y.
3. Data is not sufficient to decide the sensitivity.
4. Both are equally sensitive.

Correct Option: 2

Q.33 Which of the following relations is correct as per Ohm’s law?

1 V-IR
2. P-1 R
3. R-V 1
4.1-R V

Correct Option:1

DDA JE Electrical ME 3 April 2023 Shift 3 Part 2

Q.34 With reference to a DC transmission, which of the following statements is INCORRECT?

1. There are no inductance and surges in a DC transmission.
2. Corona losses are very high.
3. DC system is more efficient than AC.
4. There is no skin effect in a DC transmission.

Correct Option: 2

Q.35 An RLC series circuit has R-22 and C-20 uF and the resonance frequency of 1000 rad/sec. Find the Q-factor

1 25
2. 50
3. 45
4. 30

Correct Option: 1

Q.36 What will be the potential energy of a block having mass of 1 kg at a height of 5 m from the ground?

1 98 J
2. 49 J
3.89 J
4.94J

Correct Option: 2

Q.37 The relationship between the flux density and field intensity of a magnetic material is called the

1. magnetization curve
2. polarization curve
3. hysteresis curve
4. saturation curve

Correct Option: 1

DDA JE Electrical ME 3 April 2023 Shift 3 Part 2

Q.38 In a series RLC circuit, at resonance the______is zero.