DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

Q.21 In a string of suspension insulators, the disc nearest to the conductor has
voltage across it.

1. zero
2. maximum
3. moderate
4. minimum

Correct Option: 2

Q.22 In split-phase induction motors, the starting current is
the full load current.

1. 10 to 12 times
2. 3 to 4 times
3. 6 to 8 times
4. 8 to 10 times

Correct Option: 3

DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

Q.23 Which of the following laws states that the voltage across a resistor is directly proportional to the current ‘i’ flowing through the resistor?

1. Lenz’s law
2. Kirchhoff’s law
3. Faraday’s law
4. Ohm’s law

Correct Option: 4

Q.24 A series RLC circuit has R = 22, L = 0.025 H and C = 10 μF. Find the Q-factor.

1.30
2. 50
3. 25
4. 45

Correct Option: 3

Q.25 The resistance of a metal strip having rectangular cross-section of 2.5 cm x 0.05 cm and resistivity of 1.25 x 10-8.m is 10. Find the length of the conductor.

1. 100 m
2. 10 km
3. 10 m
4. 1 km

Correct Option: 2

DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

Q.26 A sinusoidal voltage is expressed as v(t) = 120 sin 314t. The peak-to-peak voltage for the same is

1. 120 V
2. 120 √2 V
3. 240 √2 V
4. 240 V

Correct Option: 4

Q.27 Generally, motor life doubles for each
reduction in the operating temperature.

1. 10°C
2. 40°C
3. 30°C
4. 20°C

Correct Option: 1

DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

Q.28 Which of the following methods is NOT used for calculations of medium transmission lines?

1. End condenser method
2. Rigorous method
3. Nominal- method
4. Nominal-T method

Correct Option: 2

Q.31 The shunt resistance used to extend the range in PMMC is usually made up of

1. platinum
2. manganin
3. aluminium
4. carbon

Correct Option: 2

DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

Q.32 Which of the following single-phase motors is mostly used in toys?

1. Shaded-pole induction motor
2. Capacitor-start capacitor-run motor
3. Permanent-split capacitor motor
4. Capacitor-start induction motor

Correct Option: 1

Q.33 What will be the frequency of the generated EMF if a 12-pole alternator runs at a speed of 600 rpm?

1. 50 Hz
2. 30 Hz
3. 60 Hz
4. 25 Hz

Correct Option: 3

Q.34______is the non-SI unit of magnetic flux.

1. Tesla
2. Weber
3. Maxwell
4. Henry

Correct Option: 3

DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

Q35. With reference to corona, identify whether the following statements are true or false. 1) As compared to the solid conductor, the stranded conductor has more corona effect. 2) If the spacing between the conductors is very large, corona effect will be severe.

1. 1) False, 2) False
2. 1) True, 2) False
3. 1) False, 2) True
4. 1) True, 2) True

Correct Option: 2

Q.36 Three resistors, each one of value 3.3 kn, are connected in star connection. If star to delta transformation is performed, the value of each resistor in delta connection will be

1. 1.1 ΚΩ
2. 3.3 ΚΩ
3. 6.6 ΚΩ
4. 9.9 ΚΩ

Correct Option: 4

DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

Q.37 The underground distribution system is advantageous over the overhead distribution system in terms of

1. public safety
2. flexibility
3. current-carrying capacity
4. initial cost

Correct Option: 1

Q.38 In a DC generator, the field resistance line is the plot of the_____versus the_____.

1. resistance R in field circuit, field current If
2. resistance R in armature circuit, armature current I
3. terminal voltage, armature current
4. voltage IR across field circuit, field current If

Correct Option: 4

Q.39 In a three-phase alternator, if fundamental frequency is 50 Hz, the 3rd and the 5th harmonic frequencies will be , respectively.
and

1. 250 Hz; 150 Hz
2. 150 Hz; 250 Hz
3. 100 Hz; 200 Hz
4. 300 Hz; 500 Hz

Correct Option: 2

DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

Q.40 Among the generalized circuit constants of transmission line, which constants are dimensionless?

1. Constant A and Constant B
2. Constant D and Constant A
3. Constant B and Constant C
4. Constant C and Constant D

Correct Option: 2

DDA JE Electrical ME 3 April 2023 Shift 2 Part 2

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