Explore topic-wise MCQs in Electrical Machines.

This section includes 22 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.

1.

The reactive power flow is outward from an alternator, then the alternator works at ____________

A. lagging power factor
B. leading power factor
C. zero power factor
D. normal power factor
Answer» B. leading power factor
Discussion
2.

The reactive power flow is outward from an alternator, then it is ____________

A. over excited
B. under excited
C. critically excited
D. none of the mentioned
Answer» B. under excited
Discussion
3.

Reactive power is a matter of interest at ____________

A. output terminals of generator
B. input terminal of motor
C. output terminals of generator and input terminal of motor
D. none of the mentioned
Answer» B. input terminal of motor
Discussion
4.

For a three phase synchronous motor, if the following condition is satisfied, it can be said that it is operating at ____________

A. Leading
B. Lagging
C. Upf
D. ZpfView Answer
Answer» C. Upf
Discussion
5.

For a three phase synchronous motor, if the following condition is satisfied, it can be said that it is operating at ____________ a) Leadingb) Laggingc) Upfd) ZpfView Answer

A. Leadingb) Laggingc) Upfd) ZpfView Answer a) Leading
B. Laggingc) Upfd) ZpfView Answer a) Leadingb) Lagging
C. Upfd) ZpfView Answer a) Leadingb) Laggingc) Upf
D. ZpfView Answer a) Leadingb) Laggingc) Upfd) ZpfView Answer
Answer» B. Laggingc) Upfd) ZpfView Answer a) Leadingb) Lagging
Discussion
6.

For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1.5 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?

A. Leading
B. Lagging
C. Upf
D. Zpf
Answer» C. Upf
Discussion
7.

For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?

A. Leading
B. Lagging
C. Upf
D. Zpf
Answer» B. Lagging
Discussion
8.

For an alternator, the specified load angle should be _________ for an impedance angle of ‘θ’.

A. δ=θ
B. δ=90-θ
C. δ=90+θ
D. δ=-θ
Answer» B. δ=90-θ
Discussion
9.

The condition for maximum power output for an alternator having its load impedance as (2+j) ohms is?

A. 26.56°
B. 63.43°
C. 90°
D. 116.56°
Answer» B. 63.43°
Discussion
10.

FOR_A_3_PHASE_SYNCHRONOUS_GENERATOR_OF_TERMINAL_VOLTAGE_AS_1_PU_AND_FIELD_EXCITATION_OF_1.5_PU._IF_THE_RESISTIVE_DROP_IS_0.2_PV,_THEN_WHAT_CAN_BE_CONCLUDED_FOR_POWER_FACTOR??$

A. Leading
B. Lagging
C. Upf
D. Zpf
Answer» C. Upf
Discussion
11.

For a three phase synchronous motor, if the following condition is satisfied, it can be said that it is operating at$

A.
B. Leading
C. Lagging
Answer» D.
Discussion
12.

The reactive power flow is outward from an alternator, then the alternator works at

A. lagging power factor
B. leading power factor
C. zero power factor
D. normal power factor
Answer» B. leading power factor
Discussion
13.

The reactive power flow is outward from an alternator, then it is

A. over excited
B. under excited
C. critically excited
D. none of the mentioned
Answer» B. under excited
Discussion
14.

Reactive power is a matter of interest at

A. output terminals of generator
B. input terminal of motor
C. output terminals of generator and input terminal of motor
D. none of the mentioned
Answer» B. input terminal of motor
Discussion
15.

For_a_three_phase_synchronous_motor,_if_the_following_condition_is_satisfied,_it_can_be_said_that_it_is_operating_at

A.
B. Leading
C. Lagging
Answer» C. Lagging
Discussion
16.

For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1.2 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?

A. upf
B. zpf
C. lagging pf
D. leading pf
Answer» B. zpf
Discussion
17.

for a 3 phase 315V alternator having impedance angle of 60 degree, the required load angle for the maximum power input to the generator is _______

A. 120°
B. 60°
C. 150°
D. 30°
Answer» B. 60¬¨¬®‚Äö√†√ª
Discussion
18.

With constant E,V,Z, the maximum input power can be obtained at load angle of value _______

A. 180-θ
B. 90+θ
C. θ
D. 180
Answer» B. 90+‚âà√≠‚Äö√†√®
Discussion
19.

For a 3 phase synchronous motor, the load angle should be equal to impedance angle.

A. True
B. False
Answer» B. False
Discussion
20.

For an alternator, the specified load angle should be _________ for an impedance angle of ‘θ’.$

A. δ=θ
B. δ=90-θ
C. δ=90+θ
D. δ=-θ
Answer» B. ‚âà√≠¬¨‚Ä¢=90-‚âà√≠‚Äö√†√®
Discussion
21.

The condition for maximum power output for an alternator having its load impedance as (2+j) ohms is

A. 26.56°
B. 63.43°
C. 90°
D. 116.56°
Answer» B. 63.43¬¨¬®‚Äö√†√ª
Discussion
22.

Which is the correct relation below?

A. Pim = -Pog
B. Pim = (Pog)*
C. Pim = Pog
D. Pim = -(Pog)*
Answer» B. Pim = (Pog)*
Discussion