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Three Phase Induction Motors(Engineering > Electrical Engineering ) Questions and Answers
Home
Topic
Engineering
Electrical Engineering
Three Phase Induction Motors
Question 1.
In an induction motor, the ratio of rotor cu loss and rotor input is given by
S
1-S
1/S
S/1-S
Explanation:-
Answer: Option A. ->
S
Question 2.
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is
2.5 Hz
1.5 Hz
5 Hz
0.05 Hz
Explanation:-
Answer: Option A. ->
2.5 Hz
Question 3.
The no load speed of an induction motor depends on
The number of its poles
The maximum flux/poles
The supply frequency
Both supply frequency and number of poles
Explanation:-
Answer: Option D. ->
Both supply frequency and number of poles
Question 4.
The rotor of induction motor
None of the listed here
Always revolves in the direction of stator flux
Insufficient data
Always revolves in the direction opposite to stator flux
Explanation:-
Answer: Option B. ->
Always revolves in the direction of stator flux
Question 5.
The induction motor has lagging power factor during
Both starting and operation
Starting only
None of the listed here
Operation only
Explanation:-
Answer: Option A. ->
Both starting and operation
Question 6.
An induction motor is so called because its operation depends on
Self induction
Hysteresis
Eddy currents
Mutual induction
Explanation:-
Answer: Option D. ->
Mutual induction
Question 7.
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.
10 to 15%
30 to 50%
15 to 20 %
5%
Explanation:-
Answer: Option B. ->
30 to 50%
Question 8.
The starting torque of a 3-phase induction motor is _______ supply voltage.
Directly proportional to sqaure of
Directly proportional to
None of the listed here
Independent of
Explanation:-
Answer: Option A. ->
Directly proportional to sqaure of
Question 9.
A high starting torque can be obtained in a 3phase induction motor by _______
None of the listed here
Decreasing rotor resistance
Increasing rotor resistance
Increasing rotor reactance
Explanation:-
Answer: Option C. ->
Increasing rotor resistance
Question 10.
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______
Decreased two times
Increased two times
Increased four times
Decreased four times
Explanation:-
Answer: Option C. ->
Increased four times
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