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Free download in PDF Single Phase Induction Motor Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
In a two value capacitor motor, the capacitor used for running purposes is
[A]
air capacitor
[B]
paper spaced oil filled type
[C]
ceramic type
[D]
a.c. electrolytic type
Answer: paper spaced oil filled type
(22)
Which of the following motors will operate at high power factor ?
[A]
Shaped pole motor
[B]
Split phase motor
[C]
Capacitor start motor
[D]
Capacitor run motor
Answer: Capacitor run motor
(23)
In split-phase motor auxiliary winding is of
[A]
thick wire placed at the bottom of the slots
[B]
thick wire placed at the top of the slots
[C]
thin wire placed at the top of the slots
[D]
thin wire placed at the bottom of the slots
Answer: thin wire placed at the top of the slots
(24)
Single phase induction motor usually operates on
[A]
0.6 power factor lagging
[B]
0.8 power factor lagging
[C]
0.8 power factor leading
[D]
unity power factor
Answer: 0.6 power factor lagging
(25)
Which of the following single-phase motors is suitable for timing and control purposes ?
[A]
Reluctance motor
[B]
Series motor
[C]
Repulsion motor
[D]
Universal motor
(26)
A universal motor can run on
[A]
A.C. only
[B]
D.C. only
[C]
either A.C. or D.C.
[D]
none of the above
Answer: either A.C. or D.C.
(27)
A schrage motor can run on
[A]
zero slip
[B]
negative slip
[C]
positive slip
[D]
all of the above
(28)
A single-phase induction motor is
[A]
inherently self-starting with high torque
[B]
inherently self-starting with low torque
[C]
inherently non-self-starting with low torque
[D]
inherently non-self-starting with high torque
Answer: inherently non-self-starting with low torque
(29)
Which of the following motors is preferred for tape-recorders ?
[A]
Shaded pole motor
[B]
Hysteresis motor
[C]
Two value capacitor motor
[D]
Universal motor
(30)
The motor used on small lathes is usually
[A]
universal motor
[B]
D.C. shunt motor
[C]
single-phase capacitor run motor
[D]
3-phase synchronous motor
Answer: single-phase capacitor run motor
31
For which of the applications a reluctance motor is preferred ?
[A]
Electric shavers
[B]
Refrigerators
[C]
Signalling and timing devices
[D]
Lifts and hoists
Answer: Signalling and timing devices
32
Which of the following motor will give the highest starting torque ?
[A]
D.C. shunt motor
[B]
Schrage motor
[C]
Repulsion start and induction run motor
[D]
Universal motor
33
A hysteresis motor works on the principle of
[A]
hysteresis loss
[B]
magnetisation of rotor
[C]
eddy current loss
[D]
electromagnetic induction
34
A shaded pole motor can be used for
[A]
toys
[B]
hair dryers
[C]
circulators
[D]
any of the above
35
The power factor of a single-phase induction motor is usually
[A]
lagging
[B]
always leading
[C]
unity
[D]
unity to 0.8 leading
36
In a capacitor start single-phase motor, when capacitor is replaced by a resistance
[A]
torque will increase
[B]
the motor will consume less power
[C]
motor will run in reverse direction
[D]
motor will continue to run in same direction
Answer: motor will continue to run in same direction
37
The range of efficiency for shaded pole motors is
[A]
95% to 99%
[B]
80% to 90%
[C]
50% to 75%
[D]
5% to 35%
38
Short-circuiter is used in
[A]
repulsion induction motor
[B]
repulsion motor
[C]
repulsion start induction run motor
[D]
none of the above
Answer: repulsion start induction run motor
39
Direction of rotation of a split phase motor can be reversed by reversing the connection of
[A]
running winding only
[B]
starting winding only
[C]
either (a) or (b)
[D]
both (a) and (b)
Answer: either (a) or (b)
40
Burning out of winding is due to
[A]
short circuited capacitor
[B]
capacitor value hiving changed
[C]
open circuiting of capacitor
[D]
none of the above
Answer: short circuited capacitor
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