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Electrical Engineering
Single Phase Induction Motors
Quiz 2
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Q.1
In split-phase motor auxiliary winding is of
thick wire placed at the bottom of the slots
thick wire placed at the top of the slots
thin wire placed at the top of the slots
thin wire placed at the bottom of the slots
Q.2
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
improve power factor
increase overload capacity
reduce fluctuations in torque
to improve torque
Q.3
The running winding of a single phase motor on testing with Meggar is found to be ground. Most probable location of the ground will be
At the end connections
At the end terminals
Anywhere on the winding inside a slot
At the slot edge where coil enters or comes out of the slot
Q.4
Which of the following motor will give relatively high starting torque ?
Capacitor start motor
Capacitor run motor
Split phase motor
Shaded pole motor
Q.5
Which of the following motors can be run on AC. as well as D.C. supply ?
Universal motor
Repulsion motor
Synchronous motor
Reluctance motor
Q.6
Which of the following applications always have some load whenever switched on ?
Vacuum cleaners
Fan motors
Pistol drills
All of the above
Q.7
In a split phase motor
the starting winding is connected through a centrifugal switch
the running winding is connected through a centrifugal switch
both starting and running windings are connected through a centrifugal switch
centrifugal switch is used to control supply voltage
Q.8
In a ceilingfan employing capacitor run motor
secondary winding surrounds the primary winding
primary winding surrounds the secondary winding
both are usual arrangements
none of the above
Q.9
Which of the following motors is used in a situation where load increases with speed ?
Induction motor
Three-phase series motor
Schrage motor
Hysteresis motor
Q.10
Which of the following single-phase motors is suitable for timing and control purposes ?
Reluctance motor
Series motor
Repulsion motor
Universal motor
Q.11
The wattage of motor for driving domestic sewing machine will be around
100 to 150 W
40 to 75 W
10 to 30 W
5 to 10 W
Q.12
Which of the following motors can be used for unity power factor ?
Capacitor run motor
Shaded pole motor
Hysteresis motor
Schrage motor
Q.13
If a D.C. series motor is operated on A.C. supply, it will
spark excessively
have poor efficiency
have poor power factor
all of the above
Q.14
In a capacitor start single-phase motor, when capacitor is replaced by a resistance
torque will increase
the motor will consume less power
motor will run in reverse direction
motor will continue to run in same direction
Q.15
Which of the following motors will operate at high power factor ?
Shaped pole motor
Split phase motor
Capacitor start motor
Capacitor run motor
Q.16
A hysteresis motor works on the principle of
hysteresis loss
magnetisation of rotor
eddy current loss
electromagnetic induction
Q.17
The value of starting capacitor of a fractional horse power motor will be
100 uF
200 uF
300 uF
400 uF
Q.18
Which of the following single-phase induction motors is generally used in time phonographs?
Resistance start
Capacitor start capacitor run
Shaded pole
Universal
Q.19
In a capacitor start motor, the phase displacement between starting and running winding can be nearly
10°
30°
60°
90°
Q.20
The range of efficiency for shaded pole motors is
95% to 99%
80% to 90%
50% to 75%
5% to 35%
Q.21
The purpose of stator winding in the compensated repulsion motor is to
provide mechanical balance
improve power factor and provide better speed regulation
prevent hunting in the motor
eliminate armature reaction
Q.22
Which type of load is offered by cranes and hoists ?
Gradually varying load
Non-reversing, no-load start
Reversing, light start
Reversing, heavy start
Q.23
Which of the following motors is preferred for tape-recorders?
Shaded pole motor
Hysteresis motor
Two value capacitor motor
Universal motor
Q.24
Which of the following motors has two separate windings on the motor ?
Repulsion motor
Repulsion induction motor
Repulsion start induction run motor
None of the above
Q.25
In a single phase motor the centrifugal switch
disconnects auxiliary winding of the motor
disconnects main winding of the motor
reconnects the main winding the motor
reconnects the auxiliary winding of the motor
Q.26
Short-circuiter is used in
Repulsion induction motor
Repulsion motor
Repulsion start induction run motor
None of the above
Q.27
The capacitors used in single-phase capacitor motors have no
voltage rating
dielectric medium
polarity marking
definite value
Q.28
Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because
it is comparatively cheaper
it has almost non-destructible capacitor
it has low starting as well as running currents at relatively high power factor
it is quiet in operation
Q.29
Which of the following motors is used for unity power factor ?
Hysteresis motor
Schrage motor
Universal motor
Reluctance motor
Q.30
The direction of rotation of universal motor can be reversed the by reversing the flow of current through
Armature winding
Field winding
Either armature winding or field winding
None of the above
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