1.
The power factor of a single-phase induction
motor is usually.
a) Lagging
b)
Always leading
c)
Unity
d)
Unity to 0.8 leading
2.
The electric motor used in portable drills is
a)
Capacitor run motor
b)
Hysteresis motor
c) Universal motor
d)
Repulsion motor
3.
Which of the following motor will give
relatively high starting torque?
a) Capacitor start motor
b)
Capacitor run motor
c)
Split phase motor
d)
Shaded pole motor
4.
The speed of universal motor is usually reduced
by using
a) gearing
b)
belts
c)
brakes
d)
chains
5.
Which of the following statements regarding
single-phase induction motors correct?
a)
It requires only one winding
b)
It can rotate in one direction only
c)
It is self-starting
d) It is not self-starting
6.
If the capacitor of a single-phase motor is
short-circuited
a) The motor will not start
b)
The motor will run
c)
The motor will run in reverse direction
d)
The motor will run in the same direction at
reduced r.p.m
7.
Which of the following motors has highest
starting torque?
a)
Repulsion motor
b)
Shaped pole motor
c) Capacitor-start motor
d)
Split-phase motor
8.
The rotor of a hysteresis motor is made of
a)
Aluminum
b)
Cast iron
c) Chrome steel
d)
Copper
9.
A repulsion motor is equipped with
a)
Slip rings
b) Commutator
c)
Both (A) and (B)
d)
None of the above
10.
A centrifugal switch is used to disconnect
starting winding when motor has
a)
Run for about 1 minute
b)
Run for about 5 minutes
c) Picked up about 50 to 70 percent of rated
speed
d)
Picked up about 10 to 25 percent of rated speed
11.
In case of a shaded pole motor the direction of
rotation of the motor is
a) From main pole to shaded pole
b)
From shaded pole to main pole
c)
Either of the above depending on voltage
d)
Either of the above depending on power factor
12.
Which of the following motor will have
relatively higher power factor?
a) Capacitor run motor
b)
Shaded pole motor
c)
Capacitor start motor
d)
Split phase motor
13.
In a capacitor start motor the phase
displacement between starting and running winding can be nearly
a)
100
b)
600
c)
300
d) 900
14.
Which of the following motors is used in mixer?
a)
Repulsion motor
b)
Reluctance motor
c)
Hysteresis motor
d) Universal motor
15.
The shaded pole motor is used for
a)
High starting torque
b) Low starting torque
c)
Medium starting torque
d)
Very high starting torque
16.
Which of the following motors is used for unity
power factor?
a)
Hysteresis motor
b) Schrage motor
c)
Universal motor
d)
Reluctance motor
17.
Which of the following motors can be run on AC.
as well as D.C. supply?
a) Universal motor
b)
Repulsion motor
c)
Synchronous motor
d)
Reluctance motor
18.
Centrifugal switch disconnects the auxiliary
winding of the motor at about ______ percent of synchronous speed
a)
30 to4O
b) 70 to 80
c)
80 to 90
d)
100
19.
Which motor is normally free from mechanical and
magnetic vibrations?
a)
Split phase motor
b)
Universal motor
c) Hysteresis motor
d)
Shaded pole motor
20.
In a single phase motor the centrifugal switch
a) Disconnects auxiliary winding of the motor
b)
Disconnects main winding of the motor
c)
Reconnects the main winding the motor
d)
Reconnects tile auxiliary winding of the motor
21.
Which of the following statements regarding
single-phase induction motor is correct?
a)
It requires only one winding
b)
It can rotate in one direction only
c)
It is self-starting
d) It is not self-starting
22.
In a split phase motor
a) The starting winding ¡s connected through a
centrifugal switch
b)
The running winding is connected through a
centrifugal switch
c)
Both starting and running windings are connected
through a centrifugal switch
d)
Centrifugal switch is used to control supply
voltage
23.
The starting winding of a single-phase motor is
placed ¡n
a)
armature
b)
field
c)
rotor
d) stator
24.
A shaded pole motor can be used for
a)
toys
b)
hair dryers
c)
circulators
d) any of the above
25.
A hysteresis motor works on the principle of
a) hysteresis loss
b)
magnetization of rotor
c)
eddy current loss
d)
electromagnetic induction