Practice Single Phase Induction Motors Multiple Choice Questions Quiz-3 - MCQGeeks.com

Q.1

The wattage rating for a ceiling fan motor will be in the range

200 to 250 W
250 to 500 W
50 to 150 W
10 to 20 W

Q.2

A schrage motor can run on

zero slip
negative slip
positive slip
all of the above

Q.3

Which motor is normally free from mechanical and magnetic vibrations ?

Split phase motor
Universal motor
Hysteresis motor
Shaded pole motor

Q.4

Single phase induction motor usually operates on

0.6 power factor lagging
0.8 power factor lagging
0.8 power factor leading
unity power factor

Q.5

In a split phase motor, the running winding should have

high resistance and low inductance
low resistance and high inductance
high resistance as well as high inductance
low resistance as well as low inductiance

Q.6

A shaded pole motor does not possess

centrifugal switch
capacitor
commutator
all of the above

Q.7

The direction of rotation of an hysteresis motor is determined by

interchanging the supply leads
position of shaded pole with respect to main pole
retentivity of the rotor material
none of these

Q.8

A repulsion motor is equipped with

slip rings
commutator
both (A) and (B)
none of the above

Q.9

In a two value capacitor motor, the capacitor used for running purposes is

air capacitor
paper spaced oil filled type
ceramic type
a.c. electrolytic type

Q.10

In capacitor start single-phase motors

current in the starting winding leads the voltage
current in the starting winding lags the voltage
current in the starting winding is in phase with voltage in running winding
none of the above

Q.11

In a hysteresis motor, the rotor must have

retentivity
resistivity
susceptibility
none of the above

Q.12

Which of the following motors is used in mixies ?

Repulsion motor
Reluctance motor
Hysteresis motor
Universal motor

Q.13

A single-phase induction motor is

inherently self-starting with high torque
inherently self-starting with low torque
inherently non-self-starting with low torque
inherently non-self-starting with high torque

Q.14

Which of the following motors is used in tape-recorders ?

Hysteresis motor
Reluctance motor
Capacitor-run motor
Universal motor

Q.15

Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.

shunt motor
series motor
compound motor
separately excited motor

Q.16

A universal motor can run on

D.C. only
D.C. only
either A.C. or D.C.
none of the above

Q.17

Locked rotor current of a shaded pole motor is

equal to full load current
less than full load current
slightly more than full load current
several times the full load current

Q.18

In split phase motor main winding is of

thin wire placed at the top of the slots
thin wire placed at the bottom of the slots
thick wire placed at the bottom of the slots
thick wire placed at the top of the? slots

Q.19

Most of the fractional horsepower motors have either

hard and annealed bearings
ball or roller bearings
soft and porous bearings
plain or sleeve bearings

Q.20

If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in

Damage to the starting winding
Damage to the centrifugal switch
Overloading of running winding
None of the above

Q.21

A.C. series motor as compared to D.C. series motor has

smaller brush width
less number of field turns
more number of armature turns
less air gap
all of the above

Q.22

In repulsion motor, maximum torque is developed when

brush axis is at 45° electrical to the field axis
brush axis coincides with the field axis
brush axis is at 90° electrical to the field axis
none of the above

Q.23

In repulsion motor, zero torque is developed when

brush axis is 45° electrical to field axis
brush axis coincides with the field axis
brush axis is 90° electrical to field axis
both (B) and (C)

Q.24

Which of the following motors has highest starting torque ?

Repulsion motor
Shaped pole motor
Capacitor-start motor
Split-phase motor

Q.25

A capacitor-start single phase induction motor is switched on to supply with its capa-citor replaced by an inductor of equivalent reactance value. It will

start and then stop
start and run slowly
start and run at rated speed
not start at all

Q.26

A shaded pole motor can be used for

toys
hair dryers
circulators
any of the above

Q.27

Hysteresis motor is particularly useful for high-quality record players and tape-recorders because

it revolves synchronously
it is not subject to any magnetic or mechanical vibrations
it can be easily manufactured in extremely small sizes of up to 1 W output
it develops hysteresis torque which is extremely steady both in amplitude and phase

Q.28

Burning out of winding is due to

short circuited capacitor
capacitor value hiving changed
open circuiting of capacitor
none of the above

Q.29

Which of the following statements regarding single-phase induction motoris correct ?

It requires only one winding
It can rotate in one direction only
It is self-starting
It is not self-starting

Q.30

Which of the following statements regarding a reluctance motor is incorrect ?

It cannot be reversed, ordinarily
It requires no D.C. field excitation for its operation
It is nothing else but a single-phase, salient pole synchronous-induction motor
Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluc-tance path between stator and rotor

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