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Electrical Engineering
3 Phase Induction Motors
Quiz 1
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Q.1
The frame of an induction motor is usually made of
silicon steel
cast iron
aluminium
bronze
Q.2
Rotor rheostat control method of speed control is used for
squirrel-cage induction motors only
slip ring induction motors only
both (a) and (b)
none of the above
Q.3
Which of the following component is usually fabricated out of silicon steel ?
Bearings
Shaft
Statorcore
None of the above
Q.4
A 3-phaseV,Hz induction motor hasslip. The frequency of rotor e.m.f. willbe
200 Hz
50 Hz
2 Hz
0.2 Hz
Q.5
In case of 3-phase induction motors, plugging means
pulling the motor directly on line without a starter
locking of rotor due to harmonics
starting the motor on load which is more than the rated load
interchanging two supply phases for quick stopping
Q.6
If a 3-phase supply is given to the stator and rotor is short circuited rotor will move
in the opposite direction as the direction of the rotating field
in the same direction as the direction of the field
in any direction depending upon phase squence of supply
none
Q.7
The speed characteristics of an induction motor closely resemble the speedloadcharacteristics of which of the following machines
series motor
shunt motor
universal motor
none of the above
Q.8
Which type of bearing is provided in small induction motors to support the rotor shaft?
Ball bearings
Cast iron bearings
Bush bearings
None of the above
Q.9
5 H.P., 50-Hz, 3-phase,V, induction motors are available for the following r.p.m.Which motor will be the costliest ?
730 r.p.m.
960 r.p.m.
1440 r.p.m.
2880 r.p.m.
Q.10
Which is of the following data is required to draw the circle diagram for an inductionmotor ?
Block rotor test only
No load test only
Block rotor test and no-load test
Block rotor test, no-load test and stator resistance test
Q.11
The vafcie of transformation ratio of an induction motor can be found by
open-circuit test only
short-circuit test only
stator resistance test
none of the above
Q.12
The power scale of circle diagram of an induction motor can be found from
stator resistance test
no-load test only
short-circuit test only
noue of the above
Q.13
In induction motor, percentage slip depends on
supply frequency
supply voltage
copper losses in motor
none of the above
Q.14
The low power factor of induction motor is due to
rotor leakage reactance
stator reactance
the reactive lagging magnetizing current necessary to generate the magnetic flux
all of the above
Q.15
Temperature of the stator winding of a three phase induction motor is obtained by
resistance rise method
thermometer method
embedded temperature method
all above methods
Q.16
The starting torque of a three phase induction motor can be increased by
increasing slip
increasing current
both (a) and (b)
none of the above
Q.17
The circle diagram for an induction motor cannot be used to determine
efficiency
power factor
frequency
output
Q.18
Blocked rotor test on induction motors is used to find out
leakage reactance
power factor on short circuit
short-circuit current under rated voltage
all of the above
Q.19
Which motor is preferred for use in mines where explosive gases exist ?
Air motor
Induction motor
shunt motor
Synchronous motor
Q.20
The efficiency of an induction motor can be expected to be nearly
60 to 90%
80 to 90%
95 to 98%
99%
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