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Electrical Engineering
Polyphase Induction Motors
Quiz 5
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Q.1
A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor
Will continue running burning its one phase
Will continue running burning its two phases
Will stop and carry heavy current causing permanent damage to its winding
Will continue running without any harm to the winding
Q.2
The stating torque of the slip ring induction motor can be increased by adding
External inductance to the rotor
External resistance to the rotor
External capacitance to the rotor
Both resistance and inductance to rotor
Q.3
Reduced voltage starter can be used with
Slip ring motor only but not with squirrel cage induction motor
Squirrel cage induction motor only but not with slip ring motor
Squirrel cage as well as slip ring induction motor
None of the above
Q.4
The speed of a squirrel-cage induction motor can be controlled by all of the following except
Changing supply frequency
Changing number of poles
Changing winding resistance
Reducing supply voltage
Q.5
An induction motor with 1000 r.p.m. speed will have
8 poles
6 poles
4 poles
2 poles
Q.6
Less maintenance troubles are experienced in case of
Slip ring induction motor
Squirrel cage induction motor
Both (A) and (B)
None of the above
Q.7
As load on an induction motor goes on increasing
Its power factor goes on decreasing
Its power factor remains constant
Its power factor goes on increasing even after full load
Its power factor goes on increasing up to full load and then it falls again
Q.8
Star-delta starting of motors is not possible in case of
Single phase motors
Variable speed motors
Low horse power motors
High speed motors
Q.9
In an induction motor the relationship between stator slots and rotor slots is that
Stator slots are equal to rotor slots
Stator slots are exact multiple of rotor slots
Stator slots are not exact multiple of rotor slots
None of the above
Q.10
The frame of an induction motor is usually made of
Silicon steel
Cast iron
Aluminium
Bronze
Q.11
A 3-phase slip ring motor has
Double cage rotor
Wound rotor
Short-circuited rotor
Any of the above
Q.12
Low voltage at motor terminals is due to
Inadequate motor wiring
Poorly regulated power supply
Any one of the above
None of the above
Q.13
For driving high inertia loads best type of induction motor suggested is
Slip ring type
Squirrel-cage type
Any of the above
None of the above
Q.14
5 H.P., 50Hz, 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.15
Size of a high speed motor as compared to low speed motor for the same H.P. will be
Bigger
Smaller
Same
Any of the above
Q.16
Step-less speed control of induction motor is possible by which of the following methods?
e.m.f. injection in rotor eueuit
Changing the number of poles
Cascade operation
None of the above
Q.17
When the equivalent circuit diagram of double squirrel-cage induction motor is constructed the two cages can be considered
In series
In parallel
In series-parallel
In parallel with stator
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