Related Questions

Slip ring motor is preferred over squirrel cage induction motor where
A High starting torque is required
B Load torque is heavy
C Heavy pull out torque is required
D All of the above
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
A Slop speed operation
B High starting torque
C Low windage losses
D All of the above
The stating torque of the slip ring induction motor can be increased by adding
A External inductance to the rotor
B External resistance to the rotor
C External capacitance to the rotor
D Both resistance and inductance to rotor
Belted slip ring induction motor is almost invariably used for
A Water pumps
B Jaw crushers
C Centrifugal blowers
D None of the above
The shape of the torque/slip curve of induction motor is
A Parabola
B Hyperbola
C Rectangular parabola
D Straight line
In an induction motor, no-load the slip is generally
A Less than 1 %
B 1.5 %
C 2 %
D 4 %
The number of slip rings on a squirrel cage induction motor is usually
A Two
B Three
C Four
D None
Slip of an induction motor is negative when
A Magnetic field and rotor rotate in opposite direction
B Rotor speed is less than the synchronous speed of the field and are in the same direction
C Rotor speed is more than the synchronous speed of the field and are in the same direction
D None of the above
When a 400V, 50Hz, 6-pole induction motor is rotating at 960 rpm on no-load, its slip is -
A 1%
B 2%
C 3%
D 4%
The power input to an induction motor is 50 kW when it is running at 4% slip. If the stator resistance and core losses are neglected, the rotor copper loss is
A 30 kW
B 20 kW
C 2 kW
D 4 kW

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