Related Questions

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
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
A induction motor torque in field winding
B induction motor torque in damper winding
C eddy current and hysteresis torque in pole faces
D reHetance motor torque due to saliency of the rotor
E all of the above methods
The torque of a rotor in an induction motor under running condition is maximum
A At the unit value of slip
B At the zero value of slip
C At the value of the slip which makes rotor reactance per phase equal to the resistance per phase
D At the value of the slip which makes the rotor reactance half of the rotor
The starting torque of a three phase induction motor can be increased by
A Increasing slip
B Increasing current
C Both (A) and (B)
D None 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
The starting torque of a squirrel-cage induction motor is
A low
B negligible
C same as full-load torque
D slightly more than full-load torque
The shape of the torque/slip curve of induction motor is
A Parabola
B Hyperbola
C Rectangular parabola
D Straight line
The torque of an induction motor is
A Directly proportional to slip
B Inversely proportional to slip
C Proportional to the square of the slip
D None of the above
Insertion of resistance in the rotor of an induction motor to develop a given torque
A Decreases the rotor current
B Increases the rotor current
C Rotor current becomes zero
D Rotor current remains same
Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.
A shunt motor
B series motor
C compound motor
D separately excited motor

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