Related Questions

What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero?
A The slip of the motor will be 5%
B The rotor will not run
C The rotor will run at very high speed
D The torque produced will be very large
The angle between the rotating stator flux and rotor poles is called _____ angle.
A torque
B obtuse
C synchronizing
D power factor
A _______ is used to measure the stator % winding temperature of the generator.
A thermocouple
B pyrometer
C resistance thermometer
D thermometer
When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor
A remains same as the original value
B decreases to half the original value
C tends to becomes zero
D increases to two times the original value
Which of the following losses is not dissipated by the stator core surface in a synchronous motor ?
A Eddy current losses in the conductors
B Iron losses in the stator
C Copper losses in the slot portion of the conductors
D Windage losses
In a synchronous motor, the magnitude of stator back e.m.f. Eb depends on
A load on the motor
B d.c. excitation only
C both the speed and rotor flux
D none of the above
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as
A locked-rotor torque
B synchronous torque
C pull up torque
D reluctance torque
The back e.m.f. in the stator of a synchronous motor depends on
A number of poles
B flux density
C rotor speed
D rotor excitation
In an induction motor the relationship between stator slots and rotor slots is that
A Stator slots are equal to rotor slots
B Stator slots are exact multiple of rotor slots
C Stator slots are not exact multiple of rotor slots
D None of the above
Insertion of resistance in the stator of an induction motor
A Increases the load torque
B Decreases the starting torque
C Increases the starting torque
D None of the above

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