Related Questions

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
In AC.S.R. Conductors, the insulation between aluminium and steel conductors is
A Insulin
B Bitumen
C Varnish
D No insulation is required
In which of the following motors the stator and rotor magnetic field rotate at the same speed ?
A Universal motor
B Synchronous motor
C Induction motor
D Reluctance motor
The angle between the rotating stator flux and rotor poles is called _____ angle.
A torque
B obtuse
C synchronizing
D power factor
In which of the following motors the stator and rotor fields rotate simultaneously ?
A D.C. motor
B Reluctance motor
C Universal motor
D Synchronous motor
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
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
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 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
The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of
A zero degree
B two degrees
C five degrees
D ten degrees

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