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
Farhan scored more runs than Raju. Simran scored more runs than Nitu but lesser runs than Raju. Who scored the highest runs?
A Nitu
B Farhan
C Simran
D Raju
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
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
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
In the squirrel-cage induction motor the rotor slots are usually given slight skew
A To reduce the magnetic hum and locking tendency of the rotor
B To increase the tensile strength of the rotor bars
C To ensure easy fabrication
D None of the above
In a three-phase induction motor, the number of poles in the rotor winding is always
A Zero
B More than the number of poles in stator
C Less than number of poles in stator
D Equal to number of poles in stator
The injected e.m.f. in the rotor of induction motor must have
A Zero frequency
B The same frequency as the slip frequency
C The same phase as the rotor e.m.f.
D High value for the satisfactory speed control
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
The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it
A improves the efficiency
B helps the rotor teeth to remain under the stator teeth
C helps in reducing the tendency of the rotor teeth to remain under the stator teeth
D improves the power factor

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