Related Questions

In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then
A the motor is said to be fully loaded
B the torque generated is maximum
C the excitation is said to be zero per cent
D the excitation is said to be hundred per cent
An over excited synchronous motor on noload is known as
A synchronous condenser
B generator
C induction motor
D alternator
In an actual transformer the iron loss remains practically constant from noload to fullload because
A value of transformation ratio remains constant
B permeability of transformer core remains constant
C core flux remains practically constant
D primary voltage remains constant
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
The number of slip rings on a squirrel cage induction motor is usually
A Two
B Three
C Four
D None
In induction motor, percentage slip depends on
A Supply frequency
B Supply voltage
C Copper losses in motor
D None of the above

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