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
ক the motor is said to be fully loaded
খ the torque generated is maximum
গ the excitation is said to be zero per cent
ঘ the excitation is said to be hundred per cent
An over excited synchronous motor on noload is known as
ক synchronous condenser
খ generator
গ induction motor
ঘ alternator
In an actual transformer the iron loss remains practically constant from noload to fullload because
ক value of transformation ratio remains constant
খ permeability of transformer core remains constant
গ core flux remains practically constant
ঘ primary voltage remains constant
Slip ring motor is preferred over squirrel cage induction motor where
ক High starting torque is required
খ Load torque is heavy
গ Heavy pull out torque is required
ঘ All of the above
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
ক Slop speed operation
খ High starting torque
গ Low windage losses
ঘ All of the above
A 4 pole 50 Hz induction motor is running at 1300 rpm. Find the speed of stator magnetic field with respect to the rotor?
ক 200 rpm
খ 1500 rpm
গ 1300 rpm
ঘ 1700 rpm
What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero?
ক The slip of the motor will be 5%
খ The rotor will not run
গ The rotor will run at very high speed
ঘ The torque produced will be very large
The stating torque of the slip ring induction motor can be increased by adding
ক External inductance to the rotor
খ External resistance to the rotor
গ External capacitance to the rotor
ঘ Both resistance and inductance to rotor
Belted slip ring induction motor is almost invariably used for
ক Water pumps
খ Jaw crushers
গ Centrifugal blowers
ঘ None of the above
The shape of the torque/slip curve of induction motor is
ক Parabola
খ Hyperbola
গ Rectangular parabola
ঘ Straight line

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