Q.1
When the voltage applied to a synchronous motor is increased, which of the following will reduce ?
Q.2
When the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected
Q.3
The effect of increasing the load on a synchronous motor running with normal excitation is to
Q.4
Synchronous motor always runs at
Q.5
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because
Q.6
Under which of the following conditions hunting of synchronous motor is likely to occur ?
Q.7
A synchronous motor will always stop when
Q.8
The power developed by a synchronous motor will be maximum when the load angle is
Q.9
In a synchronous motor, V-curves represent relation between
Q.10
A synchronous motor can operate at
Q.11
The armature current of the synchronous motor
Q.12
If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor
Q.13
The torque angle, in a synchronous motor, is the angle between
Q.14
A synchronous motor is running with normal excitation. When the load is increased, the armature current drawn by it increases because
Q.15
Which of the following motors will be used in electric clocks ?
Q.16
When a 3-phase synchronous generator is supplying a zero power factor lagging load, the armature field affects the main field in the following way
Q.17
A synchronous motor is running on a load with normal excitation. Now if the load on the motor is increased
Q.18
To limit the operating temperature an electrical machine should have proper
Q.19
If load (or torque) angle of a 4-pole synchronous motor is 6° electrical, its value in mechanical degrees is
Q.20
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
Q.21
In a synchronous motor, the armature current has large values for
Q.22
The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as
Q.23
Exciters of synchronous machines are
Q.24
A synchronous motor running with normal excitation adjusts to load increases essentially by increase in
Q.25
The oscillations in a synchronous motor can be damped out by
Q.26
A synchronous motor can be used as a synchronous capacitor when it is
Q.27
If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will
Q.28
In a synchronous motor, damper windings are provided on
Q.29
In a synchronous motor, the damping winding is generally used to
Q.30
In a synchronous motor, the magnitude of stator back e.m.f. £& depends on
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