Related Questions

A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
A remain same
B go down
C improve
D none of the above
If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor
A will become more
B will become less
C will remain unchanged
D none of the above.
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
A become more
B become less
C remain constant
D none of the above
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because
A synchronous motor has no slip
B stator supply is not required to produce magnetic field
C mechanical load on the rotor remains constant
D synchronous motor has large airgap
The power factor of a synchronous motor is better than that of induction motor because
A stator supply is relieved of responsibility of producing magnetic field
B mechanical load on the motor can be adjusted
C synchronous motor runs at synchronous speed
D synchronous motor has large air gap
The primary reason for low power factor is supply system is due to installation of
A induction motors
B synchronous motors
C single phase motors
D d.c. motors
A power supply which has voltage regulation of ___________ is unregulated power supply
A 0%
B 5%
C 10%
D 8%
In a low power factor wattmeter the compensating coil is connected
A in series with current coil
B in parallel with current coil
C in series with pressure coil
D in parallel with pressure coil
In a low power factor wattmeter the pressure coil is connected
A to the supply side of the current coil
B to the load side of the current coil
C in any of the two meters at connection
D none of the above
The low power factor of induction motor is due to
A Rotor leakage reactance
B Stator reactance
C The reactive lagging magnetizing current necessary to generate the magnetic flux
D All of the above

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