Related Questions

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.
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
A synchronous motor working at leading power factor can be used as
A voltage booster
B phase advancer
C noise generator
D mechanical synchronizer
A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as
A static condenser
B condenser
C synchronous condenser
D none of the above
The induced e.m.f. in a synchronous motor working on leading power factor will be
A more than the supply voltage
B less than the supply voltage
C equal to the supply voltage
D none of the above
A single phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is -
A 87.8%
B 86.7%
C 88.26%
D 88.9%
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
The power factor indicates how much of the apparent power is reactive power.
A True
B False
The power factor (PF) indicates how much of the apparent power is true power.
A True
B False
If Q is load factor, S is shape factor and F is factor of safety in elastic design, the following:
A Q = S + F
B Q = S - F
C Q = F - S
D Q = S × F

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