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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is
115 V.
200 V.
230 V.
460 V.
115 V.
200 V.
230 V.
460 V.
Answer
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Related Question
Electrical Machines
Tappings of a transformer are provided
at the phase end of lv side
at the neutral side end of hv side
at the middle of hv side
at the phase end of hv side
at the phase end of lv side
at the neutral side end of hv side
at the middle of hv side
at the phase end of hv side
Answer
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Electrical Machines
An unexcited single phase synchronous motor is
universal motor.
AC series motor.
repulsion motor.
reluctance motor.
universal motor.
AC series motor.
repulsion motor.
reluctance motor.
Answer
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Electrical Machines
The power developed by salient pole synchronous machine is/are
None of these
power due to saliency or reluctance only
both 1 and 2
excitation power only
None of these
power due to saliency or reluctance only
both 1 and 2
excitation power only
Answer
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Electrical Machines
In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?
The speed will increase abruptly.
The speed will increase in proportion to reduction in load.
The speed will increase gradually.
The speed will remains almost constant.
The speed will increase abruptly.
The speed will increase in proportion to reduction in load.
The speed will increase gradually.
The speed will remains almost constant.
Answer
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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift
increases in generators but decreases in motor with load.
decreases in generators and increases in motor with load.
increases in both the generators and the motors with load.
decreases in both generators and the motors with load.
increases in generators but decreases in motor with load.
decreases in generators and increases in motor with load.
increases in both the generators and the motors with load.
decreases in both generators and the motors with load.
Answer
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