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Electric Machine Daily Quiz #20
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Know MoreQuestion 1
One alternator with the waveform 220 sin 50t is to be connected across another alternator with the waveform 220 cos 50t. Choose correct option-
- Synchronisation will be bump-less
- Synchronisation will be bump-less if the polarity of the incoming one is taken care of.
- Synchronisation is not possible even if phase sequence and polarity conditions are satisfied.
- None of the above
Question 2
The lamp/ bulb rating used for the synchronisation by dark lamp method should be-
- Equal to phase to neutral voltage
- Equal to line to line voltage
- Equal to double of phase to neutral voltage
- Equal to double line to line voltage
Question 3
Synchronisation by rotating lamp method is also known as-
- One bright, two dark lamp method
- One dark, two bright lamp method
- Siemens Halske method
- 2,3
- None
Question 4
The needle of synchronoscope moves slightly anticlockwise. What does it indicate about the frequency of incoming alternator?
- Less frequency
- More frequency
- Equal to the existing alternator
- No conclusion
Question 5
The synchronising power is maximum when-
- Load is resistive i.e. upf load
- Load is not applied
- Load is reducing
- Load is added
- 225 attempts
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Oct 19ESE & GATE EE