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Synchronous Motors

Synchronous Motors
The construction of a synchronous motor resembles

a rotary converter
an induction motor
an alternator
a series motor

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Synchronous Motors
A synchronous motor working at leading power factor can be used as

Noise generator
Mechanical synchronizer
Voltage booster
Phase advancer

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Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is

2 percent
Zero
10 percent
4 percent

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Synchronous Motors
The efficiency of a properly designed synchronous motor will usually fall in range

99 to 99.5%
85 to 95%
60 to 70%
75 to 80%

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Synchronous Motors
A 50 Hz synchronous motor runs at 200 rpm. The number of salient poles on the rotor are______

36
16
30
None of the listed here

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Synchronous Motors
A synchronous motor develops maximum power when load angle is

120°
90°
45°
60°

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