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Single Phase Motors
When a universal motor is operated on no load, its speed is limited by
Armature reaction
Weight of the armature
Windage and friction
Supply voltage frequency
Armature reaction
Weight of the armature
Windage and friction
Supply voltage frequency
Answer
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Related Question
Single Phase Motors
Which of the following motor can be used for unity power factor?
Hysteresis motor
Capacitor run motor
Scharge motor
Shaded pole motor
Hysteresis motor
Capacitor run motor
Scharge motor
Shaded pole motor
Answer
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Single Phase Motors
Hysteresis motor is particularly useful for high-quality record players and tape-recorders because
it revolves synchronously
it develops hysteresis torque which is extremely steady both in amplitude and phase
it can be easily manufactured in extremely small sizes of up to 1 W output
it is not subject to any magnetic or mechanical vibrations
it revolves synchronously
it develops hysteresis torque which is extremely steady both in amplitude and phase
it can be easily manufactured in extremely small sizes of up to 1 W output
it is not subject to any magnetic or mechanical vibrations
Answer
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Single Phase Motors
If the capacitor of a single-phase motor is short-circuited
the motor will run
the motor will run in reverse direction
the motor will run in the same direction at reduced r.p.m.
the motor will not start
the motor will run
the motor will run in reverse direction
the motor will run in the same direction at reduced r.p.m.
the motor will not start
Answer
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Single Phase Motors
Which motor is normally free from mechanical and magnetic vibrations?
Universal motor
Split phase motor
Hysteresis motor
Shaded pole motor
Universal motor
Split phase motor
Hysteresis motor
Shaded pole motor
Answer
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Single Phase Motors
The wattage rating for a ceiling fan motor will be in the range
10 to 20 W
250 to 500 W
50 to 150 W
200 to 250 W
10 to 20 W
250 to 500 W
50 to 150 W
200 to 250 W
Answer
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