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Single Phase Motors
For the same rating, the efficiency of a single phase induction motor is _______ that of 3-phase induction motor.
Less than
More than
The same as
None of the listed here
Less than
More than
The same as
None of the listed here
Answer
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Related Question
Single Phase Motors
The rotor of a hysteresis motor is made of
Chrome steel
Cast iron
Aluminium
Copper
Chrome steel
Cast iron
Aluminium
Copper
Answer
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Single Phase Motors
Most of the single phase induction motor are _____ machines.
4-pole
8-pole
6-pole
2-pole
4-pole
8-pole
6-pole
2-pole
Answer
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Single Phase Motors
The least expensive fractional horse power motor is _______motor.
Split phase
Shaded pole
Ac series
Capacitor start
Split phase
Shaded pole
Ac series
Capacitor start
Answer
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Single Phase Motors
Which of the following statements regarding a reluctance motor is incorrect ?
Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluc-tance path between stator and rotor
It cannot be reversed, ordinarily
It requires no D.C. field excitation for its operation
It is nothing else but a single-phase, salient pole synchronous-induction motor
Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluc-tance path between stator and rotor
It cannot be reversed, ordinarily
It requires no D.C. field excitation for its operation
It is nothing else but a single-phase, salient pole synchronous-induction motor
Answer
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Single Phase Motors
Most of the fractional horsepower motors have either
plain or sleeve bearings
ball or roller bearings
soft and porous bearings
hard and annealed bearings
plain or sleeve bearings
ball or roller bearings
soft and porous bearings
hard and annealed bearings
Answer
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