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Single Phase Motors
In a hysteresis motor, the rotor must have
Resistivity
None of the listed here
Retentivity
Susceptibility
Resistivity
None of the listed here
Retentivity
Susceptibility
Answer
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Related Question
Single Phase Motors
The speed control of universal motor used for sewing machines is by
Friction
Centrifugal mechanism
Varying the resistance
Tapping the field
Friction
Centrifugal mechanism
Varying the resistance
Tapping the field
Answer
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Single Phase Motors
The full load efficiency of a shaded pole motor is about _______
30 to 35%
5 to 10%
70 to 80%
60 to 70%
30 to 35%
5 to 10%
70 to 80%
60 to 70%
Answer
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Single Phase Motors
In a capacitor start motor, the phase displacement between starting and running winding can be nearly
60°
10°
90°
30°
60°
10°
90°
30°
Answer
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Single Phase Motors
If the capacitor of a single-phase motor is short-circuited
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
the motor will run
the motor will run in reverse direction
the motor will run in the same direction at reduced r.p.m.
Answer
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Single Phase Motors
The direction of rotation of universal motor can be reversed the by reversing the flow of current through
Field winding
Armature winding
None of these
Either armature winding or field winding
Field winding
Armature winding
None of these
Either armature winding or field winding
Answer
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