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Single Phase Motors

Single Phase Motors
In a shaded pole motor the rotating magnetic field is produced by using

Shading coils
A capacitor
Copper windings
Salient poles

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Single Phase Motors
A capacitor-start single phase induction motor is switched on to supply with its capa-citor replaced by an inductor of equivalent reactance value. It will

start and then stop
start and run slowly
not start at all
start and run at rated speed

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Single Phase Motors
In repulsion motor direction of rotation of motor

is the same as that of brush shift
is independent of brush shift
is opposite to that of brush shift

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Single Phase Motors
For the same rating, the size of a single phase induction motor is about _______ that of the corresponding 3-phase induction motor.

1.5 times
3 times
0.33 times
The same as

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Single Phase Motors
If a DC series motor is operated on AC supply, it will

Have poor efficiency
All of the listed here
Have poor power factor
Spark excessively

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Single Phase Motors
If a single phase induction motor runs slower than normal, the most likely defect is

short-circuit in the winding
None of these
worn bearings
open-circuit in the winding

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MORE MCQ ON Single Phase Motors

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