In a shaded pole motor the shading coil usually consist of
none of the above
a multilayer fine gauge copper wire in parallel with running winding
a single turn of heavy wire which is in parallel with running winding
a single turn of heavy copper wire which is short-circuited and carries only induced current
a single turn of heavy copper wire which is short-circuited and carries only induced current
In repulsion motor maximum torque is developed when
brush axis coincides with the field axis
brush axis is at 90° electrical to the field axis
brush axis is at 45° electrical to the field axis
none of the above
brush axis is at 45° electrical to the field axis
In a ceiling fan employing capacitor run motor
secondary winding surrounds the primary winding
none of the above
both are usual arrangements
primary winding surrounds the secondary winding
secondary winding surrounds the primary winding
The shaded pole motor is used for
low starting torque
medium starting torque
high starting torque
very high starting torque
low starting torque
Locked rotor current of a shaded pole motor is
several times the full load current
slightly more than full load current
equal to full load current
less than full load current
slightly more than full load current
Which of the following statements regarding single-phase induction motors correct ?
It is not self-starting
It requires only one winding
It can rotate in one direction only
It is self-starting
It is not self-starting
Which of the following statements regarding two value capacitor motor is incorrect ?
It has high starting torque
It has low starting as well as rushing currents
It is a reversing motor
It is preferred to permanent-split single-value capacitor motor where frequent reversals are required
It is preferred to permanent-split single-value capacitor motor where frequent reversals are required
Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because
it is comparatively cheaper
it has almost non-destructible capacitor
it has low starting as well as running currents at relatively high power factor
it is quiet in operation
it has low starting as well as running currents at relatively high power factor
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then
electrolytic capacitor will in all probability suffer break down
current drawn by the motor will be excessively high
motor will not carry the load
motor will not come up to speed
electrolytic capacitor will in all probability suffer break down
Hysteresis motor is particularly useful for high-quality record players and tape-recorders because
it develops hysteresis torque which is extremely steady both in amplitude and phase
it is not subject to any magnetic or mechanical vibrations
it revolves synchronously
it can be easily manufactured in extremely small sizes of up to 1 W output
it develops hysteresis torque which is extremely steady both in amplitude and phase
पोस्ट अच्छी लगी हो तो प्लीज नीचे दिए गए लिंक पर क्लिक कर शेयर जरुर करें
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