Related Questions

In a capacitor start single-phase motor, when capacitor is replaced by a resistance
A torque will increase
B the motor will consume less power
C motor will run in reverse direction
D motor will continue to run in same direction
While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is
A Short-circuited
B Open circuited
C Alright
D Leaky
In case one phase of a three-phase synchronous motor is short-circuited the motor will
A Not start
B Run at $$\frac{2}{3}$$ of synchronous speed
C Run with excessive vibrations
D Take less than the rated load
If the capacitor of a single-phase motor is short-circuited
A the motor will not start
B the motor will run
C the motor will run in reverse direction
D the motor will run in the same direction at reduced r.p.m.
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
A start and then stop
B start and run slowly
C start and run at rated speed
D not start at all
In a two value capacitor motor, the capacitor used for running purposes is
A air capacitor
B paper spaced oil filled type
C ceramic type
D a.c. electrolytic type
Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because
A it is comparatively cheaper
B it has almost non-destructible capacitor
C it has low starting as well as running currents at relatively high power factor
D it is quiet in operation
For which of the following applications a D.C. motor is preferred over an A.C. motor?
A Low speed operation
B High speed operation
C Variable speed operation
D Fixed speed operation
If a D.C. motor is to be selected for conveyors, which motor would be preferred ?
A Series motor
B Shunt motor
C Differentially compound motor
D Cumulative compound motor
Slip ring motor is preferred over squirrel cage induction motor where
A High starting torque is required
B Load torque is heavy
C Heavy pull out torque is required
D All of the above

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