To reverse the direction of rotation of acapacitor start motor while it is running we should___________?
A. disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding
B. disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding
C. reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply
D. reverse the direction of connections of the auxiliary winding and immediately connect it to supply
The capacitors used in single-phase capacitor motors have no__________?
A. voltage rating
B. dielectric medium
C. polarity marking
D. definite value
If a D.C. series motor is operated on A.C. supply, it will____________?
A. spark excessively
B. have poor efficiency
C. have poor power factor
D. all of the above
A universal motor is one which______________?
A. can be operated either on D.C. or A.C. supply at approximately the same speed and output
B. can be marketed internationally
C. runs at dangerously high speed on no-load
In a A.C. series motor armature coils are usually connected to commutator____________?
A. through resistance
B. through reactances
C. through capacitors
D. solidly
A repulsion motor is equipped with__________?
A. slip rings
B. commutator
C. both A. and (b)
D. none of the above