Related Questions

Centrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed
A 30 to 40
B 70 to 80
C 80 to 90
D 100
While starting a synchronous motor by induction motor action, field winding is usually
A connected to D.C. supply
B short-circuited by low resistance
C kept open-circuited
D none of the above
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
A induction motor torque in field winding
B induction motor torque in damper winding
C eddy current and hysteresis torque in pole faces
D reHetance motor torque due to saliency of the rotor
E all of the above methods
The trap which is provided to disconnect the house drain from the street sewer is called
A Master trap
B Intercepting trap
C Interception manhole
D All the above
In a single phase motor the centrifugal switch
A disconnects auxiliary winding of the motor
B disconnects main winding of the motor
C reconnects the main winding the motor
D reconnects the auxiliary winding of the motor
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then
A motor will not come up to speed
B motor will not carry the load
C current drawn by the motor will be excessively high
D electrolytic capacitor will, in all probability, suffer break down
The starting winding of a single-phase motor is placed in
A Armature
B Field
C Rotor
D Stator
In a capacitor start motor, the phase displacement between starting and running winding can be nearly
A 10°
B 30°
C 60°
D 90°
After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on
A running winding
B rotor winding
C field winding
D compensating winding
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a
A Magnetic relay
B Thermal relay
C Centrifugal switch
D None of the above

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