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
The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be___________?
(A) at the end connections
(B) at the end terminals
(C) anywhere on the winding inside a slot
(D) at the slot edge where coil enters or comes out of the slot
The value of starting capacitor of a fractional horse power motor will be__________?
(A) 100 uF
(B) 200 uF
(C) 300 uF
(D) 400 uF
A centrifugal switch is used to dis- connect ‘starting winding when motor has___________?
(A) run for about 1 minute
(B) run for about 5 minutes
(C) picked up about 50 to 70 per cent of rated speed
(D) picked up about 10 to 25 per cent of rated speed
For which of the applications a reluctance motor is preferred ?
(A) Electric shavers
(B) Refrigerators
(C) Signalling and timing devices
(D) Lifts and hoists
A hysteresis motor works on the principle of__________?
(A) hysteresis loss
(B) magnetisation of rotor
(C) eddy current loss
(D) electromagnetic induction
Which of the following motor will give the highest starting torque ?
(A) D.C. shunt motor
(B) Schrage motor
(C) Repulsion start and induction run motor
(D) Universal motor
The power factor of a single-phase induction motor is usually?
(A) lagging
(B) always leading
(C) unity
(D) unity to 0.8 leading
A shaded pole motor can be used for_____________?
(A) toys
(B) hair dryers
(C) circulators
(D) any of the above
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