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
Answer: Option C
Solution (By Examveda Team)
In a single phase induction motor, the starting winding is used only during starting to provide the necessary starting torque.Once the motor reaches about 70–80% of its rated speed, the starting winding must be disconnected to prevent overheating and energy loss.
This disconnection is achieved automatically by a centrifugal switch, which operates due to the centrifugal force developed as the rotor speed increases.
A magnetic relay and a thermal relay are mainly used for protection purposes, not for disconnecting the starting winding in this application.
Hence, the starting winding of a refrigerator motor is disconnected by a centrifugal switch, making Option C the correct answer.
This Question Belongs to Electrical Engineering >> Single Phase Induction Motors
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Comments (1)
A. the starting winding is connected through a centrifugal switch
B. the running winding is connected through a centrifugal switch
C. both starting and running windings are connected through a centrifugal switch
D. centrifugal switch is used to control supply voltage
In a ceilingfan employing capacitor run motor
A. secondary winding surrounds the primary winding
B. primary winding surrounds the secondary winding
C. both are usual arrangements
D. none of the above
Which type of load is offered by cranes and hoists ?
A. Gradually varying load
B. Non-reversing, no-load start
C. Reversing, light start
D. Reversing, heavy start
Which of the following motors is preferred for tape-recorders?
A. Shaded pole motor
B. Hysteresis motor
C. Two value capacitor motor
D. Universal motor
Correct answer is Centrifugal switch