Lakshya Education MCQs

Question: Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a
Options:
A.Magnetic relay
B.Thermal relay
C.Centrifugal switch
D.None of the above
Answer: Option A

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Question 1. To reverse the direction of rotation of acapacitor start motor while it is running we should
  1.    disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding
  2.    disconnect motor from supply and immediately reconnect it to supply with reversed con-nections of the main winding
  3.    reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply
  4.    reverse the direction of connections of the auxiliary winding and immediately connect it to supply
Answer: Option A
Question 2. A universal motor is one which
  1.    can be operated either on D.C. or A.C. supply at approximately the same speed and output
  2.    can be marketed internationally
  3.    runs at dangerously high speed on no-load
  4.    none of the above
Answer: Option A
Question 3. In a shaded pole motor, the shading coil usually consist of
  1.    a single turn of heavy wire which is in parallel with running winding
  2.    a single turn of heavy copper wire which is short-circuited and carries only induced current
  3.    a multilayer fine gauge copper wire in parallel with running winding
  4.    none of the above
Answer: Option B
Question 4. The power factor of a single-phase induction motor is usually
  1.    lagging
  2.    always leading
  3.    unity
  4.    unity to 0.8 leading
Answer: Option A
Question 5. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on
  1.    running winding
  2.    rotor winding
  3.    field winding
  4.    compensating winding
Answer: Option A
Question 6. Which of the following single-phase induction motors is generally used in time phonographs?
  1.    Resistance start
  2.    Capacitor start capacitor run
  3.    Shaded pole
  4.    Universal
Answer: Option C

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