Single Phase Induction Motor Online Quiz Questions - Set 09 - ObjectiveBooks

# Practice Test: Question Set - 09

1. Which of the following statements regarding repulsion-start induction motor is incorrect?
(A) It requires more maintenance of commutator and other mechanical devices
(B) It makes quite a bit of noise on starting
(C) In fractional horse power motors, it has replaced the capacitor motors
(D) It is not easily reversed

2. 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

3. Which motor is normally free from mechanical and magnetic vibrations?
(A) Split phase motor
(B) Universal motor
(C) Hysteresis motor
(D) Shaded pole motor

4. Single phase induction motor usually operates on
(A) 0.6 power factor lagging
(B) 0.8 power factor lagging
(C) 0.8 power factor leading
(D) Unity power factor

5. 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

6. A hysteresis motor works on the principle of
(A) Hysteresis loss
(B) Magnetization of rotor
(C) Eddy current loss
(D) Electromagnetic induction

7. Which of the following motors can be used for unity power factor?
(A) Capacitor run motor
(B) Shaded pole motor
(C) Hysteresis motor
(D) Schrage motor

8. A shaded pole motor does not possess
(A) Centrifugal switch
(B) Capacitor
(C) Commutator
(D) All of the above

9. In a split phase motor
(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

10. Which of the following motors will operate at high power factor?
(A) Shaped pole motor
(B) Split phase motor
(C) Capacitor start motor
(D) Capacitor run motor

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