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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