Single Phase Induction Motors Knowledge Test - Set 01

Practice Test: Question Set - 01


1. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in
    (A) Damage to the starting winding
    (B) Damage to the centrifugal switch
    (C) Overloading of running winding
    (D) None of the above

2. 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

3. In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will
    (A) Become unstable
    (B) Draw excessive armature current and may burn out
    (C) Fall out of synchronism and come to stand still
    (D) Run as induction motor

4. Speed control of a universal motor is achieved by
    (A) Varying field flux with tapped field windings
    (B) Connecting rheostat in series
    (C) Applying variable voltage by means of silicon controlled rectifier
    (D) All of the above methods

5. The starting winding of a single-phase motor is placed in
    (A) Armature
    (B) Field
    (C) Rotor
    (D) Stator

6. 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

7. Short-circuiter is used in
    (A) Repulsion induction motor
    (B) Repulsion motor
    (C) Repulsion start induction run motor
    (D) None of the above

8. 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

9. Which of the following single-phase induction motors is generally used in time phonographs?
    (A) Resistance start
    (B) Capacitor start capacitor run
    (C) Shaded pole
    (D) Universal

10. The direction of rotation of universal motor can be reversed the by reversing the flow of current through
    (A) Armature winding
    (B) Field winding
    (C) Either armature winding or field winding
    (D) None of the above

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Item Reviewed: Single Phase Induction Motors Knowledge Test - Set 01 Rating: 5 Reviewed By: Pranab Debnath
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