Online Practice Test Single Phase Induction Motor - Set 10 - ObjectiveBooks

Online Practice Test Single Phase Induction Motor - Set 10

Practice Test: Question Set - 10


1. In split phase motor main winding is of
    (A) Thin wire placed at the top of the slots
    (B) Thin wire placed at the bottom of the slots
    (C) Thick wire placed at the bottom of the slots
    (D) Thick wire placed at the top of the slots

2. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on
    (A) Running winding
    (B) Rotor winding
    (C) Field winding
    (D) Compensating winding

3. The rotor developed by a single-phase motor at starting is
    (A) More than the rated torque
    (B) Rated torque
    (C) Less than the rated torque
    (D) Zero

4. In a capacitor start single-phase motor, when capacitor is replaced by a resistance
    (A) Torque will increase
    (B) The motor will consume less power
    (C) Motor will run in reverse direction
    (D) Motor will continue to run in same direction

5. Which of the following single-phase motors has relatively poor starting torque?
    (A) Universal motor
    (B) Repulsion motor
    (C) Capacitor motor
    (D) All single phase motors have zero starting torque

6. In a universal motor, the most common cause of brush sparking is
    (A) Open armature winding
    (B) Shorted armature winding
    (C) Shorted field winding
    (D) All of the above

7. Which of the following motors is used in a situation where load increases with speed?
    (A) Induction motor
    (B) Three-phase series motor
    (C) Schrage motor
    (D) Hysteresis motor

8. The repulsion-start induction-run motor is used because of
    (A) Good power factor
    (B) High efficiency
    (C) Minimum cost
    (D) High starting torque

9. Which of the following single-phase motors is suitable for timing and control purposes?
    (A) Reluctance motor
    (B) Series motor
    (C) Repulsion motor
    (D) Universal motor

10. In a A.C. series motor armature coils are usually connected to commutator
    (A) Through resistance
    (B) Through reactance
    (C) Through capacitors
    (D) Solidly

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