Single Phase Induction Motors MCQ - Set 02 - ObjectiveBooks

Single Phase Induction Motors MCQ - Set 02

Practice Test: Question Set - 02

1. The speed control of universal motor used for sewing machines is by
    (A) Friction
    (B) Varying the resistance
    (C) Tapping the field
    (D) Centrifugal mechanism

2. The purpose of stator winding in the compensated repulsion motor is to
    (A) Provide mechanical balance
    (B) Improve power factor and provide better speed regulation
    (C) Prevent hunting in the motor
    (D) Eliminate armature reaction

3. Which of the following statements regarding two value capacitor motor is incorrect?
    (A) It is a reversing motor
    (B) It is preferred to permanent-split single-value capacitor motor where frequent reversals are required
    (C) It has low starting as well as rushing currents
    (D) It has high starting torque

4. A universal motor is one which
    (A) Can be operated either on D.C. or A.C. supply at approximately the same speed and output
    (B) Can be marketed internationally
    (C) Runs at dangerously high speed on no-load
    (D) None of these

5. Which of the following statements regarding hysteresis motor is in incorrect?
    (A) It is extremely sensitive to fluctuations in supply voltage
    (B) Its high starting torque is due to its high rotor hysteresis loss
    (C) It is extremely quiet in operation
    (D) It accelerates from rest to full-speed almost instantaneously

6. In a split phase motor, the running winding should have
    (A) High resistance and low inductance
    (B) Low resistance and high inductance
    (C) High resistance as well as high inductance
    (D) Low resistance as well as low inductance

7. In a shaded pole single-phase motor, the revolving field is produced by the use of
    (A) Inductor
    (B) Capacitor
    (C) Resistor
    (D) Shading coils

8. The direction of rotation of a hysteresis motor is determined by
    (A) Interchanging the supply leads
    (B) Position of shaded pole with respect to main pole
    (C) Retentivity of the rotor material
    (D) None of these

9. A universal motor can run on
    (A) A.C. only
    (B) D.C. only
    (C) Either A.C. or D.C.
    (D) None of the above

10. The wattage rating for a ceiling fan motor will be in the range
    (A) 200 to 250 W
    (B) 250 to 500 W
    (C) 50 to 150 W
    (D) 10 to 20 W

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