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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