Practice Test: Question Set - 11
1. In repulsion motor direction of rotation of motor
- (A) Is opposite to that of brush shift
- (B) Is the same as that of brush shift
- (C) Is independent of brush shift
- (D) None of these
2. The range of efficiency for shaded pole motors is
- (A) 95% to 99%
- (B) 80% to 90%
- (C) 50% to 75%
- (D) 5% to 35%
3. The power factor of a single-phase induction motor is usually
- (A) Lagging
- (B) Always leading
- (C) Unity
- (D) Unity to 0.8 leading
4. In a two value capacitor motor, the capacitor used for running purposes is
- (A) Air capacitor
- (B) Paper spaced oil filled type
- (C) Ceramic type
- (D) A.C. electrolytic type
5. The speed of a universal motor is generally reduced by using
- (A) Gear trains
- (B) V-belts
- (C) Brakes
- (D) Chains
6. The electric motor used in portable drills is
- (A) Capacitor run motor
- (B) Hysteresis motor
- (C) Universal motor
- (D) Repulsion motor
7. The speed/load characteristics of a universal motor is same as that of
- (A) A.C. motor
- (B) D.C. shunt motor
- (C) D.C. series motor
- (D) None of the above
8. In repulsion motor, zero torque is developed when
- (A) Brush axis is 45° electrical to field axis
- (B) Brush axis coincides with the field axis
- (C) Brush axis is 90° electrical to field axis
- (D) Both (B) and (C)
9. Which of the following motor will give relatively high starting torque?
- (A) Capacitor start motor
- (B) Capacitor run motor
- (C) Split phase motor
- (D) Shaded pole motor
10. In a shaded pole motor, the shading coil usually consist of
- (A) A single turn of heavy wire which is in parallel
with running winding
- (B) A single turn of heavy copper wire which is
short-circuited and carries only induced current
- (C) A multilayer fine gauge copper wire in
parallel with running winding
- (D) None of the above
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