Single Phase Induction Motor objective question answer - ObjectiveBooks

Single Phase Induction Motor objective question answer

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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