Induction Motor MCQs with Answers - Set 02 - ObjectiveBooks

Induction Motor MCQs with Answers - Set 02

Practice Test: Question Set - 02

1. Reduced voltage starter can be used with
    (A) Slip ring motor only but not with squirrel cage induction motor
    (B) Squirrel cage induction motor only but not with slip ring motor
    (C) Squirrel cage as well as slip ring induction motor
    (D) None of the above

2. Insertion of resistance in the stator of an induction motor
    (A) Increases the load torque
    (B) Decreases the starting torque
    (C) Increases the starting torque
    (D) None of the above

3. The injected e.m.f. in the rotor of induction motor must have
    (A) Zero frequency
    (B) The same frequency as the slip frequency
    (C) The same phase as the rotor e.m.f.
    (D) High value for the satisfactory speed control

4. Star-delta starting of motors is not possible in case of
    (A) Single phase motors
    (B) Variable speed motors
    (C) Low horse power motors
    (D) High speed motors

5. Which of the following component is usually fabricated out of silicon steel?
    (A) Bearings
    (B) Shaft
    (C) Stator core
    (D) None of the above

6. In three-phase squirrel-cage induction motors
    (A) Rotor conductor ends are short-circuited through slip rings
    (B) Rotor conductors are short-circuited through end rings
    (C) Rotor conductors are kept open
    (D) Rotor conductors are connected to insulation

7. In an induction motor the relationship between stator slots and rotor slots is that
    (A) Stator slots are equal to rotor slots
    (B) Stator slots are exact multiple of rotor slots
    (C) Stator slots are not exact multiple of rotor slots
    (D) None of the above

8. The starting torque of a 3 phase squirrel cage induction motor is
    (A) Twice the full load torque
    (B) 1.5 times the full load torque
    (C) Equal to full load torque
    (D) Any of the above

9. The stating torque of the slip ring induction motor can be increased by adding
    (A) External inductance to the rotor
    (B) External resistance to the rotor
    (C) External capacitance to the rotor
    (D) Both resistance and inductance to rotor

10. In an induction motor if air-gap is increased
    (A) The power factor will be low
    (B) Windage losses will be more
    (C) Bearing friction will reduce
    (D) Copper loss will reduce in an induction motor

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