Electrical Industrial Drives Objective Questions - Set 05 - ObjectiveBooks

Electrical Industrial Drives Objective Questions - Set 05

Practice Test: Question Set - 05


1. Which part of a motor needs maximum attention for maintenance?
    (A) Frame
    (B) Rearing
    (C) Stator winding
    (D) Rotor winding

2. While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance?
    (A) Running characteristics
    (B) Starting characteristics
    (C) Efficiency
    (D) Braking

3. The selection of an electric motor for any application depends on which of the following factors?
    (A) Electrical characteristics
    (B) Mechanical characteristics
    (C) Size and rating of motors
    (D) All of the above

4. ________ need frequent starting and stopping of electric motors,
    (A) Paper mills
    (B) Grinding mills
    (C) Air-conditioners
    (D) Lifts and hoists

5. Rotor of a motor is usually supported on _________ bearings.
    (A) Ball or roller
    (B) Needle
    (C) Bush
    (D) Thrust

6. In _________ method of staging three phase induction motors the starting voltage is not reduced.
    (A) Autotransformer
    (B) Star-delta
    (C) Slip ring
    (D) Any of the above

7. Heavy duty cranes are used in
    (A) Ore handling plants
    (B) Steel plants
    (C) Heavy engineering workshops
    (D) All of the above

8. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
    (A) Slop speed operation
    (B) High starting torque
    (C) Low windage losses
    (D) All of the above

9. Is preferred for automatic drives.
    (A) Squirrel cage induction motor
    (B) Synchronous motors
    (C) Ward Leonard controlled D.C. motors
    (D) Any of the above

10. In series motor which of the following methods can be used for changing the flux per pole?
    (A) Tapped field control
    (B) Diverter field control
    (C) Series-parallel control
    (D) Any of the above

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