Industrial Drives Objective Questions - Set 02 - ObjectiveBooks

Industrial Drives Objective Questions - Set 02

Practice Test: Question Set - 02


1. Which of the following types of motor enclosure is safest?
    (A) Totally enclosed
    (B) Totally enclosed fan cooled
    (C) Open type
    (D) Semi closed

2. Which of the following motors is preferred for boom hoist of a traveling crane?
    (A) Single phase motor
    (B) Synchronous motor
    (C) A.C. slip ring motor
    (D) Ward-Leonard controlled D.C. shunt motor

3. The traveling speed of cranes varies from
    (A) 20 to 30 m/s
    (B) 10 to 15 m/s
    (C) 5 to 10 m/s
    (D) 1 to 2.5 m/s

4. ________ has least range of speed control.
    (A) Slip ring induction motor
    (B) Synchronous motor
    (C) D.C. shunt motor
    (D) Schrage motor

5. In squirrel cage induction motors which of the following methods of starting cannot be used?
    (A) Resistance in rotor circuit
    (B) Resistance in stator circuit
    (C) Autotransformer starting
    (D) Star-delta starting

6. Reluctance motor is a
    (A) Variable torque motor
    (B) Low torque variable speed motor
    (C) Self starting type synchronous motor
    (D) Low noise, slow speed motor

7. In a paper mill where constant speed is required
    (A) Synchronous motors are preferred
    (B) A.C. motors are preferred
    (C) Individual drive is preferred
    (D) Group drive is preferred

8. Which feature, while selecting a motor for centrifugal pump, will be of least significance?
    (A) Starting characteristics
    (B) Operating speed
    (C) Horse power
    (D) Speed control

9. Which of the following motors are preferred for overhead traveling cranes?
    (A) Slow speed motors
    (B) Continuous duty motors
    (C) Short time rated motors
    (D) None of the above

10. For a particular application the type of electric and control gear are determined by which of the following considerations?
    (A) Starting torque
    (B) Conditions of environment
    (C) Limitation on starting current
    (D) All of the above

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