Objective Type Questions on Industrial Drives - Set 06 - ObjectiveBooks

Objective Type Questions on Industrial Drives - Set 06

Practice Test: Question Set - 06

1. While selecting motor for an air conditioner which of the following characteristics is of great importance?
    (A) Type of bearings
    (B) Type of enclosure
    (C) Noise
    (D) Arrangement for power transmission

2. Which of the following motors always starts on load?
    (A) Conveyor motor
    (B) Floor mill motor
    (C) Fan motor
    (D) All of the above

3. A reluctance motor
    (A) Is provided with slip rings
    (B) Requires starting gear
    (C) Has high cost
    (D) Is compact

4. Which of the following motors is preferred when smooth and precise speed control over a wide range is desired?
    (A) D.C. motor
    (B) Squirrel cage induction motor
    (C) Wound rotor induction motor
    (D) Synchronous motor

5. Belted slip ring induction motor is almost invariably used for
    (A) Water pumps
    (B) Jaw crushers
    (C) Centrifugal blowers
    (D) None of the above

6. Short time rated motors are preferred for overhead traveling cranes
    (A) True
    (B) False

7. Flame proof motors are used in
    (A) Paper mills
    (B) Steel mills
    (C) Moist atmospheres
    (D) Explosive atmospheres

8. When the load is above _________ a synchronous motor is found to be more economical.
    (A) 2 kW
    (B) 20 kW
    (C) 50 kW
    (D) 100 kW

9. Is not a part of ball bearing?
    (A) Inner race
    (B) Outer race
    (C) Cage
    (D) Bush

10. The diameter of the rotor shaft for an electric motor depends on which of the following?
    (A) r.p.m. only
    (B) Horse power only
    (C) Horse power and r.p.m.
    (D) Horse power, r.p.m. and power factor

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