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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