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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