Practice Test: Question Set - 04
1. Which of the following motors is used for elevators?
- (A) Induction
motor
- (B) Synchronous
motor
- (C) Capacitor
start single phase motor
- (D) Any of the
above
2. Light duty cranes are used in which of the following?
- (A) Power
houses
- (B) Pumping
stations
- (C) Automobile
workshops
- (D) All of the
above
3. For blowers which of the following motor is preferred?
- (A) D.C. series
motor
- (B) D.C. shunt
motor
- (C) Squirrel
cage induction motor
- (D) Wound rotor
induction motor
4. For derris and winches which of the following drives can be used?
- (A) Pole
changing squirrel cage motors
- (B) D.C. motors
with Ward-Leonard control
- (C) A.C. slip
ring motors with variable resistance
- (D) Any of the
above
5. For crane travel which of the following motors is normally used?
- (A) Synchronous
motor
- (B) D.C.
differentially compound motor
- (C) Ward-Leonard
controlled D.C. shunt motor
- (D) AC. slip
ring motor
6. Which of the following alternatives will be cheaper?
- (A) A
100 H.P. AC. three phase motor
- (B) Four motors
of 25 H.P. each
- (C) Five motors
of 20 H.P. each
- (D) Ten motors
of 10 H.P. each
7. Which of the following happens when star-delta starter is used?
- (A) Starting
voltage is reduced
- (B) Starting
current is reduced
- (C) Both (A) and
(B)
- (D) None of the
above
8. In case of __________ speed control by injecting e.m.f. in the rotor circuit is possible,
- (A) D.C. shunt
motor
- (B) Schrage
motor
- (C) Synchronous
motor
- (D) Slip ring
induction motor
9. For a motor-generator set which of the following motors will be preferred?
- (A) Synchronous
motor
- (B) Slip ring
induction motor
- (C) Pole
changing induction motor
- (D) Squirrel
cage induction motor
10. Which of the following motors are best for the rolling mills?
- (A) Single phase
motors
- (B) Squirrel
cage induction motors
- (C) Slip
ring induction motors
- (D) D.C. motors
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