Computer Programming MCQs

5739 MCQs  (Page 525 of 574)

Which of the following motors is preferred for traction work ?
A. universal motor
B. d.c. series motor
C. synchronous motor
D. three-phase induction motor
The selection of an electric motor for any application depends on which of the following factors ?
A. electrical characteristics
B. mechanical characteristics
C. size and rating of motors
D. cost
Light duty cranes are used in which of the following ?
A. power houses
B. pumping stations
C. automobile workshops
D. all of the above
________________is preferred for automatic drives?
A. squirrel cage induction motor
B. synchronous motors
C. ward-leonard controlled d.c. motors
D. any of the above
Which of the following motors are pre-ferred for overhead travelling cranes ?
A. Slow speed motors
B. Continuous duty motors
C. Short time rated motors
D. None of the above
The rate of acceleration on suburban orurban service is in the range_________________?
A. 0.2 to 0.5 km phps
B. 1.6 to 4.0 km phps
C. 5 to 10 km phps
D. 15 to 25 km phps
The braking retardation is usually in the range__________________?
A. 0.15 to 0.30 km phps
B. 0.30 to 0.6 km phps
C. 0.6 to 2.4 km phps
D. 3 to 5 km phps