Computer Programming MCQs

5739 MCQs  (Page 520 of 574)

Which of the following motors is preferred for boom hoist of a travelling crane ?
A. single phase motor
B. synchronous motor
C. a.c. slip ring motor
D. ward-leonard controlled d.c. shunt motor
A pony motor is used for the starting which of the following motors ?
A. squirel cage induction motor
B. schrage motor
C. synchronous motor
D. none of the above
Which of the following motors is preferred when quick speed reversal is the main consideration ?
A. squirrel cage induction motor
B. wound rotor induction motor
E. synchronous motor
D. d.c. motor
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
The characteristics of drive for crane hoisting and lowering are which of the following ?
A. precise control
B. smooth movement
C. fast speed control
D. all of the above
Heavy duty cranes are used in________________?
A. ore handling plants
B. steel plants
C. heavy engineering workshops
D. all of the above
By the use of which of the following m D.C. can be obtained from AC. ?
A. silicon diodes
B. mercury arc rectifier
C. motor generator set
D. any of the above
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