Computer Programming MCQs

5739 MCQs  (Page 521 of 574)

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In ______________ the speed can be varied by changing the position of brushes?
A. slip ring motor
B. schrage motor
C. induction motor
D. repulsion motor
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Battery operated scooter for braking uses________________?
A. plugging
B. mechanical braking
C. regenerative braking
D. rheostatic braking
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In ________________ method of staging three phase induction motors the starting voltage is not reduced?
A. auto-transformer
B. star-delta
C. slip ring
D. any of the above
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_______________has the least value of starting torque to full load torque ratio?
A. d.c. shunt motor
B. d.c. series motor
C. squirrel cage induction motor
D. slip ring induction motor
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In which of the following applications variable speed operation is preferred ?
A. exhaust fan
B. ceiling fan
C. refrigerator
D. water pump
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Which of the following machines has heavy fluctuation of load ?
A. printing machine
B. punching machine
C. planer
D. lathe
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Battery operated scooter for braking uses__________________?
A. plugging
B. mechanical braking
C. regenerative braking
D. rheostatic braking
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In which of the following applications the load on motor changes in cyclic order ?
A. electric shovels
B. cranes
C. rolling mills
D. all of the above
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For derries and winches which of the following drives can be used ?
A. pole changing squirrel cage motors
B. d.c. motors with ward-leonard con-trol
C. a.c. slip ring motors with variable resistance
D. any of the above
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___________________has least range of speed control?
A. slip ring induction motor
B. synchronous motor
C. d.c. shunt motor
D. schrage motor
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Word of the Day
16 Jul
Volatile
(of a substance) easily evaporated at normal temperatures.
بدلتے مزاج والا، کافور صفت

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