Computer Programming MCQs

5739 MCQs  (Page 61 of 574)

Attempt Computer Programming MCQs Quiz
The injected e.m.f. in the rotor of induction motor must have__________?
A. Zero frequency
B. The same frequency as the slip frequency
C. The same phase as the rotor e.m.f.
D. High value for the satisfactory speed control
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An induction motor is identical to_________?
A. D.c. compound motor
B. D.c. series motor
C. Synchronous motor
D. Asynchronous motor
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Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?
A. By changing the number of stator poles
B. Rotor rheostat control
C. By operating two motors in cascade
D. By injecting e.m.f. in the rotor circuit
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The crawling in the induction motor is caused by____________?
A. Low voltage supply
B. High loads
C. Harmonics develped in the motor
D. Improper design of the machine
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The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type__________?
A. Star connected only
B. Delta connected only
C. A. and b. both
D. None of the above
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The torque developed in the cage induction motor with autostarter is___________?
A. K/torque with direct switching
B. K x torque with direct switching
C. K2 x torque with direct switching
D. K2/torque with direct switching
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When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered__________?
A. In series
B. In parallel
C. In series-parallel
D. In parallel with stator
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It is advisable to avoid line-starting of induction motor and use starter because__________?
A. Motor takes five to seven times its full load current
B. It will pick-up very high speed and may go out of step
C. It will run in reverse direction
D. Starting torque is very high
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Stepless speed control of induction motor is possible by which of the following methods ?
A. E.m.f. injection in rotor eueuit
B. Changing the number of poles
C. Cascade operation
D. None of the above
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In the circle diagram for induction motor, the diameter of the circle represents____________?
A. Slip
B. Rotor current
C. Running torque
D. Line voltage
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Word of the Day
14 Jul
Obscenity
the state or quality of being obscene.
بےہودگی، فحاشی، بے شرمی

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