Computer Programming MCQs

5739 MCQs  (Page 90 of 574)

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In a synchronous motor, V-curves represent relation between____________?
A. Armature current and field current
B. Power factor and speed
C. Field current and speed
D. Field current and power factor
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In a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and load torque all are halved. The motor speed will be____________?
A. 3000 r.p.m.
B. 1500 r.p.m.
C. 750 r.p.m.
D. None of the above
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In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then
A. The motor is said to be fully loaded
B. The torque generated is maximum
C. The excitation is said to be zero per cent
D. The excitation is said to be hundred per cent
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In a synchronous motor, the damping winding is generally used to______________?
A. Reduce nosie level
B. Reduce the eddy currents
C. Provide starting torque only
D. Prevent hunting and provide the starting torque
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If the field of a synchronous motor is underexcited, the power factor will be_____________?
A. Zero
B. Unity
C. Lagging
D. Leading
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The back e.m.f. in the stator of a synchronous motor depends on____________?
A. Number of poles
B. Flux density
C. Rotor speed
D. Rotor excitation
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In a synchronous motor, the armature current has large values for____________?
A. High excitation only
B. Low excitation only
C. Both high and low excitation
D. None of the above
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Which of the following losses, in a synchronous motor, does not vary with load?
A. Windage loss
B. Copper losses
C. Any of the above
D. None of the above
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The size of a synchronous motor decreases with the increase in___________?
A. Flux density
B. Horse power rating
C. Speed
D. All of the above
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Which of the following losses is not dissipated by the stator core surface in a synchronous motor?
A. Eddy current losses in the conductors
B. Iron losses in the stator
C. Copper losses in the slot portion of the conductors
D. Windage losses
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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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