Electrical Engineering MCQs

3699 MCQs  — Computer Programming MCQs  (Page 362 of 370)

Attempt Electrical Engineering Mcqs Quiz
To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them?
A. Just ahead of magnetic neutral axis
B. In magnetic neutral axis
C. Just behind the magnetic neutral axis
D. None
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In a D.C. generator the critical resistance refers to the resistance of_____________?
A. Brushes
B. Field
C. Armature
D. Load
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When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?
A. current will flow to earth
B. supply voltage will drop
C. supply voltage will increase
D. no current will flow in the conductor
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Flashing the field of D.C. generator means:______________?
A. Neutralising residual magnetism
B. Creating residual magnetism by a d.c. source
C. Making the magnetic losses of forces parallel
D. Increasing flux density by adding extra turns of windings on poles
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The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?
A. 640 v
B. 620 v
C. 600 v
D. 580 v
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When a conductor carries more current on the surface as compared to core, it is due to___________?
A. permeability variation
B. corona
C. skin effect
D. unsymmetrical fault
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The following system is not generally used?
A. 1-phase 3 wire
B. 1-phase 4 wire
C. 3-phase 3 wire
D. 3-phase 4 wire
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The skin effect of a conductor will reduce as the__________?
A. resistivity of conductor material increases
B. permeability of conductor material increases
C. diameter increases
D. frequency increases
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Electro-mechanical voltage regulators are generally used in___________?
A. reactors
B. generators
C. transformers
D. all of the above
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Series capacitors on transmission lines are of little use when the load VAR requirement is___________?
A. large
B. small
B. fluctuating
D. any of the above
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Word of the Day
12 Jul
Obdurate
stubbornly refusing to change one’s opinion or course of action.
ضدی، بدکار، سنگدلی

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