Electrical Engineering MCQs

3699 MCQs  — Computer Programming MCQs  (Page 365 of 370)

Attempt Electrical Engineering Mcqs Quiz
In a substation the following equipment is not installed?
A. exciters
B. series capacitors
C. shunt reactors
D. voltatre transformers
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jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?
A. 6.6 kv (r.m.s. value)/cm
B. 11 kv (r.m.s. value)/cm
C. 22 kv (maximum value)/cm
D. 30 kv (maximum value)/cm
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Owing to skin effect:
A. current flows through the half cross-section of the conductor
B. portion of the conductor near the surface carries more current and core of the conductor carries less current
C. portion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent
D. any of the above
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By which of the following methods string efficiency can be improved?
A. using a guard ring
B. grading the insulator
C. using long cross arm
D. any of the above
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In aluminium conductors, steel core is provided to____________?
A. compensate for skin effect
B. neutralise proximity effect
C. reduce line inductance
D. increase the tensile strength
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By which of the following a bus-bar is rated?
A. current only
B. current and voltage
C. current, voltage and frequency
D. current, voltage, frequency and short time current
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A circuit is disconnected by isolators when____________?
A. line is energized
B. there is no current in the line
C. line is on full load
D. circuit breaker is not open
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Which of the following bus-bar schemes has the lowest cost?
A. ring bus-bar scheme
B. single bus-bar scheme
C. breaker and a half scheme
D. main and transfer scheme
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A conductor, due to sag between two supports, takes the form of____________?
A. semi-circle
B. triangle
C. ellipse
D. catenary
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In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________?
A. insulin
B. bitumen
C. varnish
D. no insulation is required
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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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