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MCQs 1: By which of the following methods string efficiency can be improved?

Using a guard ring Grading the insulator Using long cross arm Any of the above None of the above
Answer Explanation

MCQs 2: Owing to skin effect:

current flows through the half cross-section of the conductor portion of the conductor near the surface carries more current and core of the conductor carries less current portion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent any of the above none of the above
Answer Explanation

MCQs 3: Which of the following bus-bar schemes has the lowest cost?

Ring bus-bar scheme Single bus-bar scheme Breaker and a half scheme Main and transfer scheme
Answer Explanation

MCQs 4: In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________?

insulin bitumen varnish no insulation is required
Answer Explanation

MCQs 5: A conductor, due to sag between two supports, takes the form of____________?

semi-circle triangle ellipse catenary
Answer Explanation

MCQs 6: Transmission voltage of 11 kV is normally used for distances up to_____km?

20—25 km 40—50 km 60—70 km 80—100 km
Answer Explanation

MCQs 7: Which of the following characteristics should the line supports for transmission lines possess?

Low cost High mechanical strength Longer life All of the above
Answer Explanation

MCQs 8: Which of the following distribution systems is more reliable?

Radial system Tree system Ring main system All are equally reliable
Answer Explanation

MCQs 9: The steel used in steel cored conductors is usually__________?

alloy steel stainless steel mild steel high speed steel all of the above
Answer Explanation

MCQs 10: Which of the following relays is used on long transmission lines?

Impedance relay Mho’s relay Reactance relay None of the above
Answer Explanation

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