511. 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
E. none of the above
512. 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
513. 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
514. 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
E. None of the above
515. By which of the following systems electric power may be transmitted ?
A. Overhead system
B. Underground system
C. Both A. and (b)
D. None of the above
516. _______________are the conductors, which connect the consumer’s terminals to the distribution?
A. Distributors
B. Service mains
C. Feeders
D. None of the above
517. The underground system cannot be operated above_________________?
A. 440 V
B. 11 kV
C. 33 kV
D. 66 kV
518. Overhead system can be designed for operation up to____________?
A. 11 kV
B. 33 kV
C. 66 kV
D. 400 kV
519. If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as___________________?
A. Kelvin’s law
B. Ohm’s law
C. Kirchhoffs law
D. Faraday’s law
E. none of the above
520. The wooden poles well impregnated with creosite oil or any preservative compound have life_____________?
A. from 2 to 5 years
B. 10 to 15 years
C. 25 to 30 years
D. 60 to 70 years
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