MCQs of Electrical Supply Systems (Power System - I - 3140914)

Power System - I (3140914) MCQs

MCQs of Electrical Supply Systems

Showing 31 to 40 out of 69 Questions

31.

Underground system cannot be operated above

(a)	220 kV
(b)	66 kV
(c)	33 kV
(d)	11 kV

32.

Transmission of power by AC cable is impossible beyond

(a)	40 km
(b)	400 km
(c)	200 km
(d)	1000 km

33.

By increasing the transmission voltage to double of its original value the same power can be dispatched keeping the line loss

(a)	Equal to original value
(b)	Half the original value
(c)	Double the original value
(d)	One fourth of original value

34.

For the same voltage drop, increasing the voltage of a distributor n-times

(a)	Reduces the cross section of the conductor
(b)	Increases the cross section of the conductor
(c)	Reduces the cross section of conductor n² times
(d)	Increases the cross section of conductor n² times

35.

In a transmission system, the weight of copper used is proportional to

(a)	Voltage²
(b)	Voltage
(c)	1/ Voltage²
(d)	1/ Voltage

36.

Volume of copper required for an AC transmission line is inversely proportional

(a)	Current
(b)	Voltage
(c)	Power factor
(d)	All of above

37.

If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to annual cost of electrical energy wasted in the conductor, the total annual cost is minimum and the corresponding size of conductor is the most economical. This statement is known as

(a)	Lenz’s law
(b)	Kelvin’s law
(c)	Faraday’s law
(d)	Ohm’s law

38.

The main criteria for selection of the size of distributor for a radial distribution system is

(a)	Voltage drop
(b)	Corona loss
(c)	Temperature rise
(d)	Capital cost

39.

Which of the following DC distribution system is the simplest and cheapest in first cost?

(a)	Radial
(b)	Ring main
(c)	Interconnected
(d)	None of above

40.

Which distribution system is more reliable?

(a)	Ring main system
(b)	Tree system
(c)	Radial system
(d)	All of above

Showing 31 to 40 out of 69 Questions