When an alternator connected to the bus-bar is shut down the bus-bar voltage will___________?
(A) fall
(B) rise
(C) remain unchanged
(D) none of the above
The frequency of voltage generated, in case of generators, can be increased by___________?
(A) using reactors
(B) increasing the load
(C) adjusting the governor
(D) reducing the terminal voltage
(D) none of the above
When the interconnector between two stations has large reactance?
(A) the transfer of power will take place with voltage fluctuation and noise
(B) the transfer of power will take place with least loss
(C) the stations will fall out of step be¬cause of large angular displacement between the stations
(D) none of the above
In the analysis of which of the following lines shunt capacitance is neglected?
(A) Short transmission lines
(B) Medium transmission lines
(C) Long transmission lines
(D) Medium as well as long transmission lines
For transmission of power over a distance of 500 km, the transmission voltage should be in the range?
(A) 150 to 220 kV
(B) 100 to 120 kV
(C) 60 to 100 kV
(D) 20 to 50 kV
The effect of corona can be detected by___________?
(A) presence of ozone detected by odour
(B) hissing sound
(C) faint luminous glow of bluish colour
(D) all of the above
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
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
(D) none of the above
Overhead system can be designed for operation up to____________?
(A) 11 kV
(B) 33 kV
(C) 66 kV
(D) 400 kV
The underground system cannot be operated above_________________?
(A) 440 V
(B) 11 kV
(C) 33 kV
(D) 66 kV