Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is____________________?
(A) 25 percent
(B) 50 percent
(C) 75 percent
(D) 100 percent
Large industrial consumers are supplied electrical energy at__________________?
(A) 400 V
(B) 11 kV
(C) 66 kV
(D) 400 kV
The spacing between phase conductors of a 220 kV line is approximately equal to________________?
(A) 2 m
(B) 3.5 m
(C) 6 m
(D) 8.5 m
In fuel cell, the ___________ energy is converted into electrical energy?
(A) mechanical
(B) chemical
(C) heat
(D) sound
The main source of production of biogas is__________________?
(A) human waste
(B) wet cow dung
(C) wet livestock waste
(D) all above
The proper indication of incomplete combustion is_______________?
(A) high CO content in flue gases at exit
(B) high CO2 content in flue gases at exit
(C) high temperature of flue gases
(D) the smoking exhaust from chimney
The commercial sources of energy are____________?
(A) solar, wind and biomass
(B) fossil fuels, hydropower and nuclear energy
(C) wood, animal wastes and agriculture wastes
(D) none of the above
A 3-phase 4 wire system is commonly used on________________?
(A) primary transmission
(B) secondary transmission
(C) primary distribution
(D) secondary distribution