A. electromagnetic induction
B. varying the resistance
C. varying the reactance
D. variable transformer
Related Mcqs:
- The voltage drop, for constant voltage transmission is compensated by installing__________?
A. inductors
B. capacitors
C. synchronous motors
D. all of above
E. none of the above - The operating voltage of high voltage cables is up to_______________?
A. l.lkV
B. 3.3kV
C. 6.6kV
D. llkV - Constant voltage transmission entails the following disadvantage?
A. large conductor area is required for same power transmission
B. short-circuit current of the system is increased
C. either of the above
D. none of the above - 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 operating voltage of supertension cables is up to_________________?
A. 3.3 kV
B. 6.6 kV
C. 11 kV
D. 33 kV - The voltage of the single phase supply to residential consumers is_____________?
A. 110 V
B. 210 V
C. 230 V
D. 400 V - The material commonly used for insulation in high voltage cables is_______________?
A. lead
B. paper
C. rubber
D. none of the above - The material generally used for armour of high voltage cables is_____________?
A. aluminium
B. steel
C. brass
D. copper - 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 - As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only__________________?
A. 31.25 percent of copper
B. 33.3 percent of copper
C. 66.7 percent of copper
D. 125 percent of copper