A booster is a_________________? - PakMcqs

Related Mcqs:

1. Which of the following relays is used on long transmission lines?

   A. Impedance relay B. Mho’s relay C. Reactance relay D. None of the above...

2. In aluminium conductors, steel core is provided to____________?

   A. compensate for skin effect B. neutralise proximity effect C. reduce line inductance D. increase the tensile strength...

3. jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?

   A. 6.6 kV (r.m.s. value)/cm B. 11 kV (r.m.s. value)/cm C. 22 kV (maximum value)/cm D. 30 kV (maximum value)/cm...

4. 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...

5. The angular displacement between two interconnected stations is mainly due to___________?

   A. armature reactance of both alternators B. reactance of the interconnector C. synchronous reactance of both the alternators D. all of the above...

6. 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...

7. 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...

8. Which of the following is the demerit of a ‘constant voltage transmission system’ ?

   A. Increase of short-circuit current of the system B. Availability of steady voltage at all loads at the line terminals C. Possibility of better protection for the line due to possible use of higher terminal reactants D. Improvement of power factor at times of moderate and heavy loads E. Possibility of carrying increased power for...

9. In transmission lines the cross-arms are made of________________?

   A. copper B. wood C. R.C.C. D. steel...

10. 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...