page 1 | Power Systems Multiple Choice Questions

Q11. Power Factor correcting element is generally connected in....

series with load

parallel to the load

series with source

parallel to source

Q12. Electricity supply systems are invariably three-phase and they are so designed and loaded that the operation is

Star connected

Balanced 3 phase

Unbalanced three phase

Delta connected

Q13. For a transmission line with resistance ‘R’ and reactance ‘X’ and negligible capacitance generalized constant ‘A’ is:

1

R – jX

R + jX

0

Q14. Bundled conductors are used in transmission lines in order to,

Reduce corona loss and to increase the inductance of line

Reduce corona loss and to decrease the inductance of lines

Decrease the GMD (mutual) of line

Decrease the GMD (self) of lines

Q15. The inductance of a transmission line is minimum when

GMD is high

GMR is high

Both GMD and GMR are high

GMD is low and GMR is high

Q16. Which of the following is NOT an advantages of bundled conductor?

Reduced the voltage gradient

Reduced corona loss

Reduced GMD

Reduced Surge impedance

Q17. Skin effect depends on

Frequency

Relative permeability

Conductivity

All of the above

Q18. The skin effect in conductor results in

increase in dc resistance

decrease in ac resistance

increase in ac resistance

decrease in dc resistance

Q19. A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the load for achieving maximum voltage regulation?

0.6 lag

0.8 lag

0.6 lead

0.8 lead

Q20. For a long distance HV transmission line the receiving end voltage under unloaded condition is

Much lower than

Lower than

Equal to

Higher than the sending end voltage

MCQ

POWER SYSTEM