BEE FREE Bachelor of Electrical Engineering Power System Questions and Answers 2

Question 1

What is the primary purpose of a bus bar in a power system substation?

Accepted Answer

To collect and distribute electrical power to multiple circuits

Answer

To convert AC power to DC power

Answer

To store electrical energy during peak demand

Answer

To regulate voltage at the consumer end

Question 2

In a three-phase power system, what happens to the line voltage relative to the phase voltage in a delta-connected generator?

Accepted Answer

Line voltage equals phase voltage

Answer

Line voltage is √3 times phase voltage

Answer

Line voltage is half the phase voltage

Answer

Line voltage is twice the phase voltage

Question 3

Which type of fault in a power system is generally the most severe in terms of fault current magnitude?

Accepted Answer

Three-phase symmetrical fault

Answer

Single line-to-ground fault

Answer

Line-to-line fault

Answer

Double line-to-ground fault

Question 4

What does the term 'power factor correction' primarily aim to achieve in an industrial power system?

Accepted Answer

Reduce reactive power demand and minimize current drawn from the supply

Answer

Increase the total active power consumed by loads

Answer

Eliminate harmonic distortion in the supply voltage

Answer

Boost the supply voltage at the point of common coupling

Question 5

In the per-unit system used for power system analysis, what is the per-unit value of a quantity equal to its base value?

Accepted Answer

1.0 per unit

Answer

0 per unit

Answer

100 per unit

Answer

It depends on the system voltage level

Question 6

What is the main advantage of using HVDC transmission over HVAC for very long distance power transfer?

Accepted Answer

Lower transmission losses due to absence of reactive power losses and skin effect

Answer

Easier voltage transformation at substations

Answer

Simpler protection and switchgear requirements

Answer

Lower initial installation cost for all distances