GATE 2022 : Power System Revision Quiz for ESE & GATE EE Exams

Question 1

The total connected load is the sum of the continuous rating of the entire load connected to the system. The total connected load is:

Question 2

If the capacity is doubled and voltage are tripled, then percentage change in p.u. reactance is?

Question 3

For a constant load having load angle of 30

if the excitation of the alternator is increased by 30% then calculate the new load angle for this system?

Question 4

For what purpose is graphite used in a nuclear power plant?

Question 5

Assume a 275 kV transmission line having the following line constants:A = 0.8∠5° ; B = 200∠75°.
If a load is connected at receiving end at unity power factor but maintaining the same voltage profile. Then _________ compensation will be needed at ______

Question 6

A 3-

, 400 KV transmission line has Z_S = 400 Ω. If the line is compensated with series capacitor and shunt reactor of 30% and 20% respectively, then the new values of surge impedance and surge impedance loading are :

Question 7

Two generators are supplying a common load of 1000 MW. The incremental cost curves in Rs/MWhr for both generators are shown in figure. The maximum and minimum generation limits are also indicated. The optimum generation schedule is:

Question 8

A synchronous generator rated 400 kVA, 400 V, 0.2 p.u. sub transient reactance is supplying a passive load of 200 kW at 0.8 lagging power factor. If a three-phase fault occurs at generator terminals, then the magnitude of initial symmetrical fault current is:

Question 9

A balance abc-sequence Y-connected source with V_an = 100 ∠10°V is connected to a Δ-connected balanced load (8 + j4)Ω per phase. The line current I_c is

Question 10

Consider a 2-wire DC ring distribution system shown below, Value of I₁ will be ____Amp.

Question 11

What will be the magnitude of generator terminal voltage (in pu) if the generator terminal base values are 100 MVA and 15 kV for the given below single line diagram network ?

Question 12Multiple Correct Options

For 50 MVA, 11 kV, Three-phase alternator, for which neutral is solidly grounded. Consider: 3-phase fault = 2 kA, L-L fault = 2.6 kA, L-G fault = 4.2 kA . Then choose the correct option(s):

Question 13Multiple Correct Options

Consider percentage differential relay protecting a 3-phase power transformer (Δ/Y). If CT is placed on delta & star side of power transformer is 300/5 A and 2200/5 A respectively, then which of the following option(s) are correct. (Take rating of transformer as 50 MVA, 132/33 kV).

Question 14

A 3-Phase 220 KV 50 Hz transmission line has conductors arranged in the form of an equilateral triangle in such a way that capacitance per phase is 10 nf/km. If the distance between capacitance increased to twice of previous distance, the new value of capacitance per phase is_____ nf/km (up to 2 decimals)

Question 15

A 3-Փ, 420 kV, 50Hz transmission line of 450 km length is assumed to be lossless. The line is energized with 420 kV at sending end. When load is removed, the receiving end voltage is 700 kV. The phase constant of line ____ (in rad/km).