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GATE 2020: Power Systems Rapid Mini Mock

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Question 1

The system voltage is enhanced during heavy load condition and reduced during light load condition by using

Question 2

Match the items in List – I with the item in List – Ii and select the correct answer using the codes given below the lists.

Question 3

In induction type directional over current relay the driving torque is due to interaction of magnetic fields derived from

Question 4

What will be the effect on line capacitance due to the increase in spacing between the phase conductors?

Question 5

A composite conductor consists of three conductors of radius R each. The conductors are arranged as shown below. The geometric mean radius (GMR) (in cm) of the composite conductor is kR. The value of k is ______.

Question 6

The figure shows a two-generator system supplying a load of PD = 40 MW, connected at bus 2.

The fuel cost of generators G1 and G2 are:
C ­1 = 10,000 Rs / MWh and C2 = 12,500 Rs/MWh and the loss in the line is PLoss(pu) = 0.5 , where the loss coefficient is specified in pu on a 100 MVA base. The most economic power generation schedule in MW is

Question 7

The overcurrent relays for the line protection and loads connected at the buses are shown in the figure.

The relays are IDMT in nature having the characteristic

The maximum and minimum fault currents at bus B are 2000 A and 500 A respectively. Assumingthe time multiplier setting and plug setting for relay RB to be 0.1 and 5A respectively, the operatingtime of RB(in seconds) is ________

Question 8

The network shown in the following figure has impedances in p.u. as indicated. The diagonal element Y22of the bus admittance matrix ymKof the network is:

Question 9

For a single circuit transmission line delivering a load of 50 MVA at 110 KV and pf 0.8 lagging.
Given and
The sending end line voltage is ______kV.

Question 10

In a string of three identical suspension insulator units supporting a transmission line conductor, if the self-capacitance of each unit is denoted as C farads, the capacitance of each connector pin to ground can be taken as 0.1 C farads. If the maximum permissible voltage per unit is given as 20 KV then the string efficiency is

Question 11

The bus bars of each of the  two alternators of 25% reactance each are interconnected through tie-bar reactors of 10% each. What will be the equivalent impedance if a 3-phase fault occurs at any bus bar of an alternator?

Question 12

A power system consists of 300 buses out of which 20 buses are generator buses, 25 buses are the ones with reactive power support and 15 buses are the ones with fixed shunt capacitors. All the other buses are load buses. It is proposed to perform a load flow analysis for the system using Newton–Raphson method. The size of the Newton–Raphson Jacobian matrix is
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Dec 1ESE & GATE EE