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GATE 2019: Power Systems Rapid Quiz 2

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Question 1

In a nuclear power plant, moderator and control rods are employed to control the chain reaction of neutrons. How can the chain reaction be stopped?

Question 2

In a thermal power plant, an alternator with 30 poles is installed. In order to generate voltage at 50 Hz, the turbine must run at what speed?

Question 3

In capacitance grading, three dielectric materials with permittivities

are placed as shown below.

Which of the following condition is true, when all the dielectric materials are subjected to same maximum stress?

Question 4

A 3-phase, 50Hz, 25kV generator feeds through a line having transfer impedance of j0.908Ω/ph, an infinite bus also at 25kV. Find the maximum steady state power transfer for the base of 1000MW?

Question 5

A alternator is initially delivering 1.2pu power to an infinite bus at an angle of

.The alternator is having back emf (E) of 1.1∠δ and impedance of 0.25pu connected to an infinite bus operating at V=1∠0 through transformer having reactance 0.1pu and a double circuit line with reactance Xpu/line. If one of the double circuit line is removed suddenly by opening the CB, then find the find the value of reactance (pu) of line to maintain the stability.

Question 6

An alternator delivers 1pu power operating at 50 Hz to an infinite bus through a transmission circuit having negligible resistance. A fault occurs reducing the maximum power transferrable to 0.75pu. Before the occurrence of fault the power was 2pu and after the fault clearance it is 1.25pu. Find the critical clearing angle in degree?

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ESE & GATE EE Power Systems

Nov 19ESE & GATE EE