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AE 2019 || Day 14 || Power Systems Quiz 2

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Question 1

Which information is correct for miniature circuit breaker?

Question 2

The transmission line distance protection relay having the property of being inherently directional is

Question 3

The line currents of a 3-phase power supply are:
IR=3+j5A
IY=2+j2A
IB=-2-j1A
The zero sequence current will be

Question 4

If the inertia constant H= 8 MJ/MVA for a 50 MVA generator, the stored energy is

Question 5

For 800 MJ stored energy in the rotor at synchronous speed, what is the inertia constant H for a 50 Hz, four pole turbo-generator rated 100 MVA, 11 kV?

Question 6

Which type of connection is employed for current transformers for the protection of star-delta connected 3-phase transformer?

Question 7

A power station has a maximum demand of 15000 kW. The annual load factor is 50% and plant capacity factor is 40%. What is the reserve capacity of the plant?

Question 8

In a ACSR conductor why is grease put between steel and aluminium conductors?

Question 9

A 10 kVA, 400 V/200 V single-phase transformer with 10% impedance, draws a steady short circuit current of

Question 10

Two power stations S1 and S2 are interconnected through a transmission lineof per unit (p.u.) reactance of 0.4 station S1 has one generator of p.u. reactance of 0.2 and station S2 has two generators of p.u. reactance 0.4 each.

For a 3-phase symmetrical short circuit at the middle of the transmission line (point F). What is the change in the value of the equivalent fault reactance, with one of the generators os S2 removed?
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Jun 8ESE & GATE EE