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GATE EE 2021 : Power System Quiz 8 (App update required to attempt this test)
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Question 1
An alternator of E = 1.5 p.u. and Xg = 1 p.u. is connected to an infinite bus (V = 1 p.u.). Power delivered by the alternator to the infinite bus is 0.5 p.u. Now, the steam input to the alternator is suddenly increased to 1 p.u. and remains stable. Calculate the change in torque angle?
Question 2
Suppose in a network of 400 kV Bus only 380 kV is recorded. Now what will be the reactive power absorbed by shunt reactor in MVAR, if a 60 MVAR, 400 kV shunt reactor is connected to the bus_______MVAR.
Question 3
In the figure shown below, the system is operating at 50 Hz. The value of H = 4.2 MW-sec/MVA. The generator is loaded to 80% of its maximum limit. The frequency of natural oscillations for small disturbance is _________Hz.
Question 4
Find the steady state power transfer limit of a system consisting of generator equivalent reactance 0.4 p.u. connected to an infinite bus through a series reactance of 1.2 p.u. The terminal voltage of the generator is held at 1.20 p.u. and the voltage of infinite bus is 1 p.u.
Question 5
There are two generators in a power system. No-load frequencies of the generators are 51.5 Hz and 51Hz, respectively, and both are having droop constant of 1 Hz/MW. Total load in the system is 2.5 MW. Assuming that the generators are operating under their respective droop characteristics, the frequency of the power system in Hz in the steady state is __________.
Question 6
A synchronous generator with excitation voltage Ef = 1.4 pu connected to an infinite bus. The generator has a synchronous reactance of 0.8 pu and it is delivering power (P) of 0.5 pu to the bus at load angle (δ = 30 °). Assuming infinite bus voltage be 1 pu. The reactive power(Q) in pu supplied by the generator (Neglect stator resistance) ______.
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Sep 18ESE & GATE EE
