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GATE 2019: Power System Test 10
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Question 1
Which of the following contribute to the increase in electrical stiffness of an alternator connected to a very large grid?
1. Increasing the excitation of machine
2. Decreasing the power angle of machine
3. Reducing the excitation of machine
4. Reducing the reactance of machine
1. Increasing the excitation of machine
2. Decreasing the power angle of machine
3. Reducing the excitation of machine
4. Reducing the reactance of machine
Question 2
If the power angle charcateristics of a machine connected to infinite bus is given by
It is operating at δ = 300. Which of the foolowing is synchronising power coefficient at the operating point?
It is operating at δ = 300. Which of the foolowing is synchronising power coefficient at the operating point?
Question 3
A 100 MVA synchronous generator operates on full load at a frequency of 50 Hz. The load is suddenly reduced to 50 MW. Due to time lag in governor system, the steam valve begins to close after 0.4 second. The change in frequency that occurs in this time will be
[H = 5 kW-s/KVA of generator capacity]
[H = 5 kW-s/KVA of generator capacity]
Question 4
A balanced delta connected load of 
Ω per phase is connected to a 400 V, 50 Hz, 3–phase supply lines. If the input power factor is to be improved to 0.9 by connecting a bank of star connected capacitors the required kVAR of the bank is
Ω per phase is connected to a 400 V, 50 Hz, 3–phase supply lines. If the input power factor is to be improved to 0.9 by connecting a bank of star connected capacitors the required kVAR of the bank isQuestion 5
A 3–phase, 11–kV generator feeds power to a constant power unity power factor load of 100 MW through a 3–phase transmission line. The line–to–line voltage at the terminals of the machine is maintained constant at 11 kV. The per unit positive sequence impedance of the line based on 100 MVA and 11 kV is j 0.2. The line–to–line voltage at the load terminals is measured to be less than 11 kV. The total reactive power to be injected at the terminals of the load to increase the line–to–line voltage at the load terminals to 11 kV is
Question 6
The synchronous generator is delivering 1.0 pu of power to an infinite bus. Infinite bus voltage is 1.1 pu. Generator is connected to infinite bus through a lossless transmission line. A circuit breaker is connected near to generator terminal and the critical clearing time of circuit breaker is 0.34 sec. if another identical synchronous generator is connected in parallel to the exciting generator and each generator is scheduled to supply 0.5 per unit of power, then the critical clearing time (in sec) of the circuit breaker will –
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Jun 20ESE & GATE EE
