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Power Systems
Tough Power Systems
Quiz 1
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Q.1
An isolated generator connected to a turbine with its continuous maximum power ofMW,Hz. Generator connected with two loads of 8 MW, each operate atHz.. Generator hasdroop characteristic. If an additional load of 6 MW is added then the change in the frequency will be ____________
a) 0.25
b) 0.75
c) 0.5
d) 1
Q.2
For the given system the Ybus matrix is show below.
d) None of the mentioned
Q.3
If short TL is delivering a lagging power factor load, sending end p.f. would be ________
a) (VrcosФr+IR)/Vs
b) (VrcosФr+IRsinФr)/Vs
c) (VrsinФr+IR)/Vs
d) (VssinФr+IRcosФr)/Vs
Q.4
If all the sequence voltages at the fault point in a power system are equal, then fault is __________
a) LLG fault
b) LG fault
c) Three phase to ground fault
d) Line to Line fault
Q.5
The below mentioned graph is a recorded data of the voltage fluctuation of the network, then it can be concluded that these faults are __________
a) L-G
b) A three phase motor short
c) Feeder fault
d) Any of the mentioned
Q.6
The inertia constant of two groups of machines which do not swing together are 4 andMJ/MVA, the equivalent inertia constant of the system is _________
a) 2.85
b) 14
c) 6
d) 12
Q.7
A fault current ofpassing through the primary side of a 400/5 CT. On the secondary side an inverse time over current relay is connected whose current setting is 75%, the plug setting is __________
a) 5
b) 3.75
c) 6
d) 4
Q.8
The three phase line is working atHz with conductors rearranged as shown. The Cph of TL atkV is ___________
a) 8.75*10-9
b) 8.75*10-12
c) 26.2*10-12
d) 26.2*10-9
Q.9
For aMVA,kV three phase Alternator observes a three phase fault at terminals of it. If the fault current isA, the pu value of positive sequence reactance ______
a) 2.62
b) 0.46
c) 1.31
d) 0.92
Q.10
A lossless TL having SIL ofMW is provided with uniform distributed series capacitance compensation ofand shunt compensation ofthen the SIL of compensated TL will be _______________
a) 3949.9
b) 3289
c) 2784.9
d) 2877.6
Q.11
A lossless TL having SIL ofMW is provided with uniform distributed series capacitance compensation ofand shunt compensation ofthen the compensated impedance of TL will be(in pu) ____________
a) 0.7595
b) 2.88
c) 0.647
d) 3.27
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