Q.1 A power system will have greater flexibility of operation if they have __________.
A. Only Peak load plants operating in combination
B. Only Base load plants operating in combination
C. Only thermal power plants operating in combination
D. Various types of power plants operating in combination
Ans : Various types of power plants operating in combination
Q.2 For a given power system, its zero and maximum regulation will occur at the impedance angle of
Ans : 45
Q.3 A 200 bus power system has 160 PQ bus. For achieving a load flow solution by N-R in polar coordinates, the minimum number of simultaneous equation to be solved is ___________?
Ans : Total number of equation = (40-1)*1 + (160*2) = 359
Q.4 Single line diagram of which of the following power system is possible?
A. Balanced power system
B. Power system with LG fault
C. Power system with LL fault
D. Power system with LLG fault
Ans : Balanced power system
Q.5 Single line diagram does not represents
A. Neutral wire of transmission lines
B. Star connection of transformer winding
C. Ratings of machines
D. Delta connection of transformer winding
Ans : Neutral wire of transmission lines
Q.6 In impedance diagram different power system elements are represented by symbols.
Ans : False
Q.7 In combined operation of several power plants the reserve capacity requirement is reduced.
Ans : True
Q.8 A 50 bus power system Ybus has 80% sparsity. The total number of transmission lines will be ___________
Ans : 225
Q.9 The given graph is the depiction of ________ on a large power system network.
A. Ratings of machines
B. Any of the mentioned
C. Three phase motor getting short
D. L-G fault
Ans : L-G fault
Q.10 A power system has a maximum load of 15 MW. Annual load factor is 50%. The reserve capacity of plant is _____ if the plant capacity factor is 40%.
A. 3.75 MW
B. 7.75 MW
C. 46.75 MW
D. 8.75 MW
Ans : 3.75 MW
Q.11 A protection system engineer is planning to provide the complete protection, he can achieve this by ___________.
A. a two phase fault relays and three earth fault relays
B. a two phase fault relays and two earth fault relays
C. two phase fault relays and three earth fault relays
D. three phase fault relays and two earth fault relays
Ans : three phase fault relays and two earth fault relays
Q.12 The area under the load curve represents ____________.
A. maximum demand
B. load factor
C. the average load on power system
D. number of units generated
Ans : number of units generated
Q.13 If all the sequence voltages at the fault point in a power system are equal, then fault is __________.
A. LLG fault
B. Line to Line fault
C. Line to Line fault
D. LG fault
Ans : LLG fault
Q.14 If the power system network is at Vs∠δ and receiving end voltage is Vr∠0 consisting of the impedance of TL as (R+j5)Ω. For maximum power transfer to the load, the most appropriate value of resistance R should be __________.
Ans : 1.732
Q.15 Voltage regulation in the power system is __________.
A. rise in voltage at sending end
B. dip in voltage at sending end
C. rise in voltage at receiving end
D. dip in voltage at receiving end
Ans : rise in voltage at receiving end