Q.1
Single line diagram of which of the following power system is possible?
  • a) Power system with LG fault
  • b) Balanced power system
  • c) Power system with LL fault
  • d) Power system with LLG fault
Q.2
A power system will have greater flexibility of operation if they have __________
  • a) Only Base load plants operating in combination
  • b) Various types of power plants operating in combination
  • c) Only Peak load plants operating in combination
  • d) Only thermal power plants operating in combination
Q.3
Single line diagram does not represents:
  • a) Ratings of machines
  • b) Neutral wire of transmission lines
  • c) Delta connection of transformer winding
  • d) Star connection of transformer winding
Q.4
In impedance diagram different power system elements are represented by symbols.
  • a) False
  • b) True
Q.5
In combined operation of several power plants the reserve capacity requirement is reduced.
  • a) False
  • b) True
Q.6
For a given power system, its zero and maximum regulation will occur at the impedance angle of
  • a) 45
  • b) 60
  • c) 35
  • d) 50
Q.7
Abus power system hasPQ bus. For achieving a load flow solution by N-R in polar coordinates, the minimum number of simultaneous equation to be solved is ___________
  • a) 359
  • b) 334
  • c) 357
  • d) 345
Q.8
Abus power system Ybus hassparsity. The total number of transmission lines will be ___________
  • a) 225
  • b) 563
  • c) 345
  • d) 456
Q.9
The given graph is the depiction of ________ on a large power system network.
  • a) Three phase motor getting short
  • b) L-G fault
  • c) Ratings of machines
  • d) Any of the mentioned
Q.10
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
Q.11
A power system has a maximum load ofMW. 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
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
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) Three phase to ground fault
  • d) LG 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 __________
  • a) 1.732
  • b) 3.45
  • c) 5.2
  • d) 0.33
Q.15
Voltage regulation in the power system is __________
  • a) dip in voltage at sending end
  • b) rise in voltage at sending end
  • c) rise in voltage at receiving end
  • d) dip in voltage at receiving end
Q.16
Which of the following is not neglected during formation of reactance diagram from impedance diagram?
  • a) Shunt component of Transformers
  • b) Static loads
  • c) Resistance of various power system components
  • d) Reactance of alternators
Q.17
Which of the following is not a requirement for site selection of hydroelectric power plant?
  • a) Large catchment area
  • b) Rocky land
  • c) Sedimentation
  • d) Availability of water
Q.18
Which of the following is not an advantage of hydroelectric power plant?
  • a) no fuel requirement
  • b) continuous power source
  • c) low running cost
  • d) no standby losses
Q.19
Which of the following element of hydroelectric power plant prevents the penstock from water hammer phenomenon?
  • a) Surge Tank
  • b) Draft tubes
  • c) Spillway
  • d) Valves and Gates
Q.20
Which of the following part of thermal power plant causes maximum energy losses?
  • a) Alternator
  • b) Ash and unburnt carbon
  • c) Boiler
  • d) Condenser
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