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Which of the following reactors uses its fuel as coolant?
a Explanation: On the basis of cooling system employed reactors are of two types. One is Direct and another is indirect reactor. Direct reactor used as fuel in liquid form and it acts as coolant. It is circulated through the heat exchanger in which heat is transferred to water to produce steam.
a
See lessExplanation: On the basis of cooling system employed reactors are of two types. One is
Direct and another is indirect reactor. Direct reactor used as fuel in liquid form and it acts
as coolant. It is circulated through the heat exchanger in which heat is transferred to
water to produce steam.
Which of the following power plants can be profitably employed for supplying base loads as well as peak loads?
b Explanation: Seam and Nuclear power plants are only used to supply base load. Diesel power plants are suitable for only peak load. Only hydroelectric power plant can supply both peak load as well as base load because of its flexibility in operation and low operating cost
b
See lessExplanation: Seam and Nuclear power plants are only used to supply base load. Diesel
power plants are suitable for only peak load. Only hydroelectric power plant can supply
both peak load as well as base load because of its flexibility in operation and low
operating cost
If all the sequence voltages at the fault point in a power system are equal, then fault is __________
a Explanation: It is LLG fault.
a
See lessExplanation: It is LLG fault.
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 Explanation: For maximum power transfer, X=√3 R 3=√3 R R=√3
a
See lessExplanation: For maximum power transfer, X=√3 R
3=√3 R
R=√3
Voltage regulation in the power system is __________
: c Explanation: VR is rise in voltage at receiving end for a transmission line.
: c
See lessExplanation: VR is rise in voltage at receiving end for a transmission line.
Which of the following is not neglected during formation of reactance diagram from impedance diagram?
a Explanation: Reactance diagram is drawn by the help of symmetrical network of various power system components by neglecting resistance of various components, static loads like induction motors and shunt component of Transformers
a
See lessExplanation: Reactance diagram is drawn by the help of symmetrical network of various
power system components by neglecting resistance of various components, static loads
like induction motors and shunt component of Transformers
If all the sequence voltages at the fault point in a power system are equal, then fault is __________
Answer: a Explanation: It is LLG fault.
Answer: a
See lessExplanation: It is LLG fault.
A protection system engineer is planning to provide the complete protection, he can achieve this by ___________
d Explanation: For the complete protection of the power system, one can use 3 phase fault relays and two earth fault relays so that to cover the entire zone of operation
d
See lessExplanation: For the complete protection of the power system, one can use 3 phase fault
relays and two earth fault relays so that to cover the entire zone of operation
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 Explanation: LF = (Average Demand)/(Maximum Demand)=0.5 Plant capacity factor =(Average Load)/(Plant Capacity)= 0.5/0.4 Plant capacity= (0.5/0.4)*15 = 18.75 MW Reserve Capacity = 18.75-15 = 3.75 MW
a
See lessExplanation: LF = (Average Demand)/(Maximum Demand)=0.5
Plant capacity factor =(Average Load)/(Plant Capacity)= 0.5/0.4
Plant capacity= (0.5/0.4)*15 = 18.75 MW
Reserve Capacity = 18.75-15 = 3.75 MW
The area under the load curve represents ____________
d Explanation: Load curve is obtained by plotting fluctuating load be keeping load on y axis and time in x axis. The area under the load curve represents the total number of units generated in a particular time.
d
See lessExplanation: Load curve is obtained by plotting fluctuating load be keeping load on y
axis and time in x axis. The area under the load curve represents the total number of
units generated in a particular time.