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Test: Power Systems- 2 - Electrical Engineering (EE) MCQ


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20 Questions MCQ Test GATE Electrical Engineering (EE) Mock Test Series 2025 - Test: Power Systems- 2

Test: Power Systems- 2 for Electrical Engineering (EE) 2024 is part of GATE Electrical Engineering (EE) Mock Test Series 2025 preparation. The Test: Power Systems- 2 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Power Systems- 2 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Power Systems- 2 below.
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Test: Power Systems- 2 - Question 1

A power system will have greater flexibility of operation if they have __________

Detailed Solution for Test: Power Systems- 2 - Question 1

If various types of power plants are operated in combination, the system will become more flexible i.e Steam and Nuclear power plants will supply base loads, Hydroelectric power plants will supply base or peak loads depending upon the availability of water, Gas turbine power plant will meet peak load demand and existing Diesel power plant will operate in emergency only.

Test: Power Systems- 2 - Question 2

For a given power system, its zero and maximum regulation will occur at the impedance angle of

Detailed Solution for Test: Power Systems- 2 - Question 2

At θ=45°, ZVR and maximum VR coincide.

Test: Power Systems- 2 - Question 3

A 50 bus power system Ybus has 80% sparsity. The total number of transmission lines will be ___________

Detailed Solution for Test: Power Systems- 2 - Question 3

Number of non zero elements = 50*50*20/100 = 500 non zero
Number of TL = (500-50)/2 = 225 transmission lines.

Test: Power Systems- 2 - Question 4

A protection system engineer is planning to provide the complete protection, he can achieve this by ___________

Detailed Solution for Test: Power Systems- 2 - Question 4

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.

Test: Power Systems- 2 - Question 5

The area under the load curve represents ____________

Detailed Solution for Test: Power Systems- 2 - Question 5

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.

Test: Power Systems- 2 - Question 6

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 __________

Detailed Solution for Test: Power Systems- 2 - Question 6

For maximum power transfer, X=√3 R
3=√3 R
R=√3.

Test: Power Systems- 2 - Question 7

Which of the following is not neglected during formation of reactance diagram from impedance diagram?

Detailed Solution for Test: Power Systems- 2 - Question 7

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.

Test: Power Systems- 2 - Question 8

Which of the following is not an advantage of hydroelectric power plant?

Detailed Solution for Test: Power Systems- 2 - Question 8

Output of such plants is never constant. This is because of their dependency over flow rate of water in river which is seasonal. No fuel requirement low running cost and no standby losses are advantages of hydroelectric power plants.

Test: Power Systems- 2 - Question 9

Which of the following part of thermal power plant causes maximum energy losses?

Detailed Solution for Test: Power Systems- 2 - Question 9

About 54% of energy losses occurs in condenser. Losses in boiler and alternator are about 1% and 16% because of such high losses overall efficiency of thermal power plant reduces to 29% for normal old thermal power plant and 50% for modern super critical pressure steam power plant which employs many heat saving devices.

Test: Power Systems- 2 - Question 10

Which of the following is most suitable fuel for thermal power plant?

Detailed Solution for Test: Power Systems- 2 - Question 10

Peat and lignite coals have low calorific value and high ash content. Anthracite coals are found in small quantities and are therefore costlier for power generation. Bituminous coals have enough calorific value, low moisture and ash content so most suitable for power generation.

Test: Power Systems- 2 - Question 11

Which of the following method is used in large modern thermal power plants to heat feed water?

Detailed Solution for Test: Power Systems- 2 - Question 11

Open and contact type haters are in small power plants. Such heaters recives steam from back pressure turbine. In large modern power plants heaters bleed steam from the main turbine and use it for heating of feed water.

Test: Power Systems- 2 - Question 12

What of the below mentioned statements are incorrect as compared to the HVDC system?

Detailed Solution for Test: Power Systems- 2 - Question 12

Out of all the corona losses are less in HVDC system.

Test: Power Systems- 2 - Question 13

Which component of gas turbine power plant is main cause of its low efficiency?

Detailed Solution for Test: Power Systems- 2 - Question 13

The overall efficiency of gas turbine is low, because a greater part of power developed by the turbine (about 65%) is used in driving the compressor.

Test: Power Systems- 2 - Question 14

Which of the following is an essential requirement for a peak load plant?

Detailed Solution for Test: Power Systems- 2 - Question 14

The power plants to be employed as peak load plant should only have the capability of quick start, synchronization and taking up of system load and quick response to load variations.

Test: Power Systems- 2 - Question 15

Single line diagram of which of the following power system is possible?

Detailed Solution for Test: Power Systems- 2 - Question 15

Only balanced power system can be represented by a single line diagram. Single line diagram is drawn on per phase basis. A power system with LLG, LG and LL faults becomes unbalanced and can not be represented in per phase basis.

Test: Power Systems- 2 - Question 16

Single line diagram does not represents:

Detailed Solution for Test: Power Systems- 2 - Question 16

Single line diagram is a representation of balanced power system on per phase basis with neutral eliminated. Neutral wire is not shown in single line diagram. Winding connections (star or neutral) is represented beside the symbol of transformer with its Impidance and rating.

Test: Power Systems- 2 - Question 17

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 ___________

Detailed Solution for Test: Power Systems- 2 - Question 17

Total buses = 200
PQ buses = 160
PV buses = 200-160 = 40
Slack bus = 1
Total number of equation = (40-1)*1 + (160*2) = 359.

Test: Power Systems- 2 - Question 18

The given graph is the depiction of ________ on a large power system network.

Detailed Solution for Test: Power Systems- 2 - Question 18

A LG fault will create a sudden dip in the voltage profile and it will be recovered.

Test: Power Systems- 2 - Question 19

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%.

Detailed Solution for Test: Power Systems- 2 - Question 19

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.

Test: Power Systems- 2 - Question 20

Voltage regulation in the power system is __________

Detailed Solution for Test: Power Systems- 2 - Question 20

VR is rise in voltage at receiving end for a transmission line.

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