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Test: Power System Stability of Power Systems


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10 Questions MCQ Test Power Systems | Test: Power System Stability of Power Systems

Test: Power System Stability of Power Systems for Electrical Engineering (EE) 2022 is part of Power Systems preparation. The Test: Power System Stability of Power Systems questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Power System Stability of Power Systems MCQs are made for Electrical Engineering (EE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Power System Stability of Power Systems below.
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Test: Power System Stability of Power Systems - Question 1

A 500-MVA synchronous machine has H1 = 4.6 MJ/MVA, and a 1500 MVA machine has H2 = 3.0 MJ/MVA. The two machines operate in parallel in a power station. The equivalent H constant for the two, relative to a 100 MVA base will be

Detailed Solution for Test: Power System Stability of Power Systems - Question 1

We know that,

Test: Power System Stability of Power Systems - Question 2

The load carrying capability of a long ac line is

Test: Power System Stability of Power Systems - Question 3

Fast acting excitation systems

Detailed Solution for Test: Power System Stability of Power Systems - Question 3

Fast field excitation system is one of the method to improve transient stability of the system.

Test: Power System Stability of Power Systems - Question 4

A shunt reactor in general

Detailed Solution for Test: Power System Stability of Power Systems - Question 4

Shunt reactors are used to reduce the effect of Ferranti effect when a medium or a long line is lightly loaded or is on no-load. It doesn’t affect the steady state power transfer limit.

Test: Power System Stability of Power Systems - Question 5

The angle swings during transients

Test: Power System Stability of Power Systems - Question 6

If the inertia constant H = 9.0 MJ/MVA for a 50 MVA generator, the stored energy is

Detailed Solution for Test: Power System Stability of Power Systems - Question 6


or,
K.E. stored = GH = 50 x 9 = 450 MJ

Test: Power System Stability of Power Systems - Question 7

Bundled conductors in a transmission line will

Detailed Solution for Test: Power System Stability of Power Systems - Question 7

Bundled conductors increases self GMD due to which the series inductive reactance is reduced as a result of which power transferred from sending end to the receiving end is increased. Hence, it improves the steady state stability of the system.

Test: Power System Stability of Power Systems - Question 8

A 1500 MVA synchronous generator has an inertia constant of 5.0 MJ/MVA. The inertia constant of the machine relative to a 50 MVA base is

Detailed Solution for Test: Power System Stability of Power Systems - Question 8

Since inertia constant,

∴ 
or,

Test: Power System Stability of Power Systems - Question 9

If the initial acceleration power of a 100 MVA, 50 Hz synchronous generator having H= 5 MJ/MVA is Xpu, the initial acceleration in elec-deg/s2 and the inertia constant in M J-s/ele-deg respectively will be 

Detailed Solution for Test: Power System Stability of Power Systems - Question 9

From swing equation,

Also, inertia constant,

Test: Power System Stability of Power Systems - Question 10

The critical clearing angle of a power system is related to

Detailed Solution for Test: Power System Stability of Power Systems - Question 10

tcr and δcr are related to transient stability limit. The fault in a power system must be cleared before δ reaches δcr and before tcr.

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