Test: Power Systems - 3


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25 Questions MCQ Test Electrical Engineering SSC JE (Technical) | Test: Power Systems - 3

Test: Power Systems - 3 for Electrical Engineering (EE) 2022 is part of Electrical Engineering SSC JE (Technical) preparation. The Test: Power Systems - 3 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Power Systems - 3 MCQs are made for Electrical Engineering (EE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Power Systems - 3 below.
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Test: Power Systems - 3 - Question 1

Short-circuit currents are due to

Test: Power Systems - 3 - Question 2

Which of the following results in a symmetrical fault ?

Test: Power Systems - 3 - Question 3

Which portion of the transmission system is more prone to faults ?

Test: Power Systems - 3 - Question 4

Which portion of the power system is least prone to faults ?

Test: Power Systems - 3 - Question 5

The load currents in short-circuit calculation are neglected because
1. short-circuit currents are much larger than load currents.
2. short-circuit currents are greatly out of phase with load currents.
Which of these statement(s) is/are correct ?

Test: Power Systems - 3 - Question 6

The symmetrical components are used in the fault analysis because

Test: Power Systems - 3 - Question 7

In a star-connected system without neutral grounding, zero-sequence currents are

Test: Power Systems - 3 - Question 8

A balanced 3-phase system consists of

Test: Power Systems - 3 - Question 9

The positive sequence current of a transmission line is :

Test: Power Systems - 3 - Question 10

Zero-sequence fault current is absent when fault is

Test: Power Systems - 3 - Question 11

If the positive,-negative-and zero-sequence reactances of an element of a power system are 0.3, 0.3 and 0.8 pu respectively, then the element would be a

Test: Power Systems - 3 - Question 12

Negative-sequence reactance of a transformer is

Test: Power Systems - 3 - Question 13

The zero-sequence circuit of the three-phase transformer show in the figure is

Test: Power Systems - 3 - Question 14

A fault occurring at the terminals of an unloaded synchronous generator operating at its rate voltage has resulted in the following values of currents and voltages Ia0 = j2.37 pu, Ia1 = –j3.05 pu, Ia2 = j0.68 pu,Va0 = Va1 = Va2 = 0.237 pu

Test: Power Systems - 3 - Question 15

Fuses have got advantages of

Test: Power Systems - 3 - Question 16

The primary function of a fuse is to

Test: Power Systems - 3 - Question 17

The material used in liquid fuses is

Test: Power Systems - 3 - Question 18

In comparison to rewirable fuses HRC fuses have the advantage(s) of

Test: Power Systems - 3 - Question 19

In HRC fuse the time between cut-off and final current zero is called the

Test: Power Systems - 3 - Question 20

If a combination of HRC fuse and a circuit breaker is used, the circuit breaker operates for

Detailed Solution for Test: Power Systems - 3 - Question 20

The HRC fuse element carries the short circuit or faults current for the specific interval of time. If the fault is removed in that specific period, then the fuse element remains safe and it does not melt or breaks.

If circuit breaker and HRC fuse both use in a combination, circuit breaker operates for low overload currents.

Test: Power Systems - 3 - Question 21

For a circuit breaker 'break time' is

Test: Power Systems - 3 - Question 22

When a fault occurs in a high voltage transmission line, first the

Test: Power Systems - 3 - Question 23

The initiation of electric arc at the instant of contact separation is caused by
 

Test: Power Systems - 3 - Question 24

Arcing voltage will be the least in case of

Test: Power Systems - 3 - Question 25

The most common type of fault is

Detailed Solution for Test: Power Systems - 3 - Question 25

A single line to ground (LG) fault is one of the most common faults and experiences show that 70-80 percent of the faults that occur in power system are of this type. This forms a short circuit path between the line and ground. These are very less severe faults compared to other faults.

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