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Test: Power Systems - 3 - Electrical Engineering (EE) MCQ

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25 Questions MCQ Test - Test: Power Systems - 3

Test: Power Systems - 3 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) 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) 2024 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

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Short-circuit currents are due to

A.
single-phase to earth fault.
B.
phase-to-phase fault.
C.
all the three phases-to-earth fault.
D.
all the three phases short-to earth fault.
E.
any of the above

Test: Power Systems - 3 - Question 2

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Which of the following results in a symmetrical fault ?

A.
Single-phase-to earth.
B.
Phase-to-phase.
C.
All the three phases-to earth.
D.
Two phases-to earth.

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Test: Power Systems - 3 - Question 3

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

A.
Alternator.
B.
Transformer.
C.
Overhead lines.
D.
Underground cable

Test: Power Systems - 3 - Question 4

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

A.
Alternators.
B.
Switchgear.
C.
Transformers.
D.
Underground cable.

Test: Power Systems - 3 - Question 5

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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 ?

A.
neither 1 nor 2
B.
2 alone
C.
1 alone
D.
1 and 2

Test: Power Systems - 3 - Question 6

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The symmetrical components are used in the fault analysis because

A.
the number of equations becomes smaller.
B.
the sequence networks do not have mutual couplings.
C.
the results are required in terms of symmetrical components.
D.
None of these

Test: Power Systems - 3 - Question 7

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

A.
zero.
B.
phasor sum of phase currents.
C.
same as rms value of phase currents.
D.
same as peak value of phase currents.

Test: Power Systems - 3 - Question 8

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A balanced 3-phase system consists of

A.
zero-sequence currents only.
B.
positive-sequence currents only.
C.
negative-and zero-sequence currents.
D.
zero, negative and positive sequence currents.

Test: Power Systems - 3 - Question 9

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The positive sequence current of a transmission line is :

A.
always zero.
B.
1/3 of negative sequence current.
C.
equal to negative current.
D.
3 times negative sequence current

Test: Power Systems - 3 - Question 10

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Zero-sequence fault current is absent when fault is

A.
single-line-to ground fault.
B.
line-to-line ground fault.
C.
double-line-to ground fault.
D.
line-to-line

Test: Power Systems - 3 - Question 11

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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

A.
synchronous generator.
B.
synchronous motor.
C.
static load.
D.
transmission line.

Test: Power Systems - 3 - Question 12

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Negative-sequence reactance of a transformer is

A.
equal to the positive-sequence reactance.
B.
larger than the positive-sequence reactance.
C.
smaller than the positive-sequence reactance.
D.
None of these

Test: Power Systems - 3 - Question 13

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

Test: Power Systems - 3 - Question 14

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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 I_a0 = j2.37 pu, I_a1 = –j3.05 pu, I_a2 = j0.68 pu,V_a0 = V_a1 = V_a2 = 0.237 pu

A.
L-L fault.
B.
L-G fault.
C.
L-L-G fault.
D.
L-L-L fault.

Test: Power Systems - 3 - Question 15

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Fuses have got advantages of

A.
cheapest type of protection.
B.
inverse time-current characteristic.
C.
no maintenance.
D.
current limiting effect under short-circuit conditions.
E.
all of the above.

Test: Power Systems - 3 - Question 16

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The primary function of a fuse is to

A.
open the circuit.
B.
protect the appliance.
C.
protect the line.
D.
prevent excessive currents from flow through the circuit.

Test: Power Systems - 3 - Question 17

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The material used in liquid fuses is

A.
SF6
B.
distilled water.
C.
carbon tetra chloride.
D.
transformer oil.

Test: Power Systems - 3 - Question 18

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

A.
high speed operation.
B.
high rupturing capacity.
C.
no ageing effect.
D.
all of the above.

Test: Power Systems - 3 - Question 19

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

A.
pre-arcing time.
B.
arcing time.
C.
total operating time.
D.
none of these

Test: Power Systems - 3 - Question 20

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

A.
short-circuit current.
B.
the combination is newer employed in practice
C.
under all abnormal currents.
D.
low overload currents.

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

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For a circuit breaker 'break time' is

A.
same as opening time
B.
opening time + arc duration
C.
opening time + arc duration + resistor current duration.
D.
none

Test: Power Systems - 3 - Question 22

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

A.
circuit breaker operates then the relay.
B.
relay operates, then successively the isolator and the circuit breaker.
C.
relay operates then the circuit breaker.
D.
isolator operates, then successively the relay and the circuit breaker.

Test: Power Systems - 3 - Question 23

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

A.
thermionic emission of electrons.
B.
field emission of electrons
C.
(a) and (b) both.
D.
none of the above

Test: Power Systems - 3 - Question 24

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Arcing voltage will be the least in case of

A.
carbon.
B.
copper.
C.
silver.
D.
tungsten

Test: Power Systems - 3 - Question 25

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The most common type of fault is

A.
single-phase-to ground.
B.
phase-to-phase.
C.
two-phase-to ground.
D.
three-phase to ground

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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