Question for BEL Engineering Assistant Trainee 2026 - Quiz / Questions / MCQ

Objective Questions

Latest BEL EAT Exam Question (Objective Questions), MCQ in English

Subjects : General Aptitude, Technical Subject (Electrical)

Question Bank BEL Engineering Assistant Trainee (Electrical) Exam - English

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General Aptitude

Question 1Single Answer

Yojna a weekly journal

A
Ministry of Finance
B
Ministry of Information and Broadcastin
C
Ministry of Rural Development
D
Planning Commission

Question 2Single Answer

Kurukshetra a journal on rural development is published by

A
Ministry of Finance
B
Ministry of Information and Broadcastin
C
Ministry of Rural Development
D
Planning Commission

Question 3Single Answer

Devaluation of a currency means

A
Fixing the value of the currency in conjuction with the movement in the value of a basket of predetermined currencies
B
Reduction in the value of a currency vis-à-vis major internationally traded currencies
C
Fixing the value of currency in multilateral consultaion with the IMF the World Bank and major trading partners
D
Permitting the currency to seek its worth in the international market

Question 4Single Answer

In India rural incomes are generally lower than the urban incomes, which of the following reasons account for this
1. a large number of farmers are illiterate and know little about scientific agriculture
2. prices of primary products are lower than those of manufactured products
3. Investments in agriculture has been low when compared to investment in industry

A
1 and 3
B
2 and 3
C
1 and 2
D
1,2 and 3

Question 5Single Answer

Which of the following programmes aims at the promotion of savings among rural women

A
Rashtriya Mahila Kosh
B
Indira Mahila Yojna
C
Jawahar Rozgar Yojna
D
Mahila Samridhi Yojna

Question 6Single Answer

What is Net National Product

A
the money value of final goods and services produced annually in the economy
B
the money value of annual service generation in the economy
C
the money value of tangible goods produced annually in the economy
D
The money value of tangible goods available in the economy

Question 7Single Answer

National income is the

A
net national product at market price
B
net national product at factor cost
C
net domestic product at market price
D
net domestic product at factor cost

Question 8Single Answer

Chelliah Committee of 1992 deals with the overhauling of our

A
financial system
B
tax system
C
patents and copyrights
D
Public sector undertakings

Question 9Single Answer

During which Five Year Plan was the annual growth rate of National Income the lowest

A
2^nd plan
B
3^rd plan
C
5^th plan
D
6^th plan

Question 10Single Answer

Which of the following taxes is a progressive tax

A
sales tax
B
custom tax
C
excise tax
D
income tax

Question 11Single Answer

I go to Madurai by —– Vaigai Express

A
a
B
an
C
some
D
the

Question 12Single Answer

Have the car stolen!

A
Steal the car
B
You should have the stolen car
C
Get someone to steal the car
D
They have stolen the car

Question 13Single Answer

The payment was collected by the hardworking salesman.

A
The hardworking salesman collected the payment.
B
the salesman who worked heard was able to collect the payment.
C
to collect the payment the salesman had to work hard.
D
The hardworking salesman was able to collect the payment.

Question 14Single Answer

I had to stop all my work to complete this project.

A
All other work had to be stopped to complete this project by me
B
For completing this project all other work must be stopped
C
For completing this project I had to stop all my work
D
To complete this project all other work had been stopped by me

Question 15Single Answer

They have published the names of all the successful candidates.

A
The candidates who have succeeded their names they had published.
B
The names of all the successful candidates have been published by them
C
The candidates who have succeeded their names have been published by them.
D
The names of all the successful candidate were published by them.

Question 16Single Answer

The online shopping site lowered the prices.

A
Lowering of the prices was done by the online shopping site
B
The prices were lowered by the online shopping site
C
The prices had been lowered by the online shopping site
D
The prices have been lowered by the online shopping site

Question 17Single Answer

Passage :

Direction : Question below has two blanks, each blank indicting that some thing has been omitted. Choose the word for each blank which best fits the meaning of the sentence as a whole.

The Finance Department has ……………a centralized online databank system for all statutory government bodies to …………an eye on their assets and liabilities.

A
presented , stay
B
introduced , keep
C
announce , make
D
created , let
E
proclaimed , hold

Question 18Single Answer

Passage :

Direction : The five items in this section consists of a word or group of words followed by four words as (a), (b), (c) and (d). Select the word which is nearly opposite to the meaning of the original word or group of words and mark your response as (a), (b), (c) and (d), as the case may be, in your Answer Sheet.

Assets

A
liabilities
B
responsibilities
C
estates
D
profits

Question 19Single Answer

Passage :

Direction : In the question, out of the four alternatives, choose the word which is opposite in meaning to the given word and click the button corresponding to it

Affidavit

A
Affirmation
B
Slander
C
Oath
D
Testimony

Question 20Single Answer

Passage :

Direction: In the following question, out of the four alternatives, choose the word which is opposite in meaning to the given word and click the button corresponding to it

Hollow

A
Alveolate
B
Cleft
C
Cavernous
D
Solid

Question 21Single Answer

Passage :

Directions: In the following question, out of the four alternatives, choose the word which is opposite in meaning to the given word and click the button corresponding to it

Cosset

A
Ignoreb
B
Close
C
Caress
D
Fondle

Question 22Single Answer

Passage :

Directions: In the following question, out of the four alternatives, choose the word which is opposite in meaning to the given word and click the button corresponding to it

Ogle

A
Leer
B
Gaze
C
Ignore
D
Gawk

Question 23Single Answer

Passage :

Directions:In the following question, out of the four alternatives, choose the word which is opposite in meaning to the given word and click the button corresponding to it

Intrinsic

A
Elemental
B
Innate
C
Connate
D
Acquired

Question 24Single Answer

How many such pairs of letters are there in the word ‘CLEANLINESS’ each of the which has as many letters between them in the word as they have in the English alphabet, in the same sequence?

A
Two
B
Three
C
Five
D
Four
E
None of these

Question 25Single Answer

Team A has scored more goals than Team B
Team C has scored fewer goals than Team B
Team A has scored fewer goals than Team C .
If the first two statements are true, the third statement is

A
True
B
False
C
Uncertain
D
None

Question 26Single Answer

If it is possible to make only one meaningful word with the second, the third, the sixth and the eight letters of the word FRAGMENT using each only once, which of the following will be the third letter of that word ? If no such word can be formed, give ‘X’ as the answer and if more than one such word can be formed, give ‘Y’ as the answer.

Question 27Single Answer

How many such letters are there in the word ORIENTAL each of which is as far away from the beginning of the word as when they are arranged alphabetically?

A
None
B
One
C
Two
D
Three
E
More than three

Question 28Single Answer

How many such pairs of letters in the word CREDIT each of which has as many letters between them in the word as in the English alphabet?

A
None
B
One
C
Two
D
Three
E
More than three

Question 29Single Answer

Passage :

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z .

Which letter in this alphabet is the eighth letter to the right of the letter and which is tenth letter to the left of the last but one letter of the alphabet ?

Question 30Single Answer

Passage :

Direction : The following question is based on the five words given below:
AND FOR THE BIG SUM (The new words formed after performing the mentioned operations may or may not necessarily the meaningful English words.)

If the third alphabet of each of the words is changed to the next alphabet in the English alphabetical series, which of the following will form a meaningful English word?

A
SUM
B
BIG
C
Both BIG and THE
D
FOR
E
Both FOR and BIG

Question 31Single Answer

Passage :

Direction : The following question is based on the five words given below:
AND FOR THE BIG SUM (The new words formed after performing the mentioned operations may or may not necessarily the meaningful English words.)

If the given words are arranged in the order as they would appear in a dictionary from left to right, which of the following will be second from the right ?

A
AND
B
FOR
C
THE
D
BIG
E
SUM

Question 32Single Answer

Passage :

Direction: The following question is based on the five words given below:
AND FOR THE BIG SUM (The new words formed after performing the mentioned operations may or may not necessarily the meaningful English words.)

If second alphabet in each of the words is changed to next alphabet in the English alphabetical order, how many words having two vowels (same or different vowels) will be formed ?

A
None
B
One
C
Two
D
Three
E
Four

Question 33Single Answer

Passage :

How many letters are there in the English alphabetical series between the second letter of the word which is second from the right and the second letter of the word which is second from the left of the given words?

A
Two
B
Five
C
Six
D
Nine
E
Three

Question 34Single Answer

Passage :

Direction: The following question is based on the five words given below:
AND FOR THE BIG SUM (The new words formed after performing the mentioned operations may or may not necessarily the meaningful English words.)

If in each of the given words, each of the consonant is changed to previous letter and each vowel is changed to next letter in the English alphabetical series, in how many words thus formed will no vowels appear?

A
None
B
One
C
Two
D
Three
E
More than three

Question 35Single Answer

Passage :

Direction : Following question is based on five words given below:
BRU LEGINKCATOWN
(The new words formed after performing the mentioned operations may or may not necessarily be meaningful English words)

If the third alphabet in each of the words is changed to the next alphabet in the English alphabetical order, how many words having two vowels (same or different vowels) will be formed?

A
None
B
One
C
Two
D
Three
E
Four

Question 36Single Answer

The cash difference between the selling prices of an article at a profit of 4% and 6% is Rs. 3. The ratio of the two selling prices is:__________ ?

A
51:52
B
52:53
C
51:53
D
52:55

Question 37Single Answer

Which of the following numbers is irrational ?

A
√49
B
0.125
C
√2
D
22/7

Question 38Single Answer

356 x 936 – 356 x 836 = ?

A
35600
B
34500
C
9630
D
93600

Question 39Single Answer

Arrange in descending order: 5/8, 7/10, 3/4

A
3/4 > 7/10 > 5/8
B
7/10 > 3/4 > 5/8
C
3/4 > 5/8 > 7/10
D
5/8 > 7/10 > 3/4

Question 40Single Answer

What is (3^{^}{4} times 9^{^}{2}) ?

A
3⁶
B
3⁸
C
3¹⁰
D
9⁶

Question 41Single Answer

If 3⁴X^-2 = 729, then find the value of X.

Question 42Single Answer

Convert 0.6 into fraction ?

A
3/5
B
2/3
C
4/5

Question 43Single Answer

The no. plate of a bus had peculiarity. The bus number was a perfect square. It was also a perfect square when the plate numbers were reversed. The bus company had only five hundred buses numbered from 1 to 500. What was the number ?

A
169
B
36
C
196
D
Can not say

Question 44Single Answer

If a and b are positive integers, such that ab = 125, then (a-b)^a+b-4= ?

A
16
B
25
C
28
D
30

Question 45Single Answer

If x^*y = x² + y² – xy, then value of 9^*11 is

A
93
B
103
C
60.5
D
121

Question 46Single Answer

Which state is hosting the National SARAS Mela 2025?

A
Karnataka
B
Maharashtra
C
Kerala
D
Gujarat

Question 47Single Answer

Which ministry released the ‘UDISE Plus’ Report in 2025?

A
Ministry of Finance
B
Ministry of Education
C
Ministry of Culture
D
Ministry of Urban Development

Question 48Single Answer

Which city reported a surge in Guillain-Barré Syndrome (GBS) cases in August 2025?

A
Jerusalem
B
Gaza
C
Tehran
D
Damascus

Question 49Single Answer

Where was the maiden Exercise Aarogya Setu organized by the Indian Army?

A
Sikkim
B
Assam
C
Tripura
D
Odisha

Question 50Single Answer

Which ministry launched the Udyam Sakhi Portal?

A
Ministry of Science and Technology
B
Ministry of Finance
C
Ministry of Micro, Small and Medium Enterprises
D
Ministry of Commerce

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Technical Subject (Electrical)

Question 51Single Answer

When a very small amount of higher conducting metal is added to a conductor, its conductivity will

A
increase
B
decrease
C
remain the same
D
increase or decrease depending on the impurity

Question 52Single Answer

An electrically balanced atom has 30 protons in its nucleus and 2 electrons in its outermost shell. The materials made of such atom is

A
a conductor
B
an insulator
C
a semiconductor
D
a superconductor

Question 53Single Answer

The temperature coefficient of resistance of a doped semiconductor is

A
always positive
B
always negative
C
zero
D
positive or negative depending upon the level of doping

Question 54Single Answer

In the slice processing of an integrated circuit

A
components are formed in the areas where silicon dioxide remains
B
components are formed in the areas where silicon dioxide has been removed
C
the diffusing elements diffuse through silicon dioxide
D
only on diffusion process is used

Question 55Single Answer

Permanent magnet loses the magnetic behaviour when heated because of
1. atomic vibration
2. dipole vibration
3. realignment of dipoles
Which of the above are correct?

A
1 and 2 only
B
1 and 3 only
C
1, 2 and 3
D
2 and 3

Question 56Single Answer

A semiconductor differs from a conductor in that it has

A
Only one path for the free electrons in the valence band
B
Only one path for holes in the conduction band
C
Two paths followed by free electrons and holes, one an ordinary path in the conduction band and the other one an extraordinary path in the valence band, respectively
D
Two paths followed by free electrons and holes, one an extraordinary path in the conduction band and the other one an ordinary path in valence band, respectively

Question 57Single Answer

Which of the following circuits is used for converting a sine wave into a square wave?

A
Monostablemultivibrator
B
Bistablemultivibrator
C
Schmitt trigger circuit
D
Darlington complementary pair

Question 58Single Answer

Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law ?

A
Capacitors
B
Inductors
C
Transistors
D
Resistance

Question 59Single Answer

Consider the following statements: A power supply uses bridge rectifier with a capacitor input filter. If one of the diodes is defective, then
1. The dc load voltage will be lower than its expected value
2. Ripple frequency will be lower than its expected value
3. The surge current will increase considerably
Which of the above statements are correct?

A
1 and 2 only
B
1 and 3 only
C
2 and 3 only
D
1, 2 and 3

Question 60Single Answer

Three identical amplifiers each having a voltage gain of 50 are cascaded. The open loop voltage gain of the combined amplifier is

A
71 dB
B
82 dB
C
91 dB
D
102 dB

Question 61Single Answer

If a square matrix of order 100 has exactly 15 distinct eigenvalues, then the degree of the minimum polynomial is

A
At least 15
B
At most 15
C
Always 15
D
Exactly 100

Question 62Single Answer

For high speed reading and storing of information in a computer, the core shall be of

A
Ferrite
B
Piezoelectric
C
Pyroelectric
D
Ferromagnetic above 768°C

Question 63Single Answer

Soft magnetic materials should have

A
Large saturation magnetization and large permeability
B
Low saturation magnetization and large permeability
C
Large saturation magnetization and low permeability
D
Low saturation magnetization and low permeability

Question 64Single Answer

Orbital magnetic moment of an electron, in an atom, is of the order of

A
0.1 Bohr magneton
B
1.0 Bohr magneton
C
10 Bohr magneton
D
100 Bohr magneton

Question 65Single Answer

When the temperature of a ferromagnetic material exceeds the Curie temperature, it behaves similar to a

A
Diamagnetic material
B
Ferrimagnetic material
C
Paramagnetic material
D
Antiferromagnetic material

Question 66Single Answer

Assuming both the voltage sources are in phase, the value of R for which maximum power is transferred from circuit A to circuit B is

A
0.8 Ω
B
1.4 Ω
C
2 Ω
D
2.8 Ω

Question 67Single Answer

For the intrinsic gallium-arsenide, the conductivity at room temperature 25°C is 10^-6 (ohm-m)^-1, the electron and hole nobilities are 0.85 m²/V-s and 0.04 m²/V-s respectively. What is the intrinsic carrier concentration at the room temperature?

A
7.0 × 10¹² m^-3
B
7.0 × 10^-12 m^-3
C
7.0 × 10^-12 m³
D
7.0 × 10¹² m³

Question 68Single Answer

The resistivity of intrinsic germanium at 30°C is 0.46 –m. What is the intrinsic carrier density at 30°C if the electron mobility is 0.38 m²/V-s and the hole mobility is 0.18 m²/V-s?

A
9.2 × 10⁵/m³
B
2.77 × 10³/m³
C
2.43 × 10¹⁹/m³
D
8.9 × 10¹²/m³

Question 69Single Answer

Heat conduction in a semiconductor takes place

A
By the mobility of the carriers
B
Due to energy gap between conduction band and valency band
C
By the holes and thermal vibrations of atoms
D
By the electrons and thermal vibrations of atoms

Question 70Single Answer

Brewster angle is the angle when a wave is incident on the surface of a perfect dielectric at which there is no reflected wave and the incident wave is

A
Parallel polarized
B
Perpendicularly polarized
C
Normally polarized
D
None of the above

Question 71Single Answer

An electrical breakdown of a p-n junction occurs if

A
Forward voltage increases up to the rating
B
Reverse voltage increases beyond the rating
C
Forward voltage decreases below the rating
D
Reverse voltage decreases below the rating

Question 72Single Answer

The chief deterrent to the widespread application of superconducting materials is

A
Very difficult to form, machine or case
B
The difficult in attaining and maintaining extremely low temperature
C
The poor strength-to-weight ratio
D
The lower oxidation rate at elevated temperatures

Question 73Single Answer

Which one of the following properties is not observed in the carbon nanotubes ?

A
High stiffness and strengths
B
Low densities
C
Unusual electrical property
D
Non-ductile

Question 74Single Answer

The evidence for the importance of electron-phonon interaction in super-conductors comes from

A
Meissner effect
B
Josephson effect
C
Isotope effect
D
x quantization experiments

Question 75Single Answer

Which one of the following materials is used for cable insulation ?

A
Phenol formaldehyde
B
Polytetrafluoroethylene
C
Polyvinyl chloride
D
Acrylonitrile butadiene styrene

Question 76Single Answer

For high speed reading and storing of information in a computer, the material used is

A
Ferrite
B
Piezoelectric
C
Pyroelectric
D
Ferromagnetic above 768°C

Question 77Single Answer

The temperature above which an anti-ferromagnetic material becomes paramagnetic is called

A
Peak temperature
B
Neel temperatur
C
Critical temperature
D
Weiss temperature

Question 78Single Answer

Which effect is the converse of Peltier effect ?

A
Seeback effect
B
Thomson effect
C
Hall effect
D
Joule effect

Question 79Single Answer

Magnetic materials which may be readily magnetized in either direction are

A
Soft magnetic materials
B
Hard magnetic materials
C
High eddy current loss materials
D
High hysteresis loss materials

Question 80Single Answer

Consider the following statements regarding a ferromagnetic material:
1.Below the ferromagnetic Curie temperature, the ferromagnetic materials exhibit hysteresis effect.
2.The coercive force is the filed required to reduce the flux density to zero.
Which of the above statements is/are correct?

A
Both 1 and 2
B
Neither 1 nor 2
C
1 only
D
2 only

Question 81Single Answer

The impact ionization phenomenon in semiconductor may be viewed as the reverse process of

A
Radiative recombination
B
Auger recombination
C
Surface recombination
D
Shockley-Read-Hall recombination

Question 82Single Answer

Refractive index of a slice glass can be reduced by doping it with tiny amount of

A
GeO₂
B
B₂O₃
C
P₂O_5x
D
Al₂O₃

Question 83Single Answer

If a diameter of a copper wire is increased by two times keeping its terminal voltage same, then the drift velocity will

A
Become twice
B
Become half
C
ecome four times
D
Remain unchanged

Question 84Single Answer

In an induction type energy meter, the steady speed attained by the rotating disc is
1.Proportional to the deflecting torque.
2.Proportional to the resistance of the path of eddy currents.
3.Inversely proportional to the effective readings of disc from its axis.
4.Inversely proportional to the square of brake magnetic flux.
Which of the above are correct?

A
1, 2 and 3 only
B
1, 2 and 4 only
C
2, 3 and 4 only
D
1, 2, 3 and 4

Question 85Single Answer

If ‘KCLFTSB’ stands for ‘best of luck’ and ‘SHSWDG’ stands for ‘good wishes’, which of the following indicates ‘ace the exam’?

A
MCHTX
B
MXHTC
C
XMHCT
D
XMHTC

Question 86Single Answer

Consider the following statements associated with the basic electrostatic properties of ideal conductors:
1.The resultant field inside is zero.
2.The net charge density in the interior is zero.
3.Any net charges reside on the surface.
4.The surface is always equipotential.
5.The field just outside is zero.
Which of the above statements are correct?

A
1, 2, 3 and 4
B
3, 4 and 5 only
C
1, 2 and 3 only
D
2 and 3 only

Question 87Single Answer

A semiconductor device made out of a material having very high temperature coefficient of resistance is

A
Transistor
B
Varistor
C
Thyristor
D
Thermistor

Question 88Single Answer

The electrical conductivity of a semiconductor increases with increase in temperature because

A
The carrier concentration increases
B
The mobility of carrier increases
C
Both carrier concentration and mobility increases
D
The band gap decreases

Question 89Single Answer

Which of the following are associated with soft superconductors?
1.Silsbee’s rule
2.Meissner effect
3.Faraday rotation
4.Curie-Weiss law

A
2, 3 and 4
B
1 and 3 only
C
1 and 2 only
D
2 and 3 only

Question 90Single Answer

In a two-channel oscilloscope operating in x-y mode, two in-phase 50 Hz sinusoidal waveforms of equal amplitude are fed to the two channels. What will be the resultant pattern on the screen?

A
An ellipse
B
A parabola
C
Straight line inclined at 45 with respect to x-axis
D
A circle

Question 91Single Answer

Resistance switching is normally resorted in case of

A
Air blast CB
B
Bulk oil CB
C
Minimum oil CB
D
All types of CB

Question 92Single Answer

By transmitting power at high voltage

A
it will give poor voltage regulation
B
it will give better voltage regulation
C
it will not effect voltage regulation
D
None of these

Question 93Single Answer

Which statement about the daily load curve is valid ?

A
The area under the curve gives the average demand
B
The ratio of the area under the curves to the total area of rectangle in which it is contained gives the load factor for the day
C
The peak of the curve gives the installed capacity of the plant
D
The area of the curves divided by the number of hours gives load factor

Question 94Single Answer

High voltage Schring bridge is used to measure

A
large capacitance without additional element
B
small capacitance without additional element
C
medium value capacitance
D
None of these

Question 95Single Answer

Draw - in - system of laying underground cables has the drawback (s) of

A
higher cost
B
reduced current carrying capacity of the cables
C
requirements of much deeper and wider trenches
D
repairs, alterations or additions difficult
E
all of the above except

Question 96Single Answer

Surge impedance of a transmission line is

A
independent of its length
B
dependent on its length
C
independent on its temperature
D
none of the above

Question 97Single Answer

If two synchronous generators connected in parallel loose synchronism, it will lead to

A
stalling of generators
B
wild fluctuations in current
C
wild fluctuations in current and voltage
D
None of these

Question 98Single Answer

A differential relay responds to

A
algebraic difference of two or more similar electrical quantities
B
vector difference of two or more similar electrical quantities
C
algebraic difference between two currents
D
algebraic difference between two voltages

Question 99Single Answer

The conductor carries more current on the surface in comparison to its core. This phenomenon is called the

A
Skin effect
B
Corona
C
Ferranti effect
D
Lenz's effect

Question 100Single Answer

A booster is connected in

A
series with the feeder
B
parallel with the feeder
C
both (a) and (b) are correct
D
none of these

Question 101Single Answer

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

Question 102Single Answer

The power transmitted will be maximum when

A
line reactance is high
B
corona losses are minimum
C
sending end voltage is more
D
receiving end voltage is more

Question 103Single Answer

The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The load factor of the consumer is

A
0.75
B
0.375
C
1.33
D
None of these

Question 104Single Answer

In a transformer, the exciting current will be in phase quadrature with the impressed voltage provided

A
only the leakage impedance drop is ignored
B
only the core loss is ignored
C
both the leakage impedance drop and the core loss are ignored
D
only the no - load copper loss is ignored

Question 105Single Answer

Which of the following techniques is used for the measurements of a.c. high frequency voltages ?

A
Peak voltmeter
B
Series resistance mircro - ammeter
C
Resistance potential divider
D
All of these

Question 106Single Answer

Use of additional shunt capacitor can be made for increasing the capability of line as it

A
reduces surge impedance Z₀
B
increases phase shift β
C
increase in α
D
all of the above

Question 107Single Answer

The sag of a transmission line is least affected owing to

A
weight of the conductor
B
current through the conductor
C
atmospheric temperature
D
ice deposited on the conductor

Question 108Single Answer

In case of Impulse Thermal break down of solid insulating materials, the critical electric field is proportional to

A
critical absolute temperature
B
square of critical absolute temperature
C
square of T₀
D
none of these

Question 109Single Answer

The insulation of the modern EHV lines is designed based on

A
corona
B
switching voltages
C
lightning voltage
D
all of these

Question 110Single Answer

For constant voltage transmission, the voltage drop along the line is maintained constant by installing

A
capacitors
B
inductors
C
resistors
D
synchronous phase modifiers at the receiving end

Question 111Single Answer

AC network analyser is employed for solving the problems of

A
load flow
B
load flow and stability
C
load flow and short - circuit
D
load flow, stability and short - circuit

Question 112Single Answer

The change in excitation in an alternator connected to an infinite line provides a corresponding change in

A
terminal voltage
B
speed of rotor
C
power generated
D
power factor

Question 113Single Answer

Different types of insulators used for transmission lines are

A
pin type only
B
suspension type only
C
strain type only
D
pin type, suspension type and shackle type

Question 114Single Answer

The conductor connecting consumer's terminals to the distributor is called the

A
feeder
B
distributor
C
service main
D
none of the above

Question 115Single Answer

Which of the following method or techniques can be used for the measurement of high d.c. voltages ?

A
Generating voltmeter
B
Electrostatic voltmeter
C
Peak voltmeter
D
Half effect generators

Question 116Single Answer

The ripple voltage in dc output is small if

A
frequency of supply voltage is small
B
the filtering capacitor is small
C
load current is small
D
none of these

Question 117Single Answer

The voltage measurements using uniform spark gap are

A
affected by dust particles
B
affected by polarity of supply
C
affected by temperature
D
none of these

Question 118Single Answer

Neutral earthing is provided for

A
the safety of personnel from electric shock
B
the safety of equipment and personnel against lightning and voltage surges
C
reducing the voltage stress on lines and equipment with respect to earth under various operating and fault conditions
D
controlling the earth fault currents for protective relaying
E
both (c) and (d)

Question 119Single Answer

The function of Lightning arrester is

A
to limiting the short - circuit fault current
B
to provide path to high voltage surge to earth
C
to reduce arcing
D
none of these

Question 120Single Answer

In which of the following cases are delay fuses used ?

A
For the protection of light circuits
B
For the protection of power out - let circuits
C
For the protection of fluorescent lamps
D
For the protection of motors

Question 121Single Answer

In order to improve the voltage profile of the line, compensation is resorted by providing

A
capacitors at the receiving end
B
reactors at the receiving end
C
resistors at the receiving end
D
none of these

Question 122Single Answer

Skin effect in conductor is proportional to

A
(diameter of conductor) ^1/2
B
diameter of conductor
C
(diameter of conductor)²
D
(diameter of conductor)⁴

Question 123Single Answer

The function of steel wire in an ACSR conductor is to

A
compensate for skin effect
B
take care of surges
C
provide additional mechanical strength
D
reduce inductance

Question 124Single Answer

A fault is more severe from the view point of RRRV if it is a

A
Short length fault
B
Medium length line fault
C
Long length line fault
D
None of these

Question 125Single Answer

Protective resistance to be connected between the sphere gap and the test equipment is required while measuring

A
power frequency and higher frequency a.c. voltage
B
power frequency and impulse voltage
C
all kinds of voltages
D
none of these

Question 126Single Answer

Series capacitor is used in a transmission line to

A
compensate the voltage drop
B
reduce line loss
C
limit short circuit current
D
improve load power factor

Question 127Single Answer

The passive element that is used as interconnecting element for the stable operation of interconnected system is

A
reactor
B
resistor
C
capacitor
D
resistor and capacitor

Question 128Single Answer

Corona loss in a transmission line is dependent on

A
diameter of the conductor
B
material of the conductor
C
height of the conductor
D
none of these

Question 129Single Answer

In a minimum oil circuit breaker the oil is used

A
to act as circuit breaking medium only
B
for circuit breaking and providing insulation
C
for providing insulation only
D
for none of the above purposes

Question 130Single Answer

Skin effect is

A
proportional to frequency
B
proportional to square of frequency
C
inversely proportional to frequency
D
independent of frequency

Question 131Single Answer

Rated making capacity of breaker is equal to

A
X rated symmetrical breaking capacity
B
2.55 X rated symmetrical breaking capacity
C
1 X rated symmetrical breaking capacity
D
none of these

Question 132Single Answer

The main reason for using high voltage for long distance power transmission is

A
reduction in transmission losses
B
reduction in time of transmission
C
increase in system reliability
D
none of the above

Question 133Single Answer

Bus - coupler is very essential in

A
single bus - bar arrangement
B
ring bus - bar arrangement
C
double bus, double breaker arrangement
D
main and transfer bus

Question 134Single Answer

With the rise in temperature, the insulation resistivity

A
remains unchanged
B
decreases linearly
C
increases linearly
D
reduces exponentially

Question 135Single Answer

The effect of bonding the cable is

A
to increase the effective resistance and inductance
B
to increase the effective resistance but reduce inductance
C
to reduce the effective resistance and inductance
D
to reduce the effective resistance but increase the inductance

Question 136Single Answer

Increase in temperature in overhead transmission lines causes

A
increase in stress and length
B
decrease in stress and length
C
decrease in stress but increase in length
D
none of the above

Question 137Single Answer

The insulation resistance of the cable decreases with the

A
increase in length of cable
B
decrease in length of cable
C
electric stresses
D
none of these

Question 138Single Answer

Corona has the disadvantage(s) of

A
power loss
B
interference with neighbouring communication circuits
C
introducing the harmonics, predominately third harmonics, into the transmission lines
D
all of the above

Question 139Single Answer

In a load duration curve for an intergrated power system the uppermost crest represents the energy contributed by

A
base power stations
B
major thermal stations
C
peaking hydro or gas turbine stations
D
non - conventional power stations

Question 140Single Answer

At bridge crossing and near the railway track ternary lead cables are used because they

A
are of high tensile strength
B
are of low coefficient of thermal expansion
C
are of low specific gravity
D
can withstand shocks and vibrations

Question 141Single Answer

The heat produced at the contact point owing to flow of electric current is least affected by

A
temperature of the surrounding medium
B
contact resistance
C
magnitude of electric current flowing
D
duration of flow of current

Question 142Single Answer

A stationary alternator should not be connected to the live bus - bar because

A
it is likely to operate as a synchronous motor
B
it will get short - circuited
C
it will reduce bus - bar voltage
D
all of the above

Question 143Single Answer

In a transmission system the feeder supplies power to

A
transformer substations (step - up)
B
service mains
C
distributors
D
all of the above

Question 144Single Answer

For a given amount of power to be transmitted over a certain distance with fixed power loss, the volume of copper required is

A
directly proportional to voltage
B
inversely proportional to voltage
C
inversely proportional to the square of voltage and pf of the load
D
directly proportional to the square of the voltage and pf of the load

Question 145Single Answer

Power despatch through a line can be increased by

A
installing series capacitors
B
installing shunt capacitors
C
installing series reactor
D
installing shunt reactor

Question 146Single Answer

In the figure shown which curve represents the variation of cost of generation per kWh with the load factor, for a thermal power plant ?

A
Curve A
B
Curve B
C
Curve C
D
Curve D

Question 147Single Answer

Under 'no load conditions the current in a transmission line is because of

A
capacitance effect
B
corona effect
C
proximity effect
D
back flow from earth

Question 148Single Answer

The only advantage of corona is that it

A
produces a pleasing luminous glow
B
makes line current sinusoidal
C
works as a safety valve for surges
D
ozone gas is produced

Question 149Single Answer

Earth wires are made of

A
copper
B
aluminium
C
iron
D
galvanised stranded steel

Question 150Single Answer

The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The demand factor of the consumer is

A
0.75
B
0.375
C
1.33
D
none of the above

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