Question for IOCL Diploma Engineer (Electrical) 2026 - Quiz / Questions / MCQ

Objective Questions

Latest IOCL Diploma Engineer Electrical Exam Question (Objective Questions), MCQ in English

Subjects : Domain Knowledge, Quantitative Aptitude, Logical Reasoning, English Language

Question Bank IOCL Diploma Engineer (Electrical) Exam - English

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Domain Knowledge

Question 1Single Answer

The basic function of an electric power generating station is to convert:

A
Mechanical energy into electrical energy
B
Electrical energy into mechanical energy
C
Chemical energy into thermal energy only
D
Electrical energy into heat energy

Question 2Single Answer

In a thermal power plant, the prime mover generally used to drive the alternator is a:

A
DC motor
B
Steam turbine
C
Hydraulic ram
D
Synchronous motor

Question 3Single Answer

The major source of energy in a conventional coal-fired power station is:

A
Nuclear fission
B
Solar radiation
C
Chemical energy of coal
D
Wind energy

Question 4Single Answer

A hydroelectric power station converts the potential energy of water primarily into:

A
Mechanical energy and then electrical energy
B
Chemical energy
C
Thermal energy
D
Nuclear energy

Question 5Single Answer

The generator most commonly used in large power stations is a:

A
Synchronous generator
B
DC shunt generator
C
Induction generator only
D
Universal generator

Question 6Single Answer

The frequency of generated AC voltage depends primarily on:

A
Generator resistance
B
Number of poles and rotor speed
C
Stator current only
D
Terminal voltage only

Question 7Single Answer

In India, the nominal frequency of the AC power system is:

A
25 Hz
B
40 Hz
C
50 Hz
D
60 Hz

Question 8Single Answer

Which power plant generally has the lowest operating fuel cost?

A
Diesel power plant
B
Gas turbine plant
C
Hydroelectric power plant
D
Coal-fired plant

Question 9Single Answer

A diesel power plant is particularly suitable for:

A
Peak-load and standby service
B
Very large base-load generation only
C
Nuclear generation
D
Pumped storage only

Question 10Single Answer

The main function of a boiler in a steam power plant is to:

A
Condense steam
B
Increase transmission voltage
C
Cool the generator
D
Convert water into high-pressure steam

Question 11Single Answer

The condenser in a steam power plant is used mainly to:

A
Heat boiler feedwater
B
Convert exhaust steam into water
C
Increase steam pressure
D
Generate electricity

Question 12Single Answer

An economizer in a thermal power station is used to:

A
Cool superheated steam
B
Preheat feedwater using flue gases
C
Increase generator speed
D
Remove ash

Question 13Single Answer

A superheater is used to:

A
Reduce steam temperature
B
Reduce boiler pressure
C
Condense steam
D
Raise steam temperature above saturation temperature

Question 14Single Answer

The device used to increase the temperature of air supplied for combustion using flue-gas heat is:

A
Air preheater
B
Condenser
C
Cooling tower
D
Feed pump

Question 15Single Answer

The main purpose of a cooling tower is to:

A
Cool generator windings directly
B
Increase steam pressure
C
Reject heat from circulating cooling water
D
Increase transformer efficiency

Question 16Single Answer

The load factor of a power station is the ratio of:

A
Average load to maximum demand
B
Maximum demand to average load
C
Connected load to maximum demand
D
Maximum demand to connected load

Question 17Single Answer

Demand factor is defined as the ratio of:

A
Maximum demand to connected load
B
Average load to connected load
C
Connected load to maximum demand
D
Maximum demand to average load

Question 18Single Answer

Diversity factor is generally:

A
Less than 1
B
Greater than 1
C
Equal to 0
D
Always equal to load factor

Question 19Single Answer

A base-load power station normally operates:

A
Only during emergencies
B
Only at night
C
Continuously at nearly constant high load
D
Only for a few minutes

Question 20Single Answer

Peak-load power plants are required when:

A
System demand is minimum
B
Transmission voltage falls permanently
C
System frequency is zero
D
System demand temporarily rises above base load

Question 21Single Answer

Which plant generally has the fastest starting capability?

A
Nuclear power plant
B
Gas turbine plant
C
Large coal plant
D
Conventional steam plant

Question 22Single Answer

Nuclear power plants commonly use energy released by:

A
Fission
B
Combustion
C
Fusion commercially
D
Electrolysis

Question 23Single Answer

In a nuclear reactor, the moderator is used to:

A
Accelerate neutrons
B
Increase turbine speed directly
C
Generate AC power
D
Slow down neutrons

Question 24Single Answer

Control rods in a nuclear reactor are used to:

A
Increase fuel temperature
B
Produce steam
C
Absorb neutrons
D
Cool the turbine

Question 25Single Answer

A pumped-storage plant is mainly used for:

A
Continuous base-load operation only
B
Producing coal
C
Energy storage and peak-load support
D
Eliminating transformers

Question 26Single Answer

The alternator in a power station usually generates voltage at:

A
Utilization voltage only
B
Extra-low voltage only
C
Moderate voltage that is stepped up for transmission
D
DC voltage

Question 27Single Answer

Transmission voltage is increased mainly to:

A
Increase line current
B
Increase conductor resistance
C
Reduce transmission losses
D
Decrease insulation requirement

Question 28Single Answer

The busbar in a generating station is used for:

A
Mechanical coupling
B
Collecting and distributing electrical power
C
Fuel transportation
D
Boiler pressure control

Question 29Single Answer

Synchronization of an alternator requires matching of:

A
Voltage, frequency, phase sequence and phase angle
B
Resistance only
C
Power factor only
D
Rotor diameter only

Question 30Single Answer

Which instrument is traditionally used to assist alternator synchronization?

A
Megger
B
Synchroscope
C
Earth tester
D
Watt-hour meter

Question 31Single Answer

An interconnected power system improves:

A
Frequency variation deliberately
B
Fuel consumption in every case
C
Conductor resistance
D
Reliability of supply

Question 32Single Answer

Spinning reserve refers to:

A
De-energized transformers
B
Spare transmission towers
C
Stored coal only
D
Generating capacity available from synchronized units

Question 33Single Answer

The installed capacity of a generating station means:

A
Sum of rated capacities of generating units
B
Its average annual output
C
Minimum load
D
Connected consumer load

Question 34Single Answer

Plant capacity factor compares actual energy generated with:

A
Energy possible at rated capacity continuously
B
Maximum demand only
C
Connected load only
D
Reactive power only

Question 35Single Answer

The most suitable plant for black-start capability is commonly a:

A
Nuclear reactor only
B
Hydroelectric or diesel unit
C
Large steam turbine without auxiliaries
D
Transformer bank

Question 36Single Answer

A combined-cycle power plant combines primarily:

A
Diesel and hydro cycles
B
Wind and nuclear cycles
C
Gas turbine and steam turbine cycles
D
Solar PV and diesel only

Question 37Single Answer

Cogeneration refers to simultaneous production of:

A
AC and DC only
B
Coal and steam
C
Electricity and useful thermal energy
D
Voltage and current

Question 38Single Answer

Ohm's law states that, at constant physical conditions:

A
P = V/R
B
V = I/R
C
R = VI
D
V = IR

Question 39Single Answer

The SI unit of electrical resistance is:

A
Siemens
B
Henry
C
Ohm
D
Farad

Question 40Single Answer

Kirchhoff's Current Law is based on conservation of:

A
Energy
B
Charge
C
Momentum
D
Power factor

Question 41Single Answer

Kirchhoff's Voltage Law is based on conservation of:

A
Electric charge only
B
Energy
C
Mass
D
Frequency

Question 42Single Answer

In a series circuit, the quantity common to all components is:

A
Voltage
B
Current
C
Power
D
Resistance

Question 43Single Answer

In a parallel circuit, all branches have the same:

A
Current
B
Voltage
C
Resistance
D
Power factor

Question 44Single Answer

The equivalent resistance of resistors connected in series is:

A
Product of resistances
B
Reciprocal of sum
C
Sum of resistances
D
Always zero

Question 45Single Answer

Two equal resistors connected in parallel have an equivalent resistance equal to:

A
Half either resistance
B
Twice either resistance
C
Four times either resistance
D
Same as either resistance

Question 46Single Answer

Conductance is the reciprocal of:

A
Inductance
B
Reactance only
C
Capacitance
D
Resistance

Question 47Single Answer

The unit of conductance is:

A
Siemens
B
Weber
C
Tesla
D
Coulomb

Question 48Single Answer

A capacitor opposes sudden changes in:

A
Current
B
Frequency
C
Resistance
D
Voltage

Question 49Single Answer

An inductor opposes sudden changes in:

A
Capacitance
B
Voltage only
C
Resistance
D
Current

Question 50Single Answer

In a pure resistive AC circuit, voltage and current are:

A
90° apart
B
In phase
C
180° apart
D
45° apart

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Quantitative Aptitude

Question 51Single 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 52Single Answer

Which of the following numbers is irrational ?

A
√49
B
0.125
C
√2
D
22/7

Question 53Single Answer

356 x 936 – 356 x 836 = ?

A
35600
B
34500
C
9630
D
93600

Question 54Single 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 55Single Answer

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

A
3⁶
B
3⁸
C
3¹⁰
D
9⁶

Question 56Single Answer

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

Question 57Single Answer

Convert 0.6 into fraction ?

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

Question 58Single 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 59Single 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 60Single Answer

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

A
93
B
103
C
60.5
D
121

Question 61Single Answer

Passage :

Direction : Each of the questions below consists of a question and two statements numbered (I) and (II) given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give answer :

How many employees of bank ‘X’ opted for VRS ?
(I) 18% of the 950 officer cadre employees and 6% of the 1100 of all other cadre employees opted for VRS.
(II) 28% of the employees in the age group of 51 to 56 and 17% of the employees in all other age groups opted for VRS.

A
Statement (I) ALONE is sufficient, but statement (II) alone is not sufficient
B
Statement (II) ALONE is sufficient, but statement (I) alone is not sufficient
C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
D
EACH statement ALONE is sufficient

Question 62Single Answer

Passage :

The area of a playground is 1600 square meters. What is its perimeter ?
(I) It is a perfect square playground
(II) It costs Rs.3200 to put a fence around the playground at the rate of Rs.20 per meter.

A
Statement (I) ALONE is sufficient, but statement (II) alone is not sufficient
B
Statement (II) ALONE is sufficient, but statement (I) alone is not sufficient
C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
D
EACH statement ALONE is sufficient

Question 63Single Answer

Passage :

What is the value of m – n ÷ 37 ?
(I) m is the largest possible six-digit number and n is the smallest possible six-digit number.
(II) The difference between m and n is known.

A
Statement (I) ALONE is sufficient, but statement (II) alone is not sufficient
B
Statement (II) ALONE is sufficient, but statement (I) alone is not sufficient
C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
D
EACH statement ALONE is sufficient

Question 64Single Answer

Passage :

What is the value of x ?
(I) If 10 is added to x, the result is 34.
(II) If x is multiplied by y, the result is 38.

A
Statement (I) ALONE is sufficient, but statement (II) alone is not sufficient
B
Statement (II) ALONE is sufficient, but statement (I) alone is not sufficient
C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
D
EACH statement ALONE is sufficient

Question 65Single Answer

Passage :

What was the total compound interest on a sum after three years ?
(I) The interest after one year was Rs. 100 and the sum after was Rs.1000.
(II) The difference between simple and compound interest on a sum of Rs.1000 at the end of two years was Rs.10.

A
Statement (I) ALONE is sufficient, but statement (II) alone is not sufficient
B
Statement (II) ALONE is sufficient, but statement (I) alone is not sufficient
C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
D
EACH statement ALONE is sufficient

Question 66Single Answer

Passage :

Each of the questions below consists of a question and two statements numbered (1) and (2) given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give answer.

Among Japanese Yen, Australian Dollar, Hong Kong Dollar and Singapore Dollar, which currency has the lowest value in terms of Indian rupees ?
(1) One rupee is equal to 2.56 Japanese Yen, 0.338 Australian Dollar, and 0.465 Hong Kong Dollar.
(2) Value of Australian Dollar is equal to Singapore Dollar.

A
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
B
Statement (2) ALONE is sufficient, but statement (I) alone is not sufficient
C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
D
Statements (1) and (2) TOGETHER are NOT sufficient

Question 67Single Answer

Passage :

What is the value of a two-digit number ?
(1) The sum of the two digits is 4.
(2) The difference between the two digits is 2.

A
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
B
Statement (2) ALONE is sufficient, but statement (I) alone is not sufficient
C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
D
Statements (1) and (2) TOGETHER are NOT sufficient

Question 68Single Answer

Passage :

What was the population of State ‘A’ in 1999 ?
(1) Population of the State increases every year by 20% and its population in 1997 was 1,20,000.
(2) Population of State A in 1997 was twice that of State B in the same year.

A
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
B
Statement (2) ALONE is sufficient, but statement (I) alone is not sufficient
C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
D
Statements (1) and (2) TOGETHER are NOT sufficient

Question 69Single Answer

Passage :

What is the speed of the boat in still water ?
(1) It takes 2 hours to cover the distance between A and B downstream.
(2) It takes 4 hours to cover the distance between A and B upstream.

A
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
B
Statement (2) ALONE is sufficient, but statement (I) alone is not sufficient
C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
D
Statements (1) and (2) TOGETHER are NOT sufficient

Question 70Single Answer

Passage :

How many vinyl squares with sides 5 inches long will be needed to cover the rectangular floor of a room ?
(1) The floor is 5ft long.
(2) The floor is 3 ft wide.

A
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
B
Statement (2) ALONE is sufficient, but statement (I) alone is not sufficient
C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
D
Statements (1) and (2) TOGETHER are NOT sufficient

Logical Reasoning

Question 71Single 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 72Single 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 73Single 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 74Single 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 75Single 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 76Single Answer

How many meaningful words can be made from the letters ‘LMEA’ using each letter only once in each word?

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

Question 77Single Answer

If it is possible to make only one meaningful word with the first, the second, the seventh and the eighth letters of the word TEMPORAL, which of the following will be the first letter of that word? If more than one such word can be made, give ‘Y’ as the answer and if no such word can be made, give ‘X’ as the answer.

Question 78Single Answer

If the letters of the word HANDOVER are arranged alphabetically from left to right how many letters will remain at the same position?

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

Question 79Single Answer

How many such pairs of letters are there in the word EXCURSION, each of which has as many letters between them in the word as they have in the English alphabet?

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

Question 80Single Answer

If it is possible to make only one meaningful word with the first, the second, the third, the sixth and the eighth letters of the word DEVIATION first letter of that word is your answer? If more than one such word can be made formed your answer is ‘A’ and if no such word can be formed your answer is ‘B’.

Question 81Single 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 82Single 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 83Single 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 84Single 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 85Single 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

English Language

Question 86Single Answer

I go to Madurai by —– Vaigai Express

A
a
B
an
C
some
D
the

Question 87Single 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 88Single 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 89Single 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 90Single 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 91Single 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 92Single Answer

Who taught you to drive a truck ?

A
To drive a truck by whom were you taught?
B
Driving a truck by who were you taught?
C
Driving a truck by who were you being taught?
D
By whom were you taught to drive a truck?

Question 93Single Answer

We shall invite Suresh.

A
Suresh would be invited by us
B
Suresh would have been invited by us
C
Suresh will be invited by us
D
Suresh will have been invited by us

Question 94Single Answer

Dark clouds have overcast the evening sky.

A
By the dark clouds the evening sky was overcast.
B
The evening sky has been overcast by the dark clouds.
C
Dark clouds overcastted the evening sky.
D
The sky of the evening was overcasted by dark clouds.

Question 95Single Answer

The partners will celebrate their triumph tomorrow.

A
The triumph would be celebrated by the partners a day before
B
The triumph would be celebrated by the partners a day after
C
The triumph would have been celebrated by the partners a day after
D
The triumph will have been celebrated by the partners tomorrow

Question 96Single 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 97Single 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 98Single 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 99Single 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 100Single 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

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Latest IOCL Diploma Engineer Electrical Exam Question (Objective Questions), MCQ in English

Domain Knowledge

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Quantitative Aptitude

Logical Reasoning

English Language

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