Question for SECL Assistant Foreman 2026 - Quiz / Questions / MCQ

Objective Questions

Latest SECL Assistant Foreman Exam Question (Objective Questions), MCQ in English

Subjects : General Awareness/Aptitude & Knowledge regarding CIL/SECL, Subject Knowledge (Electrical)

Question Bank SECL Assistant Foreman Exam (Electrical) - English

General Awareness/Aptitude & Knowledge regarding CIL/SECL

Question 1Single 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 2Single 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 3Single 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 4Single 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 5Single 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 6Single 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 7Single Answer

Which of the following numbers is irrational ?

A
√49
B
0.125
C
√2
D
22/7

Question 8Single Answer

Passage :

information given below and answer the question that follow.
The result of an exam is given below. Out of 1000 students who appeared
(i) 658 failed in Physics
(ii) 166 failed in Physics and Chemistry
(iii) 372 failed in Chemistry, 434 failed in Physics and Maths
(iv) 590 failed in Maths, 126 failed in Maths & Chemistry
Find the number of people who failed in (assuming that none is passed in all subjects.

We have the following equations:
a+ b + c + d + e + f + g = 1000
a + b + d + e = 658, b + d = 166
b + d + c + f = 372
d + e = 434 as in the figure.
d + e + f + g = 590, d + f = 126. Find the values

Chemistry but not in Physics.

A
318
B
198
C
213
D
206

Question 9Single Answer

Passage :

Direction: information given below and answer the question that follow.
The result of an exam is given below. Out of 1000 students who appeared
(i) 658 failed in Physics
(ii) 166 failed in Physics and Chemistry
(iii) 372 failed in Chemistry, 434 failed in Physics and Maths
(iv) 590 failed in Maths, 126 failed in Maths & Chemistry
Find the number of people who failed in (assuming that none is passed in all subjects.

We have the following equations:
a+ b + c + d + e + f + g = 1000
a + b + d + e = 658, b + d = 166
b + d + c + f = 372
d + e = 434 as in the figure.
d + e + f + g = 590, d + f = 126. Find the values

Physics or Maths but not in Chemistry.

A
558
B
718
C
628
D
None of these

Question 10Single Answer

Passage :

For the next four question that follow:
In a city, three daily newspapers A, B, C are published, 42% read A; 51% read B; 68% read C; 30% read A and B; 28% read B and C; 36% read A and C; 8% do not read any of the three newspapers.

Let x% people read all the three newspapers.
Since 8% people do not read any newspapers.
(x – 24) + (x – 7) + (x + 4) + (30 – x) + (36 – x) + (28 – x) + x = 92
→ x + 98 – 31 = 92
→ x = 92 – 67 = 25

What is the percentage of persons who read all the three papers ?

A
20%
B
25%
C
30%
D
40%

Question 11Single Answer

Sattriya dance form is famous in which of these states ?

A
Assam
B
Himachal Pradesh
C
Punjab
D
Tamil Nadu

Question 12Single Answer

Which is the national game of Bhutan ?

A
badminton
B
basketball
C
football
D
archery

Question 13Single Answer

When was the Constituent Assembly of India formed?

A
1946
B
1947
C
1948
D
1950

Question 14Single Answer

Which is the longest river in India?

A
Yamuna
B
Ganges
C
Brahmaputra
D
Godavari

Question 15Single Answer

Ventilation in mines is necessary to?

A
Roof support only
B
Coal transport only
C
Dust suppression only
D
Dilute firedamp and remove noxious gases

Question 16Single Answer

Main purpose of booster fans is?

A
Roof support only
B
Coal transport only
C
Dust suppression only
D
Maintain airflow in obstructed or long airways

Question 17Single Answer

Air regulators help to?

A
Balance pressure and airflow in mines
B
Coal transport only
C
Dust suppression only
D
Roof support only

Question 18Single Answer

Air doors are used to?

A
Dust suppression only
B
Coal transport only
C
Direct airflow to working faces
D
Roof support only

Question 19Single Answer

Anemometer is used to measure?

A
Coal transport only
B
Air velocity
C
Dust suppression only
D
Roof support only

Question 20Single Answer

Which country's Supreme Leader, Ali Khamenei, was assassinated in a joint US-Israel strike in late February 2026?

A
Syria
B
Iraq
C
Lebanon
D
Iran

Subject Knowledge (Electrical)

Question 21Single 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 22Single 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 23Single 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 24Single 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 25Single 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 26Single 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 27Single 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 28Single 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 29Single 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 30Single 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 31Single 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 32Single 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 33Single 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 34Single 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 35Single 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 36Single 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 37Single 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 38Single 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 39Single 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 40Single 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 41Single 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 42Single 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 43Single 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 44Single 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 45Single 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 46Single Answer

A Zener regulator has an input voltage varying between 20 V and 30 V. The desired regulated voltage is 12 V, while the load varies between 140

and 10k The maximum resistance in series with the unregulated source and Zener diode would be

A
3.3
B
6.6
C
36.6
D
93.3

Question 47Single Answer

A short in any type of circuit (series, parallel or combination) causes the total circuit
1. resistance to decrease
2. power to decreases
3. current to increase
Which of the above are correct?

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

Question 48Single Answer

An air-cored solenoid of 250 turns has a cross-sectional area A = 80 cm² and length l = 100 cm. The value of its inductance is

A
0.425 mH
B
0.628 mH
C
0.751 mH
D
0.904 mH

Question 49Single Answer

The current in a coil changes uniformly from 10 A to 1 A in half a second. A voltmeter connected across the coil gives a reading of 36 V. The self-inductance of the coil is

A
0.5 H
B
1 H
C
2 H
D
4 H

Question 50Single Answer

In a mutually coupled circuit, the primary current is reduced from 4A to zero in 10 s. A voltage of 40000 V is observed across the secondary. The mutual inductance between the coils is

A
100 H
B
10 H
C
0.1 H
D
0.01 H

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Subject Knowledge (Electrical)

Question 51Single 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 52Single 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 53Single 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 54Single 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 55Single 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 56Single 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 57Single 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 58Single 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 59Single 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 60Single 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 61Single Answer

What is the primary purpose of Kirchhoff's Current Law (KCL)?

A
To ensure conservation of charge at a node
B
To calculate voltage drops
C
To determine power dissipation
D
To analyze resonance

Question 62Single Answer

In a circuit with three resistors in series, each of 5 Ω, what is the equivalent resistance?

A
5 Ω
B
15 Ω
C
67 Ω
D
10 Ω

Question 63Single Answer

What is the voltage across a 10 Ω resistor carrying a current of 2 A?

A
5 V
B
10 V
C
20 V
D
40 V

Question 64Single Answer

Which analysis technique uses loop currents as variables to solve a circuit?

A
Nodal analysis
B
Mesh analysis
C
Superposition theorem
D
Thevenin’s theorem

Question 65Single Answer

The Superposition theorem is applicable to:

A
Non-linear circuits
B
Linear bilateral circuits
C
Unilateral circuits
D
Time-varying circuits

Question 66Single Answer

Thevenin’s theorem converts a complex circuit into:

A
A single current source and parallel resistance
B
A single resistor
C
A single voltage source and series resistance
D
A single capacitor

Question 67Single Answer

For maximum power transfer, the load resistance should be:

A
Half of the source resistance
B
Equal to the source resistance
C
Twice the source resistance
D
Zero

Question 68Single Answer

Norton’s theorem is the dual of:

A
Thevenin’s theorem
B
Superposition theorem
C
Millman’s theorem
D
Reciprocity theorem

Question 69Single Answer

Millman’s theorem is used to find:

A
Equivalent resistance
B
Current through a resistor
C
Voltage across parallel branches
D
Power dissipation

Question 70Single Answer

Tellegen’s theorem is based on:

A
Conservation of energy
B
Conservation of charge
C
Maximum power transfer
D
Resonance

Question 71Single Answer

What is the basis of energy balance in electromechanical systems?

A
Input Energy = Output Energy
B
Input Energy = Mechanical Work + Stored Energy + Losses
C
Input Energy = Stored Energy Only
D
Input Energy = Losses Only

Question 72Single Answer

What is the primary coupling field in rotating machines?

A
Electric field
B
Magnetic field
C
Gravitational field
D
Thermal field

Question 73Single Answer

What is a condition for electromechanical energy conversion?

A
Static magnetic field only
B
Mechanical motion and electrical current
C
High temperature
D
Low voltage

Question 74Single Answer

How is energy stored in a magnetic field calculated?

A
( W_m = Li² )
B
( W_m = frac{1}{2}Li² )
C
( W_m = Psi i )
D
( W_m = frac{1}{2}Psi² )

Question 75Single Answer

What is co-energy in a magnetic system?

A
( W_m' = int Psi di )
B
( W_m' = frac{1}{2}Li^² )
C
( W_m' = Psi i )
D
( W_m' = frac{1}{2}Psi² )

Question 76Single Answer

How is force derived from stored energy at constant current?

A
( F = -frac{partial W_m(x,i)}{partial x} )
B
( F = +frac{partial W_m(x,i)}{partial x} )
C
( F = -frac{partial W_m'(x,Psi)}{partial x} )
D
( F = +frac{partial W_m'(x,Psi)}{partial x} )

Question 77Single Answer

What produces reluctance torque?

A
Maximum flux linkage
B
Minimum reluctance path alignment
C
High voltage
D
Low current

Question 78Single Answer

What characterizes a singly excited system?

A
Two electrical inputs
B
One electrical input
C
No electrical input
D
Multiple mechanical inputs

Question 79Single Answer

Which machine is an example of a doubly excited system?

A
Reluctance motor
B
Capacitor motor
C
Electromagnet
D
Synchronous machine

Question 80Single Answer

What causes transformer EMF?

A
Conductor motion
B
Time-varying flux
C
Constant flux
D
Mechanical work

Question 81Single Answer

What is the primary purpose of the Laplace transform in network analysis?

A
To solve differential equations in the time domain
B
To convert time-domain signals to frequency domain
C
To analyze discrete systems
D
To synthesize network components

Question 82Single Answer

What is the Laplace transform of a unit step function u(t)?

A
1/s
B
s
C
e(-s)
D
1/(s+1)

Question 83Single Answer

Which property of the Laplace transform is used to handle initial conditions in network analysis?

A
Linearity
B
Time-shifting
C
Differentiation in time domain
D
Convolution

Question 84Single Answer

What is the Laplace transform of the derivative of a function f(t)?

A
sF(s)
B
sF(s) - f(0)
C
F(s)/s
D
F(s) + f(0)

Question 85Single Answer

What is the primary application of the Laplace transform in circuit analysis?

A
Solving algebraic equations
B
Solving differential equations for transient response
C
Analyzing steady-state response
D
Synthesizing network components

Question 86Single Answer

What is the Laplace transform of an exponential function e(-at)?

A
1/(s+1)
B
Decrease the speed
C
Have no effect on speed
D
Increase the torque

Question 87Single Answer

Which transform is used to analyze the frequency response of a network?

A
Laplace transform
B
Fourier transform
C
Z-transform
D
Hilbert transform

Question 88Single Answer

What is the primary advantage of using the Fourier transform in network analysis?

A
Handles initial conditions
B
Analyzes steady-state sinusoidal signals
C
Solves discrete systems
D
Synthesizes networks

Question 89Single Answer

Which property of the Fourier transform is used to analyze convolution in networks?

A
Linearity
B
Time-shifting
C
Convolution theorem
D
Frequency-shifting

Question 90Single Answer

What is the Laplace transform of a unit impulse function (t)?

A
1
B
s
C
1/s
D
e(-s)

Question 91Single Answer

What is the primary function of a chopper in a DC drive system?

A
To regulate AC voltage
B
To convert DC to AC
C
To control DC voltage by varying duty cycle
D
To step up AC voltage

Question 92Single Answer

Which type of chopper is used for regenerative braking in DC drives?

A
Step-up chopper
B
Step-down chopper
C
Two-quadrant chopper
D
Single-quadrant chopper

Question 93Single Answer

In a DC drive, what does the armature control method primarily regulate?

A
Field current
B
Armature voltage
C
Motor torque
D
Back EMF

Question 94Single Answer

What is the role of a freewheeling diode in a DC chopper circuit?

A
To increase voltage
B
To provide a path for inductor current during off-time
C
To block reverse current
D
To regulate frequency

Question 95Single Answer

Which power electronic device is commonly used in DC drives for speed control?

A
Diode
B
Thyristor
C
IGBT
D
BJT

Question 96Single Answer

What is the main advantage of using a PWM-based chopper in DC drives?

A
High power loss
B
Reduced harmonics and improved efficiency
C
Fixed frequency operation
D
Low voltage regulation

Question 97Single Answer

In a DC motor drive, how is speed increased above the base speed?

A
By reducing field current
B
By increasing armature voltage
C
By increasing load torque
D
By reducing armature resistance

Question 98Single Answer

What is the purpose of a cycloconverter in AC drives?

A
To convert DC to AC
B
To convert AC of one frequency to another
C
To regulate DC voltage
D
To step up AC voltage

Question 99Single Answer

Which type of AC drive is most suitable for high-power applications?

A
Voltage source inverter (VSI) drive
B
Cycloconverter drive
C
Current source inverter (CSI) drive
D
Matrix converter drive

Question 100Single Answer

What is the function of a V/f control in AC drives?

A
To maintain constant torque
B
To maintain constant flux
C
To reduce harmonics
D
To increase power factor

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Latest SECL Assistant Foreman Exam Question (Objective Questions), MCQ in English

General Awareness/Aptitude & Knowledge regarding CIL/SECL

Subject Knowledge (Electrical)

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Subject Knowledge (Electrical)

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