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Objective Questions

Latest BEL Trainee Engineer Mechanical Exam Question (Objective Questions), MCQ in English

Subjects : Technical Subject (Mechanical), General Aptitude

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Technical Subject (Mechanical)

Question 1Single Answer

Which of the following is the unit of kinematic viscosity _________________?

A
Pascal
B
Poise
C
Stoke
D
Faraday
E
None of the above

Question 2Single Answer

Consider the following processes:
1. Extension of a spring
2. Plastic deformation of a material
3. Magnetization of a material exhibiting hysteresis
Which of the above process are irreversible?

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

Question 3Single Answer

Which of the following statements are correct for a throttling process?
1. It is an adiabatic steady flow process
2. The enthalpy before and after throttling is same
3. In the processes, due to fall in pressure, the fluid velocity at outlet is always more than inlet velocity

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

Question 4Single Answer

A Reversed Carnot Engine removes 50 kW from a heat sink. The temperature of the heat sink is 250 K and the temperature of the heat reservoir is 300 K. The power required of the engine is

A
10 kW
B
20 kW
C
30 kW
D
50 kW

Question 5Single Answer

A heat engine receives heat at the rate of 2500 kJ/min and gives an output of 12.4 kW. Its thermal efficiency is, nearly

A
18%
B
23%
C
26%
D
30%

Question 6Single Answer

Consider the following motions :
1. Piston reciprocating inside an engine cylinder
2. Motion of a shaft between foot-step bearings
Which of the above can rightly be considered as successfully constrained motion?

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

Question 7Single Answer

A rotor weighing 2 kN is supported on bearings A and B which are 1 m apart. The centre of mass of the rotor is at a distance 0.4 m from bearing A. It is observed that there is an unbalanced couple of magnitude 300 N-m which leaves the shaft balanced statically.The dynamic reactions at the supports will be

A
800 N and 800 N
B
300 N and 800 N
C
800 N and – 300 N
D
300 N and – 300 N

Question 8Single Answer

A cam is a mechanical member used to impart a desired motion to a follower by direct contact. Which one of the under-listed follower motion types will produce the least jerk to the system?

A
Simple harmonic
B
Constant acceleration and deceleration
C
Constant velocity
D
Cycloidal

Question 9Single Answer

In a circular are cam with a roller follower, acceleration of the follower depends on
1. cam speed and location of centre of circular arc
2. roller diameter and radius of circular arc
Which of the above is/are correct?

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

Question 10Single Answer

A manufacturing company is selling a product for 15 per unit with variable cost of 10 per unit. The fixed cost of the asset is 50,000. How many units should be produced to breakeven?

A
2000
B
5000
C
8000
D
10000

Question 11Single Answer

A spherical waterdrop of 1 mm in diameter splits up in air into 64 smaller drops of equal size. The surface tension coefficient of water in air is 0.073 N/m. The work required in splitting up the drop is

A
0.96 × 10^–6 J
B
0.69 × 10^–6 J
C
0.32 × 10^–6 J
D
0.23 × 10^–6 J

Question 12Single Answer

Consider the following statements pertaining to stability of floating bodies:
1. A floating body will be stable when the centre of gravity is above the centre of buoyancy.
2. The position of metacentres corresponding to different axes of rotation are generally different for the same floating object.
3. For cargo ships, the metacentric height varies with loading.
Which of the above statements are correct?

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

Question 13Single Answer

Water is coming out from a tap and falls vertically downwards. At the tap opening, the stream diameter is 20 mm with uniform velocity of 2 m/s. Assuming steady inviscid flow, constant pressure atmosphere everywhere, and neglecting curvature and surface tension effects, the diameter of the stream 0.5 m below the tap opening is nearly

A
11.7 mm
B
14.6 mm
C
17.5 mm
D
20.4 mm

Question 14Single Answer

Consider the following statements:
1. At low Reynolds numbers of any flow, viscous forces dominate over inertial forces.
2. Transition from laminar to turbulent flow occurs over a range of Reynolds numbers depending on the surface presented to the flow.
Which of the above statements is/are correct?

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

Question 15Single Answer

In a steady laminar flow of a given discharge through a circular pipe of diameter D, the head loss is proportional to

A
D^–1
B
D^–2
C
D^–3
D
D^–4

Question 16Single Answer

A fin will be more effective when Bio number is

A
Greater than 1
B
Equal to 1
C
Between 1 and 3
4 4
D
Less than 1

Question 17Single Answer

A tank of length, breadth and height in the ratio of 2:1:2 is full of water. The ratio of hydrostatic force at the bottom to that at any larger vertical surface is

Question 18Single Answer

Which of the following fluids exhibit a certain shear stress at zero shear strain rate followed by a straight line relationship between shear stress and shear strain rate?

A
Newtonian fluid
B
Ideal Bingham plastic fluids
C
Pseudo-plastic fluids
D
Dilatent fluids

Question 19Single Answer

What is the specific gravity of a marble stone, which weighs 400N in air, and 200N in water? (g=10m/s²)

Question 20Single Answer

What is the intensity of pressure in the following SI units, when specific gravity of mercury is 13.6 and the intensity of pressure is 400KPa ?

A
0.3 bar or 4.077m of water or 0.29 mm of Hg
B
4 bar or 5.077m of water or 0.399 mm of Hg
C
0.3 bar or 5.077m of water or 0.599 mm of Hg
D
4 bar or 4.077m of water or 0.299 mm of Hg

Question 21Single Answer

Consider the following statements:
1.If a small upward displacement is given to a floating body, it results in the reduction of the buoyant force acting on the body
2.A slight horizontal displacement does not change either the magnitude or the location of the buoyant force
Which of the above statements is/are correct?

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

Question 22Single Answer

State whether following flow field is physically possible?

A
Possible for steady, incompressible flow
B
Possible for unsteady, incompressible flow
C
Possible for steady, compressible flow
D
Not Possible

Question 23Single Answer

In a differential manometer, a head of 0.5 m of fluid A in limb 1 is found to balance a head of 0.3 m of fluid B in limb 2. The atmospheric pressure is 760 mm of mercury. The ratio of specific gravities of A to B is

A
0.25
B
0.26
C
2
D
4

Question 24Single Answer

A Reversed Carnot Engine removes 50 kW from a heat sink. The temperature of the heat sink is 250 K and the temperature of the heat reservoir is 300 K. The power required of the engine is

A
10 kW
B
20 kW
C
30 kW
D
50 kW

Question 25Single Answer

On which of the following just in time manufacturing philosophy emphasizes ?

A
man power
B
profit
C
inventory
D
manufacturing

Question 26Single Answer

If a submerged body displaced from its equilibrium position, returns to its original position, it is called __________.

A
thermal equilibrium
B
neutral equilibrium
C
unstable equilibrium
D
stable equilibrium

Question 27Single Answer

In a flow measurement, a venturi meter is preferred over an orifice plate because _____.

A
energy of head loss is less
B
It is cheaper
C
pressure drop is more
D
space is limited

Question 28Single Answer

Pitot tube measures ______.

A
dynamic pressure of a moving stream
B
guage pressure
C
temperature of moving water
D
pressure difference between two fluids

Question 29Single Answer

Which of the following is not a property of an ideal fluid ?

A
flow is irrotational
B
it has no viscosity
C
it has viscosity
D
it is incompressible

Question 30Single Answer

Nozzle used in steam turbines convert ________.

A
enthalpy of steam into work
B
enthalpy of steam into kinetic energy
C
enthalpy of steam into pressure energy
D
pressure energy into work

Question 31Single Answer

Which of the following assumptions is the most relevant in air-standard cycle analysis ?

A
All the processes within the cycle are irreversible
B
Working fluid is a fixed mass
C
Specific heat of air changes during the cycle
D
Cycle is assumed to be an open cycle

Question 32Single Answer

The modern Francis turbine is a ___________flow turbine .

A
tangential
B
axial
C
radial
D
mixed

Question 33Single Answer

Variation of stress with strain rate for a Newtonian fluid is ______ .

A
hyperbolic
B
linear
C
elliptical
D
parabolic

Question 34Single Answer

Which of the following is NOT a part of refrigeration systems ?

A
Turbine
B
Evaporator
C
Compressor
D
Condenser

Question 35Single Answer

Which of the following is NOT an intensive property ?

A
Temperature
B
Total volume
C
Pressure
D
Density

Question 36Single Answer

Which of the following does NOT represent a unit of viscosity ?

A
Stoke
B
Poise
C
m²/sec
D
N-m/sec

Question 37Single Answer

__________ in the fuel is oxidised during knocking .

A
Hydrocarbon
B
Phosphorous
C
Water
D
Coal

Question 38Single Answer

_________ is defined as the ability of a material to resist deformation under action of an external load .

A
Stiffness
B
Resilience
C
Brittleness
D
Toughness

Question 39Single Answer

Draught is produced in locomotive boilers by which of the following components ?

A
Locomotive
B
Steam jet
C
Centrifugal fan
D
Chimney

Question 40Single Answer

For a steady flow, the value of all fluid properties at any fixed point _________ .

A
do not change with location
B
change with time
C
change with location
D
do not change with time

Question 41Single Answer

For a floating body, if the metacentre is below the centre of gravity, then the body is said to be __________ equilibrium .

A
thermal
B
stable
C
unstable
D
neutral

Question 42Single Answer

________ is useful for measuring flow of a conducting fluid .

A
Orifice meter
B
Rotameter
C
Vane meter
D
Electro-magnetic flow meter

Question 43Single Answer

A two- stroke engine consists of ________ port (s)

A
Three
B
Four
C
One
D
Two

Question 44Single Answer

Air Cooling is mostly preferred for _________ .

A
heavy truck
B
buses
C
moto cycles
D
multi-utility vehicles

Question 45Single Answer

_______ valves are provided in reciprocating compressors .

A
Simply supported
B
Solenoid
C
Plate
D
Poppet

Question 46Single Answer

Benson boiler have ______ water drum (s)

A
One
B
Zero
C
Three
D
Two

Question 47Single Answer

_________ is used for pumping water into a boilers .

A
Economiser
B
Duplex pump
C
Feed pump
D
Rotor

Question 48Single Answer

The function of a carburetor in internal combustion engines is :

A
to control fuel alone
B
to cool exhaust gases
C
to maintain air-fuel ratio
D
to control air alone

Question 49Single Answer

The device which transfers energy from the ______ to _____ the is known as hydraulic turbine .

A
atmosphere; fluid
B
rotor; fluid
C
fluid; rotor
D
fluid; atmosphere

Question 50Single Answer

The flash chamber in the single stage VCR cycle serves to ________ .

A
decrease the compression ratio
B
increase the refrigerating effect
C
increase the compression ratio
D
decrease the refrigerating effect

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Technical Subject (Mechanical)

Question 51Single Answer

Define thermodynamics .

A
It is a science which deals with the relation between heat, work and properties of systems
B
It is a science which deals with work done
C
It deals with dynamics under thermal conditions
D
It is science which deals with the relation between work and properties

Question 52Single Answer

Which of the following statements is correct about a Benson boiler ?

A
Air is sent through the same direction
B
There is no recirculation of water
C
Steam is sent out in multiple directions
D
Flue gases pass only in one direction

Question 53Single Answer

Within a refrigeration system, the expansion valve is incorporated between the ________ .

A
Super-heater and sub-cooler
B
compressor and condenser
C
evaporator and compressor
D
condenser and evaporator

Question 54Single Answer

The reversed ______ cycle employed for passenger aircraft systems .

A
Carnot
B
Atkinson
C
Ericsson
D
Brayton

Question 55Single Answer

Fusible plug in a steam boiler is placed ______ .

A
below the water level indicator
B
at he crown of the furnace
C
at the fire grate of the boiler
D
near the manhole

Question 56Single Answer

What is an ideal fluid?

A
A fluid that is incompressible and has zero viscosity.
B
A fluid that is compressible and has zero viscosity.
C
A fluid that is incompressible and has high viscosity.
D
A fluid that is compressible and has high viscosity.

Question 57Single Answer

What is a real fluid?

A
A fluid that is incompressible and has zero viscosity.
B
A fluid that is compressible and has zero viscosity.
C
A fluid that has viscosity and may be compressible.
D
A fluid that is always incompressible.

Question 58Single Answer

What are Newtonian fluids?

A
Fluids that obey Newton's law of viscosity.
B
Fluids that do not obey Newton's law of viscosity.
C
Fluids that are incompressible.
D
Fluids that are compressible.

Question 59Single Answer

What are Non-Newtonian fluids?

A
Fluids that obey Newton's law of viscosity.
B
Fluids that do not obey Newton's law of viscosity.
C
Fluids that are incompressible.
D
Fluids that are compressible.

Question 60Single Answer

What is the SI unit of mass density?

A
kg/m³
B
N/m²
C
kg/m²
D
N/m³

Question 61Single Answer

What is the SI unit of specific weight?

A
kg/m³
B
N/m²
C
N/m³
D
kg/m²

Question 62Single Answer

What is the SI unit of specific volume?

A
m³/kg
B
kg/m³
C
N/m²
D
N/m³

Question 63Single Answer

What is specific gravity?

A
The ratio of the density of a substance to the density of water.
B
The weight of a substance per unit volume.
C
The mass of a substance per unit volume.
D
The force per unit area exerted by a fluid.

Question 64Single Answer

What is viscosity?

A
The resistance of a fluid to flow.
B
The weight of a fluid per unit volume.
C
The compressibility of a fluid.
D
The surface tension of a fluid.

Question 65Single Answer

What is the SI unit of viscosity?

A
Pascal-second (Pa.s)
B
Newton-meter (N.m)
C
Kilogram per cubic meter (kg/m³)
D
Newton per square meter (N/m²)

General Aptitude

Question 66Single Answer

I go to Madurai by —– Vaigai Express

A
a
B
an
C
some
D
the

Question 67Single 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 68Single 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 69Single 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 70Single 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 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

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 74Single 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 75Single 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 76Single 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 77Single Answer

Which of the following numbers is irrational ?

A
√49
B
0.125
C
√2
D
22/7

Question 78Single 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 79Single 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 80Single 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 81Single Answer

Sattriya dance form is famous in which of these states ?

A
Assam
B
Himachal Pradesh
C
Punjab
D
Tamil Nadu

Question 82Single Answer

Who is known as the "Missile Man of India"?

A
Dr. Homi J. Bhabha
B
Dr. Vikram Sarabhai
C
Dr. APJ Abdul Kalam
D
Dr. Satish Dhawan

Question 83Single Answer

Which is the longest river in India?

A
Yamuna
B
Ganges
C
Brahmaputra
D
Godavari

Question 84Single Answer

Who among the following was associated with Enlightenment philosophy?

A
Voltaire
B
Shakespeare
C
Erasmus
D
All of the above

Question 85Single Answer

Which state is hosting the National SARAS Mela 2025?

A
Karnataka
B
Maharashtra
C
Kerala
D
Gujarat

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Latest BEL Trainee Engineer Mechanical Exam Question (Objective Questions), MCQ in English

Technical Subject (Mechanical)

BEL Trainee Engineer Mechanical Exam Online Question Bank Package

Technical Subject (Mechanical)

General Aptitude

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