Explore topic-wise MCQs in Mechanical Engineering.

This section includes 243 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.

151.

of jet engine?

A. turbojet
B. ramjet
C. scramjet
D. propulsive jet
Answer» E.
Discussion
152.

A jet strikes a curved plate at its

A. sides
B. surface
C. centre
D. does not strike
Answer» D. does not strike
Discussion
153.

Jet propulsion of ship is less efficient than screw propeller due to

A. pressure
B. temperature
C. frictional losses
D. wear and tear
Answer» D. wear and tear
Discussion
154.

from the sea can be taken by the pump.

A. true
B. false
Answer» B. false
Discussion
155.

If the pressure remains a constant, then

A. vr1 > vr2
B. vr1 < vr2
C. vr1 = vr2
D. vr1 is a zero
Answer» D. vr1 is a zero
Discussion
156.

If the friction is neglected, then

A. vr1 > vr2
B. vr1 < vr2
C. vr1 = vr2
D. vr1 is a zero
Answer» D. vr1 is a zero
Discussion
157.

The relative velocity is obtained by the equation

A. u – v1
B. v1
C. u*v1
D. u/v1
Answer» B. v1
Discussion
158.

How is absolute velocity at inlet denoted?

A. v
B. v1
C. c
D. v
Answer» C. c
Discussion
159.

Jet propulsion works on the principle of

A. newton’s first law
B. newton’s second law
C. newton’s third law
D. thermodynamic properties
Answer» D. thermodynamic properties
Discussion
160.

The force analysis on a curved vane is understood using

A. velocity triangles
B. angle of the plate
C. vane angles
D. plate dimensions
Answer» B. angle of the plate
Discussion
161.

fluid mechanics deals with heat transfer. It is

A. backward direction
B. forward direction
C. perpendicular direction
D. parallel movement
Answer» C. perpendicular direction
Discussion
162.

symbol for Froude number?

A. f
B. fo
C. fr
D. f
Answer» D. f
Discussion
163.

utilization of

A. accelerating mass
B. volume
C. work
D. velocity
Answer» D. velocity
Discussion
164.

Which among the following is the standard symbol for Darcy friction factor?

A. f
B. fd
C. c
D. cd
Answer» C. c
Discussion
165.

Which among the following is the formula for Knudsen number?

A. λ⁄l
B. λ⁄2l
C. λ⁄3l
D. λ⁄4l
Answer» B. λ⁄2l
Discussion
166.

Fanning friction factor is

A. 0.25 times darcy friction factor
B. same as darcy friction factor
C. 2 times darcy friction factor
D. independent
Answer» B. same as darcy friction factor
Discussion
167.

symbol for Atwood number?

A. a
B. ar
C. ar
D. a
Answer» B. ar
Discussion
168.

Which among the following is the standard symbol for Archimedes number?

A. a
B. ar
C. ar
D. a
Answer» D. a
Discussion
169.

Which among the following is the standard symbol for Blake number?

A. bi
B. ba
C. bl
D. b
Answer» C. bl
Discussion
170.

spread is called

A. surface tension
B. diffusivity
C. viscosity
D. kinetics
Answer» C. viscosity
Discussion
171.

In similitude, Fapplication=Fmodel*3.44

A. true
B. false
Answer» B. false
Discussion
172.

Which among the following is a standard scale for a similitude?

A. 1:250
B. 1:50
C. 1:25
D. 1:100
Answer» D. 1:100
Discussion
173.

Physical similitude has exactly the same geometric shape of the prototype.

A. true
B. false
Answer» B. false
Discussion
174.

All the parameters in a similitude are described using

A. continuum mechanics
B. solid mechanics
C. diesel mechanics
D. aircraft mechanics
Answer» B. solid mechanics
Discussion
175.

Which among the following have the same forces acting on them?

A. geometric similarity
B. kinematic similarity
C. dynamic similarity
D. conditional similarity
Answer» D. conditional similarity
Discussion
176.

Which among the following have similar fluid streamlines?

A. geometric similarity
B. kinematic similarity
C. dynamic similarity
D. conditional similarity
Answer» C. dynamic similarity
Discussion
177.

A model of with same shape is

A. geometric similarity
B. kinematic similarity
C. dynamic similarity
D. conditional similarity
Answer» B. kinematic similarity
Discussion
178.

Which among the following is the main application for Similitude?

A. ships
B. cars
C. hydraulics
D. train
Answer» D. train
Discussion
179.

Similitude is a concept applicable to the testing of

A. mathematical models
B. physical models
C. engineering models
D. chemical models
Answer» D. chemical models
Discussion
180.

What happens when a bullet is fired from a rifle?

A. the rifle becomes weightless
B. we fall back
C. rifle gives backward kick
D. bullet doesn’t leave the rifle
Answer» D. bullet doesn’t leave the rifle
Discussion
181.

When a body is falling freely under gravity, the total mechanical energy remains constant because of which of the following?

A. law of conservation of energy
B. unification of force
C. electromagnetic force
D. gravity
Answer» B. unification of force
Discussion
182.

Gravitational force, despite being a weak force, governs the large scale motion.

A. true
B. false
Answer» B. false
Discussion
183.

Why is climbing a lamp post harder than climbing up a tree?

A. because of parallel friction force
B. because of contact force between the bodies
C. because of van der wall’s force
D. because of rope force
Answer» B. because of contact force between the bodies
Discussion
184.

Which of the following is an example of electromagnetic force?

A. motion of moon around earth
B. evolution of stars
C. evolution of galaxies
D. compression of spring
Answer» E.
Discussion
185.

Gravitational force is the weakest force in nature.

A. true
B. false
Answer» B. false
Discussion
186.

Which is the universal attractive force?

A. electromagnetic force
B. strong nuclear force
C. weak nuclear force
D. gravitational force
Answer» E.
Discussion
187.

Which of the following uses electromagnetic waves?

A. radio
B. radiotherapy
C. detecting fractures
D. electric motors
Answer» B. radiotherapy
Discussion
188.

Quantum physics deals with macroscopic phenomena.

A. true
B. false
Answer» C.
Discussion
189.

TOPIC 3.1 NEED FOR DIMENSIONAL ANALYSIS - METHODS OF DIMENSIONAL ANALYSIS

A. botanical science
B. zoological science
C. chemistry
D. physics
Answer» D. physics
Discussion
190.

Coefficient of friction of a laminar flow is

A. re/16
B. re/64
C. 16/re
D. 64/re
Answer» D. 64/re
Discussion
191.

Define Viscosity.

A. resistance to flow of object
B. resistance to flow of air
C. resistance to flow of fluid
D. resistance to flow of heat
Answer» D. resistance to flow of heat
Discussion
192.

The pipe diameter is

A. directly proportional to fluid density
B. directly proportional to mass flow rate
C. inversely proportional to mass flow rate
D. directly proportional to fluid velocity
Answer» C. inversely proportional to mass flow rate
Discussion
193.

How do we determine the total discharge through parallel pipes?

A. add them.
B. subtract them
C. multiply them
D. divide them
Answer» B. subtract them
Discussion
194.

If the two reservoirs are kept at the same level, the head loss is

A. z1-z2
B. zero
C. t2-t1
D. s2-s1
Answer» C. t2-t1
Discussion
195.

Which among the following is the correct formula for head loss?

A. z1-z2
B. c
C. t2-t1
D. s2-s1
Answer» B. c
Discussion
196.

that is developed in the pipe?

A. entry
B. exit
C. connection between two pipes
D. liquid velocity
Answer» E.
Discussion
197.

What is the total loss developed in a series of pipes?

A. sum of losses in each pipe only
B. sum of local losses only
C. sum of local losses plus the losses in each pipe
D. zero
Answer» D. zero
Discussion
198.

pipes can take up

A. pipes of different diameters
B. pipes of the same diameters only.
C. single pipe only
D. short pipes only
Answer» B. pipes of the same diameters only.
Discussion
199.

The total head loss for the system is equal to

A. pipe length
B. pipe diameter
C. width of the reservoir
D. height difference of reservoirs
Answer» E.
Discussion
200.

Relative roughness is

A. ϵ/d
B. ϵ*d
C. ϵ/dm
D. ϵgd
Answer» B. ϵ*d
Discussion