Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 84 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

The radiation pyrometers work on the principle of ______
A. Newton's law
B. Stefan Boltzmann's law
C. Zeroth law
D. None of the above
Answer» C. Zeroth law
Discussion
2.

A flat surface can be produced by a lathe machine, if the cutting tool moves _____
A. parallel to the axis of rotation of workpiece
B. perpendicular to the axis of rotation of workpiece
C. at an angle of 45°
D. none of the above
Answer» C. at an angle of 45°
Discussion
3.

Casting replica used to make the cavity is called as
A. Mould
B. Pattern
C. Cope
D. None of the above
Answer» C. Cope
Discussion
4.

Thermal efficiency of S.I. engines is low, due to ____
A. low compression ratio
B. high compression ratio
Answer» B. high compression ratio
Discussion
5.

In roller bearings which type of rolling elements are used?
A. Cylindrical rollers
B. Taper rollers
C. Spherical rollers
D. All of the above
Answer» E.
Discussion
6.

Pump transfers input mechanical energy of an engine, into ______
A. pressure energy of a fluid
B. kinetic energy of a fluid
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion
7.

Which of the following is a power transmitting element?
A. Nuts and bolts
B. Sprockets and chains
C. Axles
D. All of the above
Answer» C. Axles
Discussion
8.

The shaft directly connected to the power source is called as ______
A. line shaft
B. counter shaft
C. both a. and b.
D. none of the above
Answer» B. counter shaft
Discussion
9.

Which of the following is a machine shaft?
A. Line shaft
B. Counter shaft
C. Crankshaft
D. All of the above
Answer» D. All of the above
Discussion
10.

Machine elements such as bearings are _________
A. holding type elements
B. supporting type elements
C. power transmitting elements
D. all of the above
Answer» C. power transmitting elements
Discussion
11.

Which flat belt drive system has two pulleys mounted on driven shaft and one pulley on driving shaft?

A. Multiple belt drive
B. Cone pulley drive
C. Fast and loose pulley drive
D. None of the above
Answer» D. None of the above
Discussion
12.

Smoke tube boilers have large water to steam ratio, hence _____
A. have high evaporation rates
B. are slow in operations
C. temperature stresses inducing failure of feed water arrangement are maximum
D. all of the above
Answer» C. temperature stresses inducing failure of feed water arrangement are maximum
Discussion
13.

Which process squeezes metals into peaks and troughs with plastic deformation?
A. Grooving
B. Knurling
C. Reaming
D. None of the above
Answer» C. Reaming
Discussion
14.

In four stroke cycle engine, cycle is completed in ______
A. two strokes of the piston
B. two revolutions of the crankshaft
C. three strokes of the piston
D. four revolutions of the crankshaft
Answer» C. three strokes of the piston
Discussion
15.

Which of the following statements are false for belt drives? 1. Belt drive is used in applications having constant speed drive 2. Belt drives can be used at extremely high speeds 3. Belt drives have low power transmitting capacity 4. Belt drives need continuous lubrication
A. 1 and 2
B. 1, 2 and 3
C. 2, 3 and 4
D. 1, 2 and 4
Answer» E.
Discussion
16.

Which of the following statements are false for reaction turbines? 1. Flow of water can be regulated without any losses 2. It works on the principle of impulse and reaction 3. They are suitable for low heads 4. Water flows at constant atmospheric pressure over the runner
A. 1, 2 and 3
B. 2 and 4
C. 1 and 4
D. 1, 2, 3 and 4
Answer» D. 1, 2, 3 and 4
Discussion
17.

Which type of bearings are known as anti friction bearings?
A. Sliding contact bearings
B. Rolling contact bearings
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
18.

Why is the load carrying capacity low in ball bearings? 1. Due to line contact between inner race and the ball 2. Due to greater axial dimensions 3. Due to less radial dimensions 4. Due to point contact between inner race and the ball
A. 1 and 3
B. only 1
C. only 4
D. 2 and 4
Answer» D. 2 and 4
Discussion
19.

Cylindrical roller bearings have greater _____
A. axial load carrying capacity
B. thrust load carrying capacity
C. radial load carrying capacity
D. all of the above
Answer» D. all of the above
Discussion
20.

What is the average temperature required for hot forging of aluminium alloys?
A. 1100 °C to 1200 °C
B. 350 °C to 525 °C
C. 2000 °C to 2500 °C
D. None of the above
Answer» C. 2000 °C to 2500 °C
Discussion
21.

Determine torque transmitted on the pinion shaft if torque transmitted on gear shaft is 20 Nm. Consider Gear ratio = 4
A. 8 Nm
B. 5 Nm
C. 80 Nm
D. 16 Nm
Answer» C. 80 Nm
Discussion
22.

Which of the following statements is/are true for gear drives?
A. They can be used for long centre distances
B. They are used to transmit power between non-intersecting and parallel shafts
C. They cannot be used for high reduction ratios
D. All of the above
Answer» C. They cannot be used for high reduction ratios
Discussion
23.

At forging temperature when a compressive force is applied on the material, it deforms
A. elastically in the direction of least resistance
B. elastically in the direction of maximum resistance
C. plastically in the direction of least resistance
D. plastically in the direction of maximum resistance
Answer» D. plastically in the direction of maximum resistance
Discussion
24.

The process of chamfering the entrance of a drilled hole is known as_____
A. counter-boring
B. counter-sinking
C. counter-fillet
D. trepanning
Answer» C. counter-fillet
Discussion
25.

Which of the following statements is/are false for machine tools? 1. Pillar drilling machine drills holes up to 75 mm 2. Regulating wheel is a component of surface grinding machine 3. Sensitive drilling machine is also known as bench drilling machine 4. The chuck of an internal grinding machine placed in tailstock is driven by an electric motor
A. Only 1
B. 2 and 4
C. 1 and 3
D. All of the above
Answer» C. 1 and 3
Discussion
26.

Which of the following operations is/are performed on a lathe machine?
A. Spot-facing
B. Parting
C. Reaming
D. All of the above
Answer» C. Reaming
Discussion
27.

According to Grashof's law in a four bar chain, one link can complete a rotation only if ________
A. (sum of longest and shortest link length) ≥ (sum of the remaining two link lengths)
B. (sum of longest and shortest link length) ≤ (sum of the remaining two link lengths)
C. (sum of longest and shortest link length) = (sum of the remaining two link lengths)
D. None of the above
Answer» C. (sum of longest and shortest link length) = (sum of the remaining two link lengths)
Discussion
28.

Which of the following factors reduce strength of casted components?
A. Blow holes
B. Gas cavities
C. Non-metallic incursions
D. All of the above
Answer» E.
Discussion
29.

On drilling machine, which process is known as reaming?
A. Enlargement of existing hole
B. Hole made by removal of metal along the hole circumference
C. Smoothly finishing and accurately sizing a drilled hole
D. All of the above
Answer» D. All of the above
Discussion
30.

Which of the following is a mechanism for mechanized movements of the carriage along longitudinal axis?
A. Cross-slide
B. Compound rest
C. Apron
D. Saddle
Answer» D. Saddle
Discussion
31.

The function of taper turning process is to ____
A. reduce the diameter of a workpiece along its length
B. reduce the diameter by removing material about an axis offset from the axis of workpiece
C. remove the material from end surface of a workpiece
D. all of the above
Answer» B. reduce the diameter by removing material about an axis offset from the axis of workpiece
Discussion
32.

The process of bevelling sharp ends of a workpiece is called as ________
A. knurling
B. grooving
C. facing
D. chamfering
Answer» E.
Discussion
33.

In an isolated system, ________ can be transferred between the system and its surrounding.
A. only energy
B. only mass
C. both energy and mass
D. neither energy nor mass
Answer» E.
Discussion
34.

Which of the following is an extensive property?
A. Volume
B. Pressure
C. Viscosity
D. All of the above
Answer» B. Pressure
Discussion
35.

What are the minimum number of kinematic pairs required in a kinematic chain?
A. 2 kinematic pairs
B. 3 kinematic pairs
C. 4 kinematic pairs
D. None of the above
Answer» D. None of the above
Discussion
36.

How is absolute pressure measured?
A. Gauge pressure + Atmospheric pressure
B. Gauge pressure – Atmospheric pressure
C. Gauge pressure / Atmospheric pressure
D. None of the above
Answer» B. Gauge pressure – Atmospheric pressure
Discussion
37.

An isobaric process, has constant _____
A. density
B. pressure
C. temperature
D. volume
Answer» C. temperature
Discussion
38.

The extensive properties of a system, _______
A. are independent of the mass of the system
B. depend upon temperature of the system
C. depend upon the mass of the system
D. none of the above
Answer» D. none of the above
Discussion
39.

Lancashire boilers are ______
A. externally fired boilers
B. internally fired boilers
C. both a. and b.
D. none of the above
Answer» C. both a. and b.
Discussion
40.

Which of the following energy conversion devices convert heat into work?
A. Electrical generators
B. I. C engines
C. Condensers
D. All of the above
Answer» C. Condensers
Discussion
41.

The plastic materials which do not undergo chemical change when heated are ____
A. Thermoplasts
B. Thermosets
C. Both a. and b.
D. None of the above
Answer» B. Thermosets
Discussion
42.

Which of the following is not a reason to design and redesign a product?
A. Optimum design
B. Innovation
C. Appearance
D. None of the above
Answer» E.
Discussion
43.

Beam engine mechanism is an example of
A. double crank mechanism
B. double lever mechanism
C. crank and lever mechanism
D. none of the above
Answer» D. none of the above
Discussion
44.

Which of the following inversions of four bar chain, convert oscillatory motion from one lever to another lever?
A. Ackermann steering gear mechanism
B. Beam engine mechanism
C. Coupled wheels of locomotive
D. All of the above
Answer» B. Beam engine mechanism
Discussion
45.

In which of the following processes, material is neither added nor removed but is deformed into desired shape?
A. Surface finishing process
B. Metal forming process
C. Casting
D. Machining
Answer» C. Casting
Discussion
46.

The process of creating mechanisms and shapes of mechanical elements for a machine to get the desired output for a given input is called as ___
A. analysis
B. innovation
C. synthesis
D. designing
Answer» D. designing
Discussion
47.

Which of the following is a not a surface finishing process?
A. Honing
B. Buffing
C. Lapping
D. Turning
Answer» E.
Discussion
48.

The component deforming progressively under load at high temperatures is called as
A. Resilience
B. Creep
C. Fatigue
D. All of the above
Answer» C. Fatigue
Discussion
49.

Which of the following ferrous alloys can be casted into intricate shapes?
A. Plain carbon steels
B. Alloy steels
C. Cast irons
D. All of the above
Answer» D. All of the above
Discussion
50.

Which of the following component(s) is/are manufactured by powder metallurgy processes?
A. Gears
B. Cutting tools
C. Bearing bushes
D. All of the above
Answer» E.
Discussion