Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 77 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.

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
2.

Which of the following statements is/are true for alloy steels?

A. They contain carbon more than 1.7%
B. They are ductile
C. They have low resilience and toughness
D. All of the above
Answer» C. They have low resilience and toughness
Discussion
3.

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
4.

Which of the following statements is/are true for mechanisms?

A. A slider crank mechanism is formed, if one link in slider crank chain is fixed
B. Three kinematic links joined together forms a mechanism
C. Kinematic chain is a part of kinematic pair
D. All of the above
Answer» B. Three kinematic links joined together forms a mechanism
Discussion
5.

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
6.

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
7.

Why is an idler gear used in gear trains?

A. To obtain minimum centre distance between driving and driven shaft
B. To have required direction of rotation
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
8.

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
9.

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
10.

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
11.

Which of the following relations depict relation between Celsius and Fahrenheit scale?

A. (°C / 5) = (°F – 32) / 9
B. (°C / 9) = (°F – 32) / 5
C. (°C / 32) = (°F – 9) / 5
D. None of the above
Answer» B. (°C / 9) = (°F – 32) / 5
Discussion
12.

Which of the following protects penstock due to sudden variation of flow or velocity of water?

A. Anchors
B. Forebays
C. Trash rack
D. Surge tank
Answer» E.
Discussion
13.

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
14.

Which of the following materials do not have a well defined yield point?

A. Heat treated steel
B. Concrete
C. Carbon fiber
D. All of the above
Answer» E.
Discussion
15.

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
16.

Which of the following is not a property of copper alloy?

A. High electrical conductivity
B. High thermal conductivity
C. High strength
D. None of the above
Answer» D. None of the above
Discussion
17.

Which of the following is an inversion of four bar chain?

A. Coupled wheels of locomotive
B. Whitworth quick return mechanism
C. Reciprocating air compressor
D. Hand pump
Answer» B. Whitworth quick return mechanism
Discussion
18.

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
19.

Which of the following is a not a surface finishing process?

A. Honing
B. Buffing
C. Lapping
D. Turning
Answer» E.
Discussion
20.

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
21.

Which of the following is a characteristic of Polytetra-flouro-ethylene?

A. High coefficient of friction
B. Tough at high temperature
C. Resistance to chemical attack
D. All of the above
Answer» D. All of the above
Discussion
22.

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
23.

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
24.

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
25.

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
26.

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
27.

Which gears are used to connect two intersecting shaft axes?

A. Crossed helical gear
B. Worm and worm wheel
C. Bevel gears
D. All of the above
Answer» D. All of the above
Discussion
28.

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
29.

Which design consideration deals with appearance of the product?

A. Ergonomics
B. Aesthetics
C. System design
D. Creative design
Answer» C. System design
Discussion
30.

Which body transmits force with negligible deformation?

A. Elastic body
B. Resistant body
C. Deforming body
D. All of the above
Answer» C. Deforming body
Discussion
31.

What is the primary function of mechanism?

A. Power transmission
B. Power absorption
C. Force transmission
D. Motion transmission
Answer» E.
Discussion
32.

What is the percentage of carbon in plain carbon steel?

A. 60 to 80%
B. Less than 1.7%
C. Less than 7%
D. None of the above
Answer» C. Less than 7%
Discussion
33.

What is the function of a moderator?

A. Increases the speed of neutrons
B. Increases the speed of electrons
C. Reduces the speed of neutrons
D. Reduces the speed of electrons
Answer» D. Reduces the speed of electrons
Discussion
34.

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
35.

What is meant by gear ratio?

A. The ratio of pinion speed and gear speed
B. The ratio of number of teeth on pinion and number of teeth on gear
C. Both a. and b.
D. None of the above
Answer» B. The ratio of number of teeth on pinion and number of teeth on gear
Discussion
36.

What is meant by drag in casting process?

A. Upper part of casting flask
B. Molten metal
C. Lower part of casting flask
D. Upper and lower part of casting flask
Answer» D. Upper and lower part of casting flask
Discussion
37.

What are the number of sliding and turning pairs in a slider crank mechanism?

A. 1 sliding pair and 3 turning pairs
B. 2 sliding pairs and 2 turning pairs
C. 3 sliding pairs and 1 turning pair
D. None of the above
Answer» B. 2 sliding pairs and 2 turning pairs
Discussion
38.

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
39.

Thermal efficiency of S.I. engines is low, due to ____

A. low compression ratio
B. high compression ratio
Answer» B. high compression ratio
Discussion
40.

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
41.

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
42.

The process of joining similar or dissimilar materials by heating them below 450o C using non-ferrous filler material is called as ______

A. Brazing
B. Soldering
C. Welding
D. All of the above
Answer» C. Welding
Discussion
43.

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
44.

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
45.

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
46.

The objective of considering ergonomics in machine design is to ____ 1. decrease physical stresses 2. make user adapt to the machine 3. make machine fit for the user 4. improve appearance of the product

A. only 2
B. 3 and 4
C. 1 and 3
D. 1, 3 and 4
Answer» D. 1, 3 and 4
Discussion
47.

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
48.

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
49.

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
50.

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