Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 446 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.

In cross or regular lay ropes_________________?
A. direction of twist of wires in strands is opposite to the direction of twist of strands
B. direction of twist of wires and strands are same
C. wires in two adjacent strands are twisted in opposite direction
D. wires are not twisted
E. none of the above
Answer» B. direction of twist of wires and strands are same
Discussion
2.

In V-belt drive, belt touches______________?
A. at bottom
B. at sides only
C. both at bottom and sides
D. could touch anywhere
E. none of the above
Answer» C. both at bottom and sides
Discussion
3.

The rated life of a bearing varies___________________?
A. directly as load
B. inversely as square of load
C. inversely as cube of load
D. inversely as fourth power of load
E. none of the above
Answer» D. inversely as fourth power of load
Discussion
4.

In hydrostatic bearings ____________________?
A. the Oil film pressure is generated only by the rotation of the journal
B. the oil film is maintained by supplying oil under pressure
C. do not require external supply of lubricant
D. grease is used for lubrication
E. none of the above
Answer» C. do not require external supply of lubricant
Discussion
5.

Aircraft body is usually fabricated by_________________?
A. welding
B. precasting
C. rivetting
D. casting
E. unconventional methods
Answer» D. casting
Discussion
6.

If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?
A. ZN/p
B. p/ZN
C. Z/pN
D. N/Zp
E. Zp/N
Answer» B. p/ZN
Discussion
7.

In hydrodynamic bearings_____________________?
A. the oil film pressure is generated only by the rotation of the journal
B. the oil film is maintained by supplying oil under pressure
C. do not require external supply of lubricant
D. grease is used for lubrication
E. none of the above
Answer» B. the oil film is maintained by supplying oil under pressure
Discussion
8.

If a spring is cut down into two springs, the stiffness of cut springs will be _________________?
A. half
B. same
C. double
D. unpredictable
E. none of the above
Answer» D. unpredictable
Discussion
9.

Form coefficient of spring is _____________________?
A. ratio of coil diameter to wire diameter
B. load required to produce unit deflection
C. its capability of storing energy
D. concerned With strength of wire of spring
E. nothing
Answer» D. concerned With strength of wire of spring
Discussion
10.

A deep groove ball bearing rotating at 1200 r.p.m. is subjected to radial and an axial force of 2000 N and 1500 N respectively. What will be the basic dynamic capacity of bearing if 20,000 hours is the rating life? (Consider radial factor = 0.55, Thrust factor = 2 & application factor = 1.5?
A. 69.448 kN
B. 54.498 kN
C. 50.236 kN
D. 12.726 kN
Answer» B. 54.498 kN
Discussion
11.

A hot short metal is_________________?
A. brittle when cold
B. brittle when hot
C. brittle under all conditions
D. ductile at high temperature
E. hard when hot
Answer» C. brittle under all conditions
Discussion
12.

If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited ________________?
A. square
B. acme
C. buttress
D. BSW
E. metric
Answer» D. BSW
Discussion
13.

In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia of rivet d should be equal to__________________?
A. d
B. 1.25 d
C. 1.5 d
D. 1.75 d
E. 2 d
Answer» D. 1.75 d
Discussion
14.

What is Scuffing?
A. Lubrication failure
B. Surface fatigue failure
C. Surface injury on matting teeth surfaces
D. Wear due to chemical action by lubricants
Answer» B. Surface fatigue failure
Discussion
15.

The property of a material which enables it to resist fracture due to high impact loads is known as__________________?
A. elasticity
B. endurance
C. strength
D. toughness
E. resilience
Answer» E. resilience
Discussion
16.

Which type of stress is induced in a screw thread ?
A. Torsional shear stress
B. Buckling load
C. Bearing pressure
D. All of the above
Answer» D. All of the above
Discussion
17.

If threads on a bolt are left hand, threads on nut will be_____________________?
A. right hand with same pitch
B. left hand with same pitch
C. could be left or right hand
D. right hand with fine pitch
E. left hand with fine pitch
Answer» C. could be left or right hand
Discussion
18.

What is the Wahl's factor if spring index is 6?
A. 1.477
B. 0.995
C. 1.252
D. None of the above
Answer» D. None of the above
Discussion
19.

In design process, which step is followed after defining the problem?
A. Analysis
B. Synthesis
C. Optimization
D. Evaluation
Answer» C. Optimization
Discussion
20.

What is the step ratio for R40 series?
A. 1.44
B. 1.05
C. 4.0
D. 0.4
Answer» C. 4.0
Discussion
21.

Punching operation is an example of
A. Static load
B. Impact load
C. Fluctuating load
D. None of the above
Answer» C. Fluctuating load
Discussion
22.

Which of the following factors are not considered while selecting values for factor of safety?
A. Cost
B. Failure consequences
C. Degree of uncertainty about loading and material
D. None of the above
Answer» E.
Discussion
23.

The ratio of endurance strength and allowable stress is used to determine FOS for _____
A. fatigue loading
B. static loading of brittle materials
C. static loading of ductile materials
D. all of the above
Answer» B. static loading of brittle materials
Discussion
24.

To predict failure in design components which failure criteria is not assumed, when mean stress and stress amplitude are nonzero?
A. Goodman criterion
B. Soderberg criteria
C. Gerber criteria
D. None of the above
Answer» E.
Discussion
25.

Torsional Shear Stress is the stress induced when a component is subjected to equal and opposite _______.
A. forces acting in perpendicular direction
B. couples acting in perpendicular direction
C. couples acting in parallel planes
D. forces acting in parallel direction
Answer» D. forces acting in parallel direction
Discussion
26.

What is bearing pressure?
A. Compressive force acting on the contact area between two components having relative motion between them
B. Tensile stress acting on the contact area between two components having relative motion between them
C. Compressive force acting on the contact area between two components having no relative motion between them
D. Compressive stress acting on the contact area between two components having relative motion between them
Answer» E.
Discussion
27.

Applications in which stresses are encountered in one direction only uses following type of threads____________________?
A. metric
B. buttress
C. acme
D. square
E. BSW
Answer» C. acme
Discussion
28.

Calculate torque required to overcome thread friction if axial load of 8 kN acts on a power screw having double start square threads of 30 mm mean diameter. Friction angle and lead angle are 7° and 9° respectively
A. 68.81 N-m
B. 41.90 N-m
C. 34.40 N-m
D. Insufficient data
Answer» D. Insufficient data
Discussion
29.

Drilling axial hole is a method used to achieve ______
A. uniform strength
B. uniform stress
C. uniform toughness
D. all of the above
Answer» B. uniform stress
Discussion
30.

Calculate fatigue stress concentration factor, when theoretical stress concentration factor is 1.62 and notch sensitivity is equal to 0.9
A. 1.558
B. 3.358
C. 1.162
D. None of the above
Answer» B. 3.358
Discussion
31.

Why are rigid couplings used?
A. To connect diesel engine and generator
B. To connect eccentric shafts
C. To connect electric motor to pump
D. None of the above
Answer» D. None of the above
Discussion
32.

In power screws, if friction angle Φ is less than lead angle λ, then the screw undergoes _______
A. over hauling
B. self locking
C. both a. and b.
D. none of the above
Answer» B. self locking
Discussion
33.

Which type of stress is induced in a screw body?
A. Bearing pressure
B. Direct shear stress
C. Torsional shear stress
D. None of the above
Answer» D. None of the above
Discussion
34.

The efficiency of power screw can be improved if ______
A. the rolling friction is replaced by sliding friction in the screw threads
B. the sliding friction is replaced by rolling friction in the screw threads
C. both a. and b.
D. none of the above
Answer» C. both a. and b.
Discussion
35.

Threads used in screw fasteners are ______
A. having high strength
B. having low efficiency
C. single start type
D. all of the above
Answer» E.
Discussion
36.

The application factor depends on ______
A. prime mover
B. hours of operation per day
C. machine driven
D. all of the above
Answer» E.
Discussion
37.

What are assumptions made during stress analysis of curved beams?
A. The material is nonisotropic
B. The material is non homogeneous
C. The material obeys hooke's law
D. All of the above
Answer» D. All of the above
Discussion
38.

What is meant by application factor?
A. Ratio of maximum torque and average torque
B. Ratio of maximum load and average load
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
39.

What is meant by Aesthetics?
A. Interaction between man machine working environment
B. Appearance of the product
C. Both a. and b.
D. None of the above
Answer» B. Appearance of the product
Discussion
40.

Series of numbers offered by arithmetic progression are called as preferred series
A. True
B. False
Answer» C.
Discussion
41.

Which among the following is a knuckle joint?
A. Tension link in bridge structure
B. Foundation bolt
C. Both a. and b.
D. None of the above
Answer» B. Foundation bolt
Discussion
42.

Which material cannot be used to manufacture shafts?
A. Plain carbon steels
B. Cast iron
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
43.

Which among the following is a type of transmission shaft?
A. Spindle shaft
B. Crankshaft
C. Counter shaft
D. All of the above
Answer» D. All of the above
Discussion
44.

What does the designation M 16 x 2 indicate?
A. I.S.O. Metric fine thread
B. I.S.O. Metric coarse thread
C. B.S.F. Metric coarse thread
D. B.S.F Metric fine thread
Answer» B. I.S.O. Metric coarse thread
Discussion
45.

Which of the following statements is/are false for an axle?
A. It is used to support rotating machine elements
B. It can transmit torque
C. It is subjected to axial force
D. All of the above
Answer» C. It is subjected to axial force
Discussion
46.

Which factors are responsible for the failure of a component due to buckling?
A. Yielding
B. Plastic deformation
C. Elastic instability
D. All of the above
Answer» D. All of the above
Discussion
47.

Which type of key consists of two square tapered keys placed 90° apart?
A. Tangent key
B. Kennedy key
C. Saddle key
D. Woodruff key
Answer» C. Saddle key
Discussion
48.

Determine torque required to overcome collar friction in square threaded screw, if coefficient of friction is 0.12 and axial force of 20 kN is exerted by the screw. Mean radius of friction collar is 20 mm
A. 48000 N-mm
B. 120 N-mm
C. 4800 N-mm
D. 12000 N-mm
Answer» B. 120 N-mm
Discussion
49.

In S-N diagram, the graph plotted between fatigue strength and number of stress cycles becomes horizontal for which type of materials?

A. Ferrous materials
B. Non-ferrous materials
C. Both a. and b.
D. None of the above
Answer» B. Non-ferrous materials
Discussion
50.

Calculate lead angle of a thread which has mean diameter of 45 mm and lead of 10 mm
A. 8.5°
B. 4.04°
C. 3.02°
D. None of the above
Answer» C. 3.02°
Discussion