Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 55 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 discharge method provides only intermediate discharge for low speed flat belt conveyor?
A. Plow discharge
B. Tripper discharge
C. Both a. and b.
D. None of the above
Answer» B. Tripper discharge
Discussion
2.

Which criteria of failure is used to indicate St Venent's theory?
A. Maximum principle stress theory
B. Maximum principle strain theory
C. Shear stress theory
D. None of the above
Answer» C. Shear stress theory
Discussion
3.

What does DFMA stand for?
A. Design for Manual Assembly
B. Design for Manufacture and Assembly
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
4.

Assignable causes are caused due to changes in _________
A. manufacturing process
B. material
C. inspection process
D. all of the above
Answer» E.
Discussion
5.

Due to which effect, compressive residual stress of strain-hardening model is smaller than elastic-perfectly plastic model?
A. Seeback effect
B. Peltier effect
C. Bauschinger effect
D. None of the above
Answer» D. None of the above
Discussion
6.

Claviro's equation is applicable to cylinders with _______
A. close ends
B. open ends
C. both a. and b.
D. none of the above
Answer» B. open ends
Discussion
7.

Why is autofrettage process used in pressure vessels?
A. Increase fatigue lifetime
B. To enhance carrying capacity
C. To introduce compressive residual stress in them
D. All of the above
Answer» E.
Discussion
8.

Which equation is used to calculate thickness of an alloy steel cylinder with open ends?
A. Clavarino's equation
B. Birnie's equation
C. Lame's equation
D. None of the above
Answer» C. Lame's equation
Discussion
9.

What is the weld joint efficiency if pressure vessel is fabricated with single full fillet lap joint?
A. 1.0
B. 0.55
C. 0.65
D. 0.85
Answer» C. 0.65
Discussion
10.

Which equation is used to determine wall thickness for brittle materials?
A. Brinie's equation
B. Claviro's equation
C. Lame's equation
D. All of the above
Answer» D. All of the above
Discussion
11.

Which of the following statements is/are false if separate cylinder liner is pressed inside the cylinder of large engines?
A. Easy replacement of liner in case of wear and tear
B. Cheap grade material cannot be used for jacket
C. Liner is to be made of heat resistant cast iron
D. None of the above
Answer» C. Liner is to be made of heat resistant cast iron
Discussion
12.

Design pressure for unfired pressure vessels is 1.05 times of _______
A. minimum working pressure
B. maximum working pressure
C. hydrostatic test pressure
D. none of the above
Answer» C. hydrostatic test pressure
Discussion
13.

Single cylinder four stroke engine has brake power of 8 kW and brake mean effective pressure of 0.55 Mpa. What is the length of cylinder which is 1.2 times of bore diameter? (n = 3000 rpm)
A. 110 mm
B. 103 mm
C. 70 mm
D. 65 mm
Answer» C. 70 mm
Discussion
14.

Economic cutting speed is minimum if geometric ratio is _________
A. minimum
B. maximum
C. equal to economic cutting speed
D. none of the above
Answer» B. maximum
Discussion
15.

Which of the following belt conveyors have low volume carrying capacity?
A. Flat belts
B. Troughed belts
C. Both a. and b.
D. None of the above
Answer» B. Troughed belts
Discussion
16.

Which of the following principle recognizes human capabilities and limitations using design effective handling equipment?
A. Safety principle
B. Obsolescence principle
C. Ecology principle
D. Ergonomic principle
Answer» E.
Discussion
17.

Which type of welded joints are not included in class 3 pressure vessels?
A. Double welded butt joint with full penetration
B. Single welded but joint with back strip
C. Single full fillet lap joints
D. None of the above
Answer» D. None of the above
Discussion
18.

A machine tool has minimum speed of 100 r.p.m. How many speed steps are required by it to achieve speed of 200 rpm? (Geometric progression ratio = 1.06)
A. 11
B. 12
C. 13
D. 14
Answer» C. 13
Discussion
19.

In unfired pressure vessels, category A consists of _________
A. joints connecting flanges and flat heads
B. welded joints connecting nozzles with main shell
C. circumferential welded joints joints
D. longitudinal welded joints
Answer» E.
Discussion
20.

Which of the following parts of piston act as bearing for connecting rod side thrust?

A. Reinforcing ribs
B. Piston barrel
C. Piston gudgeon
D. Piston skirt
Answer» E.
Discussion
21.

Maximum and minimum diameter of a shaft to be machined is 100 mm and 80 mm respectively. What is the maximum spindle speed if cutting velocity is 40 m/min?
A. 120 r.p.m
B. 127 r.p.m
C. 160 r.p.m.
D. 636 r.p.m.
Answer» D. 636 r.p.m.
Discussion
22.

If a relief valve has reliability of 0.989, how many failures are expected in testing 1000 such relief valves?
A. 111
B. 100
C. 10
D. 11
Answer» E.
Discussion
23.

What is the geometric progression ratio if maximum and minimum spindle speeds are 500 r.p.m and 300 r.p.m respectively? (Number of speed steps = 7)
A. 0.91
B. 1.5
C. 1.08
D. 2.0
Answer» D. 2.0
Discussion
24.

What is the function of gudgeon pin?
A. Acts as stiffeners
B. Supports piston head
C. Connects piston to connecting rod
D. All of the above
Answer» D. All of the above
Discussion
25.

What is the relation between standard deviation(σ) and arithmetic mean (μ) to determine coefficient of variation (C)?
A. C = σ + μ
B. C = σ – μ
C. C = σ / μ
D. C = σ x μ
Answer» D. C = σ x μ
Discussion
26.

Which of the following methods is most efficient method of design of experiments (DOE)?
A. Factorial design
B. Fractional factorial design
C. Taguchi method
D. All of the above
Answer» D. All of the above
Discussion
27.

In which of the following designs, system provides its minimum critical function even after failure of the component?
A. Fail passive design
B. Fail active design
C. Fail operational design
D. None of the above
Answer» D. None of the above
Discussion
28.

What will be the number of tests required in an experiment to obtain maximum information based on factorial design if, number of levels and number of factors are 2 and 5 respectively?
A. 32
B. 25
C. 10
D. None of the above
Answer» B. 25
Discussion
29.

Selection of welding process does not depend on ___________
A. thickness of material
B. availability of equipments
C. economics of the process
D. none of the above
Answer» E.
Discussion
30.

Thermal stress in cylinder liners can be reduced by _______
A. increasing the wall thickness of cylinder liner
B. increasing velocity of flowing water through jacket
C. both a. and b.
D. none of the above
Answer» C. both a. and b.
Discussion
31.

Which of the following parameters are to be considered for parts with non rotational symmetry in machining process?
A. Avoid long parts
B. Avoid tin parts
C. Machined surfaces should be parallel to each other and with the base
D. All of the above
Answer» E.
Discussion
32.

Which of the following materials are used for cylinder liners?
A. Alloy cast iron
B. Grey cast iron
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
33.

Which stress is induced in cylinder wall due to side thrust of the piston?
A. Axial stress
B. Circumferential stress
C. Longitudinal stress
D. Bending stress
Answer» E.
Discussion
34.

Which of the following curves have the mean value equal to zero in the graph of frequency vs random variable?
A. Normal distribution curve
B. Standard normal distribution curve
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
35.

What is the maximum percentage loss of economic cutting speed if geometric progression ratio = 1.06 ?
A. 17.0 %
B. 11.5 %
C. 5.7 %
D. 2.9 %
Answer» E.
Discussion
36.

What does Ψ mean in Lagrange's equation (LE = U + λΨ)?
A. Lagrange's multipliers
B. Functional constraints
C. Multiple variable objective
D. None of the above
Answer» C. Multiple variable objective
Discussion
37.

Which of the following is not an unfired pressure vessel?
A. Heat exchanger
B. Storage vessels
C. Steam boilers
D. None of the above
Answer» D. None of the above
Discussion
38.

Which of the following is not expressed by primary design equation?
A. Functional parameters
B. Material parameters
C. Geometrical parameters
D. None of the above
Answer» E.
Discussion
39.

Which of the following statements is true for structure/speed diagrams?
A. Structure diagrams gives range ratio of spindle speeds
B. Speed diagrams do not give range ratio of spindle speeds
C. Speed diagrams consider motor speed
D. All of the above
Answer» D. All of the above
Discussion
40.

Which belt conveyor prevents sliding down of material at an inclination of 55° with horizontal?
A. Flat belt conveyor
B. Troughed belt conveyor
C. Blanket belt conveyor
D. Woven wire belt conveyors
Answer» D. Woven wire belt conveyors
Discussion
41.

What causes infant mortality in mechanical equipments?
A. Design errors
B. Manufacturing defects
C. Installation defects
D. All of the above
Answer» E.
Discussion
42.

Which of the following statements is false for troughed belt conveyors? 1. Troughed belt conveyors use flexible belts 2. They contain five idlers 3. Depth of trough decreases with increasing number of idlers 4. Flexibility of belt increases as depth of trough decreases
A. 1 and 2
B. 2 and 3
C. 3 and 4
D. None of the above
Answer» D. None of the above
Discussion
43.

What is meant by mean time to failure (MTTF)?
A. Mean time between two successive failure components
B. Maximum time between two successive failure components
C. Sum of survival time for number of components divided by number of failures
D. Sum of number of failures divided by survival time for number of components
Answer» D. Sum of number of failures divided by survival time for number of components
Discussion
44.

Diameter range is high in geometric progression due to _________ spindle speed.
A. low
B. high
C. constant
D. none of the above
Answer» B. high
Discussion
45.

What is the purpose of using a gear box?
A. To increase torque
B. To increase speed
C. Converts single input speed into multiple output speeds
D. All of the above
Answer» E.
Discussion
46.

Ratio of two spindle speeds is constant in _________ progression.
A. Arithmetic
B. Geometric
C. Harmonic
D. None of the above
Answer» C. Harmonic
Discussion
47.

What is harmonic progression?
A. Difference between reciprocal of two successive spindle speeds is constant
B. Difference between two successive spindle speeds is constant
C. Ratio of two successive spindle speeds is constant.
D. Ratio of two successive spindle speeds is variable.
Answer» B. Difference between two successive spindle speeds is constant
Discussion
48.

Which of the following is not a hoisting equipment with lifting gear?
A. Cage elevators
B. Jib cranes
C. Pulleys
D. Troughed belts
Answer» E.
Discussion
49.

What are bulk loads?
A. Lump of material
B. Single rigid mass
C. Homogeneous particles
D. Heterogeneous particles
Answer» C. Homogeneous particles
Discussion
50.

Which of the following processes is used for surface finishing?
A. Shaping
B. Broaching
C. Lapping
D. All of the above
Answer» D. All of the above
Discussion