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Elements of Machine Design Quiz

Total questions: 92

Worksheet time: 46mins

Name
Class
Date
1.

Ability of material to withstand load is called

a)

Ductility

b)

Strength

c)

Toughness

d)

Hardness

2.

Ability of material to be drawn into thin wire is called

a)

Ductility

b)

Strength

c)

Toughness

d)

Hardness

3.

Ability of material to resist shock loads is called

a)

Ductility

b)

Strength

c)

Toughness

d)

Hardness

4.

Ability of material to resist abrasion is called

a)

Ductility

b)

Strength

c)

Toughness

d)

Hardness

5.

Ability of material to be rolled into thin sheets is called

a)

Ductility

b)

Malleability

c)

Fatigue

d)

Creep

6.

Ability of material to resist bending is called

a)

Toughness

b)

Hardness

c)

Stiffness

d)

Strength

7.

The slow and continuous deformation under constant load is known as

a)

Fatigue

b)

Hardness

c)

Toughness

d)

Creep

8.

Failure of material under cyclic load at a stress below ultimate stress is known as

a)

Fatigue

b)

Hardness

c)

Toughness

d)

Creep

9.

In high alloy steel, total alloying elements >

a)

2%

b)

3%

c)

4%

d)

5%

10.

In low alloy steel, total alloying elements < ....

a)

2%

b)

3%

c)

4%

d)

5%

11.

Preferred numbers are designated by the

a)

K series

b)

R series

c)

L series

d)

P series

12.

R10 series stands for

a)

5 10

b)

10 10

c)

20 10

d)

2 10

13.

Load / Area is called

a)

Pressure

b)

Stress

c)

Stain

d)

Elongation

14.

Sl unit of stress is

a)

Kg / mm2

b)

Kg / cm2

c)

N .mm2

d)

N / mm2

15.

Change in length per original length is called

a)

Stress

b)

Elongation

c)

Pressure

d)

Strain

16.

Unit of strain is

a)

N

b)

Kg

c)

No unit

d)

mm

17.

Stress by strain is known as

a)

Bulk modulus

b)

Rigidity modulus

c)

Young's modulus

d)

Shear modulus

18.

Always value of Factor of safety is

a)

<= 0

b)

=0

c)

< 1

d)

>1

19.

For ductile material, FOS is

a)

Working stress / Ultimate stress

b)

Ultimate stress / Working stress

c)

Yield stress / Working stress

d)

Working stress / Yield stress

20.

For brittle materials, FOS is

a)

Working stress / Ultimate stress

b)

Ultimate stress / Working stress

c)

Yield stress / Working stress

d)

Working stress / Yield stress

21.

Modulus of rigidity is also called

a)

Yound's modulus

b)

Bulk modulus

c)

Shear modulus

d)

Modulus of elasticity

22.

Endurance limit is also called

a)

Elastic limit

b)

Plastic limit

c)

Fatigue limit

d)

Creep limit

23.

Unit of moment of Inertia (1) is

a)

mm4

b)

mm3

c)

mm2

d)

mm

24.

Unit of polar moment of Inertia (J) is

a)

mm4

b)

mm3

c)

mm2

d)

mm

25.

Unit of modulus of rigidity (G) is

a)

N/mm

b)

N / mm2

c)

mm/N

d)

N - mn

26.

Unit of Torque (T) is

a)

N/mm2

b)

N/mm

c)

N-mm

d)

N

27.

In BIS designation of alloy steel, the letter X denotes

a)

Carbon steel

b)

Free cutting steel

c)

High alloy steel

d)

Low alloy steel

28.

C45. Here 45 denotes

a)

45/100

b)

45/1000

c)

45/10

d)

45

29.

In BIS designation, high alloy tool steel is specified to by the letters

a)

T

b)

XT

c)

TX

d)

X

30.

Maximum principal normal stress theory is also called

a)

Guest's theory

b)

Henckey and mises theory

c)

Rankine's theory

d)

Taylor's theory

31.

Maximum shear stress theory is also called

a)

Guest's theory

b)

Henckey and mises theory

c)

Rankine's theory

d)

Taylor's theory

32.

Bearing stress is also called.

a)

Tensile stress

b)

Compressive stress

c)

Shear stress

d)

Crushing stress

33.

1 MN/m² is equal to

a)

1 N/mm²

b)

10 N/mm²

c)

100 N/mm²

d)

1000 n/mm²

34.

Young's modulus is also known as

a)

Shear modulus

b)

Modulus of rigidity

c)

Bulk modulus

d)

Modulus of elasticity

35.

1m is equal to

a)

10mm

b)

100mm

c)

1000mm

d)

106mm

36.

Which of the following is the first step in the design procedure?

a)

Factor of safety determination

b)

Review of force analysis

c)

Identification of design requirements

d)

Material selection

37.

What is the primary purpose of the factor of safety in mechanical design?

a)

To decrease cost

b)

To ensure durability under varying loads

c)

To minimize weight

d)

To increase production speed

38.

Stress concentration is caused by:

a)

Uniform cross-sections

b)

External load

c)

Changes in cross-sectional geometry

d)

Fatigue

39.

Which property measures a material's resistance to repeated loads?

a)

Creep

b)

Fatigue strength

c)

Tensile strength

d)

Hardness

40.

What is creep in materials?

a)

The gradual elongation of a material under stress over time

b)

Sudden failure under high load

c)

Change in shape due to temperature variations

d)

Resistance to impact forces

41.

Which fabrication method is best suited for producing complex geometries in metals?

a)

Casting

b)

Welding

c)

Forging

d)

Rolling

42.

Economic considerations in design primarily include:

a)

Safety factors

b)

Manufacturing costs and material usage

c)

Color and aesthetics

d)

Ergonomics

43.

Which of the following properties indicates the material's ability to absorb energy before fracturing?

a)

Ductility

b)

Toughness

c)

Hardness

d)

Creep resistance

44.

Ergonomics in design deals with:

a)

The aesthetic appeal of a product

b)

Material selection for mechanical strength

c)

Human interaction and comfort in using the product

d)

Fatigue resistance of the material

45.

Which of the following describes fatigue failure?

a)

Sudden failure under cyclic loading

b)

Slow deformation under a constant load

c)

Instantaneous fracture due to impact

d)

Gradual wear and tear of material

46.

The stress concentration factor is defined as:

a)

Ratio of ultimate tensile strength to yield strength

b)

Ratio of maximum stress at a point to the nominal stress

c)

The percentage elongation at fracture

d)

The ratio of strain to stress

47.

Which property is vital in high-temperature applications to prevent permanent deformation?

a)

Hardness

b)

Fatigue strength

c)

Creep resistance

d)

Impact toughness

48.

Which design phase focuses on understanding how the forces affect the components?

a)

Material selection

b)

Force analysis

c)

Ergonomic design

d)

Economic consideration

49.

Material selection in mechanical design should consider all the following except:

a)

Environmental impact

b)

Manufacturing processes

c)

Color and texture

d)

Mechanical properties

50.

Which factor is least relevant in ergonomic design?

a)

Comfort

b)

Material toughness

c)

Accessibility

d)

User safety

51.

Which of the following is not a ferrous material?

a)

Cast iron

b)

Mild steel

c)

Aluminium

d)

HSS

52.

A steel having minimum yield strength of 220 N / mm2 is indicated as _____

a)

Fe 220

b)

Fe Y 220

c)

Fe E 220

d)

Fe S 220

53.

In BIS designation, 40 C 15 S 12 indicates _____

a)

free cutting steel with 0.4% carbon, 1.5% manganese and 0.12% sulphur

b)

high carbon steel with 4% carbon, 1.5% manganese and 0.12% sulphur

c)

alloy steel with 0.4% carbon, 15% manganese and 0.12% sulphur

d)

tool steel with 0.4% carbon, 1.5% manganese and 12% sulphur

54.

18-4-1 HSS contains _____

a)

18% chromium, 4% tungsten and 1% vanadium

b)

18% tungsten, 4% chromium and 1% vanadium

c)

18% chromium, 4% vanadium and 1% tungsten

d)

18% tungsten, 4% vanadium and 1% chromium

55.

In BIS designation, high speed tool steel is indicated by _____

a)

HT

b)

HS

c)

XT

d)

X

56.

The ratio of maximum stress to allowable stress is known as _____.

a)

factor of safety

b)

stress factor

c)

stress ratio

d)

limit factor

57.

The property of a material by which the material is deformed slowly and progressively under a constant load over a long period is called _____.

a)

fatigue

b)

creep

c)

ductility

d)

strength

58.

The failure of the material when subjected to a number of cyclically changing loads is known as

a)

fatigue

b)

creep

c)

ductility

d)

strength

59.

In S-N curve, the scale used for the number of cycles is _____.

a)

arithmetic

b)

geometric

c)

logarithmic

d)

exponential

60.

Fatigue strength ______when temperature increases.

a)

increases

b)

decreases

c)

remains same

d)

none of the above

61.

The ratio of theoretical stress to nominal stress is called _____.

a)

factor of safety

b)

stress factor

c)

stress ratio

d)

form stress concentration factor

62.

The failure theory suitable for brittle material is _____.

a)

maximum principal stress theory

b)

maximum shear stress theory

c)

maximum distortion energy theory

d)

maximum strain theory

63.

What is the ability of a material to withstand tensile stress without failing?

a)

Compressive strength

b)

Tensile strength

c)

Shear strength

d)

Impact strength

64.

What is the ability of a material to resist deformation under stress?

a)

Ductility

b)

Brittleness

c)

Hardness

d)

Stiffness

65.

What type of material is steel?

a)

Ferrous material

b)

Non-ferrous material

c)

Ceramic material

d)

Polymer material

66.

What type of material is aluminum?

a)

Ferrous material

b)

Non-ferrous material

c)

Ceramic material

d)

Polymer material

67.

What is a common application of copper?

a)

Structural components

b)

Electrical wiring

c)

Medical implants

d)

Aerospace components

68.

What is a characteristic of composite materials?

a)

High strength-to-weight ratio

b)

Low strength-to-weight ratio

c)

High density

d)

Low durability

69.

What is fatigue failure?

a)

Failure due to excessive stress

b)

Failure due to repeated loading and unloading

c)

Failure due to corrosion

d)

Failure due to impact

70.

Which theory of failure is based on the maximum distortion energy?

a)

Principal normal stress theory

b)

Maximum shear stress theory

c)

Maximum distortion energy theory

d)

None of the above

71.

What is the primary goal of component design?

a)

To minimize cost

b)

To maximize performance

c)

To ensure safety and functionality

d)

To reduce weight

72.

What are the main categories of engineering materials?

a)

Metals, polymers, ceramics, and composites

b)

Metals, polymers, and ceramics

c)

Metals and polymers

d)

Ceramics and composites

73.

Which of the following factors affects the selection of materials?

a)

Cost

b)

Performance requirements

c)

Environmental conditions

d)

All of the above

74.

What does BIS stand for?

a)

Bureau of Indian Standards

b)

British Standards Institution

c)

Bureau of International Standards

d)

None of the above

75.

What is the purpose of preferred numbers?

a)

To reduce the number of sizes and varieties of components

b)

To increase the number of sizes and varieties of components

c)

To standardize component sizes

d)

Both A and C

76.

What is the factor of safety?

a)

The ratio of ultimate stress to allowable stress

b)

The ratio of allowable stress to ultimate stress

c)

The ratio of yield stress to ultimate stress

d)

None of the above

77.

What type of stress is caused by a force that tends to stretch or pull apart a material?

a)

Compressive stress

b)

Tensile stress

c)

Shear stress

d)

None of the above

78.

What are composite materials?

a)

Materials made from a single type of material

b)

Materials made from two or more different materials

c)

Materials that are prone to corrosion

d)

None of the above

79.

What is creep?

a)

The gradual deformation of a material under constant stress

b)

The sudden failure of a material under stress

c)

The resistance of a material to corrosion

d)

None of the above

80.

What is fatigue?

a)

The failure of a material under repeated stress

b)

The resistance of a material to corrosion

c)

The gradual deformation of a material under constant stress

d)

None of the above

81.

Which theory of elastic failure is based on the maximum normal stress?

a)

Maximum shear stress theory

b)

Maximum distortion energy theory

c)

Principal normal stress theory

d)

None of the above

82.

What is an important consideration when selecting materials for high-temperature applications?

a)

Corrosion resistance

b)

High-temperature strength

c)

Ductility

d)

All of the above

83.

What is the BIS designation for a type of steel that contains 0.25% to 0.35% carbon?

a)

Fe 250

b)

Fe 410

c)

Fe 500

d)

None of the above

84.

Which series of numbers is commonly used as preferred numbers?

a)

Renard series

b)

Geometric series

c)

Arithmetic series

d)

None of the above

85.

What is the difference between creep strain and fatigue?

a)

Creep strain occurs due to repeated loading, while fatigue occurs due to constant stress

b)

Creep strain occurs due to constant stress, while fatigue occurs due to repeated loading

c)

Creep strain occurs due to high temperature, while fatigue occurs due to low temperature

d)

None of the above

86.

What is the purpose of using a factor of safety in design?

a)

To reduce the weight of the component

b)

To increase the cost of the component

c)

To ensure the component can withstand unexpected stresses

d)

None of the above

87.

A component is subjected to a tensile stress of 100 MPa. If the material has a yield strength of 200 MPa and a factor of safety of 2, what is the allowable stress?

a)

50 MPa

b)

100 MPa

c)

150 MPa

d)

200 MPa

88.

A composite material is made from a combination of fibers and matrix. What is the primary advantage of using fibers in the composite material?

a)

Increased weight

b)

Decreased strength

c)

Improved stiffness

d)

Reduced cost

89.

Design a component that can withstand high temperatures and repeated loading. What materials would you select and why?

a)

Steel and aluminium

b)

Ceramic and composite materials

c)

Copper and brass

d)

None of the above

90.

Evaluate the suitability of a material for a specific application. What factors would you consider?

a)

Cost, performance requirements, and environmental conditions

b)

Only cost and performance requirements

c)

Only environmental conditions and material properties

d)

None of the above

91.

A rod is subjected to a tensile force of 1000 N. If the cross-sectional area of the rod is 0.01 m2, what is the tensile stress?

a)

100 kPa

b)

1000 kPa

c)

10,000 kPa

d)

100,000 kPa

92.

A shaft is subjected to a torque of 100 Nm. If the diameter of the shaft is 0.1 m, what is the torsional stress?

a)

50.93 MPa

b)

50.93 kPa

c)

509.3 MPa

d)

None of the above

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