WorksheetsUnit 1 Engineering Materials Quiz
Total questions: 50
Worksheet time: 50mins
What is the main objective of component design in engineering?
To manufacture all components in a similar way
To ensure the component fits, functions, and lasts under load
To reduce weight regardless of performance
To use expensive materials only
Which of the following is a property of engineering materials?
Color only
Melting without change
Mechanical strength
All of the above
BIS stands for:
Bureau of Indian Standards
Bureau of International Standards
British International Standard
Bureau of Iron and Steel
Which of the following is a non-ferrous material?
Cast iron
Mild steel
Copper
Wrought iron
Non-ferrous materials do NOT contain:
Zinc
Aluminum
Iron
Copper
Which of the following is a key factor in selecting materials for a machine component?
The designer's favorite color
The availability and cost of the material
The brand name of the material
The weight of the material only
Which of the following factors affects the selection of materials in design?
Cost
Availability
Mechanical properties
All of the above
Preferred numbers in engineering design are used to:
Make random selections
Follow standard series of sizes
Choose maximum numbers
Ignore standardization
The factor of safety (FoS) for ductile materials is the ratio of:
Working stress to ultimate stress
Yield stress to working stress
Ultimate stress to yield stress
Allowable stress to yield stress
Factor of safety is used to:
Increase cost
Improve speed
Prevent failure
Improve appearance
Factor of safety is always:
Less than 1
Equal to 1
Greater than 1
Zero
What is allowable stress?
The maximum stress a material can withstand
The minimum stress required for failure
The maximum stress that is considered safe for a design
The same as ultimate stress
If the yield stress is 400 MPa and factor of safety is 2, what is the allowable stress?
100 MPa
800 MPa
200 MPa
600 MPa
Tensile stress is caused by a load that tends to _______ the body.
Compress
Bend
Elongate
Twist
A force that pushes a material apart is known as:
Compression
Shear
Tension
Torsion
Shear stress acts:
Along the length of the material
At a right angle to the surface
Tangentially to the surface
Does not act on solids
The stress that acts on a surface due to a bearing load is called:
Bending stress
Torsional stress
Bearing pressure intensity
Shear stress
Crushing failure occurs due to:
Excessive bending
Tension over the limit
Excessive compressive force on a small area
Fatigue load
In pure bending, the section subjected to maximum stress is:
Neutral axis
Top fiber
Bottom fiber
Outer most fiber
Torsional stress is induced by a _______ moment.
Bending
Twisting
Compressing
Pulling
Torsion in a circular shaft produces:
Shear stress
Normal stress
Bending stress
Crushing stress
Composite materials are:
Homogeneous
Made of two or more constituent materials
Used only in automotive industry
Single-phase materials
An example of fiber-reinforced composite is:
Steel
Concrete
Carbon fiber epoxy
Brass
Composite materials are mainly used for:
Increasing weight
Reducing strength
Enhancing properties of base materials
Corrosion
The application of composite materials is often found in:
Heavy construction
Aerospace industry
Household utensils
Low-tech applications
Creep occurs under:
Rapid loading
High impact loading
Constant load for a long time at high temperature
Low temperature
The three stages of a typical creep curve are:
Primary, Secondary, Tertiary
Initial, Peak, Decline
Elastic, Plastic, Fracture
Loading, Unloading, Failure
The third stage of the creep curve is:
Recovery
Constant strain rate
Primary deformation
Accelerated deformation
The S-N curve is used to determine the ______ of a material.
Ultimate strength
Yield strength
Endurance limit
Hardness
In an S-N curve, 'N' stands for:
Nominal stress
Number of cycles to failure
Newton
Neutral axis
What is 'fatigue' in materials?
The failure of a material under static load
The weakening of a material caused by repeatedly applied loads
The deformation of a material due to high temperature
The corrosion of a material
Fatigue failure is caused by:
Static loads
Impact loads
Repeated or fluctuating loads
High temperature
Endurance limit is the:
Maximum load before rupture
Minimum load to cause yielding
Stress below which fatigue failure will not occur
Load to cause permanent deformation
Stress concentration occurs due to:
Uniform geometry
Smooth surfaces
Notches, holes, or sharp changes in cross-section
Uniform material
Which of the following causes stress concentration?
Uniform cross-section
Sudden changes in cross-section
Smooth surface
Constant temperature
Which method is not used to reduce stress concentration?
Adding notches
Fillet radius
Material grading
Providing relief grooves
The principal stress theory assumes failure when:
Shear strain exceeds critical value
Maximum normal stress exceeds ultimate stress
Distortion energy reaches a limit
All stresses become equal
Theories of failure are used to predict:
The color change of a material
The yielding or fracture of a material under combined stresses
The cost of a component
The manufacturing process
Principal normal stress theory is also called:
Guest theory
Rankine theory
Tresca theory
Von Mises theory
Stress concentration factor (Kt) is the ratio of:
Mean stress to alternating stress
Nominal stress to maximum stress
Maximum stress to nominal stress
Strain to stress
What is the unit of stress?
N
N-m
N/m² (Pascals)
m/s²
Mild steel is also known as:
Tool steel
Low carbon steel
Alloy steel
White iron
Which steel is best suited for gears and heavy-duty shafts?
Cast iron
Stainless steel
High-carbon steel
Alloy steel (e.g. 40Cr1Mo28)
1 MPa is equal to how many N/mm²?
0.1 N/mm²
1 N/mm²
10 N/mm²
100 N/mm²
Stainless steel contains:
Carbon and lead
Copper and iron
Iron and chromium
Zinc and copper
Ductility is the property by which a material can undergo large _______ deformation.
Elastic
Plastic
Brittle
Thermal
In the BIS system, 50C4 means:
0.50% Carbon, 0.4% Chromium
0.5% Carbon, 0.4% Manganese
0.5% Carbon, 0.4% Carbon
Carbon and 4% Nickel
Which component is most likely to suffer from stress concentration?
Smooth bar
Threaded rod
Uniform beam
Homogeneous plate
Which of the following does not typically cause stress concentration?
Keyways
Fillets
Holes
Notches
Match the correct mechanical properties from the following Ductility a) Resist abrasion and scratch Malleability b) Drawn into thin wire Hardness c) Resisting the elastic and plastic deformation Toughness d) Hammered into thin sheet
1-b, 2-d, 3-a, 4-c
1-a, 2-d, 3-b, 4-c
1-b, 2-c, 3-a, 4-d
1-d, 2-b, 3-a, 4-c
