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WorksheetsDesign of Machine Element
Total questions: 36
Worksheet time: 36mins
Name
Class
Date
1.
Stress is
a)
External force
b)
Internal resistive force
c)
Axial force
d)
Radial force
2.
A rod having L=120cm, R=1.5 cm is pulled axially by18 kN. The tensile stress produced is
a)
21.57 N/mm2
b)
23.57 N/mm2
c)
25.47 N/mm2
d)
27.47 N/mm2
3.
The property of a material by virtue of which it can be beaten or rolled into plates is called
a)
Ductility
b)
Malleability
c)
Plasticity
d)
Elasticity
4.
Which of the following reduces the stress concentration?
a)
Use of multiple notches
b)
Drilling additional holes
c)
Removal of undesired material
d)
Each of the mentioned
5.
Stress concentration is caused due to
a)
Variation in properties of material
b)
Localised Loading
c)
Abrupt change of section
d)
All of the above
6.
As per Indian standard specifications, a grey cast iron designated by ‘FG 200’ means
a)
carbon content is 2%
b)
maximum compressive strength is 200 N/mm2
c)
minimum tensile strength is 200 N/mm2
d)
maximum shear strength is 200 N/mm2
7.
Steel containing upto 0.15% carbon is known as
a)
mild steel
b)
dead mild steel
c)
medium carbon steel
d)
high carbon steel
8.
According to Indian standard specifications, a plain carbon steel designated by 40C8 means that
a)
C is 0.04 per cent and Mn is 0.08 per cent
b)
carbon content is 0.4 per cent and manganese is 0.8 per cent
c)
C content is 0.35 to 0.45 % and Mn is 0.60 to 0.90 %
d)
C content is 0.6 to 0.8 % and Mn is 0.80 to 1.20 %
9.
The material commonly used for machine tool bodies is
a)
mild steel
b)
aluminium
c)
brass
d)
cast iron
10.
Stress is
a)
External Force
b)
Force / Area
c)
Internal resistive force
d)
Axial Force
11.
The steel widely used for motor car crankshafts is
a)
nickel steel
b)
chrome steel
c)
nickel-chrome steel
d)
silicon steel
12.
Ball bearing are usually made from
a)
low carbon steel
b)
high carbon steel
c)
medium carbon steel
d)
high speed steel
13.
Hooke’s law holds good upto
a)
yield point
b)
elastic limit
c)
plastic limit
d)
breaking point
14.
The modulus of elasticity for mild steel is approximately equal to
a)
80 kN/mm2
b)
100 kN/mm2
c)
110 kN/mm2
d)
210 kN/mm2
15.
The ratio of the ultimate stress to the design stress is known as
a)
elastic limit
b)
strain
c)
factor of safety
d)
bulk modulus
16.
A localised compressive stress at the area of contact between two members is known as
a)
tensile stress
b)
bending stress
c)
bearing stress
d)
shear stress
17.
The no of basic series for preffered numbers are
a)
3
b)
5
c)
4
d)
6
18.
Endurance limit : max stress a specimen can withstand without failure for infinite cycles under
a)
Static load
b)
Dynamic load
c)
Static & Dynamic load
d)
completely reversed load
19.
In static loading, stress concentration is more serious in
a)
ductile materials
b)
brittle materials
c)
brittle as well as ductile materials
d)
elastic materials
20.
Rankine’s theory is used for
a)
brittle materials
b)
ductile materials
c)
elastic materials
d)
plastic materials
21.
The theoretical or form stress concentration factor is defined as the ratio of the
a)
Maximum Stress to Normal Stress
b)
Endurance Stress to Maximum Stress
c)
Maximum Stress to Endurance Stress
d)
Endurance Stress to Normal Stress
22.
The resistance to fatigue of a material is measured by
a)
elastic limit
b)
Young's modulus
c)
ultimate tensile strength
d)
endurance limit
23.
Factor of safety for fatigue loading is the ratio of
a)
elastic limit to the working stress
b)
Young's modulus to the ultimate tensile strength
c)
endurance limit to the working stress
d)
elastic limit to the yield point
24.
Stress concentration factor is defined as the ratio of
a)
maximum stress to the endurance limit
b)
nominal stress to the endurance limit
c)
maximum stress to the nominal stress
d)
nominal stress to the maximum stress
25.
‘Ergonomics’ is related to human
a)
Comfort
b)
Safety
c)
Both ‘a’ and ‘b’
d)
None of the above
26.
Ergonomics principle suggests that
a)
Monitoring displays be placed outside peripheral limits
b)
Glow-in-dark dials made of reflective material good 4 nights
c)
Visual be preferred over auditory systems in noisy locations
d)
All of the above
27.
Property of material by which it can be drawn to a smaller section by using tensile load is
a)
Elasticity
b)
Plasticity
c)
Ductility
d)
Malleability
28.
Which design consideration deals with appearance of the product?<br />
a)
Ergonomics
b)
Asthetics
c)
System Design
d)
Creative Design
29.
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
30.
Two parallel, equal and opposite forces acting tanget on the surface of the body is
a)
Complementary stress
b)
Compressive stress
c)
Shear stress
d)
Tensile stress
31.
Machine Designer should have / know
a)
Scientific principles & Technical information
b)
Imagination & Technical information
c)
Imagination, scientific principles, technical information
d)
Imagination & Scientific principles
32.
As per ergonomics the most frequently used components should be arranged in
a)
Left side
b)
Right side
c)
Central location
d)
Any of the above
33.
Time dependent permanent deformation is called
a)
Plastic deformation
b)
Elastic deformation
c)
Creep
d)
Inelastic deformation
34.
______ helps in establishing the interchangeability of products
a)
Specialization
b)
Standardization
c)
Simplification
d)
Diversification
35.
In a brittle material, factor of safety is
a)
Design stress/working stress
b)
Ultimate stress / allowable stress
c)
Yield stress/allowable stress
d)
Design stress/Allowable stress
36.
Stress at which material begin to deform plastically called
a)
Normal Stress
b)
Shear Stress
c)
Yield stress
d)
Safety Stress
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