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Design of Machine Elements-Model Examination Nov 2020

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

The bending stress in a curved beam is,

a)

zero at the neutral axis

b)

zero at the centroidal axis

c)

zero at the inner fiber

d)

zero at the outer fiber

2.

Griffiths’ law states that fracture strength of brittle material is

a)

directly proportional to the square root of the crack length

b)

inversely proportional to the square root of the crack length

c)

directly proportional to the square of the crack length

d)

Inversely proportional to the square of the crack length

3.

Fracture mechanics is the science of

a)

predicting the influence of cracks on fatigue fracture of components

b)

predicting the influence of cracks on brittle fracture of components

c)

predicting the influence of cracks on ductile fracture of components

d)

none of the above

4.

Stress concentration factor is defined as

a)

ratio of highest stress near the discontinuity to endurance limit

b)

ratio of highest stress near the discontinuity to yield strength

c)

ratio of highest stress near the discontinuity to nominal stress obtained by elementary equation

d)

ratio of endurance limit to highest stress near the discontinuity

5.

Stress concentration occurs due to

a)

abrupt change in cross-section

b)

discontinuities in component

c)

internal cracks and flaws

d)

any one of the above

6.

In cyclic loading, the effect of stress concentration is more serious in case of

a)

components made of brittle materials

b)

components made of ductile materials

c)

components made of brittle as well as ductile materials

d)

none of the above

7.

The maximum stress concentration factor for a rectangular plate with a transverse hole loaded in tension or compression is

a)

2

b)

3

c)

2.5

d)

1

8.

stress that varies in sinusoidal manner with respect to time from a minimum value to maximum value and which has some mean as well as amplitude value is called

a)

reversed stress

b)

fluctuating stress

c)

repeated stress

d)

varying stress

9.

The surface finish factor for a highly polished component is

a)

0.89

b)

1

c)

0.85

d)

0.75

10.

The maximum bending stress in a curved beam, having symmetrical cross- section, always occurs at

a)

inner fiber

b)

outer fiber

c)

centroidal axis

d)

neutral axis

11.

The Sleeve or muff coupling is designed as a.

a)

Dun cylinder

b)

Thick cylinder

c)

Solid shaft

d)

Hollow shaft

12.

In a flange coupling the flange are coupled together by means of

a)

Bolt and nuts

b)

Studs

c)

Headless taper bolts

d)

None of these

13.

A Transmission shaft include

a)

Counter shaft

b)

Line shaft

c)

Overhead shaft

d)

All of these

14.

In designing a flange coupling the pitch circle diameter of bolts is taken as

{where d= Diameter of the Shaft}

a)

2d

b)

3d

c)

4d

d)

5d

15.

A Saddle key ___________ power through frictional resistance only.

a)

Transmits

b)

Does not transmits

c)

Either A or B

d)

None of these

16.

A Sunk key fits in the keyway of the _____________ only

a)

Hub

b)

Sleeve

c)

Both hub and sleeve

d)

Neither hub or sleeve

17.

Woodruff key permits ___________movement between shaft and the hub

a)

Axial

b)

Radial

c)

Eccentric

d)

None of these

18.

A muff coupling is connecting two shafts .The torque involved is 650N-M .The shaft diameter is 45mm with length and breadth of the key being 14mm and 80mm long Respectively.

a)

30.2N/mm2

b)

25.8N/mm2

c)

34.4N/mm2

d)

None of the listed

19.

Transmission shaft are made of

a)

Cast iron

b)

Plain carbon steel

c)

Low carbon steel

d)

Nickel chromium steel

20.

Two shaft of the same length and material are joined in series if the ratio of their diameter is 2 then the ratio of their angles of twist will be

a)

2

b)

4

c)

8

d)

16

21.

The welded edges of the plates are ______ depending upon their thickness

a)

Bended

b)

Beveled

c)

Welded

d)

Jointed

22.

The permissible stresses for standard structures are covered by ______

a)

G-Codes

b)

M-Codes

c)

National Codes

d)

Programming Codes

23.

The stress concentration factor of a Longitudinal weld is _____.

a)

2.3

b)

2.5

c)

2.7

d)

2.9

24.

What is the abbreviation of ACME?

a)

American Corps of Mechanical Engineering

b)

Advisory Committee on Medical Establishment

c)

Alliance for Continuing Medical Education

d)

Account Committee of Mechanical Equipment

25.

Buttress thread are used in______

a)

Screw Jack

b)

Vices

c)

Lead Screw

d)

Presses

26.

Which screw is used in assembly of small machines?

a)

Machine Screw

b)

Cap Screw

c)

Set Screw

d)

None

27.

Adhesives are _______ substances?

a)

Metallic

b)

Non-Metallic

c)

Physical

d)

None

28.

The region of failure is achieved by _______

a)

Molecular Bonding

b)

Atomic Bonding

c)

Physical Bonding

d)

Chemical Bonding

29.

What are types of peel test?

a)

90 degree,180 degree

b)

45 degree,90 degree

c)

180 degree,360 degree

d)

0 degree,360 degree

30.

Which factor affect the initial tension?

a)

Internal Load

b)

External Load

c)

Both d and b

d)

Initial Cost

31.

Determine number of coils in a helical compression spring , If modulus of rigidity is 80Gpa and spring stiffness is 50 N/mm. Assume wire diameter = 8mm and spring index C =5

a)

11.8 turns

b)

12.8 turns

c)

13.3 turns

d)

14.5 turns

32.

The shear stress concentration factor (Ks) in mechanical springs is given as

a)

[1+0.5/C]

b)

0.615/C

c)

[1+0.615/C]

d)

[(4C-1)/(4C+4)]+[0.615/C]

33.

Which type of springs have only active coils?

a)

Helical compression spring

b)

Helical tension spring

c)

Tension spring

d)

both (a) and (b)

34.

Why are mechanical springs used?

a)

To apply force

b)

To store energy

c)

To measure force

d)

All the above

35.

What is wahl’ s factor if spring index is 6?

a)

1.477

b)

0.955

c)

1.252

d)

1.561

36.

In which condition the axial distance between two adjacent coils is called as pitch.

a)

Compressed condition

b)

Uncompressed condition

c)

Both (a) and (b)

d)

Neither (a) nor (b)

37.

Free length of helical compression springs having square ends is

a)

Pn+2d

b)

Pn+3d

c)

2(p+d)

d)

Pn+4d

38.

Which of the following property is essential for spring materials ?

a)

Stiffness

b)

Ductility

c)

Resilience

d)

Plasticity

39.

The connecting rod bolts are tightened up so that tightening stress

a)

Is just sufficient to hold parts together

b)

Approach yield point

c)

Is 50% of yield point

d)

Is about Yield point/safety factor

40.

In leaf springs , the longest leaf is known as

a)

Master leaf

b)

lower leaf

c)

Upper leaf

d)

Middle Leaf

41.

Babbitt is used

a)

Usually to make integral bearings

b)

To not to damage the journal bearing during direct contact

c)

To collect any contaminants in the lubrication

d)

All of the above

42.

For Ovens and dryers, the following material is used to make bearings

a)

Babbitt

b)

Graphite alloy

c)

Cast iron

d)

Bronze

43.

The lubrication in which load of bearing is carried solely by a film of fluid and there is no contact between the two bearings surface is called

a)

Full film condition

b)

Boundary condition

c)

Dry condition

d)

None of the above

44.

When the load of bearing is carried by direct surface to surface contact is called

a)

Full film condition

b)

Boundary condition

c)

Dry condition

d)

None of the above

45.

Hydro static bearing usually use ____ as lubricant

a)

Oil

b)

Grease

c)

Nothing

d)

Any of the above

46.

The location of journal is measured by

a)

Attitude angle

b)

Pressure angle

c)

Wedge angle

d)

None of the above

47.

The attitude angle and eccentricity ratio are dependent on the

a)

Direction

b)

Speed of rotation

c)

The load

d)

All of the above

48.

A self-excited vibration of the journal is called

a)

Oil whirl

b)

Shaft whirl

c)

Journal whirl

d)

Bearing whirl

49.

A ________ bearing supports the load acting along the axis of the shaft

a)

Thrust

b)

Radial

c)

Longitudinal

d)

Transversal

50.

Which of the following is measure of stiffness?

a)

Modulus of elasticity

b)

Modulus of plasticity

c)

Resilience

d)

Toughness

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