Online Mechanical Engineering Test - Strength of Materials Test 2

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Strain energy is the

energy stored in a body when strained within elastic limits

energy stored in a body when strained upto the breaking of a specimen

maximum strain energy which can be stored in a body

proof resilience per unit volume of a material

[#]

Resilience is the

energy stored in a body when strained within elastic limits

energy stored in a body when strained upto the breaking of the specimen

maximum strain energy which can be stored in a body

none of the above

[#]

The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.

equal to

one-half

twice

four times

[#]

When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the

top layer

bottom layer

neutral axis

every cross-section

[#]

If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is

0.20

0.30

0.50

0.60

[#]

The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called

elastic limit

yield point

ultimate point

breaking point

[#]

The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (σ_x and σ_y) acting at a body across two mutually perpendicular planes. The normal stress on an oblique section making an angle θ with the minor principle plane is given by

[#]

The bending moment in the centre of a simply supported beam carrying a uniformly distributed load of w per unit length is

zero

wl²/2

wl²/4

wl²/8

[#]

When a closely-coiled helical spring is subjected to an axial load, it is said to be under

bending

shear

torsion

crushing

[#]

10.

The unit of modulus of elasticity is same as those of

stress, strain and pressure

stress, force and modulus of rigidity

strain, force and pressure

stress, pressure and modulus of rigidity

[#]

11.

The horizontal thrust offered by the retaining wall on the retained material is (where w = Specific weight of the retained material, h = height of retaining wall, and (φ) = Angle of repose of the retained earth)

[#]

12.

The bending moment at a section tends to bend or deflect the beam and the internal stresses resist its bending. The resistance offered by the internal stresses, to the bending, is called

compressive stress

shear stress

bending stress

elastic modulus

[#]

13.

Poisson's ratio is the ratio of linear stein to the volumetric strain.

True

False

[#]

14.

The bending moment at the free end of a cantilever beam is

zero

minimum

maximum

[#]

15.

The lower layer of the beam as shown in the below figure, will be

in tension

in compression

neither in tension nor in compression

[#]

16.

For the two shafts connected in parallel and subjected to twisting moment, the angle of twist of each shaft will be same.

Yes

[#]

17.

If percentage elongation of a certain specimen made of a material 'A' under tensile test is 30% and the percentage elongation of a specimen with same dimensions made of another material 'B' is 40%, then material 'B' is more ductile than material 'A'.

Correct

Incorrect

[#]

18.

The length of a conical bar is l, diameter of base is d and weight per unit volume is w. It is fixea at its upper end and hanging freely. The elongation of the bar under the action of its own weight will be

[#]

19.

The section modulus of a circular section about an axis through its C.G., is

πd²/4

πd²/16

πd³/16

πd³/32

[#]

20.

The Rankine's constant for a mild steel column with both ends hinged is

1/750

1/1600

1/7500

1/9000

[#]

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Online Mechanical Engineering Test - Strength of Materials Test 2

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