Online Mechanical Engineering Test - Strength of Materials Test 1

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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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The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4^th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)

[#]

The neutral axis of the cross-section a beam is that axis at which the bending stress is

zero

minimum

maximum

infinity

[#]

A body is subjected to two normal stresses 20 kN/m² (tensile) and 10 kN/m² (compressive) acting perpendicular to each other. The maximum shear stress is

5 kN/m²

10 kN/m²

15 kN/m²

20 kN/m²

[#]

The shear force at apoint on a beam is the algebraic __________ of all the forces on either side of the point.

sum

difference

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When the shear force diagram is a parabolic curve between two points, it indicates that there is a

point load at the two points

no loading between the two points

uniformly distributed load between the two points

uniformly varying load between the two points

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The polar modulus for a solid shaft of diameter (D) is

[#]

The volumetric strain is the ratio of the

original thickness to the change in thickness

change in thickness to the original thickness

original volume to the change in volume

change in volume to the original volume

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The design of thin cylindrical shells is based on

hoop stress

longitudinal stress

arithmetic mean of the hoop and the longitudinal stress

geometric mean of the hoop and longitudinal stress

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The torque transmitted by a hollow shaft of outer diameter (D) and inner diameter (d) is

[#]

10.

The strength of a riveted joint is equal to the

pull required to tear off the plate per pitch length (P_t)

pull required to shear off the rivet per pitch length (P_s)

pull required to crush the rivet per pitch length (P_c)

minimum value of P_t, P_s or P_c

[#]

11.

The maximum shear stress in a thin cylindrical shell subjected to internal pressure p is

pd/t

pd/2t

pd/4t

pd/8t

[#]

12.

The assumption, generally, made in the theory of simple bending is that

the beam material is perfectly homogenous and isotropic

the beam material is stressed within its elastic limit

the plane sections before bending remain plane after bending

all of the above

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13.

The values of equivalent length (L) and actual length (l) of a column for both ends hinged is the same

Yes

[#]

14.

The centre to centre distance, between two consecutive rivets in a row, is called

margin

pitch

back pitch

diagonal pitch

[#]

15.

In a stress-strain diagram for mild steel, as shown in the below figure, the point A represents

elastic limit

upper yield-point

lower yield point

breaking point

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16.

When a load on the free end of a cantilever beam is increased, failure will occur

at the free end

at the fixed end

in the middle of the beam

at a distance 2l/3 from free end

[#]

17.

A simply supported beam 'A' of length l, breadth b, and depth d carries a central point load W. Another beam 'B' has the same length and depth but its breadth is doubled. The deflection of beam 'B' will be __________ as compared to beam 'A'.

one-fourth

one-half

double

four times

[#]

18.

The shear modulus of most materials with respect to the modulus of elasticity is

equal to half

less than half

more than half

none of these

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19.

For a beam, as shown in the below figure, the deflection at C is (where E = Young's modulus for the beam material, and I = Moment of inertia of the beam section. )

[#]

20.

The critical neutral axis of a reinforced cement concrete beam is based on the principle that the neutral axis is situated at the centre of gravity of a given section.

True

False

[#]

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Online Mechanical Engineering Test - Strength of Materials Test 1

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