Machine Design I R12

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According to Indian standard specifications, a plain carbon steel designated by 40C8 means that

carbon content is 0.04 per cent and manganese is 0.08 per cent

carbon content is 0.4 per cent and manganese is 0.8 per cent

carbon content is 0.35 to 0.45 per cent and manganese is 0.60 to 0.90 per cent

carbon content is 0.60 to 0.80 per cent and manganese is 0.8 to 1.2 per cent

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The material commonly used for crane hooks is

cast iron

wrought iron

mild steel

Aluminium

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A localised compressive stress at the area of contact between two members is known as

tensile stress

bending stress

bearing stress

shear stress

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Which of the following material has the maximum ductility?

Mild steel

Copper

Zinc

Aluminium

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The neutral axis of a beam is subjected to

zero stress

maximum tensile stress

maximum compressive stress

maximum shear stress

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The bending stress in a curved beam is

zero at the centroidal axis

zero at the point other than centroidal axis

maximum at the neutral axis

maximum at the centroidal axis

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In case of thick cylinders, the tangential stress across the thickness of cylinder is

maximum at the outer surface and minimum at the inner surface

maximum at the inner surface and minimum at the outer surface

maximum at the inner surface and zero at the outer surface

maximum at the outer surface and zero at the inner surface

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The longitudinal stress is ...... of the circumferential stress.

one-half

two-third

three-fourth

one fourth

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While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

both ends fixed

both ends hinged

one end fixed and other end hinged

one end fixed and other end free.

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Which of the following screw thread is adopted for power transmission in either direction?

Acme threads

Square threads

Buttress threads

Multiple threads

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The eye bolts are used for

transmission of power

locking devices

lifting and transporting heavy machines

absorbing shocks and vibrations

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In a steam engine, the piston rod is usually connected to the crosshead by means of a

knuckle joint

universal joint

flange coupling

cotter joint

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A cotter joint is used to transmit

axial tensile load only

axial compressive load only

combined axial and twisting loads

axial tensile or compressive loads

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The residential compressive stress by way of surface treatment of a machine member subjected to fatigue loading

improves the fatigue life

deteriorates the fatigue life

does not affect the fatigue life

immediately fractures the specimen

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Stress concentration factor is defined as the ratio of

maximum stress to the endurance limit

nominal stress to the endurance limit

maximum stress to the nominal stress

nominal stress to the maximum stress

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The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to

static load

dynamic load

static as well as dynamic load

completely reversed load

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The resistance to fatigue of a material is measured by

elastic limit

Young's modulus

ultimate tensile strength

endurance limit

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The sleeve or muff coupling is designed as a

thin cylinder

thick cylinder

solid shaft

hollow shaft

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The maximum shear stress theory is used for

brittle materials

ductile materials

plastic materials

non-ferrous materials

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A key made from a cylindrical disc having segmental cross-section, is known as

feather key

gib head key

woodruff key

flat saddle key

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The type of stresses developed in the key is/are

shear stress alone

bearing stress alone

both shear and bearing stresses

shearing, bearing and bending stresses

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When helical compression spring is cut into halves, the stiffness of the resulting spring will be

Same

Double

one-half

one-fourth

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A leaf spring in automobiles is used

to apply forces

to measure forces

to absorb shocks

to store strain energy

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The maximum energy that can be stored in a body due to external loading upto the elastic limit is called

Resilience

proof resilience

strain energy

modulus of resilience

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When a helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

tensile stress

compressive stress

shear stress

bending stress

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