Machine Design MCQ Questions & Answers

1

The shear modulus of resilience is proportional to

A) Shear stress B) (Shear stress)² C) (Shear stress)³ D) (Shear stress)⁴

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Answer & Solution

Answer: Option B

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2

For a shoe brake, the equivalent coefficient of friction is equal to (where $$\mu $$ = Actual coefficient of friction and $$\theta $$ = Semi-block angle)

A) $$\frac{{2\mu \sin \theta }}{{\theta + \sin \theta }}$$ B) $$\frac{{\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$ C) $$\frac{{4\mu \sin \theta }}{{\theta + \sin \theta }}$$ D) $$\frac{{4\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$

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Answer & Solution

Answer: Option D

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3

Set screws are

A) Similar to small size tap bolts except that a greater variety of shapes of heads are available B) Slotted for a screw driver and generally used with a nut C) Used to prevent relative motion between parts D) Similar to stud

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Answer: Option C

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4

A key capable of tilting in a recess milled out in a shaft is known as

A) Woodruff key B) Feather key C) Flat saddle key D) Hollow saddle key

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Answer & Solution

Answer: Option A

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5

A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called

A) Plasticity B) Elasticity C) Ductility D) Malleability

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Answer & Solution

Answer: Option D

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6

A thin spherical shell of internal diameter d is subjected to an internal pressure p. If $${\sigma _{\text{t}}}$$ is the tensile stress for the shell material, then thickness of shell is equal to

A) $$\frac{{{\text{pd}}}}{{{\sigma _{\text{t}}}}}$$ B) $$\frac{{{\text{pd}}}}{{2{\sigma _{\text{t}}}}}$$ C) $$\frac{{{\text{pd}}}}{{3{\sigma _{\text{t}}}}}$$ D) $$\frac{{{\text{pd}}}}{{4{\sigma _{\text{t}}}}}$$

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Answer & Solution

Answer: Option D

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7

The tension on the slack side of the belt is __________ the tension on the tight side of the belt.

A) Equal to B) Less than C) Greater than D) None of these

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Answer & Solution

Answer: Option B

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8

When the belt is transmitting maximum power, the belt speed should be
(Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

A) $$\sqrt {\frac{{{\text{P}}\max }}{{2{\text{m}}}}} $$ B) $$\sqrt {\frac{{{\text{P}}\max }}{{3{\text{m}}}}} $$ C) $$\sqrt {\frac{{{\text{P}}\max }}{{\text{m}}}} $$ D) $$\sqrt {\frac{{{\text{3m}}}}{{{\text{P}}\max }}} $$

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Answer & Solution

Answer: Option B

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9

In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

A) 15 B) 17 C) 21 D) 25

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Answer & Solution

Answer: Option B

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10

Spring index is

A) Ratio of coil diameter to wire diameter B) Load required to produce unit deflection C) Its capability of storing energy D) Indication of quality of spring

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Answer & Solution

Answer: Option A

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Machine Design MCQ Questions & Answers | Mechanical Engineering