Machine Design MCQs

Question 1

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

Accepted Answer

Malleability

Answer

Plasticity

Answer

Elasticity

Answer

Ductility

Question 2

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

Accepted Answer

$$\frac{{{	ext{pd}}}}{{4{\sigma _{	ext{t}}}}}$$

Answer

$$\frac{{{	ext{pd}}}}{{{\sigma _{	ext{t}}}}}$$

Answer

$$\frac{{{	ext{pd}}}}{{2{\sigma _{	ext{t}}}}}$$

Answer

$$\frac{{{	ext{pd}}}}{{3{\sigma _{	ext{t}}}}}$$

Question 3

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

Accepted Answer

Less than

Answer

Equal to

Answer

Greater than

Answer

None of these

Question 4

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))

Accepted Answer

$$\sqrt {\frac{{{	ext{P}}\max }}{{3{	ext{m}}}}} $$

Answer

$$\sqrt {\frac{{{	ext{P}}\max }}{{2{	ext{m}}}}} $$

Answer

$$\sqrt {\frac{{{	ext{P}}\max }}{{	ext{m}}}} $$

Answer

$$\sqrt {\frac{{{	ext{3m}}}}{{{	ext{P}}\max }}} $$

Question 5

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

Accepted Answer

17

Answer

15

Answer

21

Answer

25

Question 6

Spring index is

Accepted Answer

Ratio of coil diameter to wire diameter

Answer

Load required to produce unit deflection

Answer

Its capability of storing energy

Answer

Indication of quality of spring

Question 7

A spring is used to

Accepted Answer

All of these

Answer

Measure forces

Answer

Apply forces

Answer

Store energy

Question 8

Which of the following property is essential for spring materials?

Accepted Answer

Resilience

Answer

Stiffness

Answer

Ductility

Answer

Plasticity

Question 9

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

Accepted Answer

Maximum at the inner surface and minimum at the outer surface

Answer

Maximum at the outer surface and minimum at the inner surface

Answer

Maximum at the inner surface and zero at the outer surface

Answer

Maximum at the outer surface and zero at the inner surface