Machine Design MCQs

Question 1

The metal suitable for bearings subjected to heavy loads is

Accepted Answer

White metal

Answer

Silicon bronze

Answer

Monel metal

Answer

Phosphor bronze

Question 2

The metal suitable for bearings subjected to light loads is

Accepted Answer

Phosphor bronze

Answer

Silicon bronze

Answer

White metal

Answer

Monel metal

Question 3

The objective of caulking in a riveted joint is to make the joint

Accepted Answer

Leak-proof

Answer

Free from corrosion

Answer

Stronger in tension

Answer

Free from stress

Question 4

When an open coiled helical compression spring is subjected to an axial load (W), the compression produced in the spring will be (where, n = No. of active turns of the spring and G = Modulus of rigidity for the spring material)

Accepted Answer

$$\frac{{8{	ext{W}}{{	ext{D}}^3}{	ext{n}}}}{{{	ext{G}}{{	ext{d}}^4}}}$$

Answer

$$\frac{{2{	ext{W}}{{	ext{D}}^3}{	ext{n}}}}{{{	ext{G}}{{	ext{d}}^4}}}$$

Answer

$$\frac{{4{	ext{W}}{{	ext{D}}^3}{	ext{n}}}}{{{	ext{G}}{{	ext{d}}^4}}}$$

Answer

$$\frac{{16{	ext{W}}{{	ext{D}}^3}{	ext{n}}}}{{{	ext{G}}{{	ext{d}}^4}}}$$

Question 5

A leaf spring in automobiles is used

Accepted Answer

To absorb shocks

Answer

To apply forces

Answer

To measure forces

Answer

To store strain energy

Question 6

The fatigue stress concentration factor is defined as

Accepted Answer

The ratio of endurance limit without stress concentration to the endurance limit with stress concentration

Answer

The ratio of endurance limit with stress concentration to the endurance limit without stress concentration

Answer

The product of the endurance limits with and without stress concentration

Answer

All of the above

Question 7

If b denotes the face width and L denotes the cone distance for a bevel gear, then the bevel factor is written as

Accepted Answer

$$1 - \frac{{	ext{b}}}{{	ext{L}}}$$

Answer

$$\frac{{	ext{b}}}{{	ext{L}}}$$

Answer

$$\frac{{	ext{b}}}{{2{	ext{L}}}}$$

Answer

$$1 - 2{	ext{bL}}$$

Question 8

The ratio of the ultimate stress to the design stress is known as

Accepted Answer

Factor of safety

Answer

Elastic limit

Answer

Strain

Answer

Bulk modulus

Question 9

If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

Accepted Answer

$${\left( {\frac{{\sqrt {{{	ext{P}}_1}} + \sqrt {{{	ext{P}}_2}} }}{2}} ight)^2}$$

Answer

$${{	ext{P}}_1} + {{	ext{P}}_2}$$

Answer

$$\frac{1}{2}\left( {{{	ext{P}}_1} + {{	ext{P}}_2}} ight)$$

Answer

$$\frac{1}{2}\left( {{{	ext{P}}_1} + {{	ext{P}}_2}} ight) + {{	ext{P}}_{	ext{c}}}$$