Machine Design MCQs

Question 1

In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

Accepted Answer

Four times

Answer

Equal to

Answer

Twice

Answer

Three times

Question 2

The connecting rod bolts are tightened up so that tightening stress

Accepted Answer

Approaches yield point

Answer

Is just sufficient to hold parts together

Answer

Is 50% of yield point

Answer

Is about yield point divided by safety factor

Question 3

The property of a bearing material which has the ability to accommodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as

Accepted Answer

Comformability

Answer

Bondability

Answer

Embeddability

Answer

Fatigue strength

Question 4

Antifriction bearings are

Accepted Answer

None of the above

Answer

Sleeve bearings

Answer

Hydrodynamic bearings

Answer

Thin lubricated bearings

Question 5

The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

Accepted Answer

$$\frac{{{{	ext{K}}_{	ext{f}}} - 1}}{{{{	ext{K}}_{	ext{t}}} - 1}}$$

Answer

$$\frac{{{{	ext{K}}_{	ext{f}}} + 1}}{{{{	ext{K}}_{	ext{t}}} + 1}}$$

Answer

$$\frac{{{{	ext{K}}_{	ext{t}}} + 1}}{{{{	ext{K}}_{	ext{f}}} + 1}}$$

Answer

$$\frac{{{{	ext{K}}_{	ext{t}}} - 1}}{{{{	ext{K}}_{	ext{f}}} - 1}}$$

Question 6

Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

Accepted Answer

Tangent key

Answer

Woodruff key

Answer

Feather key

Answer

Gib-head key

Question 7

The cold working of metals is carried out __________ the recrystallization temperature.

Accepted Answer

Below

Answer

Above

Answer

At

Answer

None of these

Question 8

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

Accepted Answer

Woodruff key

Answer

Feather key

Answer

Flat saddle key

Answer

Gib head key

Question 9

The included angle in unified of American National threads is

Accepted Answer

60°

Answer

55°

Answer

47°

Answer

29°