Machine Design MCQs

Question 1

Rivets are generally specified by

Accepted Answer

Nominal diameter

Answer

Thickness of plates to be riveted

Answer

Length of rivet

Answer

Diameter of head

Question 2

The size of a gear is usually specified by

Accepted Answer

Pitch circle diameter

Answer

Pressure angle

Answer

Circular pitch

Answer

Diametral pitch

Question 3

An alien bolt is

Accepted Answer

Provided with hexagonal depression in head

Answer

Self locking bolt

Answer

Same as stud

Answer

Used in high speed components

Question 4

The fatigue life of a part can be improved by

Accepted Answer

Shot peening

Answer

Electroplating

Answer

Polishing

Answer

Coating

Question 5

Which of the following property is desirable in parts subjected to shock and impact loads?

Accepted Answer

Toughness

Answer

Strength

Answer

Stiffness

Answer

Brittleness

Question 6

The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T1 and T2 = Tensions on the tight and slack sides of belt respectively, $$\mu $$ = Coefficient of friction, between the belt and pulley and $$	heta $$ = Angle of contact)

Accepted Answer

$$\frac{{{{	ext{T}}_1}}}{{{{	ext{T}}_2}}} = {	ext{e}}\mu 	heta $$

Answer

$$\frac{{{{	ext{T}}_1}}}{{{{	ext{T}}_2}}} = \mu 	heta $$

Answer

$$\log \frac{{{{	ext{T}}_1}}}{{{{	ext{T}}_2}}} = \mu 	heta $$

Answer

$$\frac{{{{	ext{T}}_1}}}{{{{	ext{T}}_2}}} = \log \mu 	heta $$

Question 7

A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

Accepted Answer

15 N-m

Answer

5 N-m

Answer

7 N-m

Answer

10 N-m

Question 8

A steel containing up to 0.15% carbon is known as

Accepted Answer

Dead mild steel

Answer

Mild steel

Answer

Medium carbon steel

Answer

High carbon steel

Question 9

A steel containing 0.8% carbon is known as

Accepted Answer

Eutectoid steel

Answer

Hypereutectoid steel

Answer

Hypo-eutectoid steel

Answer

None of these