Machine Design MCQs

Question 1

A flange coupling is used to connect two shafts

Accepted Answer

Which are perfectly aligned

Answer

Which are not in exact alignment

Answer

Have lateral misalignment

Answer

Whose axes intersect at a small angle

Question 2

The material commonly used for crane hooks is

Accepted Answer

Wrought iron

Answer

Cast iron

Answer

Mild steel

Answer

Aluminium

Question 3

During hot working of metals,

Accepted Answer

All of the above

Answer

Porosity of the metal is largely eliminated

Answer

Grain structure of the metal is refined

Answer

Mechanical properties are improved due of refinement of grains

Question 4

Which of the following statement is correct for gears?

Accepted Answer

All of the above

Answer

The pitch circle diameter is equal to the product of module and number of teeth

Answer

The addendum is less than dedendum

Answer

The pitch circle is always greater than the base circle

Question 5

Which is correct statement?

Accepted Answer

A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel

Answer

A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

Answer

Both will be equally rigid

Answer

Which one is rigid will depend on several other factors

Question 6

A hot short metal is

Accepted Answer

Brittle when hot

Answer

Brittle when cold

Answer

Brittle under all conditions

Answer

Ductile at high temperature

Question 7

Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

Accepted Answer

F + P

Answer

F × P

Answer

P

Answer

F

Question 8

The taper on cotter varies from

Accepted Answer

1 in 48 to 1 in 24

Answer

1 in 24 to 1 in 20

Answer

1 in 15 to 1 in 10

Answer

1 in 32 to 1 in 24

Question 9

For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be

Accepted Answer

4

Answer

6

Answer

8

Answer

10