Machine Design MCQs

Question 1

Lewis equation in gears is used to find the

Accepted Answer

Compressive stress in bending

Answer

Tensile stress

Answer

Contact stress

Answer

Fatigue stress

Question 2

Involute profiles in gears are very popular because of the following advantage

Accepted Answer

All of the above

Answer

Pressure angle is constant

Answer

Face and flank of a tooth form a continuous curve

Answer

All gears having the same pitch and pressure angle work correctly together

Question 3

Gear teeth are made harder to avoid

Accepted Answer

Wear

Answer

Greater compressive stress in bending

Answer

Tensile strength

Answer

Abrasion

Question 4

Clearance in spur gears is the

Accepted Answer

Difference between the dedendum of one gear and the addendum of the mating gear

Answer

Difference between the tooth space of one gear and the tooth thickness of the mating gear measured on the pitch circle

Answer

Intentional extension of centre distance between two gears

Answer

Does not exist

Question 5

Miter gears are

Accepted Answer

Right angled bevel gears having same number of teeth

Answer

Spur gears of equal diameter and pitch

Answer

Helical gears of same module

Answer

Gears of different module

Question 6

Low pressure angle gears result in

Accepted Answer

Weaker teeth

Answer

Stronger teeth

Answer

Strength has nothing to do with pressure angle

Answer

Could be stronger or weaker depending on module adopted

Question 7

The wear on the gear teeth can be equalized (while a large and a small gear are running together) by

Accepted Answer

Making the pinion harder than the gear

Answer

Making the gear harder than the pinion

Answer

Making both gear and pinion of same hardness

Answer

Using non-metallic materials for both

Question 8

The following materials give corrosion resistance to gear sets

Accepted Answer

Non-ferrous materials

Answer

Hard materials

Answer

Hardened steel

Answer

Stainless steel

Question 9

Larger pressure angles in comparison to smaller pressure angles make the gear

Accepted Answer

Stronger

Answer

Weaker

Answer

Have no effect as regards strength

Answer

Increase wear