Machine Design MCQs

Question 1

The rocker arms in internal combustion engines are of __________.

Accepted Answer

First type levers

Answer

Second type levers

Answer

Third type levers

Answer

None of these

Question 2

Gears are casted by

Accepted Answer

Permanent mould casting

Answer

Sand mould casting

Answer

Slush casting

Answer

Centrifugal casting

Question 3

Basic shaft is one

Accepted Answer

Whose upper deviation is zero

Answer

Whose lower deviation is zero

Answer

Whose lower as well as upper deviations are zero

Answer

Does not exist

Question 4

Which of the following statement is wrong?

Accepted Answer

The pitch of the coil is the axial distance between adjacent coils in the compressed state

Answer

The solid length of a spring is the product of total number of coils and the diameter of the wire

Answer

The spring index is the ratio of mean diameter of the coil to the diameter of the wire

Answer

The spring stiffness is the load required per unit deflection of the spring

Question 5

Which of the following statement is wrong?

Accepted Answer

The V-belt drive is used with large center distance

Answer

The V-belt may be operated in either direction with tight side of the belt at the top or bottom

Answer

The power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts

Answer

The ratio of driving tensions in V-belt drive is more than flat belt drives

Question 6

Which of the following statement is wrong?

Accepted Answer

According to I.B.R., the thickness of butt strap shall not be less than 5 mm

Answer

The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets

Answer

The pitch of rivets should not be less than 2d, where d is the diameter of rivet hole

Answer

The maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per I.B.R., is given by Pmax = C.t + 41.28 mm

Question 7

Which of the following statement is wrong?

Accepted Answer

A key is subjected to tensile stresses

Answer

A key is used as a temporary fastening

Answer

A key is always inserted parallel to the axis of the shaft

Answer

A key prevents relative motion between the shaft and boss of the pulley

Question 8

In most machine members, the damping capacity of the material should be

Accepted Answer

High

Answer

Low

Answer

Zero

Answer

Could be anything

Question 9

Which of the following bearing is preferred for oscillating conditions?

Accepted Answer

Needle roller bearing

Answer

Double row roller bearing

Answer

Taper roller bearing

Answer

Angular contact single row ball bearing