Machine Design MCQs

Question 1

For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

Accepted Answer

8

Answer

6

Answer

4

Answer

10

Question 2

The property of a bearing material which has the ability to accommodate small particles of dust, grit etc. without scoring the material of the journal, is called

Accepted Answer

Embeddability

Answer

Bondability

Answer

Comformability

Answer

Fatigue strength

Question 3

The period during which the cam follower remains at rest, when cam moves, is known as

Accepted Answer

Dwell period

Answer

Constant period

Answer

Fixed period

Answer

Idle period

Question 4

Ball bearing type screws are found in following application

Accepted Answer

Steering mechanism

Answer

Screw jack

Answer

Aeroplane engines

Answer

Crane

Question 5

According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

Accepted Answer

$$1.875 	imes \frac{\pi }{4}{{	ext{d}}^2} 	imes 	au 	imes {	ext{n}}$$

Answer

$$\frac{\pi }{4}{{	ext{d}}^2} 	imes 	au 	imes {	ext{n}}$$

Answer

$$2 	imes \frac{\pi }{4}{{	ext{d}}^2} 	imes 	au 	imes {	ext{n}}$$

Answer

$$3 	imes \frac{\pi }{4}{{	ext{d}}^2} 	imes 	au 	imes {	ext{n}}$$

Question 6

If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

Accepted Answer

0.25

Answer

0.2

Answer

0.5

Answer

0.6

Question 7

The product of the diametral pitch and circular pitch is equal to

Accepted Answer

$$\pi $$

Answer

1

Answer

$$\frac{1}{\pi }$$

Answer

$$\pi $$ × number of teeth

Question 8

According to Rankine's theory, the failure occurs at a point in a member

Accepted Answer

When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test

Answer

When the maximum shear stress in a biaxial stress system reaches the shear stress at elastic limit in a simple tension test

Answer

When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test

Answer

When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test

Question 9

Pitch point of a cam is

Accepted Answer

A point on the pitch curve having maximum pressure angle

Answer

A point on the pitch curve having minimum pressure angle

Answer

Any point on the pitch curve

Answer

Any point on the pitch circle