Machine Design MCQs

Question 1

A boiler plate thickness is 20 mm. The rivet diameter will be

Accepted Answer

40 mm

Answer

20 mm

Answer

10 mm

Answer

30 mm

Question 2

A thin walled cylindrical vessel consists of a central cylindrical portion having wall thickness of tc, and two hemispherical ends of wall thickness th, In order to ensure uniform stress in both the portions, ratio tc/th should be

Accepted Answer

Two

Answer

Unity

Answer

Half

Answer

Four times

Question 3

A riveted joint may fail due to

Accepted Answer

Either failure of the rivets or failure of the plates

Answer

Failure of the rivets

Answer

Failure of the plates

Answer

Failure of both rivets or plates

Question 4

Feather keys are generally

Accepted Answer

Tight in shaft and loose in hub

Answer

Loose in shaft and tight in hub

Answer

Tight in both shaft and hub

Answer

Loose in both/shaft and hub

Question 5

The distribution of stress along the length of a key fitted in shaft

Accepted Answer

Is of exponential shape, being more at the torque input end

Answer

Is uniformly constant

Answer

Varies linearly

Answer

Is of exponential shape, being less at the torque input end

Question 6

Which of the following steel key is usually strong in failure by shear and crushing

Accepted Answer

Square

Answer

Rectangular

Answer

Flat

Answer

Circular

Question 7

A saddle key

Accepted Answer

Is provided in the hub only and hollowed to fit the shaft

Answer

Has flat surface and the shaft is planned off to accommodate the key

Answer

Is fitted such that each withstands torsion in one direction only

Answer

Is designed to fit in a sunk key-way whose bed is parallel to the axis of shaft

Question 8

Shape of wood-ruff key is like

Accepted Answer

Semicircle

Answer

Cylinder

Answer

Sphere

Answer

Trapezoid

Question 9

In welded joint the throat of weld as compared to size of weld is

Accepted Answer

About 0.7 times

Answer

About same size

Answer

About 0.5 times

Answer

About 0.25 times