MACHINE DESIGN QUIZ

When a close coiled helical spring is compressed, its wire is subjected to

All of these

Compression

Shear

Tension

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of driving tensions in V-belt drives is __________ flat belt drives.

sin α times more than

sin α times less than

cosec α times more than

Equal to

TRUE ANSWER : ?
YOUR ANSWER : ?

A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.

Less than

None of these

Greater than

Equal to

TRUE ANSWER : ?
YOUR ANSWER : ?

A tube has the following advantage over pipe

Smoother inside walls

Greater shock absorption

All of these

Lighter and easier to handle

TRUE ANSWER : ?
YOUR ANSWER : ?

The rolling contact bearings as compared to sliding contact bearings have

All of these

Small overall dimensions

Accuracy of shaft alignment

Low starting and low running friction except at very high speeds

TRUE ANSWER : ?
YOUR ANSWER : ?

The railway carriage couplings have

Buttress threads

Acme threads

Square threads

Knuckle threads

TRUE ANSWER : ?
YOUR ANSWER : ?

If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Decreases

None of these

Remains unchanged

Increases

TRUE ANSWER : ?
YOUR ANSWER : ?

The shear stress in a beam varies from zero at the outer fibers to a maximum at the________.

Lower surface

Upper surface

Neutral surface

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Lewis equation is applied

To stronger of the pinion or gear

Only to the pinion

Only to the gear

To weaker of the pinion or gear

TRUE ANSWER : ?
YOUR ANSWER : ?

The permissible stress in the fillet weld is 100 N/mm². The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is

22.5 kN

7.5 kN

15 kN

10.6 kN

TRUE ANSWER : ?
YOUR ANSWER : ?

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