MACHINE DESIGN QUIZ

The power transmitted by means of a belt depends upon

Arc of contact between the belt and the smaller pulley

Tension under which the belt is placed on the pulleys

Velocity of the belt

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

For tight leakage joints, following type of thread is best suited

Buttress

NPT (national pipe threads).

Metric

Square

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YOUR ANSWER : ?

According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by

None of these

Equating tearing resistance of the plate to the crushing resistance of the rivets

Equating tearing resistance of the plate to the shearing resistance of the rivets

Equating shearing resistance to the crushing resistance of the rivets

TRUE ANSWER : ?
YOUR ANSWER : ?

In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Becomes minimum at an optimum speed and then increases with further increase in speed

Is maximum at zero speed and decreases monotonically with increase in speed

Remains constant at all speeds

Is minimum at zero speed and increases monotonically with increase in speed

TRUE ANSWER : ?
YOUR ANSWER : ?

Brittle coating technique is used for

Experimental stress analysis

Protecting metal against corrosion

Determining brittleness

Protecting metal against wear and tear

TRUE ANSWER : ?
YOUR ANSWER : ?

The included angle for the V-belt is usually

10°-20°

60°-80°

40°-60°

30°-40°

TRUE ANSWER : ?
YOUR ANSWER : ?

In testing a material for endurance strength, it is subjected to

Completely reversed load

Impact load

Dynamic load

Static load

TRUE ANSWER : ?
YOUR ANSWER : ?

A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.

Either A or B

Fully

None of these

Partially

TRUE ANSWER : ?
YOUR ANSWER : ?

A rivet is specified by

Length of rivet

Length of tail

Type of head

Shank diameter

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following property is essential for spring materials?

Stiffness

Resilience

Ductility

Plasticity

TRUE ANSWER : ?
YOUR ANSWER : ?