MACHINE DESIGN QUIZ

When a belt drive is transmitting maximum power,

Driving tension on slack side is equal to centrifugal tension

Effective tension is half of centrifugal tension

Driving tension on tight side is twice the centrifugal tension

Effective tension is equal to centrifugal tension

TRUE ANSWER : ?
YOUR ANSWER : ?

In unilateral system of tolerance, the tolerance is allowed on

One side of the actual size

One side of the nominal size

Both sides of the nominal size

Both sides of the actual size

TRUE ANSWER : ?
YOUR ANSWER : ?

In a steam engine, the piston rod is usually connected to the cross-head by means of a

Cotter joint

Knuckle joint

Universal joint

Oldham coupling

TRUE ANSWER : ?
YOUR ANSWER : ?

The stress in the threaded part of the bolt will be __________ as compared to the shank.

None of these

Same

Higher

Lower

TRUE ANSWER : ?
YOUR ANSWER : ?

When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(2WD/ πd3) × K

(8WD/ πd3) × K

(4WD/ πd3) × K

(WD/ πd3) × K

TRUE ANSWER : ?
YOUR ANSWER : ?

The power transmitted by the belt drive can be increased by

Increasing the initial tension in the belt

Dressing the belt to increase the coefficient of friction

Increasing wrap angle by using idler pulley

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

6 kN/m

30 kN/m

12 kN/m

24 kN/m

TRUE ANSWER : ?
YOUR ANSWER : ?

The rated life of a bearing varies

Inversely as cube of load

Inversely as fourth power of load

Inversely as square of load

Directly as load

TRUE ANSWER : ?
YOUR ANSWER : ?

In cross or regular lay ropes

Direction of twist of wires in strands is opposite to the direction of twist of strands

Direction of twist of wires and strands are same

Wires are not twisted

Wires in two adjacent strands are twisted in opposite direction

TRUE ANSWER : ?
YOUR ANSWER : ?

A V-belt designated as B 4430 LP has

4430 mm as diameter of large pulley

4430 mm as nominal pitch length

4430 mm as centre distance between pulleys

4430 mm as diameter of small pulley

TRUE ANSWER : ?
YOUR ANSWER : ?

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