MACHINE DESIGN QUIZ

According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

63 to 70%

70 to 83%

45 to 60%

80 to 90%

TRUE ANSWER : ?
YOUR ANSWER : ?

The rolling contact bearings as compared to sliding contact bearings have

Accuracy of shaft alignment

All of these

Small overall dimensions

Low starting and low running friction except at very high speeds

TRUE ANSWER : ?
YOUR ANSWER : ?

For circumferential joint in boilers, the type of joint used is

Any one of the above

Butt joint with single cover plate

Lap joint with one ring overlapping the other

Butt joint with double cover plate

TRUE ANSWER : ?
YOUR ANSWER : ?

Three different weights fall from a certain height under vacuum. They will take

Same time to reach earth

Times inversely proportional to weight to reach earth

None of these

Times proportional to weight to reach earth

TRUE ANSWER : ?
YOUR ANSWER : ?

The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

Elasticity

Malleability

Ductility

Plasticity

TRUE ANSWER : ?
YOUR ANSWER : ?

A shaft is subjected to

Combined bending and shear stresses

Shear stresses

Bending stresses

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The stress induced in the belt is,

Direct shear stress

Torsional shear stress

Compressive stress

Tensile stress

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given by Where m = mass of belt per meter (kg/m) v = belt velocity (m/s) f = coefficient of friction a = angle of wrap (radians)

P1 / P2 = eᶠα

(P1 - mv²)/ (P2 - mv²) = eᶠα

P1 / P2 = e–ᶠα

(P1 - mv²)/ (P2 - mv²) = e–ᶠα

TRUE ANSWER : ?
YOUR ANSWER : ?

The cross-section of the arm of a bell crank lever is

I-section

Any one of these

Elliptical

Rectangular

TRUE ANSWER : ?
YOUR ANSWER : ?

Applications in which stresses are encountered in one direction only uses following type of threads

Square

Metric

Acme

Buttress

TRUE ANSWER : ?
YOUR ANSWER : ?

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