PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.

Twice

2 ft irrespective of (for column > 3 ft diameter)

0.6-0.8 times

Equal to

TRUE ANSWER : ?
YOUR ANSWER : ?

Hold up of material in a operating rotary drier is in the range of

0.8 to 0.9

0.25 to 0.50

0.05 to 0.15

0.5 to 0.8

TRUE ANSWER : ?
YOUR ANSWER : ?

Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, σ = yield strength and E = modulus of elasticity)

E/σ

Σ/E

E

Σ

TRUE ANSWER : ?
YOUR ANSWER : ?

A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

Corner torus section and central dished section

Central dished section and corner torus section

Straight flange section and corner torus section

Central dished section and straight flange section

TRUE ANSWER : ?
YOUR ANSWER : ?

A perforated plate has holes of diameter dh arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by

(ph - dh . dt/2)/ph

(ph - dh)/ph

(ph - dt)/ph

(ph - dh)/dh

TRUE ANSWER : ?
YOUR ANSWER : ?

Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is __________ the longitudinal stress.

Half

Eight times

Twice

Equal to

TRUE ANSWER : ?
YOUR ANSWER : ?

For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between __________ times the tank diameter.

2.5 to 3.5

1 to 1.5

6 to 8

4 to 5

TRUE ANSWER : ?
YOUR ANSWER : ?

Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.

5

35

55

20

TRUE ANSWER : ?
YOUR ANSWER : ?

In a thin cylindrical shell, the hoop stress is __________ stress.

Radial

Longitudinal

Circumferential tensile

Compressive

TRUE ANSWER : ?
YOUR ANSWER : ?

for couplings and unions would be

350

200

60

Negligible

TRUE ANSWER : ?
YOUR ANSWER : ?

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