Process Equipment and Plant Design MCQs

Question 1

Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the

Accepted Answer

Relative volatility is close to one (e.g., separation of close boiling isomers)

Answer

Feed is not at its bubble point

Answer

Number of equilibrium stages in only stripping section is to be calculated

Answer

Number of equilibrium stages required is likely to be very small

Question 2

Pick out the wrong statement.

Accepted Answer

A reducer is used to change the direction of a pipe in a straight run

Answer

Lug supports are less expensive than other type of supports

Answer

A pipe is differentiated from a tube by the fact that a pipe has a greater wall thickness compared to the tube

Answer

The method of fixing tubes to a tube sheet by expanding is called 'tube rolling'

Question 3

Poisson's ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson's ratio for structural and pressure vessel steel may be taken as

Accepted Answer

0.3

Answer

0.01

Answer

0.75

Answer

0.95

Question 4

Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.

Accepted Answer

Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features

Answer

Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates

Answer

Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap

Answer

Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range

Question 5

Rate of filtrate delivery is inversely proportional to the

Accepted Answer

Both A & B

Answer

Filtering area & the pressure difference driving force

Answer

Viscosity of filtrate

Answer

Cake & filter medium resistance

Question 6

Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation

Accepted Answer

Both B & C

Answer

Increases capacity

Answer

Increases economy

Answer

Does not affect the capacity

Question 7

Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

Accepted Answer

Both A & B

Answer

Practical limit reached, due to low heat transfer rate because of inadequate temperature difference

Answer

Economic limit reached, when the plant cost exceeds the saving of steam

Answer

Neither A nor B

Question 8

At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.

Accepted Answer

Lower

Answer

Higher

Answer

Same

Answer

Unpredictable

Question 9

Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have __________ roofs.

Accepted Answer

Floating

Answer

Conical

Answer

Flat

Answer

Fixed