Engineering :: Mass Transfer

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81.

If q is interpreted to be the fraction of the feed stream that is liquid then for saturated liquid feed to a distillation column

A.	q = 0	B.	q < 0
C.	q > 1	D.	q = 1

82.

If the feed to a distillation column is a saturated liquid then the slope of the feed line is

A.	0	B.	?
C.	> 1	D.	< 1

83.

The slope of operating line in the rectifying section of a distillation column is unity if the reflux ratio is where Rmin = minimum reflux ration

A.	0	B.	1
C.	?	D.	Rmin

84.

In a distillation operation the heat removed in condenser

A.	remains unaffected with change in reflux ratio	B.	increases with increase in reflux ration
C.	decreases with increase in reflux ration	D.	and the heat required in reboiler decrease with increase in reflux ratio

85.

In a distillation operation the reflux ratio may vary between

A.	zero and one	B.	zero and infinity
C.	minimum and infinity	D.	one and two

86.

In a distillation operation total reflux requires

A.	minimum number of plates	B.	infinite number of plates
C.	minimum reboiler and condenser load	D.	that the flow of fresh feed must continue

87.

Most distillation columns are designed for reflux ratios between where Rmin = minimum reflux ratio

A.	3 to 5 times Rmin	B.	1.2 to 1.7 times Rmin
C.	2 to 10 times Rmin	D.	0.2 to 0.7 times Rmin

88.

At minimum reflux ratio the fixed cost of a distillation column is

A.	minimum number of plates	B.	infinite
C.	optimum

89.

At minimum reflux ratio the operating cost of a distillation column is

A.	maximum possible	B.	optimum
C.	minimum	D.	infinite

90.

At total reflux the capacity of a distillation colum is

A.	zero and one	B.	maximum
C.	minimum	D.	optimum