Chemical Engineering Mcqs

Operating velocity in a packed tower is usually __________________ the flooding velocity ?

(A) Half
(B) Twice
(C) Equal to
(D) More than

Submitted By :Ali Uppal

For stripping of a gas in a counter current stripper, the operating line _____________________?

(A) Lies above the equilibrium curve
(B) Lies below the equilibrium curve
(C) Can lie above or below the equilibrium curve
(D) Is always parallel to the equilibrium curve

Submitted By :Ali Uppal

In gas-liquid contact operation, the number of ideal stages, N = (xa – xb)/(xb – x*b). This is true when the stripping factor ‘S’ is ________________?

(A) S > 1
(B) S < 1
(C) S = 1
(D) S = ∞

Submitted By :Ali Uppal

The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?

(A) 100
(B) 10
(C) 5
(D) 1

Submitted By :Ali Uppal

Large scale usage of flash distillation is practised in __________________?

(A) Soap manufacturing
(B) Ammonia synthesis plant
(C) Polymerisation industry
(D) Petroleum refining

Submitted By :Ali Uppal

The boiling points of pure components of a binary system ________________ with increase in total pressure of the system ?

(A) Decreases
(B) Increases
(C) Remains unchanged
(D) May increase or decrease, depends on the system

Submitted By :Ali Uppal

During sensible cooling process ______________________?

(A) Relative humidity decreases
(B) Relative humidity increases
(C) Wet bulb temperature decreases
(D) Both

Submitted By :Ali Uppal

The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if___________________?

(A) NSc = 1
(B) NSc = NPr = NLe
(C) NPr = NLe
(D) NSc = NLe

Submitted By :Ali Uppal

Pick out the wrong statement ?

(A) Absorption factor is constant, when the equilibrium and operating lines are straight
(B) In case of a stripper, the equilibrium curve is always below the operating line
(C) In case of an absorber, the operating line is always above the equilibrium curve
(D) In the absorption of low solubility gases, the liquid film is the controlling resistance

Submitted By :Ali Uppal

In triangular co-ordinates, the ternary composition point falls ___________________ of the triangle?

(A) In the corners
(B) Inside
(C) On the sides
(D) None of these

Submitted By :Ali Uppal

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