MCQ on Operations of Mass Transfer

Rajasthan Polytechnic Third Year Paper 2016 – Operations of Mass Transfer

Rotary dryer can handle
(a) free flowing material
(b) dry material
(c) sticky material
(d) granular

Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried
(a) in indirect tray dryer
(b) in spray dryer
(c) by freeze drying
(d) None of these

Moisture contained by a susbstance in excess of equilibrium moisture is called
(a) Unbound moisture
(b) free moisture
(c) Critical moisture
(d) Bound moisture

Detergent solution is dried to a powder in a
(a) spray dryer
(b) tunnel dryer
(c) both (a) and (b)
(d) None of theses

Physical absorption is
(a) an irreversible phenomenon
(b) a reversible phenomenon
(c) accompanied by evolution of heat
(d) both (b)and (c)

Drying of solid involves
(a) only heat transfer
(b) only mass transfer
(c) both heat and mass transfer
(d) None of these

Absorption is a separation process of
(a) liquid gas
(b) gas-gas
(c) liquid-liquid
(d) None of these

Which of the following is a undersirable property in a tower packing?
(a) Large surface per unit volume
(b) Large free cross-section
(c) Large weight of liquid retained
(d) None of these

Very tall packed towers are divided into series of bed to
(a) reduce the overall pressure drop
(b) avoid channelling
(c) avoid flowing
(d) None of these

H.E.T.P is equal to
(a) H.T.U x N.T.U
(b) H.T.U + N.T.U
(c) H.T.U / N.T.U
(d) None of these