Chemical Engineering Basics MCQs

Question 1

The emf of a Deniell cell Zn | Zn2+ || Cu2+ | Cu can be increased by

Accepted Answer

Increasing the concentration of copper sulphate solution

Answer

Decreasing the surface area of the electrodes

Answer

Increasing the concentration of zinc sulphate solution

Answer

Increasing the surface area of the electrodes

Question 2

For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

Accepted Answer

Heat rejection is lower

Answer

Expansion & compression are isentropic

Answer

Maximum temperature is higher

Answer

Combustion is at constant volume

Question 3

In the Bayer's process, bauxite is digested under pressure using

Accepted Answer

NaOH

Answer

H2SO4

Answer

NH3

Answer

HCl

Question 4

__________ forces do not act in case of fluids.

Accepted Answer

Tensile

Answer

Vibratory

Answer

Centrifugal

Answer

Elastic

Question 5

Powder metallurgy process does not make metal powder by

Accepted Answer

Hammering

Answer

Atomisation

Answer

Grinding/milling

Answer

Electrolytic deposition

Question 6

Circulation of liquid metal (i.e. molten sodium) in a liquid metal cooled nuclear reactor is done by a/an __________ pump.

Accepted Answer

Electromagnetic

Answer

Axial flow

Answer

Diaphragm

Answer

Reciprocating

Question 7

Dies for wire drawing are generally made of

Accepted Answer

Carbides

Answer

Mild steel

Answer

Stainless steel

Answer

High carbon steel

Question 8

When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively

Accepted Answer

Decreases & increases

Answer

Increases & increases

Answer

Increases & decreases

Answer

Decreases & decreases

Question 9

Surface tension is due to the __________ forces.

Accepted Answer

Cohesive

Answer

Viscous

Answer

Adhesive

Answer

All of these