Chemical Engineering MCQs with explanations

Question 1

What is the dynamic error in a critically damped second order instrument for a ramp input (At)?

Accepted Answer

2 AT

Question 2

The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second)?

Accepted Answer

1/[L√(K/D1)]

Question 3

Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about ________ °C?

Accepted Answer

900-1000

Question 4

Fusion point of an acidic refractory material is________?

Accepted Answer

Reduced by the addition of basic oxides

Question 5

The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is________?

Accepted Answer

< 7

Question 6

Maintenance cost of a ________ pump for a particular duty is the least?

Accepted Answer

Centrifugal

Question 7

Between 230 and 370°C, blue brittleness is caused in mild steel because of the________?

Accepted Answer

Strain-ageing

Question 8

Pick out the wrong unit conversion of thermal conductivity?

Accepted Answer

1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m

Question 9

Electronic structure of a material is generally studied by________?

Accepted Answer

Spectroscopic techniques

Question 10

Hot, lumpy & abrasive materials are best transported by using a/an ________ conveyor?

Accepted Answer

Apron

Chemical Engineering MCQs with Explanations