Chemical Engineering Basics MCQs

Question 1

In a fuel cell, chemical energy is converted into

Accepted Answer

Electrical energy directly

Answer

Mechanical energy

Answer

Electrical energy and stored therein

Answer

None of these

Question 2

Out of the following surfaces, the emis-sivity will be minimum for

Accepted Answer

Concrete

Answer

Aluminium foil

Answer

Plaster

Answer

Smooth glass

Question 3

Which set of materials is used as a moderator in nuclear reactor?

Accepted Answer

Heavy water & berrylium

Answer

Zircalloy & berrylium

Answer

Zircalloy & heavy water

Answer

Zirconium & berrylium

Question 4

Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?

Accepted Answer

E = 2G (1 + v)

Answer

E = G (1 + v)

Answer

$${	ext{E}} = \frac{{{	ext{G}}\left( {1 + {	ext{v}}} ight)}}{2}$$

Answer

E = 2G (1 + 2v)

Question 5

Dephosphorisation of molten pig iron is favoured by

Accepted Answer

Reducing and basic slag

Answer

Oxidising and basic slag

Answer

High activity co-efficient of phosphorous in metal

Answer

Oxidising and neutral slag

Question 6

Commonly used flux for brazing is

Accepted Answer

Borax

Answer

Zinc chloride

Answer

Ammonium chloride

Answer

Rosin

Question 7

For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.

Accepted Answer

500

Answer

250

Answer

1000

Answer

3000

Question 8

Air-petrol ratio in an automotive petrol engine is around

Accepted Answer

14 : 1

Answer

22 : 1

Answer

25 : 1

Answer

4 : 1

Question 9

A balanced draught boiler furnace employs __________ draught fan.

Accepted Answer

Both A & B

Answer

Induced

Answer

Forced

Answer

Neither A nor B