Chemical Engineering Basics MCQs

Question 1

Feed check valve is used in steam boilers to

Accepted Answer

Feed high pressure water to boiler and guard against its backflow through it

Answer

Check the water level in the boiler

Answer

Check the feed water flow rate

Answer

None of these

Question 2

Function of blow down valve in a boiler is to

Accepted Answer

Drain out the sludge from the drum

Answer

Maintain the drum level

Answer

Keep the drum pressure constant

Answer

Empty the boiler during shutdown

Question 3

Draft allowance given to patterns is for

Accepted Answer

Easy removal of pattern from the mold cavity

Answer

Compensating the liquid state shrinkage

Answer

Providing support for the core placement

Answer

Compensating the solidification shrinkage

Question 4

Potable water means the water used for

Accepted Answer

Drinking

Answer

Fire-fighting

Answer

Cooling

Answer

Evaporation to produce steam

Question 5

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg)?

Accepted Answer

B.F. gas and coke oven gas

Answer

Propane and acetylene

Answer

Propane and LPG

Answer

Sewage gas and gobar gas

Question 6

The phenomenon of weld decay is found in case of

Accepted Answer

Cast iron

Answer

Gun metal

Answer

Brass

Answer

Stainless steel

Question 7

A floating body oscillates about its __________ when it is displaced slightly.

Accepted Answer

Metacentre

Answer

Centre of gravity

Answer

Centre of buoyancy

Answer

Centre of pressure

Question 8

Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)

Accepted Answer

$$\frac{{	ext{H}}}{6}$$

Answer

$${	ext{H}}$$

Answer

$$\frac{{	ext{H}}}{2}$$

Answer

$$\frac{{	ext{H}}}{4}$$

Question 9

Expansion device used in a window air-conditioner is a/an

Accepted Answer

Capillary tube

Answer

Automatic expansion valve

Answer

Thermostatic expansion valve

Answer

Float valve