Chemical Engineering - Chemical Engineering Basics

6. 

The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.

A. equal to
B. greater than
C. less than
D. either (a), (b) or (c); depends on the size of atom

Answer: Option C

Explanation:

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7. 

__________ the exhaust gas is an indication of the incomplete combustion of fuel.

A. Low temperature of
B. High temperature of
C. High % of CO in
D. High % of CO2 in

Answer: Option C

Explanation:

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8. 

Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be

A. 9.5:1
B. 12.5:1
C. 15.5 :1
D. 18.5 : 1

Answer: Option A

Explanation:

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9. 

Frost formation on the evaporator tubes in the domestic refrigerators

A. can be prevented by proper design.
B. decreased compressor power.
C. causes heat loss due to poor heat transfer.
D. is immaterial.

Answer: Option C

Explanation:

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10. 

Function of feed check valve in a boiler is to

A. facilitate circulation of high pressure feed water.
B. check the water level in the boiler drum.
C. prevent the back flow of water.
D. regulate the water flow to boiler.

Answer: Option C

Explanation:

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