Chemical Engineering - Chemical Engineering Basics

16. 

The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm.

A. 0.001
B. 0.01
C. 0.002
D. 0.02

Answer: Option C

Explanation:

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17. 

Steel balls are manufactured by

A. sintering
B. casting
C. cold heading
D. spinning

Answer: Option C

Explanation:

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18. 

__________ temperature remains constant during adiabatic saturation process of unsaturated air.

A. Dew point
B. Dry bulb
C. Wet bulb
D. None of these

Answer: Option C

Explanation:

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19. 

The best lubricants for a machine working at high temperature & load is

A. grease
B. solid lubricant
C. animal oils
D. mineral oils

Answer: Option B

Explanation:

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20. 

One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W . m-1 . k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is

A. 100
B. 900
C. 9000
D. 10000

Answer: Option D

Explanation:

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