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Chemical Engineering - Chemical Engineering Basics

Exercise : Chemical Engineering Basics - Section 18
21.
Which of the following metals can be extracted from its ore by both pyrometallur-gical as well as hydrometallurgical methods ?
Copper
Zinc
both 'a' & 'b'
neither 'a' nor 'b'
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
If a heat transfer surface is pock-marked with a number of cavities, then as compared to a smooth surface the heat transfer by __________ will not increase.
convection
nucleate boiling
radiation
conduction
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Piezoelectric is a material
whose properties is midway between the constituent materials.
which gets polarised, when stressed.
in which magnetising force reduces when current flowing through it is in-cresed.
which changes dimensions due to applied field.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure.
18
16
14
12
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs.
enthalpy
relative humidity
wet bulb temperature
dew point temperature
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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