Chemical Engineering - Chemical Engineering Basics

26. 

Heat transfer by radiation from a hot body will be most rapid, if its surface is __________ because of its higher emissivity.

A. white & rough
B. black & rough
C. white & polished
D. black & polished

Answer: Option B

Explanation:

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27. 

Reduction reaction involves the

A. loss of electrons.
B. increase in oxidation number.
C. gain of electrons.
D. addition of oxygen.

Answer: Option C

Explanation:

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28. 

Specific heat of an ideal gas depends upon its

A. molecular weight
B. pressure
C. temperature
D. volume

Answer: Option C

Explanation:

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29. 

In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is

A. 1
B. 1.4
C. 1.5
D. Y = Cp/Cv

Answer: Option A

Explanation:

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30. 

A __________ type pressure sensing element is commonly used in aneroid barometer.

A. capsule
B. bellow
C. spiral tube
D. flat diaphragm

Answer: Option A

Explanation:

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