Chemical Engineering - Chemical Engineering Basics

36. 

Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.

A. grey
B. black
C. opaque
D. white

Answer: Option A

Explanation:

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37. 

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

A. compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller.
B. maintaining vacuum on tube side is more difficult than that on the shell side.
C. water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.
D. condenser can act as a storage unit for condensed steam.

Answer: Option C

Explanation:

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38. 

Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.

A. X-rays
B. γ-rays
C. α-rays
D. β-rays

Answer: Option B

Explanation:

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39. 

Absolute zero pressure can be attained at a temperature of

A. 0°C
B. 50°K
C. 0°R
D. none of these

Answer: Option C

Explanation:

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40. 

The product out from a cupola is called

A. wrought iron
B. pig iron
C. cast iron
D. none of these

Answer: Option C

Explanation:

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