Chemical Engineering - Chemical Engineering Basics

36. 

Scaling occurs in boiler tubes due to the fact that, the solubility of Ca(OH)2 __________ with increasing temperature.

A. increases
B. decreases
C. shows inversion of solubility
D. none of these

Answer: Option A

Explanation:

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37. 

While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to __________ x Tm (where, Tm Melting temperature).

A. 0.25
B. 0.45
C. 0.70
D. 0.95

Answer: Option C

Explanation:

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38. 

The factor of safety for brittle materials (having elongation < 5%) is based on the __________ stress.

A. yield
B. proof
C. ultimate
D. none of these

Answer: Option C

Explanation:

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39. 

Carburettor in a spark ignition engine is used to

A. mix air-fuel in the desired ratio.
B. maintain a constant speed at varying loads.
C. adjust the stroke length.
D. increase the compression ratio.

Answer: Option A

Explanation:

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40. 

__________ are not emitted by radioactive substances.

A. α-rays
B. β-rays
C. protons
D. positrons

Answer: Option C

Explanation:

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