Chemical Engineering - Chemical Engineering Basics

41. 

A material expanding freely due to heating will develop __________ stress.

A. no
B. compressive
C. tensile
D. thermal

Answer: Option A

Explanation:

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42. 

A machine having assumed life of 20 years is purchased for Rs 32000/-. Its scrap value at the end of its life is Rs 8000/-. If the depreciation is calculated by diminishing balance method, then percentage reduction in its value at the end of first year is __________ percent.

A. 6.7
B. 7.6
C. 10.3
D. 15.2

Answer: Option A

Explanation:

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43. 

More than 1000 tons refrigeration capacity plants are usually of __________ type.

A. vapour compression
B. vapour absorption
C. air refrigeration
D. none of these

Answer: Option B

Explanation:

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44. 

Pick out the wrong statement.

A. In a thin spherical shell under internal pressure, hoop stress is equal to the half of axial stress.
B. Thermoplastic material does not follow Hooke's law of elasticity.
C. Components under longitudinal compression is called 'struts' and the load under which strut fails is called crippling or buckling load.
D. At low temperatures (sub-zero) in pressure vessels, the ductility of metal diminishes and brittle fracture occurs while at high temperature in pressure vessels, embrittlement of material may take place.

Answer: Option A

Explanation:

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45. 

The increase in hardness of metal due to its cold working is termed as the __________ hardening.

A. work
B. age
C. induction
D. flame

Answer: Option C

Explanation:

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