Chemical Engineering - Chemical Engineering Basics

36. 

With increase in temperature, the electrical conductivity of a __________ decreases.

A. semi-conductor
B. metal or alloy
C. dielectric
D. none of these

Answer: Option A

Explanation:

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37. 

All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.

A. deuterium
B. hydrogen
C. neon
D. helium

Answer: Option B

Explanation:

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38. 

Which of the following gases cause global warming ?

A. Carbon monoxide
B. Carbon dioxide
C. Nitrogen
D. Ozone

Answer: Option B

Explanation:

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39. 

Multistage compression of air as compared to single stage compression offers the advantage of

A. power saving per unit weight of air delivered.
B. moisture elimination in the inter-stage cooler.
C. increased volumetric efficiency.
D. all (a), (b) & (c).

Answer: Option D

Explanation:

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40. 

Fine grained steels have

A. high brittleness
B. higher tendency to distort
C. high ductility
D. none of these

Answer: Option C

Explanation:

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