Question: Maximum permissible air velocity in pipelines is about __________ metre/second.
[A].5
10
20
40
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
No answer description available for this question.
Chemical Engineering Basics
Electrometallurgy is not involved in the extraction of __________ from its ore.
Question: Electrometallurgy is not involved in the extraction of __________ from its ore.
[A].aluminium
tin
lead
both(b) & (c)
[A].
[B].
[C].
[D].
Answer: Option D
Explanation:
No answer description available for this question.
Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when
Question: Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when
[A].cheap electricity is available.
the precious metal content of copper is high.
there is a demand for ultrapure (99.99%) electrolytic copper.
all (a), (b) & (c).
[A].
[B].
[C].
[D].
Answer: Option D
Explanation:
No answer description available for this question.
Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to
Question: Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to
[A].achieve very high purity of aluminium (99.9%).
keep the electrolyte in liquid condition by the generation of heat.
electrolytically dissociate alumina.
both(b) & (c).
[A].
[B].
[C].
[D].
Answer: Option D
Explanation:
No answer description available for this question.
Electrometallurgical methods of metal extraction is normally used for those metals
Question: Electrometallurgical methods of metal extraction is normally used for those metals
[A].whose oxide/ore is not reduced by carbon.
which fall in the category of alkali & alkaline earth metals.
which stands higher in the electrochemical series of the metal.
all (a), (b) & (c).
[A].
[B].
[C].
[D].
Answer: Option D
Explanation:
No answer description available for this question.
Galvanic corrosion
Question: Galvanic corrosion
[A].occurs in a bimetal couple.
occurs in highly stressed metallic parts only.
is exemplified by caustic embrittlement of boiler tubes.
is also called dezincification.
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
No answer description available for this question.
Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m2 of steel strip.
Question: Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m2 of steel strip.
[A].5-10
1000-1500
120-500
1500-3000
[A].
[B].
[C].
[D].
Answer: Option C
Explanation:
No answer description available for this question.
Factor of safety is the ratio of the __________ stress to the working stress.
Question: Factor of safety is the ratio of the __________ stress to the working stress.
[A].tensile
compressive
yield
bearing
[A].
[B].
[C].
[D].
Answer: Option C
Explanation:
No answer description available for this question.
Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.
Question: Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.
[A].atoms
neutrons
nucleons
electrons
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
No answer description available for this question.
An ideal material for making cooking vessels should have
Question: An ideal material for making cooking vessels should have
[A].high heat capacity.
low heat capacity.
high thermal conductivity.
both (b) and (c).
[A].
[B].
[C].
[D].
Answer: Option D
Explanation:
No answer description available for this question.