Chemical Engineering - Chemical Engineering Basics

21. 

Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be

A. 5
B. 1.25
C. 2.5
D. 3.75

Answer: Option A

Explanation:

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22. 

Which of the following is an acidic constituent of B.F. slag ?

A. SiO2
B. FeO
C. MgO
D. CaO

Answer: Option A

Explanation:

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23. 

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is

A. 5CaO . 3 Al2O3
B. 3CaO . Al2O3
C. 3CaO . SiO2
D. 2CaO . SiO2

Answer: Option A

Explanation:

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24. 

Material of construction of the electrode used in the electric resistance welding is

A. stainless steel
B. graphite
C. copper
D. steel

Answer: Option C

Explanation:

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25. 

In practice, the compression ratio of compression-ignition (CI) engine ranges from

A. 15 to 25
B. 5 to 10
C. 40 to 55
D. 60 to 70

Answer: Option A

Explanation:

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