Chemical Engineering - Chemical Engineering Basics

16. 

Castability of aluminium is increased by the addition of __________ in it.

A. silicon
B. manganese
C. bismuth
D. lead

Answer: Option A

Explanation:

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17. 

Addition of __________ to steel can not impart it high strength at elevated temperature.

A. nickel
B. magnesium
C. silicon
D. manganese

Answer: Option B

Explanation:

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18. 

Hard magnetic materials have high

A. coercive force.
B. residual magnetic induction.
C. both 'a' & 'b'.
D. neither 'a' nor 'b'.

Answer: Option C

Explanation:

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19. 

The difference in the properties of a substance in three states of matter depends upon the

A. binding energy of atoms.
B. difference in molecular shape.
C. difference in intermolecular forces.
D. none of these.

Answer: Option C

Explanation:

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20. 

Ignition of fuel in a diesel engine is by

A. spark
B. hot compressed air
C. fuel injection
D. none of these

Answer: Option B

Explanation:

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