Chemical Engineering - Chemical Engineering Basics

6. 

Upto the critical radius of insulation, added insulation, will

A. increase the heat loss.
B. decrease heat loss and will have no effect beyond that.
C. decrease heat flux.
D. reduce convection heat loss compared to conduction heat less.

Answer: Option B

Explanation:

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7. 

Limestone is added in the blast furnace (during pig iron manufacture) to

A. form slag by combining with impurities.
B. supply heat by undergoing exothermic reaction with impurities.
C. reduce the coke consumption.
D. reduce slag viscosity.

Answer: Option A

Explanation:

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8. 

Cementite is in the lamellar form in the __________ phase of steel.

A. martensitic
B. bainitic
C. pearlitic
D. ferritic

Answer: Option C

Explanation:

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9. 

To improve the machinability of steel, it is generally subjected to

A. spherodising
B. tempering
C. normalising
D. annealing

Answer: Option A

Explanation:

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10. 

Silicon in steel

A. makes it usable in almost all magnetic circuits where alternating current is used.
B. increases its electrical resistivity and decreases the hysteresis loss.
C. is present upto 5% & 4% respectively when used in transformers & motor armatures.
D. all 'a', 'b' & 'c'.

Answer: Option D

Explanation:

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