Chemical Engineering - Chemical Engineering Basics

1. 

Titanium is added to molten aluminium alloys before casting for the purpose of

A. grain refinement.
B. increasing corrosion resistance.
C. reducing porosity.
D. improving fluidity.

Answer: Option D

Explanation:

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2. 

Cemented carbide tools are not suitable for cutting

A. aluminium
B. brass
C. cast iron
D. steel

Answer: Option A

Explanation:

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3. 

The difference between gross & net calorific values of fuel is due to the

A. sensible heat carried away by the flue gases.
B. heat carried away by the steam from the moisture content of the fuel.
C. heat lost by radiation.
D. heat carried away by steam from the combustion of hydrogen in the fuel.

Answer: Option D

Explanation:

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4. 

Which of the following is preferred for rivetting ?

A. Lap joint
B. Butt joint
C. Either (a) or (b)
D. Neither (a) nor (b)

Answer: Option B

Explanation:

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5. 

Heating the hypoeutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called

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

Answer: Option C

Explanation:

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