Chemical Engineering - Chemical Engineering Basics

16. 

For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = - 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be

A. 30000 J
B. 60000 J
C. 90000 J
D. 240000 J

Answer: Option C

Explanation:

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17. 

Projection welding & stud welding is categorised as the __________ welding.

A. pressure
B. thermit
C. resistance
D. arc

Answer: Option C

Explanation:

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18. 

The driving force for the sintering of a powder compact is

A. strain energy.
B. surface energy.
C. volume energy.
D. stacking fault energy.

Answer: Option B

Explanation:

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19. 

The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.

A. evaporative capacity
B. evaporation efficiency
C. thermal efficiency
D. steam load

Answer: Option A

Explanation:

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20. 

Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that

A. pure oxygen has been used for combustion.
B. nitrogen percentage in the fuel is very high.
C. excess air has been used for combustion.
D. hydrogen is not present in the fuel.

Answer: Option C

Explanation:

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