Chemical Engineering - Fertiliser Technology

46. 

Triple superphosphate is chemically represented as

A. CaF2.3Ca3(PO4)2
B. 3Ca3(PO4)2
C. Ca(PO3)2
D. Ca(H2PO4)2

Answer: Option A

Explanation:

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47. 

In ammonia synthesis (N2 + 3H2 = 2NH3), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at

A. low pressure.
B. high pressure.
C. very high temperature.
D. atmospheric pressure; as the pressure has no effect on conversion.

Answer: Option B

Explanation:

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48. 

Coal based fertiliser plants at Ramagundam (Andhra Pradesh) and Talchar (Orissa)

A. use coal for heating purpose.
B. gasify coal to get hydrogen from coal gas.
C. use coal as filler in fertiliser.
D. use coal as conditioner in fertiliser.

Answer: Option B

Explanation:

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49. 

Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done.

A. increased biuret formation
B. high corrosion rate
C. increased cost of equipment
D. all (a), (b) & (c)

Answer: Option D

Explanation:

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50. 

Which of the following gasifiers can be attached to coal based fertiliser plants ?

A. Lurgi (high pressure) gasifier.
B. Kopper-Totzek gasifier.
C. Gasifier working at 20 atm.
D. Gasifier working at 40 atm.

Answer: Option B

Explanation:

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