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# Separation Processes MCQ’s – Desublimation

If the amount of sublimate per tube is m=2kg

Time to reach the maximum thickness of N is t=5h

The size of heat exchanger is S=100kg/h

Calculate the number of tubes required.

a) 100

b) 200

c) 250

d) 300

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Answer: c

Explanation: The number of tubes required N= S*t/m, hence N=250.

If the amount of sublimate per tube is m=0.4kg

Time to reach the maximum thickness of N is t=5h

The size of heat exchanger is S=100kg/h

Calculate the number of tubes required.

a) 100

b) 200

c) 250

d) 300

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Answer: b

Explanation: The number of tubes required N= S*t/m, hence N=200.

If the amount of sublimate per tube is m=1.2kg

Time to reach the maximum thickness of N is t=5h

The size of heat exchanger is S=100kg/h

Calculate the number of tubes required.

a) 100

b) 200

c) 250

d) 300

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Answer: d

Explanation: The number of tubes required N= S*t/m, hence N=300.

If the amount of sublimate per tube is m=5kg

Time to reach the maximum thickness of N is t=5h

The size of heat exchanger is S=100kg/h

Calculate the number of tubes required.

a) 100

b) 200

c) 250

d) 300

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Answer: a

Explanation: The number of tubes required N= S*t/m, hence N=100

If the amount of sublimate per tube is m=2kg

Time to reach the maximum thickness of N is t=5h

The size of heat exchanger is S=200kg/h

Calculate the number of tubes required.

a) 190

b) 560

c) 500

d) 300

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Answer: c

Explanation: The number of tubes required N= S*t/m, hence N=500.

If the amount of sublimate per tube is m=2kg

Time to reach the maximum thickness of N is t=3h

The size of heat exchanger is S=100kg/h

Calculate the number of tubes required.

a) 100

b) 150

c) 250

d) 300

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Answer: b

Explanation: The number of tubes required N= S*t/m, hence N=150.

If the amount of sublimate per tube is m=4kg

Time to reach the maximum thickness of N is t=8h

The size of heat exchanger is S=100kg/h

Calculate the number of tubes required.

a) 100

b) 200

c) 250

d) 300

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Answer: b

Explanation: The number of tubes required N= S*t/m, hence N=200.

If the amount of sublimate per tube is m=2kg

Time to reach the maximum thickness of N is t=5h

The size of heat exchanger is S=50kg/h

Calculate the number of tubes required.

a) 100

b) 150

c) 250

d) 350

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Answer: b

Explanation: The number of tubes required N= S*t/m, hence N=150.

If the amount of sublimate per tube is m=2kg

Time to reach the maximum thickness of N is t=5h

The size of heat exchanger is S=200kg/h

Calculate the number of tubes required.

a) 100

b) 900

c) 750

d) 500

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Answer: d

Explanation: The number of tubes required N= S*t/m, hence N=500.

If the amount of sublimate per tube is m=2kg

Time to reach the maximum thickness of N is t=2h

The size of heat exchanger is S=100kg/h

Calculate the number of tubes required.

a) 100

b) 200

c) 250

d) 300

**
View Answer**

Answer: a

Explanation: The number of tubes required N= S*t/m, hence N=100.