Dryer Models - Separation Processes Questions and Answers

This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Dryer Models”.

1. For a direct heat dryer,
Dry bulb temperature T_gi=250F
Wet bulb temperature is T_v=117F
What is the value of outlet temperature if N_T is 2?
a) 100
b) 120
c) 135
d) 145
View Answer

Answer: c
Explanation: Since N_T=ln(T_gi-T_v/T_go-T_v), hence T_go=135F.

2. For a direct heat dryer,
Dry bulb temperature T_gi=250F
Wet bulb temperature is T_v=150F
What is the value of outlet temperature if N_T is 2.3?
a) 100
b) 120
c) 135
d) 150
View Answer

Answer: d
Explanation: Since N_T=ln(T_gi-T_v/T_go-T_v), hence T_go=150F.

3. For a direct heat dryer,
Dry bulb temperature T_gi=250F
Wet bulb temperature is T_v=100F
What is the value of outlet temperature if N_T is 1.61?
a) 100
b) 120
c) 130
d) 145
View Answer

Answer: c
Explanation: Since N_T=ln(T_gi-T_v/T_go-T_v), hence T_go=130F.

4. For a direct heat dryer,
Dry bulb temperature T_gi=250F
Wet bulb temperature is T_v=100F
What is the value of outlet temperature if N_T is 1.32?
a) 100
b) 120
c) 133
d) 145
View Answer

Answer: c
Explanation: Since N_T=ln(T_gi-T_v/T_go-T_v), hence T_go=133F.

5. For a direct heat dryer,
Dry bulb temperature T_gi=250F
Wet bulb temperature is T_v=120F
What is the value of outlet temperature if N_T is 2.56?
a) 100
b) 130
c) 135
d) 145
View Answer

Answer: b
Explanation: Since N_T=ln(T_gi-T_v/T_go-T_v), hence T_go=130F.

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6. For a direct heat dryer,
Dry bulb temperature T_gi=250F
Wet bulb temperature is T_v=117F
What is the value of outlet temperature if N_T is 0.77?
a) 180
b) 190
c) 165
d) 145
View Answer

Answer: a
Explanation: Since N_T=ln(T_gi-T_v/T_go-T_v), hence T_go=180F.

7. For a direct heat dryer,
Dry bulb temperature T_gi=250F
Wet bulb temperature is T_v=140F
What is the value of outlet temperature if N_T is 2.39?
a) 100
b) 120
c) 135
d) 150
View Answer

Answer: d
Explanation: Since N_T=ln(T_gi-T_v/T_go-T_v), hence T_go=150F.

8. For a direct heat dryer,
Dry bulb temperature T_gi=250F
Wet bulb temperature is T_v=117F
What is the value of outlet temperature if N_T is 3.09?
a) 100
b) 120
c) 135
d) 145
View Answer

Answer: d
Explanation: Since N_T=ln(T_gi-T_v/T_go-T_v), hence T_go=145F.

9. For a direct heat dryer,
Dry bulb temperature T_gi=250F
Wet bulb temperature is T_v=117F
What is the value of outlet temperature if N_T is 1.14?
a) 175
b) 180
c) 189
d) 187
View Answer

Answer: a
Explanation: Since N_T=ln(T_gi-T_v/T_go-T_v), hence T_go=175F.

10. For a direct heat dryer,
Dry bulb temperature T_gi=250F
Wet bulb temperature is T_v=117F
What is the value of outlet temperature if N_T is 1.92?
a) 156
b) 158
c) 166
d) 189
View Answer

Answer: a
Explanation: Since N_T=ln(T_gi-T_v/T_go-T_v), hence T_go=156F.

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