This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Dryer Models”.
1. For a direct heat dryer,
Dry bulb temperature Tgi=250F
Wet bulb temperature is Tv=117F
What is the value of outlet temperature if NT is 2?
a) 100
b) 120
c) 135
d) 145
View Answer
Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=135F.
2. For a direct heat dryer,
Dry bulb temperature Tgi=250F
Wet bulb temperature is Tv=150F
What is the value of outlet temperature if NT is 2.3?
a) 100
b) 120
c) 135
d) 150
View Answer
Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=150F.
3. For a direct heat dryer,
Dry bulb temperature Tgi=250F
Wet bulb temperature is Tv=100F
What is the value of outlet temperature if NT is 1.61?
a) 100
b) 120
c) 130
d) 145
View Answer
Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=130F.
4. For a direct heat dryer,
Dry bulb temperature Tgi=250F
Wet bulb temperature is Tv=100F
What is the value of outlet temperature if NT is 1.32?
a) 100
b) 120
c) 133
d) 145
View Answer
Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=133F.
5. For a direct heat dryer,
Dry bulb temperature Tgi=250F
Wet bulb temperature is Tv=120F
What is the value of outlet temperature if NT is 2.56?
a) 100
b) 130
c) 135
d) 145
View Answer
Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=130F.
6. For a direct heat dryer,
Dry bulb temperature Tgi=250F
Wet bulb temperature is Tv=117F
What is the value of outlet temperature if NT is 0.77?
a) 180
b) 190
c) 165
d) 145
View Answer
Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=180F.
7. For a direct heat dryer,
Dry bulb temperature Tgi=250F
Wet bulb temperature is Tv=140F
What is the value of outlet temperature if NT is 2.39?
a) 100
b) 120
c) 135
d) 150
View Answer
Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=150F.
8. For a direct heat dryer,
Dry bulb temperature Tgi=250F
Wet bulb temperature is Tv=117F
What is the value of outlet temperature if NT is 3.09?
a) 100
b) 120
c) 135
d) 145
View Answer
Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=145F.
9. For a direct heat dryer,
Dry bulb temperature Tgi=250F
Wet bulb temperature is Tv=117F
What is the value of outlet temperature if NT is 1.14?
a) 175
b) 180
c) 189
d) 187
View Answer
Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=175F.
10. For a direct heat dryer,
Dry bulb temperature Tgi=250F
Wet bulb temperature is Tv=117F
What is the value of outlet temperature if NT is 1.92?
a) 156
b) 158
c) 166
d) 189
View Answer
Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=156F.
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