# Separation Processes Questions and Answers – Dryer Models

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

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

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

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

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

Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=130F.
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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

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

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

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

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

Explanation: Since NT=ln(Tgi-Tv/Tgo-Tv), hence Tgo=156F.

Sanfoundry Global Education & Learning Series – Separation Processes.

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