Engineering Questions with Answers - Multiple Choice Questions
Separation Processes MCQ’s- Rate-Based Methods for Packed Distillation Columns
1 - Question
What is λ= KV/L replaced by since the line for distillation is curved?
a) λ= mV/L
b) λ= MVL
c) λ= mL/V
d) λ= mV/K
View Answer
Explanation: Because the equilibrium line for distillation is curved, λ= KV/L is replaces by λ=mV/L where m is dy/dx.
2 - Question
Which of the following is correct?
a) HETP = H OG λ(λ-1)
b) HETP = H OG λ/(λ-1)
c) HETP = H OG /λ(λ-1)
d) HETP = H OG -λ(λ- 1)
View Answer
Explanation: HETP = H OG λ/(λ-1) is correct where λ= mV/L.
3 - Question
Which method uses McCabe-thiele diagram?
a) HETP method
b) HTU method
c) Ponchon-Savarit method
d) HODL method
View Answer
Explanation: The HETP method used McCabe-thiele diagram first.
4 - Question
What happens when k x >k y ?
a) Resistance to mass transfer is mainly in vapor
b) Resistance to mass transfer is mainly in liquid phase
c) Resistance to mass transfer is mainly in solid phase
d) All the resistances are equal
View Answer
Explanation: When k x >k y resistance to mass transfer is mainly in vapor.
5 - Question
What happens when k x <k y ?
a) Resistance to mass transfer is mainly in vapor
b) Resistance to mass transfer is mainly in liquid phase
c) Resistance to mass transfer is mainly in solid phase
d) All the resistances are equal
View Answer
Explanation: When k x <k y resistance to mass transfer is mainly in liquid phase.
6 - Question
In which solution are the values of HTU and HETP constant?
a) Concentrated solution
b) True solution
c) Homogeneous solution
d) Dilute solution
View Answer
Explanation: The values of HTU and HETP are constant in dilute solution.
7 - Question
What is HETP if H OG = 1.5ft and λ=01.5?
a) 1.23
b) 1.43
c) 1.65
d) 1.78
View Answer
Explanation: Since HETP = H OG λ/(λ-1), HETP = 1.5ln(1.5/(1.5-1))= 1.65.
8 - Question
What is HETP if H OG = 2.5ft and λ=01.5?
a) 1.23
b) 1.78
c) 1.26
d) 2.74
View Answer
Explanation: Since HETP = H OG λ/(λ-1), HETP = 2.5ln(1.5/(1.5-1))= 2.74.
9 - Question
What is HETP if H OG = 1.7ft and λ=1.9?
a) 1.27
b) 1.36
c) 1.89
d) 1.78
View Answer
Explanation: Since HETP = H OG λ/(λ-1), HETP = 1.7ln(1.9/(1.9-1))= 1.27
10 - Question
What is HETP if H OG = 2.6ft and λ=01.6?
a) 1.56
b) 2.1
c) 2.55
d) 1.78
View Answer
Explanation: Since HETP = H OG λ/(λ-1), HETP = 2.6ln(1.6/(1.6-1))= 2.55.