# Multiple choice question for engineering

## Set 1

1. For a partial Condenser, the terms for middle diagonals are?

a) K_{If} and L_{iF}

b) -(1+L_{1}/K_{I1}D)

c) -(A_{ij})

d) A_{ij}

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_{1}/K

_{I1}D)=mi1 and A

_{ij}represents the factor of equilibrium.

2. For a partial Condenser, the terms for lower diagonals are?

a) -(1+L_{1}/K_{I1}D)

b) -(A_{ij})

c) L_{1}/K_{I1}D

d) A_{ij}

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_{1}/K

_{I1}D=A

_{i1}and L

_{1}/K

_{I1}D represents the equivalent to absorption factor.

3. For a reboiler stage N, the middle diagonal is

a) -(1+L_{1}/K_{I1}D)

b) K_{If} and L_{iF}

c) L_{1}/K_{I1}D

d) -(1+B_{1}/K_{I1}VN)

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_{1}/K

_{I1}VN), -(1+L

_{1}/K

_{I1}D) represents the next set of absorption factor of next + 1 stages.

4. For a total condenser, the reflux ratio just include

a) L_{1}/K_{I1}D

b) – (1+L_{1}/D)

c) – (1+L_{1}/K_{I1}D)

d) – (A_{ij})

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_{ij}= – (1+L

_{1}/D), Where D is the distillate of the column and L is the liquid flow rate of column.

5. In matrix form, the total material balance equations are expressed as

a) F V=-R

b) RV=-F

c) L/V=F

d) V/R = F

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6. In Thomas algorithm

a) Stage factor is calculated

b) Reflux factor is calculated

c) Feed factor is calculated

d) Boil up factor is calculated

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7. Forward elimination always starts from the

a) Right of corner

b) Middle of corner

c) Upper left corner

d) Last row

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8. Back substitution always starts from the

a) Lower right corner

b) Middle of corner

c) Upper right corner

d) Last row

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9. For Wide boiling mixtures, K value is

a) Different at different places

b) Same at different places

c) Specific at any time

d) Final Temperature based

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10. Each row acts as a

a) Different factor

b) Same factor

c) Coinciding factors

d) Elliptical Factor

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## Set 2

1. The Wang Henke equation is used, for the calculation of

a) Flow rates

b) Volatility

c) Stages

d) Reflux

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2. Wide boiling and energy coupled systems are drastically

a) Exponential

b) Linear

c) Logarithmic

d) Semi logical

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3. Difference between k and k+1 should be very

a) Small

b) Large

c) Zero

d) Unity

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4. Rigorous method are based on?

a) Heat duties

b) Product compositions

c) Feed tares

d) Stages

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5. MESH equations are written in terms of?

a) Mass rates

b) Flow rates

c) Vapor rates

d) Liquid rate

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6. In matrix form, system equation is expressed as

a) r_{i}v_{i} = -f_{j}

b) r_{i}v_{i} = -K_{j}

c) r_{i}v_{i} = -G_{j}

d) r_{i}v_{i} = -Z_{j}

### View Answer

_{i}v

_{i}= -f

_{j}, where f is the function of the matrix and r

_{i}and v

_{i}are rows and columns.

7. The transposed vapor rate vector, V_{i} is raised to power of

a) J_{k}

b) I_{k}

c) T

d) P

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_{i}= (di, vi1, vi2, vi

_{N})

^{T}So T is Power, here T represents the temperature on which the vapor rate is measured.

8. The transposed feed Rate vector, is proportional to

a) T

b) G

c) K

d) P

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_{j}= (0, 0, 0……Vi…0, 0)

^{T}So T is Power of the function and the zero represents the empty states in the function.

9. The adiabatic split of vapor and liquid portion are expressed as

a) V_{If} and L_{iF}

b) K_{If} and L_{iF}

c) V_{If} and K_{iF}

d) X_{If} and Y_{iF}

### View Answer

_{If}and L

_{If}, These are equally important for all compositions of vapor and liquid.

10. The main diagonal mij is expressed as

a) –(1+A_{ij})

b) -(A_{ij})

c) 1-A_{ij}

d) A_{ij}

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_{ij}=–(1+A

_{ij}) for any stage j, while -(A

_{ij}) represent only the factor for both gas and liquid phases and negative sign indicates the decreasing slope.

## Set 3

1. The difference between the value which has been computed and the correct value is?

a) Error

b) Shift

c) Dynamic

d) Static

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2. Inside out method apply, Stripping factor to

a) Adjust Feed

b) Adjust Final Values

c) Adjust flow rates

d) Adjust Reflux

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3. Negative flow may be removed by increasing?

a) Feed

b) Reflux

c) Trays

d) Stages

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4. A reversed temperature profile, means problem with

a) Column temperature

b) Stage temperature

c) Feed temperature

d) Plate temperature

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5. Accuracy depends upon the?

a) H value

b) S value

c) T value

d) K value

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6. A_{ij} is the?

a) Absorption factor

b) Mass transfer area

c) Activity of i and j

d) Stripping Factor

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_{ij}is the Absorption factor for component i and stage j, while “a” denotes the mass transfer area and V/L is the stripping factor.

7. C is the?

a) Heat capacity

b) Coefficient

c) Total component

d) Final component

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_{p}is called heat capacity measure in (KJ/Kg.K) C

_{p}water is 4.328.

8. For the below graph the Pinch point is at?

a) 5th stage

b) 9th stage

c) 10th stage

d) 2nd stage

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9. Bubble point is at?

a) A

b) B

c) C

d) Wrong interpretation

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10. In the same diagram, Critical point is at?

a) A

b) B

c) C

d) Wrong interpretation

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## Set 4

1. The 2N Newton method is based on algorithm of?

a) N X N

b) 2 X N

c) N X M

d) 2 X M

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2. X_{IJ} and Y_{ij} are the component balances of

a) Equilibrium relation

b) Constant relation

c) Final relation

d) Direct relation

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_{IJ}and Y

_{ij}are the component balances of Equilibrium relation, Whereas X=Y represents the final relation of the system.

3. Which method uses the summation of the equations for vapor and liquid components?

a) NR Method

b) RF Method

c) Tomich Method

d) 2N Method

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4. The independent variables of independent functions are used as, Fi =

a) [E_{1} E_{2} E_{3} …. E_{N-1} E_{N}, K_{1} K_{2} K_{3} …. K_{N-1} K_{N}].

b) [T_{1} T_{2} T_{3} …. T_{N-1} T_{N}, K_{1} K_{2} K_{3} …. K_{N-1} K_{N}].

c) [S_{1} S_{2} S_{3} …. S_{N-1} S_{N}, E_{1} E_{2} E_{3} …. E_{N-1} E_{N}].

d) [K_{1} K_{2} K_{3} …. K_{N-1} K_{N}, T_{1} T_{2} T_{3} …. T_{N-1} T_{N}].

### View Answer

_{i}= [S

_{1}S

_{2}S

_{3}…. S

_{N-1}S

_{N}, E

_{1}E

_{2}E

_{3}…. E

_{N-1}E

_{N}]

^{T}, where S is the same factor as used in Fenske’s equation and E are the respective energy of the systems.

5. The stages flow rate and the vapor flow rates are expressed, as

a) [E_{1} E_{2} E_{3} …. E_{N-1} E_{N}, V_{1} V_{2} K_{3} …. V_{N-1} V_{N}].

b) [T_{1} T_{2} T_{3} …. T_{N-1} T_{N}, V_{1} V_{2} V_{3} …. V_{N-1} V_{N}].

c) [S_{1} S_{2} S_{3} …. S_{N-1} S_{N}, E_{1} E_{2} E_{3} …. E_{N-1} E_{N}].

d) [K_{}1 K_{2} K_{3} …. K_{N-1} K_{N}, T_{1} T_{2} T_{3} …. T_{N-1} T_{N}].

### View Answer

_{i}= [T

_{1}T

_{2}T

_{3}…. T

_{N-1}T

_{N}, V

_{1}V

_{2}V

_{3}…. V

_{N-1}V

_{N}]

^{T}, where T is defined as respective temperature and the volume V corresponding to the same relation.

6. The initial assumption to Tomich method is

a) Set initial Temperature

b) Set total stages

c) Final Pressure

d) Initial Pressure

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7. The θ_{j} factor is a

a) Subtracted

b) Additive

c) Multiplier

d) Divider

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_{j}*|L

_{j}/V

_{j}|

_{CR}and θ

_{j}factor is a Multiplier, this is based on a correlation that acts as a correction factor of the calculation.

8. Newton’s method is a fixed point iteration method, As P_{n}

a) g(P_{n-1})

b) (P_{n-1})

c) g

d) P_{n}

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_{n-1}) is fixed point as in newton method, while other method NR and RS stage iterations are made as the problem proceeds.

9) Newton’s method cannot continue, if for some P_{n-1}

a) f’(P_{n+1})

b) f’(P)

c) f’(P_{n-1})

d) P

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_{n-1}), as the derivative at some point becomes zero then this is called as failure in the newton’s method.

10. Given ε>0. Then

a) f(a)f(b)>0

b) f(a)f(b)=0

c) f(a)f(b)=1

d) f(a)f(b)<0

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## Set 5

1. The following equation represents?

a) Net gain by Vapor

b) Total net gain

c) Net specific gain

d) Specific gain

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2. The following equation represents?

a) Total net gain

b) Net gain by Liquid

c) Net specific gain

d) Specific gain

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3. In the following equation, e^{v}_{j} represents?

a) Gas flux

b) Liquid flux

c) Energy

d) Equilibrium

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4. In the below equation, e^{L}_{j} represents?

a) Gas flux

b) Equilibrium

c) Energy

d) Liquid flux

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5. The below equation represents?

a) Stages Number

b) Separation efficiency

c) Purity specification

d) Specific gain

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6. When this condition satisfies

a) Mass transfer at interface should cancel

b) Mass transfer at interface should unite

c) Mass transfer at interface should maximum

d) Mass transfer at interface should minimum

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7. MERQ Stands for?

a) Material, equilibrium, regression and heat

b) Material, Energy, rate and equilibrium

c) Material, equilibrium, summation and Quality

d) Material, equilibrium, summation and heat

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8. How many trays are there per section of packing?

a) 2C+1

b) 3C+1

c) 4C+1

d) 5C+1

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9. How many trays are there in complete column?

a) N (3C+1)

b) N (2C+1)

c) N (5C+1)

d) N (6C+1)

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10. The below temperature equation, resembles

a) Stages Number

b) Separation efficiency

c) Purity specification

d) Specific gain