# Multiple choice question for engineering

## Set 1

1. Brinkley Method can be used for,

i) Distillation

ii) Leaching

iii) Absorption

a) True

b) False

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2. The hi is defined as the

a) Correlating factor

b) Correction Factor

c) Striping Factor

d) Relating Factor

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3. The Smith-Brinkley (SB) method, is based on an analytical solution of the

a) Infinite-difference equations

b) Differential Equations

c) Integration

d) Finite-difference equations

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4. The Smith-Brinkley (SB) method, rates a column on basis of

a) Initial sequence of the stages

b) Reverse sequence of its stages

c) Forward sequence of its stages

d) Straight Sequence

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5. For a change in temperature ______ is added to tn.

a) Half

b) One fourth

c) Two third

d) Square

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6. Smith Brinkley method is valuable for

a) Off-line optimization

b) Reflux optimization

c) On-line optimization

d) In-line optimization

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7. If the feed temperature is 211^{o}K and Dew point is 70^{o}F, then tn is

a) 68^{o}F

b) 178^{o}F

c) 140.5^{o}F

d) 259.5^{o}F

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_{n}= (70+211)/2 = 140.5

^{o}F.

8. If the feed temperature is 2110K and Bubble point is 70^{o}F, then t_{m} is

a) 68^{o}F

b) 178^{o}F

c) 140.5^{o}F

d) 259.5^{o}F

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_{M}= (308+211)/2 = 259.5

^{o}F.

9. K_{i} are determined at the

a) Top section Temperatures

b) Bottom section Temperatures

c) Middle section Temperatures

d) Right section Temperatures

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10. K’_{I} are determined at

a) Top section Temperatures

b) Bottom section Temperatures

c) Middle section Temperatures

d) Right section Temperatures

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_{I}are determined at Bottom section Temperatures, this also involves calculation of K value for a given step response function.

## Set 2

1. Global method is also called as

a) Simultaneous regression method

b) Simultaneous rigorous method

c) Simultaneous correction method

d) Simultaneous matrix method

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2. In global Newton method, all equations are solved together in

a) Regula falsi technique

b) 2N technique

c) Newton Raphson technique

d) False technique

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3. In global Newton method, The K value is

a) Coupled

b) Decoupled

c) Extreme

d) Bi-lateral

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4. Naphtali Sandholm method uses

a) MESH

b) LVF

c) RVF

d) TEMA

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5. There are _______ equation in each stages.

a) C+1

b) 2C+2

c) 2C+1

d) None of the above

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6. There are ______ equation in whole column.

a) 2C+1

b) N (2C+1)

c) N (2C-1)

d) C-1

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7. The functions and variables are of size

a) N (2C+1) X N (2C+1)

b) N (2C+1) X N (2C-1)

c) N (2C+1) X N (2C)

d) N (2C+1) X N

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8. QC is denoted as the

a) Heat capacity

b) Heat of Condenser

c) Heat released with cooling

d) Heat Collided

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9. QR is denoted as the

a) Heat of reference

b) Heat of resemblance

c) Heat of rigorous

d) Heat of Reboiler

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10. In Naphtali Sandholm method, Absorption factor lij is denoted as

a) A_{ij}V_{ij}

b) A_{ij} / V_{ij}

c) A_{ij} + V_{ij}

d) V_{ij}

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_{ij}= A

_{ij}V

_{ij}in Naphtali Sandholm method, the multiplication of both quantities results in as matrix of i and j that can be solved easily using iterations.

## Set 3

1. Boston and Sullivan gave the concept of the

a) False method

b) Binary method

c) MESH Method

d) Inside Out Method

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2. ln S_{bj} is represented as

a) ln (K_{bj}L_{J}/V_{J})

b) ln (K_{bj}/V_{J})

c) ln( K_{bj}L_{J})

d) ln (L_{J})

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_{bj}= ln (K

_{bj}L

_{J}/V

_{J}), this also resembles the same as the stripping factor that is used in the matrix calculations.

3. The vapors side product ln R_{vj} is given as

a) ln (K_{bj}L_{J}/V_{J})

b) ln (W_{bj}L_{J}/V_{J})

c) ln (K_{bj}L_{J}/W_{J})

d) ln (W_{J})

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_{vj}= ln (W

_{j}L

_{J}/V

_{J}) is the vapors side product, L and V respectively measuring the flow rates of liquid and gas streams.

4. The liqiud side product ln RLj is given as

a) ln (K_{bj}L_{J}/V_{J})

b) ln (W_{bj}/V_{J})

c) ln (K_{bj}L_{J}/W_{J})

d) ln (W_{J}/L_{J})

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_{Lj}= ln (W

_{J}/L

_{J}) is the liquid side product, calculation of R factor for both components i and as well as j are equally important as that used in S

_{ij}.

5. For Russell method, ln Kbj is defined as

a) Aj – (Bj/Tj)

b) – (Bj/Tj)

c) Aj (Bj/Tj)

d) Aj + (Bj/Tj)

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_{bj}= A

_{j}–(B

_{j}/T

_{j}), the Russell equations resembles the same as that of the Antoine equation for detecting vapor pressure.

6. For Boston method, ln K_{bj}

a) A_{j} + B (1_{j}/T_{j} – 1/T*)

b) A_{j} – B (1_{j}/T_{j} – 1/T*)

c) A_{j} – B (1_{j}/T_{j} + 1/T*)

d) (1_{j}/T_{j} + 1/T*)

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_{bj}= A

_{j}– B (1

_{j}/T

_{j}– 1/T*), this method is a revised version of the Russell method including T* i.e. equilibrium temperature.

7. H_{J} is defined as the

a) Ideal enthalpy

b) Total enthalpy

c) Final enthalpy

d) Pure enthalpy

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_{J}is defined as the Ideal enthalpy based on liquid and gas compositions, while Hideal is defined as the ideal enthalpy.

8. H_{J} is formulated as

a) H* /ϫH_{VJ}

b) H*- ϫH_{VJ}

c) H* ( ϫH_{VJ})

d) H* + ϫH_{VJ}

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_{VJ}, here H* is equilibrium enthalpy and which is added to the difference of x with the current enthalpy.

9. Total balance material balance is given as

a) α_{ij}S_{bj}

b) α_{ij}H_{bj}

c) α_{ij}D_{bj}

d) α_{ij}V_{bj}

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_{IJ}= α

_{ij}S

_{bj},alpha is defined as the relative volatility and acts here as a correction factor.

10. The given function f(x) = x^{3}-3X^{2}+ 4 root is?

a) Negative

b) Positive

c) Unity

d) Zero

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^{3}-3X

^{2}+ 4, calculating f(0)= 4 and f(1) =2 thus it is both negative and positive as the root does not change.

## Set 4

1. The component balance of the component A is given as

a) Fz_{F}= Dx_{D} + Wx_{w}

b) Fz_{F}= Dx_{D} – Wx_{w}

c) Fz_{F}= Dx_{D}/Wx_{w}

d) Fz_{F}= Dx_{D} *Wx_{w}

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_{F}= Dx

_{D}+ Wx

_{w}, where F is the total feed.

2. If F= 200 kmol/h and Z_{F}=0.4, X_{D}=0.95, X_{W}=0.04 and R=2.0, Then D is

a) 88.1

b) 22.6

c) 79.1

d) 158.2

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_{F}= Dx

_{D}+ Wx

_{w}substituting values we get D=79.1.

3. The very First step of McCabe method is?

a) Plot the equilibrium curve

b) Plot diagonal curve

c) Plot Operating line

d) Plot stripping line

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4. Calculate Boil up? If vapor flow and bottom withdrawal are 237.3 and 120.9 respectively

a) 1.5

b) 2.9

c) 2.111

d) 1.963

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5. If ZF¬=0.58 and also feed contains 35% mole of the liquid, then intercept of y axis is

a) 0.892

b) 0.205

c) 0.707

d) Can’t be calculated

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_{F}/q-1) using values -0.58/ (0.35-1) = 0.892.

6. If Z_{F}=0.6 and also feed contains 72% mole of the liquid, then intercept of x axis is

a) 0.744

b) 0.899

c) 0.833

d) 1.2

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7. Calculate minimum reflux? If intercept is 0.56 and X_{D}= 0.96

a) 0.174

b) 0.125

c) 0.21

d) 0.28

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_{D}/ (R

_{M}+1) = 0.96/ (R

_{M}+1) M= 0.174.

8. Slope of rectifying line is given by

a) R/X_{D}

b) R/(R+1)

c) F/ (D+W)

d) R/(R+1)

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_{D}gives us the reflux to liquid ratio for the operation.

9. If x_{D}=0.95, x_{W}= 0.04 and α=2.5. Find total trays?

a) 7

b) 6.7

c) 7.7

d) 6

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_{m}+ 1 then 5.7+1 = 6.7 which is the final answer.

10. A Pinch point may occur at intersection of feed line and

a) Stream line

b) Stripping line

c) Rectifying line

d) Equilibrium line

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## Set 5

1. Separation of a volatile mixture of relatively pure products, is done in a

a) Steam distillation

b) Fractionating Column

c) Flash Distillation

d) Depending of product required

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2. McCabe Thiele is based on the assumption?

a) Constant molar overflow

b) Constant reflux ratio

c) Volatile products are used for better separation

d) Boil up ratio is infinity

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3. The vapor rich section in the distillation column is called as

a) Rectifying Section

b) Boiling section

c) Stripping Section

d) Leaching section

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4. The liquid rich section in a distillation column is called as

a) Boil up section

b) Reflux section

c) Stripping Section

d) Enriching Section

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5. The feed of a distillation column is related to be a

a) Binary mixture

b) Urinary mixture

c) Mixture of phases

d) Tertiary Mixture

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6. The equilibrium curve of the column is given as

a) yn=x

b) y*=x

c) yn+1=xn

d) xn+1=y

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7. The feed line equation is given by

a) F – L = q

b) L’ – L = qF

c) V – V’ =F

d) F = L – V

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8. The overall Energy balance of a column is given by

a) V1HV1 = L0HL0 + DHD + QC

b) QC = V1HV1

c) V1HV1 = DHD + H0

d) Can change with models

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9. If the liquid flow rate is 212 and vapor flow rate is 284, then the slope of rectifying section is?

a) 0.55

b) 0.89

c) 1.33

d) 0.75

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10. If 0.75 is the fraction of liquid in the feed, Estimate the feed line slope?

a) -2.0

b) -1.5

c) -3.0

d) Cannot be calculated