# Multiple choice question for engineering

## Set 1

1. Flooding, frothing, entrainment are the three main phenomena limiting the tray capacity.

a) True

b) False

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2. The flow of vapor liquid in the same direction is defined as?

a) Dual flo

b) Co-flo

c) Comer flo

d) Coal flo

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3. Bubble columns, are used for?

a) Waste water treatment

b) Effluent treatment

c) Chlorine treatment

d) Sodium treatment

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4. For liquid and solid handling, that are corrosive the

a) Bubble tower is used

b) Venturi Scrubber is used

c) Spray tower is used

d) Agitated vessel are used

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5. The Venturi Scrubber operates on velocity as high as?

a) 250 ft/s

b) 100 ft/s

c) 200 ft/s

d) 150 ft/s

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6. The shells are generally made of?

a) Copper

b) Iron

c) Wood

d) Ceramics

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7. Which of the following is the oldest type of the tower packing?

a) Asbestos

b) Raschig rings

c) Wood

d) PVC

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8. The modern packing, that is most commonly used in the columns are?

a) Norton Hy-Pak

b) Flexirings

c) Berl Saddle

d) Pall ring

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9. The carbon steel has the wall thickness and void age of?

a) ½ inch and 92%

b) 1/8 inch and 74%

c) 2/3 inch and 70%

d) ¼ inch and 50%

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10. Mellapak structured packing’s have a crimp angle of?

a) 45 or 60^{o}

b) Sinusoidal

c) Sharp angle

d) 90^{o}

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^{o}whereas the Flexipak packing has an angle of 45

^{o}AND Gempak has the sinusoidal angle and Montz has a very sharp angle of crimp.

## Set 2

1. Tray efficiency correspondingly depends upon?

a) Column Diameter

b) Column throughput

c) Column length

d) Column feed

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2. When a minor fraction of liquid flows to the tray below through the tray perforations it is called

a) Weeping

b) Dumping

c) Entrainment

d) Feeding

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3. When distillate contains highest possibility of light key, D/F approaches

a) Infinity

b) Zero

c) Unity

d) Double

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4. At higher recovery _____ distillate is produced.

a) Low

b) More

c) Finite

d) Unwanted

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5. The vertical D/F line indicated the

a) Maximum impurity level

b) Minimum impurity level

c) More separation

d) Less separation

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6. The material balance optimization is also referred as

a) L V optimization

b) B D optimization

c) D B optimization

d) V L optimization

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7. Raising the column pressure, results in

a) Lower relative volatility

b) Higher relative volatility

c) No effect

d) Higher boiling point

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8. What does DCF represents?

a) Distillation Corp Factor

b) Damping Correction Factor

c) Down Comer Flow

d) Discounted Cash flow

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9. What does RVP Stands For?

a) Reid Vapor pressure

b) Reflux vapor pressure

c) Reid Viscous Parameter

d) Right Vary Parameter

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10. Energy balance optimization is a prime factor for setting

a) Operations

b) Cost

c) Reflux

d) Feed

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## Set 3

1. In matrix language, The Newton Raphson equation is

a) J_{i} Y_{if} = -F_{k}

b) J_{i} X_{if} = -F_{k}

c) J_{i} K_{if} = -F_{k}

d) J_{i} T_{if} = -F_{k}

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_{i}X

_{if}= -F

_{k},, here i represents the number of gas rows and j similarly columns of liquid.

2. What is F_{k}?

a) Vector

b) Matrix

c) Factor

d) Correction

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_{k}= (f1 f2 f3 ……fn)

^{T}, F

_{k}is Vector , Matrix and Factor are correlated by an empirical correlation of total functions and temperature.

3. A square nXn matrix is called

a) Jacobin Matrix

b) Raphson Matrix

c) Newton Matrix

d) 2N Matrix

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4. For any instance, X_{K+1} is

a) X_{k} + h

b) X_{k} + t

c) X_{k} + X

d) X_{k} + X1

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_{K+1}is X

_{k}+ h, where h is the common difference and X

_{k}is the previous calculated value of series.

5. Independent variable are in the range of

a) T_{min}< T_{j} > T_{max}

b) T_{min}> T_{j} > T_{max}

c) T_{min}< T_{j} > T_{max}

d) T_{j} < T_{max}

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_{min}< T

_{j}< T

_{max}, i.e. the maximum temperature should be less than initial and greater than the final temperature.

6. In quasi Newton Method, Sk represents the

a) Vector factor

b) Scalar factor

c) Separation factor

d) Correction factor

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7. Solve cos x = 2x?

a) 0.6780

b) 0.3456

c) 0.45018

d) 0.998

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8. Find X_{K+1}? If X_{k} = 0.5, consider a difference of 5 stages

a) 4.5

b) 5.5

c) 3.5

d) Can’t be calculated

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_{K+1}= X

_{k}+ h = 0.5+ 5 = 5.5.

9. The first assumption of the NR Method is

a) Assume K=0

b) Assume X_{i} = 0

c) Assume F(x) = 0

d) Assume F’(x) = 0

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10. Jacobin equation is solved using the

a) Matrix Multiplication

b) LU Factorization

c) Elimination Method

d) Follow up method

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## Set 4

1. Fenske’s Equation can be written as

a) N_{min} = S/ ln α

b) N_{min} = ln S/ ln α

c) N_{min} – 1 = ln S/ ln α

d) N_{min} + 1 = ln S/ ln α

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2. The term S in the Fenske’s equation, is given as

a) (x_{LK}x_{HK})D(x_{LK}x_{HK})B

b) (x_{LK}x_{HK})D(x_{LK}x_{HK})L(x_{LK}x_{HK})R

c) (x_{LK}x_{HK})L(x_{LK}x_{HK})V

d) (x_{LK}x_{HK})HK(x_{LK}x_{HK})LK

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_{LK}x

_{HK})D(x

_{LK}x

_{HK})B, representing High and Low keys of the gas and liquid phases.

3. ^{N}√α_{N} this equation is called as

a) Sorel’s Method

b) Polson Equation

c) Fenske’s Equation

d) Gilliland Equation

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4. Calculate ln S? If X_{LK}=0.41 and X_{HK} = 0.005 and X_{L}= 0.417 and X_{H}= 0.01, then

a) 9.45

b) 8.90

c) 8.137

d) 7.98

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5. A non-key component may be distributed if

a) Close to that of one key

b) The Specified separation is sloppy

c) Intermediate between keys

d) Intermediate one key

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6. In a distillation operation, the reflux ratio may vary between

a) Zero and one

b) Zero and infinity

c) Minimum and infinity

d) One and two

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_{0}/D Varies from zero to one, as the ratio cannot be more than one because that will cause the failure of the column.

7. Most distillation columns are designed for reflux ratio between

a) 3 to 5 R_{min}

b) 1.2 and 1 .7 R_{min}

c) 2 to 10 R_{min}

d) 0.2 to 0.7 R_{min}

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_{min}times reflux ratio, this also reduces the operating and the final cost of the system.

8. If Component is non-distributed, then

a) D_{R} >1

b) D_{R}<1

c) DR=0

d) DR=∞

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_{R}>1 contained entirely distillate, while if components are distributed they are entirely withdrawn.

9. If Component is distributed, then

a) 0< D_{R}> 1

b) 0< DR< 1

c) DR= 0

d) DR < 0

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_{R}< 1, D

_{R}is recovery component, if D

_{R}= 0 then there exists no distributed components in the systems.

10. Underwood’s equation can be used to find

a) Distributed components

b) Non distributed components

c) Reflux for components

d) Non reflux components

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## Set 5

1. Relaxation methods were developed for solving?

a) Co linear systems

b) Sub linear systems

c) Linear systems

d) Bilateral systems

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2. The below equation follows?

a) Change in Temperature

b) Change in Time

c) Change of T Stages

d) Change of X Stages

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3. The next trail, for the below equation is

a) K-1

b) K+1

c) K=0

d) K=x_{ij}

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_{ij,k+1}is the calculated feed stream of liquid using the initial feed conditions.

4. The below curve is called as the

a) Homologues Curve

b) Homotomy Curve

c) Euler’s Curve

d) Newton Curve

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The below equation is for question 5 and question 6.

** H(X,t)- tF(X)+(1-t)G(X) **

5. F(x) stands for

a) Simpler solution

b) Complex Solution

c) Difficult Solution

d) Simple Solution

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6. G(x) stands for

a) Simpler solution

b) Complex Solution

c) Difficult Solution

d) Simple Solution

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7. The Homotomy parameter, t travels between

a) 0 and 1

b) 0 and infinity

c) 1 and infinity

d) 1 and -1

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8. The solution is converged when

a) F(x) =0

b) G(x) =0

c) G’(x) =0

d) F’(x) =0

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9. LU decomposition is used when

a) Ax (k) = Y (k)

b) Ax (k) = bX (k)

c) Ax (k) ≠ b (k)

d) Ax (k) = b (k)

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10. The below equation is?

a) Poisons’ Equations

b) Euler’s Equation

c) Newton Equation

d) Crab Equation