# Multiple choice question for engineering

## Set 1

1. Feed should be located at?

a) Far from optimum

b) Below the optimum

c) Away from optimum

d) At optimum

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2. Reflux ratio should be?

a) Minimum

b) Maximum

c) Optimum

d) Can’t specified

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3. Boil Up ratio should be?

a) Minimum

b) Maximum

c) Optimum

d) Can’t specified

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4. Sneaking up is a

a) Homologues Method

b) Homotomy Method

c) Euler’s Method

d) NR Method

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5. Degree of freedom increases, as

a) Reflux increases

b) Purity decreases

C) Purity increases

D) Reflux decreases

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6. Extreme purity is confessed to be?

a) 90.0%

b) 99.8%

c) 99.1%

d) 99.9%

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7. Energy input and internal flow affect each other.

a) True

b) False

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8. The end of an equilibrium curve is called as

a) Critical point

b) Triple point

c) End point

d) Single point

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9) In the below diagram, A Curve represents?

a) Final cost

b) Operating cost

c) Feed cost

d) Tray cost

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10. In the below diagram, B Curve represents?

a) Final cost

b) Operating cost

c) Feed cost

d) Tray cost

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## Set 2

1. The underwood’s equation, implies of using trial and error for finding

a) Θ

b) α

c) β

d) Ω

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2. The ratio of the key components is essentially equal to their ratio in liquid feed, was given by?

a) Underwood

b) Gilliland

c) Brown-Martin

d) Fenske

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3. Colburn Method can be used to calculate the _____ in a binary system.

a) Minimum Reflux

b) Maximum Reflux

c) Minimum Trays

d) Maximum Trays

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4. Colburn method is based on the

a) Constant Molar Overflow and relative volatility

b) Steady state flow

c) Reflux ratio

d) Maximum Trays

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5. A non-key component may be distributed, if it has volatility

a) Very far to one from other keys

b) Same as that of non-key

c) Very close to that of one keys

d) Constant Molar Overflow

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6. If the flow rates of liquid and distillate are 150 kmol/h and 100 kmol/h. Find reflux ratio?

a) 90

b) 50

c) 15

d) 30

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7. If S=8.137 and α =1.956. Then No. of stages are?

a) 13

b) 14

c) 12

d) 16

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8. The ROSE Method involves the plot of

a) 1/R vs 1/N

b) 1/S vs 1/N

c) 1/S vs 1/R

d) 1/T vs 1/P

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9. The Ratio of optimum feed stages to total number of stages is

a) Dependent on number of stages

b) Independent of number of stages

c) Independent of total stage

d) Inversely proportional.

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10. The K value of Methane at 205^{o}F is?

a) 15

b) 28

c) 16

d) 1.65

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## Set 3

1. The number of theoretical stages, depends on the

a) Stepping off the tray

b) Reflux ratio

c) Operating line

d) Flow rates

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2. When R is infinite, the slope of this rectifying becomes

a) 0

b) 1

c) 0.5

d) Can’t be specified

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3. If x=0.4 and y =0.6633 and point x_{D} (0.9, 0.9). Then estimate Rmin

a) 0.9

b) 0.4734

c) 0.4

d) 0.66

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_{min}/R+1 = (0.9-0.6633)/ (0.9/0.4) = 0.4734 then 0.4734/1-0.4734 = 0.9.

4. If distillate is 95%, and withdrawal is 4 and α=2.5. Estimate total number of tray?

a) 7.7

b) 10

c) 6.7

d) 5.7

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5. For non-ideal cases, to calculate number of stages we use

a) Point efficiency

b) Murphree efficiency

c) Tray efficiency

d) Overall efficiency

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6. Minimum reflux ratio in a distillation column results in

a) Optimum no. of trays

b) Minimum reboiler size

c) Maximum condenser size

d) Minimum number of trays

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7. In a tray column, Murphree efficiency

a) Exceed 100%

b) Equal to 100%

c) Can’t be specified

d) Depend upon cases given

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8. For value of m, the change in liquid concentration is independent of tray location if

a) L/V = 1

b) V/L =1

c) L/mV=1

d) Vm/L=1

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9. At minimum reflux, No. stages are

a) Unity

b) Infinite

c) Zero

d) Negative

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10. Scaling up from pilot scale to industrial scale only increases

a) Feed rates

b) Reflux ratio

c) No. of stages

d) Composition

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## Set 4

1. For the light key component, Equilibrium relation is

a) yK=x

b) Kx=y

c) Depend upon trays

d) Can’t be specified

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2. If the fractional recovery of light key in the distillate is F_{R}, then light key in the feed is

a) Dx_{D}= (FR_{D})+Fx_{LK}

b) Dx_{D}= (FR_{D})/Fx_{LK}

c) Dx_{D}= (FR_{D})Fx_{LK}

d) Dx_{D}= (FR_{D})

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_{D}= (FR

_{D}) Fx

_{LK}, while gives us the material balance on feed and distillate Dx

_{D}= (FR

_{D}).

3. For multi-component systems, Underwood Equations gives

a) Minimum Reflux

b) Minimum Strip

c) Maximum Reflux

d) Minimum Trays

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4. Gilliland Correlation is arranged to estimate the

a) Numbers of Stages

b) Numbers of Reboiler

c) Numbers of Feed

d) Numbers of Column

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5. Gilliland’s y intercept is given as

a) N_{min}/N+1

b) N-N_{min}/N+1

c) N+N_{min}/N+1

d) N/N+1

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_{min}/N+1 on y axis, where N is the number of stages.

6. Gilliland’s x intercept is given as

a) R_{min}/R+1

b) R/R+1

c) N_{min}/R+1

d) R-R_{min}/R+1

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_{min}/R+1 on x axis, where R is the reflux ratio of the system.

7. Optimum feed-stage location, can be obtained by using

a) Gilliland correlation

b) Kirk bride correlation

c) Fenske’s correlation

d) Sorel’s correlation

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8. For Multicomponent Mixtures Equilibria depend on ?

a) Pressure

b) Temperature

c) Humidity

d) Enthalpy

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9. In multicomponent distillation, the separation of components is calculated using

a) Assumed flows of species

b) Assumed flows of reflux

c) Assumed flows of Vapor

d) Assumed flows of liquid

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10. Once the components are identified, in a multicomponent distillation they are called

a) Key Components

b) Mixed Components

c) Flow Components

d) Gain Components

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## Set 5

1. Rigorous methods are only applied to

a) Small columns

b) Large columns

c) Dual columns

d) Triple columns

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2. Rigorous methods are used as primary

a) Stage calculation tools

b) Cost calculation tools

c) Control optimization tools

d) Design and optimization tools

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3. An equilibrium stage that contains no feed, side products or heat exchangers is called

a) Final stage

b) Simple stage

c) First stage

d) Exit stage

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4. A stage that contains more than one feed, side products or heat exchangers is called

a) Simple stage

b) Multi Stage

c) Complex stage

d) Pure stage

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5. In a multicomponent operation, i and j are

a) Variables of flow

b) Component and stage

c) Reflux and Boil up

d) Feed ratio

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6. MESH stands for?

a) Material, equilibrium, summation and heat

b) Mass, equilibrium, simulation and heat

c) Makeup, equilibrium, subject and heat

d) Material, equilibrium, summation and Height

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7. When a solution is said to be formed?

a) All MESH equation are zero

b) All MESH equation are infinite

c) All MESH equation are satisfied

d) All MESH equation are unity

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8. Murphree equation is used for calculating?

a) Stage calculation

b) Equilibrium condition

c) Reflux ratio

d) Tray efficiency

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9. The term K_{ij}V_{j}/L_{j} is called

a) Stripping factor

b) Absorption Factor

c) Reflux Ratio

d) Boil up

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_{ij}V

_{j}/L

_{j}is called Stripping factor, where K

_{ij}represents the k factor and V and L are gas and liquid flow rates respectively.

10. The term L_{j}/V_{j}K_{ij} is called

a) Stripping factor

b) Absorption Factor

c) Reflux Ratio

d) Boil up

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_{j}/V

_{j}K

_{ij}is called Absorption Factor, this is also called as the inverse of the stripping factor.