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D2 > Oct 2023 > Flashcards

Oct 2023 Flashcards

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1
Q

The Monod Model relates
A. substrate utilized with the biomass consumption
B. specific growth rate to the substrate availability
C. yield with the biomass utilization
D. the biomass concentration with specific growth rate

A

specific growth rate to the substrate availability

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2
Q

A fed-batch reactor containing 2 litre of medium and 0.1 g.|-‘ of biomass is fed with a medium containing 1 g.I-1 of substrate at 1 litre per hour. If after 10 hours, the concentration of biomass in the reactor was 0.2 g.’, then the biomass produced during the 10 hour period is
A. 1.5 g
B. 2.2 g
C. 3.0 g
D. 6.0 g

A

2.2

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3
Q

These are group of microorganisms that can grow and often thrive in areas of high salt concentration. (Not exactly the used words, pero ganito ‘yung ibig sabihin nung tanong)
Mukhang nasa indiabix lang din an exact tanong.
(a) acidophiles (b) halophiles (c) hydrophiles (d)
akaliphiles

A

halophiles

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4
Q

This is a bacterium species that is capable of breaking down plastic polyethylene terephthalate (PET) or polyester.

A

Ideonella Sakaiensis

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5
Q

What happens to the concentration of
biomass, substrate, and product concentrations for continuous reactor at steady state’?
A. Increases,
B. Decreases,
C. Remains constant,
D. Zero

A

Remains constant

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6
Q

IBX: Kine (Section 10)
The enzyme which can catalyse the conversion of glucose to ethyl alcohol is
A. invertase
B. maltase
C. diastase
D. zymase

A

zymase

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7
Q

IBX: Kine (Section 9)
With increase in initial concentration, the fractional conversion of a first order reaction in a given time
A. increases
B. decreases
C. remains constant
D. unpredictable

A

remains constant

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8
Q

IBX: Chemical Reaction Engineering (Section 9)
The rate of reaction of a/an
reaction is not affected by temperature rise.
A. autocatalytic
B. photochemical
C. consecutive
D. zero order.

A

photochemical

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9
Q

IBX: Chemical Reaction Engineering (Section 9)
Half-life period for a first order reaction is the initial concentration of the reactant.
A. directly proportional to
B. inversely proportional to
C. independent of
D. none of these

A

independent of

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10
Q

IBX: Kine (Section 10)
An example of autothermal reactor operation is
A. sulphur dioxide oxidation
B. ethylene oxidation
C. benzene oxidation
D. ammonia synthesis

A

ethylene oxidation

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11
Q

IBX: Chemical Reaction Engineering (Section 8)
The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always
A. 1
B. < 1
C. > 1
D. equal to the order of reaction

A

> 1

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12
Q

IBX: Chemical Reaction Engineering (Section 9)
With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)
A. increases
B. decreases
C. remains same
D. increases linearly

A

increases

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13
Q

IBX: Chemical Reaction Engineering (Section 10)
Rate of a chemical reaction is independent of the concentration of the reactants for a
reaction.
A. zero order
B. third order
C. consecutive
D. none of these

A

zero order

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14
Q

IBX: Chemical Reaction Engineering (Section 10)
The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is
A. 0.875
B. 0.5
C. 0.425
D. data insufficient to calculate

A

0.875

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15
Q

IBX: Chemical Reaction Engineering (Section 10)
The concentration of A in a first order reaction, A - B, decreases
A. linearly with time.
B. exponentially with time.
C. very abruptly towards the end of the reaction.
D. logarithmically with time.

A

exponentially with time

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16
Q

IBX: Chemical Reaction Engineering (Section 5)
The rate at which a chemical substance reacts is proportional to its
A. active mass
B. molecular weight
C. equivalent weight
D. atomic weight

A

active mass

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17
Q

IBX: Fluid Mechanics (Section 2)
Hydraulic intensifier is used for increasing the
A. rate of velocity of liquid supply.
B. rate of flow through delivery pipeline of a pump.
C. intensity of pressure of the liquid.
D. momentum rate through delivery pipe.

A

intensity of pressure of the liquid.

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18
Q

IBX: Fluid Mechanics (Section 1)
The dimension of dynamic viscosity is
A. M L^-1 T^-1
B. L^2 T^-1
C. L T^-2
D. M L^-1 T^-2

A

M L^-1 T^-1

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19
Q

IBX: Mechanical Operations (Section 1)
In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the
A. square root of the velocity.
B. square of the viscosity.
C. filtration time only.
D. washing time only.

A

square root of the velocity.

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20
Q

IBX: Mechanical Operations (Section 3)
Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?
A. Parabola
B. Straight line
C. Hyperbola
D. Exponential curve

A

Parabola

21
Q

IBX: Mechanical Operations Section 2)
Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a
A. disc bowl centrifuge.
B. sharpies supercentrifuge.
C. batch basket centrifuge.
D. sparkler filter.

A

disc bowl centrifuge.

22
Q

IBX: Mechanical Operations (Section 4)
In filtration, the use of ‘filter aid’ helps in
A. reducing the filtration pressure.
B. accelerating the rate of filtration.
C. deplugging the filter medium.
D. enhancing the cake porosity in case of a dense impermeable cake.

A

deplugging the filter medium.

23
Q

IBX: Mechanical Operations (Section 3)
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __ mm.
A. 0.007
B. 0.30
C. 50
D. 0.014

A

0.30

24
Q

IBX: Mechanical Operations (Section 7)
Colloidal mills are used for grinding.
A. coarse
B. intermediate
C. fine
D. ultrafine

A

ultrafine

25
Q

IBX: Process Eqpt and Plant Design (Section 7)
A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is
about _ percent or the flooding velocity
A. 45
B. 60
C. 80
D. 95

A

80

26
Q

IBX: Process Egpt and Plant Design (Section 7)
What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers ?
A. 6.5 cms
B. 6.5 mm
C. Equal to tube I.D
D. Equal to tube O.D

A

6.5 mm

27
Q

IBX: Process Eqpt and Plant Design (Section 6)
In the case of a shell and tube heat exchanger, the logarithmic mean temperature
difference
A. Is always less than arithmetic average value.
B. is always more than arithmetic mean value and the geometric mean value.
C. is always less than arithmetic mean value, but more than geometric mean value.
D. may be either more or less than geometric mean and arithmetic mean value depending
upon whether the flow of stream is co-current or counter-current.

A

Is always less than arithmetic average value.

28
Q

IBX: Process Egpt and Plant Design (Section 6)
Smoker’s equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the
A. relative volatility is close to one (e.g., separation of close boiling isomers).
B. feed is not at its bubble point.
C. number of equilibrium stages in only stripping section is to be calculated.
D. number of equilibrium stages required is likely to be very small.

A

relative volatility is close to one

29
Q

IBX: Process Egpt and Plant Design (Section 8)
The ratio of lateral strain to linear strain is termed as the
A. Poisson’s ratio
B. bulk modulus
C. modulus of elasticity
D. shear modulus

A

Poisson’s ratio

30
Q

IBX: Process Egpt and Plant Design (Section 6)
Joint efficiency (J) for a seamless pipe is
A. 1
B. 0.85
C. 1.2
D. < 0.5

A

1

31
Q

IBX: Process Egpt and Plant Design (Section 6)
Baffles may be eliminated for
A. low viscosity liguids (< 200 poise).
B. high viscosity liquids (> 600 poise).
C. large diameter tanks.
D. none of these.

A

high viscosity liquids (> 600 poise)

32
Q

IBX: Process Eqpt and Plant Design (Section 6)
Generally, no corrosion allowance in wall thickness of a part is required, if the thickness
is more than __ mm.
A. 10
B. 20
C. 30
D. 5

A

30

33
Q

IBX: Process Eqpt and Plant Design (Section 5)
At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.
A. higher
B. lower
C. same
D. unpredictable

A

lower

34
Q

IBX: Mass Transfer (Section 3)
Weight of 1 m3 of humid air as compared to 1 m of dry air, under the same conditions, is
A. less
B. more
C. same
D. unpredictable

A

less

35
Q

IBX: Mass Transfer (Section 13)
Which of the following provides maximum contact surface for a liquid-vapour system?
A. Packed tower
B. Bubble-cap plate column
C. Seive-plate column
D. Wetted wall column

A

Packed tower

36
Q

IBX: Mass Transfer (Section 10)
Flooding in a column results due to
A. high pressure drop
B. low pressure drop
C. low velocity of the liquid
D. high temperature

A

high pressure drop

37
Q

IBX: Mass Transfer (Section 1)
Fenske equation determines the
A. maximum number of ideal plates.
B. height of the distillation column.
C. minimum number of theoretical plates.
D. optimum reflux ratio.

A

minimum number of theoretical plates.

38
Q

IBX: Mass Transfer (Section 13)
Most important factor to be considered in the selection of packings for absorbers is the
of packing.
A. size
B. durability
C. porosity
D. cost

A

porosity

39
Q

IBX: Mass Transfer (Section 1)
In distillation, overhead product contains
A. only one component
B. two components
C. any number of components
D. only saturated liquid

A

any number of components

40
Q

If the slope of the q-line is a horizontal line, what is the feed condition? (Indiabix)

A

Saturated Vapour

41
Q

IBX: Heat Transfer (Section 10)
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is
A. 1.66
B. 88.66
C. 3.66
D. dependent on NRe only

A

3.66

42
Q

IBX: Heat Transfer Section 10)
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Belter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of
A. 1
B. 1.74
C. 6.1
D. 37

A

6.1

43
Q

IBX: Heat Transfer (Section 1)
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer coefficient
A. increases
B. decreases
C. is not affected
D. may increase or decrease; depends on the feed

A

decreases

44
Q

IBX: Heat Transfer (Section 1)
The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the coefficient of performance as a heat pump (COP)нр are
A. (COP)R = (COP)нр = 0.6
B. (COP)R = 2.5; (COP)нр = 1.5
C. (COP)R = 1.5; (COP)нр = 2.5
D. (COP)R = (COP)нр = 2.5

A

(COP)R = 1.5; (COP)нр = 2.5

45
Q

IBX: Heat Transfer (Section 10)
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m?. The flux, when the element temperature is increased to 1000°C for the same furnace temperature is
A. 11.2 kW/m^2
B. 12.0 kW/m^2
C. 14.6 kW/m^2
D. 16.5 kW/m^2

A

16.5 kW/m^2

46
Q

IBX: Heat Transfer (Section 9)
Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around
_ BTU.
A. 180
B. 970
C. 3.97
D. data insufficient, can’t be predicted

A

180

47
Q

What is the force applied perpendicular to an object’s surface per unit area?

A

pressure

48
Q

Relating to triple point
(a) Celsius
(b) Kelvin
(c) Fahrenheit
(d) Rankine

A

Kelvin

49
Q

What is the use of surfactants in paints and emulsions?

A

lower the surface tension of the liquid paint

D2 (3 decks)

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