DAY 2- CEP Flashcards by . .

Fresh water carrying pipelines in chemical
industries are colored with __________ color.

Sea Green

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Which of the following material is seldom used
for pressure vessel construction?

Rimmed Steel

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25 percent cut segmental baffle means that
the baffle

Height is 75% of the ID of the shell

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The ratio of shear stress to shear strain is
called

Shear Modulus

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Liquid/petroleum fuel storage tanks are built
underground (as in case of petrol pumps),
when the storage capacity is less than
__________ kilolitres.

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With increase in the number of shell passes,
the value of Ft

Increases

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Le/D for fully open globe value may be around

300

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Holes of a sieve tray are arranged in triangular
pitch of __________ times the hole diameter.

2.5 to 5

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In case of a shell and tube heat exchanger,
the minimum shell thickness for carbon steel
(inclusive of corrosion allowance) depends on
shell diameter and is in the range of
__________ mm.

5 to 11

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In case of bubble cap distillation column of
diameter greater than 1.2 meters, the cap
diameter is roughly about __________ cm.

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Tube side pressure drop in a 1-2 heat
exchanger (for turbulent flow of fluids through
the tubes) is about __________ times, that in
a 1-1 heat exchanger having the same size &
number of tubes and operated at the same
liquid flow rate.

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In a heat exchanger, shell side fluid velocity
can be changed by changing the tube

layout and pitch

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It is not desirable to design a heat exchanger
for LMTD correction factor, FT, of less than

0.8

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Triangular pitch tube layout as compared to
square pitch in a shell and tube heat
exchanger

permits the use of more tubes in a given shell diameter

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Bracket supports are the most suitable for
supporting __________ vessels.

thick walled vertical

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Two iron pipes of the same nominal diameter
but different schedule numbers will have the
same

inside diameter

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Lessing ring is formed by the addition of a
partition across the centre of a raschig ring,
which results in an area increase of about
__________ percent.

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_ tray arrangement is recommended for
distillation column having diameter up to 4 ft.

Cross Flow

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Shell side heat transfer co-efficient in case of
square pitch as compared to the triangular
pitch under similar condition of fluid flow and
tube size is

Less

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What is the value of ‘q’ for saturated liquid
feed to a distillation column ?

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The main purpose of providing stepping on the
trays is to

facilitate handling of large flow rate of liquid

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Needle valves are generally not used for

very large diameter pipes

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Which of the following is an undesirable
dynamic characteristic of an instrument ?

time lag

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Response of a system to a sinusoidal input is
called __________ response

frequency

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Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.

chemical properties

Which of the following is the most suitable for extraction in a system having very low density difference ?

centrifugal extractor

Which of the following is the most suitable for extraction in a system having very low density difference ?

centrifugal extractor

Total reflux in a distillation operation requires minimum A. reboiler load B. number of plates C. condenser load D. all (a), (b) and (c)

number of plates

Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the A. relative volatility is reasonably constant. B. mixture (to be separated) shows negative deviation from ideality. C. mixture (to be separated) shows positive deviation from ideality. D. multicomponent distillation is involved.

relative volatility is reasonably constant.

When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

natural

Which of the following is used to set the diameter of the distillation column ? A. Number of theoretical plates. B. Static submergence. C. Allowable vapor velocity. D. Length of straight rectangular weir on cross- flow tray.

Allowable vapor velocity

Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation? A. Sorel-Lewis method. B. McCabe-Thiele's method. C. Ponchon-Savarit method. D. none of these.

Sorel-Lewis method.

Saddle supports are used for supporting __________ vessels.

Horizontal Cylindrical

Solvent extracted oil A. has low free fatty acid content. B. is odorless. C. has more of unsaturates. D. none of these.

none of these.

Which of the following is not required in the manufacture of soda ash by Solvay process ? A. Ammonia B. Nitric acid C. Limestone D. None of these

Nitric Acid

The purpose of tanning in leather industry is to

to stiffen the leather

Kaoline is a/an

Refractory Material

Phenol is mainly used

to produce phenol formaldehyde

Main constituent of dolomite is

MgCO3

Conversion of CO to CO2 by steam in presence of a catalyst is called

shift conversion

Bleaching action of bleaching powder is due to its __________ properties.

oxidizing

Portland cement consists mainly of

CaO and SiO2

__________ glass has the lowest coefficient of thermal expansion and hence is more heat resistant.

Pyrex

Mannheim furnace is used in the manufacture of

hydrochloric acid

Thermosetting materials

are cross-linked molecules.

__________ iron is the purest form of iron.

Wrought

Enamels

give good glossy finish.

Black liquor is converted into white liquor by A. evaporation and burning the concentrate followed by causticisation of products. B. multi-effect evaporation only. C. selective liquid extraction. D. extractive distillation.

A. evaporation and burning the concentrate followed by causticisation of products.

Varnish does not contain

pigment

Liquor poisoning generally occurs due to the presence of __________ in it.

methyl alcohol

Which of the following same diameter columns gives lowest pressure drop per unit height ?

Packed Column

Neoprene is chemically known as

Polychlorepene

Molecular weights of polymers are in the range of

10^2 to 10^7

In distillation columns, the number of bubble caps per tray primarily depends upon the

allowable gas and liquid velocities.

Vertical vessels are not supported by

saddles

Pick out the wrong statement about the design of a sieve plate column. A. An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns. B. For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design. C. Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 meters and 100 mm for larger diameter columns. D. Minimum recommended downcomer residence time for the disengagement of entrained vapor is the same for both foaming and non-foaming liquids, which is about 20 seconds.

Rivets are generally specified by the

Shank Diameter

Oleum produces fumes of

SO3

20% oleum means that in 100 kg oleum, there are 20 kg of A. SO3 and 80 kg of H2SO4 B. H2SO4 and 80 kg of SO3 C. SO3 for each 100 kg of H2SO4 D. none of these.

A. SO3 and 80 kg of H2SO4

Inversion of sucrose produces

Glucose

Linde process of gas liquefaction employs

adiabatic expansion through a throttle valve (Joule-Thomson expansion)

The major use of butadiene is

in the manufacture of synthetic rubber.

Hydrogenation of oil takes place in a/an __________ reactor.

trickle bed reactor

Fatty material used in soap making is

Tallow

__________ glass is used for the manufacture of optical glass.

Flint

Favorable conditions for the liquefaction of gases in general are

high pressure & low temperature.

Which of the following is an yellow pigment ? A. Titanium dioxide C. Ferrous sulphate B. Lead chromates D. Zinc sulfides

Ferrous Sulphate

Common salt is generally not produced commonly by __________ method from brine.

Freeze Drying

Sulphuric acid is mainly used in the __________ industry.

Fertilizer

Main use of hydrazine is

rocket fuel

Main use of liquid nitrogen is in

refrigerant cooling

Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid.

Vinyl Chloride

Chemical formula of oleum is

H2S2O7

Yellow glycerine is made into white, using

Activated Carbon

Gypsum is chemically

Calcium Sulfate

Zeigler process

produces high density polyethylene.

Sea weeds are an important source of

Iodine

Which of the following is not the triple point of water ? A. 32°R B. 492°R C. 273°K D. 32°F

A. 32°R

Pick out the one which is a first order instrument. A. Mercury in glass thermometer (without any covering or air gap). B. Bare metallic thermometer. C. Bare vapor pressure thermometer. D. All (a), (b) and (c).

D. All (a), (b) and (c).

Load cells are used for the measurement of

weight

Pick out the wrong statement. A. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons. B. CO2 is the strongest paramagnetic gas. C. Paramagnetic susceptibility of gases decreases with temperature. D. Paramagnetic susceptibility of gases permits the measurement of their concentration.

B. CO2 is the strongest paramagnetic gas.

A negative gain margin expressed in decibels means a/an __________ system.

unstable

Thermistor which has high temperature coefficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

solid-semi conductor

Flapper nozzle is used in a/an __________ controller.

pneumatic

Working principle of radiation pyrometer is based on the

Stefan-Boltzman law

Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?

Thomson effect

Dilute wine was used as a thermometric liquid initially to develop temperature scale. First empirical temperature scale developed was the __________ scale.

Fahrenheit scale

Which of the following is a desirable characteristic of an instrument ? A. High drift B. High fidelity C. High measuring lag D. Poor reproducibility

B. High fidelity

Response of a system to a sinusoidal input is called __________ response.

Frequency

Bubble cap tray is the most commonly used tray in large distillation column, because

of its flexibility and nearly constant efficiency under varying conditions of operation.

Apex angle of conical heads used in the bottom heads of chemical process equipment is usually

60 deg

Nominal size of a pipe is an indication of its __________ diameter.

approximate

In shell and tube heat exchangers, straight tie rods are used to

hold baffle in space.

The ratio of pressure forces to inertial forces is called the __________ number.

Euler

The ratio of inertial forces to elastic forces is called the __________ number.

Mach

The friction factor is A. always inversely proportional to the Reynolds number. B. not dimensionless. C. not dependent on the roughness of the pipe. D. none of these.

None of these

If Blausius or Darcey friction factor is 'f1' then the Fanning friction factor is equal to

f1/4

The fluid property, due to which, mercury does not wet the glass is

surface tension

When the momentum of one fluid is used for moving another fluid, such a device is called a/an

jet pump

The normal stress is the same in all directions at a point in a fluid, when the fluid is

having no motion of one fluid layer relative to the other.

When the momentum of one fluid is used for moving another fluid, such a device is called a/an

jet pump

Most commonly used joint in the underground pipe lines is the

sleevejoint

Water hammer in a pipeline results from the

rapid pressure change due to a rapid change in the rate of flow.

Maxwell's thermodynamic relations applies to the

chemical systems in equilibrium.

Which of the following is not an explosive ? A. TNT B. CMC C. RDX D. Lead azide

CMC

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.

Breeder

Foot valves provided in pumps are __________ valves.

directional control

The most suitable material of construction for a sewer to carry sewage under high pressure is

steel

__________ addition increases the depth of hardness of steel.

chromium