COACHING DAY2 Flashcards by Michael Gunasekaran

Fresh water carrying pipelines in chemical industries are colored with?

Sea green

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

Rimmed Steel

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25% 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 _______ kiloliters

45 kiloliters

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

Increases also

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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 a 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 a carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of _____ mm.

5-11

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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?

10 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 the 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flowrate

8 times

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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 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 the raschig ring, which results in an area increase of about ______

20%

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

less

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_______ tray arrangement is recommended for distillation columns having diameter up to 4ft.

Cross flow tray

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

q = 1

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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 characterstic of an instrument?

Time lag

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Response of a system to a sinusoidal input is called ________

frequency response

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Mass transfer rate between two fluids 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

Total reflux in a distillation operation requires minimum?

number of plates

Fenske's equation for determining the minimum number of theoretical stages in the distillation column holds good, when the?

Relative volatility is reasonably constant

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

natural

Which of the following is used to set the diameter of the distillation column?

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?

Sorel-Lewis method

Saddle supports are used for supporting _______ vessels

Horizontal Cylindrical

Solvent Extracted oils 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

Nitric Acid

The purpose of tanning in the leather industry is to

Stiffen the leather

Kaoline is a/an

Refractory material

Phenol is mainly used

To produce phenol formaldehyde

The main constituent of dolomite is

MgCO3 - Magnesium Carbonate

Conversion of CO to CO2 by steam in the 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 & SiO2

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

pyrex

Mannheim furnace is used in the manufacture

HCl - Hydrochloric acid

Thermosetting material

are cross-linked molecules

_______iron is the purest form of iron

Wrought Iron

Enamels

give good glossy finish

Black liquor is converted into white liquor by:

evaporation and burning the concentrate followed by causticisation of products

Varnish does not contain

Pigments

liquor poisoning generally occurs due to the presence of _____in it

methyl alcohol (methanol)

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 velocity

Vertical vessels are not supported by

Saddles

Pick out the wrong statement about the design of a sieve plate column

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

What is an Ore?

substance in which a metal can be extracted from it

Oleum produces fumes of

SO3

20% oleum means that in 100 kg oleum there are 20 kg of

SO3 and 80kg of H2SO4

Inversion of sucrose produces

Glucose

Linde process of gas liquefaction employs

Adiabatic expansion through a throttle valve ( Joule-Thompson expansion)

The major use of butadiene

in the manufacture of synthetic rubber

Hydrogenation of oil takes place in a/an ______ reactor

Trickle bed reactor

Fatty material 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 a yellow pigment?

Ferrous sulphate

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

Freeze drying

Sulpuhric acid is mainly used in the ________ industry

Fertilizer

Main use of hydrazine

Rocket Fuel

Main use of liquid nitrogen

Refrigerative cooling

Raw material required for the manufacture of ________ is acetylene and hydrochloric acid

vinyl chloride

Chemical formula of oleum

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

32R

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).

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.

CO2 is the strongest paramagnetic gas

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

Unstable

Thermistors, which have a high temperature coefficient of resistivity, are used as the sensing element in resistance thermometer. it is a/an

Solid semi-conductors

Flapper nozzle is used in a/ an _______ controller

pneumatic

The working principle of radiation pyrometer is based on the

Stefan-Boltzman law

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

Thompson effect

Dilute wine was used as a thermometric liquid initially to develop temperature scales. The first empirical temperature scale developed was the _________ scale

Fahrenheit scale

Which of the following is a desirable characteristic of an instrument.

High Fidelity

The response of a system to a sinusoidal input is called _______ response

Frequency

Bubble cap tray is the most commonly used tray in large distillation

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 equipments

60 degrees

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 baffles in space

The ratio of pressure forces to inertial forces is called the ________ number

Euler

The ratio of the 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

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.

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?

CMC

If a nuclear reactor produces more fissile nuclear fuels that are consumed, 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

COACHING DAY2 Flashcards

(108 cards)