TNPSC Executive Officer Grade-I Chemical Engineering

Bthe energy absorbed by the solid to that fed to the machine
Cthe energy fed to the machine to the surface energy created by the crushing
Dthe energy absorbed by the solid to the surface energy created by the crushing.

Question 30 :
Rittinger's crushing law states that
Awork required to form a particle of any size is proportional to the square of the surface to volume ratio of the product.
Bwork required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product.
Cwork required in crushing is proportional to the new surface created

Dfor a given machine and feed, crushing efficiency is dependent on the size of feed and product.

Question 31 :
Work index is defined as the
Agross energy [kWh/ton of feed] needed to reduce very large feed to such a size that 80% of the product passes a 100 micron screen.

Benergy needed to crush one ton of feed to 200 microns
Cenergy [kWh/ton of feed] needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen.
Denergy needed to crush one ton of feed to 100 microns.
Explanation:

Question 32 :
The operating speed of a ball mill should be ............. the critical speed.
Aless than

Bmuch more than
Cat least equal to
Dnone of these

Question 33 :
A fluid energy mill is used for
Acutting
Bgrinding
Cultragrinding

Dcrushing

Question 34 :
For the preliminary breaking of hard rock, we use
Agyratory crusher

Bball mill
Ctube mill
Dsquirrel-cage disintegrator.

Question 35 :
With increase in the capacity of screens the effectiveness
ARemains unchanged
BIncreases
CDecreases

DIncreases exponentially

Question 36 :
A classifier is a device that
ASeparates solids into two fractions

BVirtually removes all the particles from a liquid
CSettles the particles from a liquid by sedimentation
DHelps to suspend the particle in the liquid

Question 37 :
Filter medium resistance is that offered by the
Afilter cloth
Bembedded particles in the septum
Cfilter cloth and the embedded particle collectively

Dnone of these

Question 38 :
The porosity of a compressible cake is
Aminimum at the filter medium

Bminimum at the upstream face
Cmaximum at the filter medium
Dsame throughout the thickness of cake.

Question 39 :
The most common filter aid is
Adiatomaceous earth

Bcalcium silicate
Csodium carbonate
Dsilica gel.

Question 40 :
Catalyst used in manufacture of sulphuric acid by chamber and contact processes are respectively
AV₂O₅ and Cr₂O₅
Boxides of nitrogen and Cr2O5
CV₂O₅ on a porous carrier and oxides of nitrogen
Doxides of nitrogen and V₂O₅ on a porous carrier.

Question 41 :
Contact process
Ayields acid of higher concentration than chamber process

Byields acid of lower concentration than chamber process
Cis obsolete
Deliminates absorber.

Question 42 :
Which of the following glasses is optically important for their high index of refraction and dispersion
ASodalime glass
BBorosilicate glass
CFloat glass
DLead glass

Question 43 :
Cement mainly contains
ACaO, SiO₂, Al₂O₃

BMgO, SiO₂, K₂O
CAl₂O₃, MgO, Fe₂O₃
DCaO, MgO, K₂O

Question 44 :
Gypsum is
Acalcium chloride
Bpotassium sulphate
Csodium sulphate
Dcalcium sulphate

Question 45 :
Oil is
Aa mixture of glycerides
Ba mixture of glycerides of fatty acids

Csolid at normal temperature
Dester of alcohols other than glycerin.

Question 46 :
Unsaturated oils compared to saturated oils have
Alower melting point and higher reactivity to oxygen

Bhigher melting point and higher reactivity to oxygen
Clower melting point and lower reactivity to oxygen
Dhigher melting point and lower reactivity to oxygen

Question 47 :
Solvent used for extraction of oil is
Ahexane

Bmethyl ethyl ketone
Cfurfurol
Dnone of these

Question 48 :
Detergents are manufactured from
AFatty acids
BGlycerin
CFats
DFatty alcohols.

Question 49 :
Catalyst used in hydrogenation of oil is
Anickel

Bplatinum
Ciron
Dalumina.

Question 50 :
Which of the following is a detergent
AFatty alcohol
BAlkyl benzene sulphonate

CFatty acids
DMethylene chloride

Question 51 :
The octane number of gasoline is increased by the addition of
ATetraethyl Lead (TEL)

BOrganophosphates
CSulphur
DGreases

Question 52 :
The ideal pulp for the manufacture of paper should have high
Acellulose content

Blignin content
Cboth (A) and (B)
Dnone of these

Question 53 :
Bleaching of paper pulp is done with
Aactivated clay
Bbromine
Cchlorine or chlorine dioxide

Dmagnesium sulphite

Question 54 :
Which of the following is super-efractory
ASilicon carbide

BInsulating brick
CMagnesia
DHigh alumina refractory

Question 55 :
Which of the following is not an antibiotic
APenicillin
BStreptomycin
CTetracyclin
DQuinine

Question 56 :
Penicillin is seperated from fermented broth by
Aextraction with amyl or butyl acetate

Bternary azeotropic distillation
Cevaporation in calendria
Dextractive distillation

Question 57 :
Carborundum consists mainly of
Abauxite
Bsilicon carbide

Cboron carbide
Dcalcium carbide

Question 58 :
Fire clay is
Aa basic refractory
Ban acidic refractory

Ca neutral refractory
Dnot a refractory material

Question 59 :
Calcination of limestone is not done in a ............ kiln for producing lime.
Avertical shaft
Brotary
Cfluidized bed
Dfixed bed

Question 60 :
A Newtonian fluid is one which
Ais frictionless and imcompressible
Bhas a linear relationship between the magnitude of applied shear stress and the resulting rate of deformation.

Chas a non-linear relationship between the magnitude of applied shear stress and the resulting rate of deformation
Dhas a vapour pressure of 1 N/m² at 25⁰ C

Question 61 :
Which curve in the given figure represents Newtonian fluid
AA

BB
CC
DE
Explanation:

Question 62 :
Which of the following has the form of a Mach number (NMa)
Av/√gl
Bv/c

CP/pv²
Dv²Lp/σ

Question 63 :
Friction factor f = 16/N_Re is valid for
Alaminar flow only

Bboth laminar and turbulent flows
Cturbulent flow only
Dtransition region only

Question 64 :
The momentum correction factor (β) is used in fluid flow problems to account for
Achange in pressure
Bchange in total energy
Cchange in direction of flow
Dnon-uniform direction of velocities at inlet and outlet sections.

Question 65 :
Cavitation in fluid flow occurs when
Athe pressure of flow reaches to a value close to its vapour pressure

Bthe total energy increase suddenly
Cthe total energy decreases suddenly
Dthe fluid velocity decreases to zero.

Question 66 :
Select the correct relation for centrifugal pumps at equal efficiencies.
A
B

Question 67 :
For a specific impeller diameter, fixed impeller speed of a centrifugal pump, and constant density,
ANPSH required decreases with increase in the capacity
BNPSH required increases with increase in the capacity
CNPSH required increases with increase in the capacity

DNPSH required and NPSH available both increase with increase in the capacity

Question 68 :
Cavitation in centrifugal pumps is caused by
Ahigh fluid velocity at the suction
Blow barometric pressure
Clow suction pressure

Dhigh suction pressure

Question 69 :
When heat is transferred by a chain of molecules from the hot area of an object to a colder area, the process of heat transfer is called
Anatural convection
Bforced convection
Cconduction

Dradiation

Question 70 :
The thermal diffusivity of a material is defined as
AK/(pCp)

B(pCp)/k
C(kCp)/p
D(kp)/Cp

Question 71 :
The Fourier number (N) is defined as
AtL²/∝
B∝t/r²

ChL/k
Dhk/L

Question 72 :
In forced convection the heat transfer depends on
AN^Re only
BN^Pr only
CN^Reand N^Pr

Dnone of these

Question 73 :
Dittus-Boelter equation, N_Nu=0.023 (N_Re) (N_Pr)ⁿ, where n = 0.4 for hot fluid and n = 0.3 for cold fluid, is applicable for
A10000Re<1.2×10⁵
B0.7Pr<120
CL/D>60
Dall of these

Question 75 :
In a finned tube heat exchanger
Aonly heat transfer area is augmented

Bonly film coefficient is augmented
Cboth heat transfer area & film coefficient are augmented
Dnone of these

Question 76 :
25 per cent cut segmental baffle means
Aa baffle plate whose height is 25% of the inside diameter of the shell
Ba baffle plate whose height is 75% of the inside diameter of the shell

Ca baffle plate whose height is 25% of the inside diameter of the tube
Da baffle plate whose height is 25% of the length of tube.

Question 77 :
Capacity of an evaporator is defined as
Athe number of kilograms of solvent vapourized per hour

Bthe number of kilograms of solvent vapourized per kilogram of steam fed to the evaporator
Cthe number of kilograms of steam consumed per hour
Dthe number of kilograms of steam consumed per kilogram of sovent vapourized

Question 78 :
Economy of an evaporator is defined as
Athe number of kilograms of steam consumed per hour
Bthe number of kilograms of steam consumed per kilogram of solvent vaporized
Cthe number of kilograms of solvent vaporized per hour
Dthe number of kilograms of solvent vaporized per kilogram of steam fed to the evaporator

Question 79 :

Match List I correctly with List II and select your answer using the codes given below :

List I	List II
a) Iλ =c₁^λ-5/e^c2/λT -1	1. Wien's Law
b) λT = constant	2. Planck's Law
c) E_b =σT⁴	3. Nusselt equation
d) h = 0.943 [k³ƒp²ƒλ_g/μ_lL∆Tƒ]^1/4	4. Stefan-Boltzmann's Law

Codes :

AA-2, B-1, C-4, D-3

Question 80 :
If n is the order of reaction, then unit of rate constant is
A1/(time) (concentration)^n-1
B(time)-1 (concentration)^n-1
C(time)^n-1 (concentration)
D(time^-1) (concentration)^1-n

Question 81 :
The rate of reaction doubles for each 10⁰C rise in temperature. What activation energy would this suggest at a temperature 25⁰C
A11810 cal/mol
B11820 cal/mol

C11825 cal/mol
D11830 cal/mol

Question 82 :
Sum of the powers of the concentration term in the rate equation is called the
Aorder of reaction

Bmolecularity
Celementary reaction
Dnone of these

Question 83 :
Transition state theory predicts the temperature dependency of reaction rate as
AK ∝ T
BK∝ e ^-E/RT
CK ∝ Te ^-E/RT

DK ∝ Te ^E/RT

Question 84 :
The reaction Cl₂+H₂ → 2HCL is carried out in the presence of sunlight. What is the order of reaction
A0

Question 85 :
Integral method is used for analysis of kinetic data
Afor testing complicated mechanism
Bwhen the data are scattered

Cwhen rate expressions are simple
Dnone of these

Question 86 :
A batch reactor is characterized by
AConstant residence tim
BVariation in extent of reaction and proportion of the reaction mixture with time

CVariation in reactor volume
DVery low conversion

Question 87 :
What is the partial pressure of a gas mixture containing 50 mol % A and 50 mol% inert in a closed vessel at pressure of 10 atm and temperature of 150⁰C
A10 atm
B4 atm
C5 atm

D6 atm

Question 88 :
The half-life time t_1/2 = 0.693 / k. Then the reaction is of
AZero order
BFirst order

CSecond order
DThird order

Question 89 :
Oil is hydrogenated using nickel catalyst in a
ABatch reactor
BFluidized bed reactor
CSlurry reactor

DFixed bed reactor

Question 90 :
Space velocity of 5 hr^-1 means that
AFive reactor volume of feed (at specified conditions) are being fed into the reactor per hour

BAfter every 5 hours, the reactor is being filled with the feed
CCent per cent conversion can be achieved in at least 5 hours
DA fixed conversion of a given batch of feed takes 5 hours

Question 91 :
For a recycle reactor the recycle ratio is given by
AR= Volume of fluid returned to the reactor inlet/Volume of fluid leaving the system

BR = Volume of fluid leaving the system/Volume of fluid returned to the reactor outlet
CR= Volume of fluid leaving the system/Volume of fluid retained in the reactor
DR= Volume of fluid retained in the reactor/Volume of fluid leaving the system

Question 92 :
Fluidised bed reactor is characterized by
Auniformity of temperature

Bcomparatively smaller equipment
Cvery small pressure drop
Dabsence of continuous catalyst regeneration facility

Question 93 :
In an ideal P.F.R at steady state conditions
Athe composition of reactants remains constant along a flow path
Bthe conversion of the reactant varies from point to point along a flow path

Cthere is no lateral mixing of fluid
Dall of these.

Question 94 :
Arr henius equation shows the variation of ......... with temperature
AReaction rate
BRate constant

CEnergy of activation
DFrequency factor.

Question 95 :
When a catayst alters rate of a chemical reaction, the value of rate constant
Aincrease
Bdecreases
Cconstant
Dremains increasing or decreasing depending upon the type of reaction

Question 96 :
For a batch system, the selectivity (S) is
AS = Moles of desired product formed/Moles of undesired product formed

BS= Moles of desired product formed/Moles of feed admitted to the system
CS= Moles of undesired product formed/Moles of desired product formed
DS = Moles of desired product formed/ Volume of fluid leaving the system

Question 97 :
For a reaction of zero order, the rate of reaction is
Aindependent of the concentration

Bdependent on concentration
Cdependent on temperature
Dindependent of temperature

Question 98 :
Inversion of cane sugar is a
ABimolecular reaction with second order
BBimolecular reaction with first order
CUnimolecular reaction with second order
DPseudo-unimolecular reaction with first order.

Question 99 :
A photochemical reaction is
ACatalyzed by light
BAccompanied with emission of light
CInitiated by light

DUsed to convert heat energy to light

Question 100 :
Transfer function of a second order system is
A1/r²S^{2^+2६rS+1}

B1/r²S^{2^+2rS+1}
C1/r²S^{2^+2६r+1}
DNone of these

Question 101 :
Response of a system to a sinusoidal input is called
Aimpulse response
Bunit step response
Cfrequency response

Dnone of these

Question 102 :
Which one of the following is a first order system
ADamped vibrator
BMercury in glass thermometer kept in boiling water

CInteracting system of two tanks in series
DNon-interacting system of two tanks in series

Question 103 :
The time required for the response to come within ± 5% of its ultimate value & remain there is known as
ARise time
BResponse time

CPeriod of oscillation
DDecay ratio

Question 104 :
Overshoot and decay ratio are related as
AOvershoot = Decay Ratio
BOvershoot = (Decay Ratio)²
COvershoot = (Decay Ratio)^1/2

DOvershoot = (Decay Ratio)^-1/2

Question 105 :
The difference between the new steady state value & the original value is called as
Aoffset

Berror
Cdeviation
Dnone of these

Question 106 :
Tracking of missiles & aircrafts are the well known examples of
AServo-type problem

BRegulator problem
CResponse problem
DSet point problem

Question 107 :
Transfer function of a transportation lag is
A
B
C
D

Question 108 :
The transfer function of a process is 1/16s²+8s+4 . If a step change is introduced into the system, then the response will be
Aoverdamped
Bunderdamped

Ccritically damped
Dnone of these

Question 109 :
Dead-time compensation is also referred as
ASmith predictor

BSingle loop control system
CRatio controller
DAdaptive controller.

Question 110 :
Hot wire anemometer is used to measure
ATemperature
BThermal conductivity
CSpecific heat
DFlow rate of fluids.

Question 111 :
The general condition for stability of a continuous system is
Athe roots of the characteristic equation fall in the right half of the complex plane.
Bthe roots of the characteristic equation fall in the left half of the complex plane

Cthe roots of the characteristic equation fall in the centre of the complex plane

Question 112 :
Controlling of more than one feedback loop is known as
Acascade control

Bratio control
Cfeed forward control
Dfeed backward control

Question 113 :
The error required to move the value from fully closed to fully open is termed as
Aoffset
Bset point
Cdifferential gap
Dproportional band

Question 114 :
Gain margin is equal to the
AAmplitude ratio
BGain in P controller
CGain in Pl controller
DReciprocal of Amplitude ratio.

Question 115 :
A sinusoidal variation in the input passing through a linear first order system
Abecomes more oscillatory (frequency increase)
Bbecomes less oscillatory (frequency decreases)
Cgets amplified (magnitude increases)
Dgets attenuated (magnitude decreases)

Question 116 :
The time constant of a first order process with resistance R & capacitance C is
AR+C
BR-C
CRC

D1/RC

Question 117 :
The basic principle involved in the measurement of temperature by thermocouple is
ARaman effect
BScebeck effect
CPeltier & Seebeck effect

DThomson & Peltier effect.

Question 118 :
A proportional controller with a gain of KC is used to control a first order process. The offset will increase if
AKC is reduced
BKC is increased

CIntegral control action is introduced
DDerivative control action is introduced.

Question 119 :
The primary task of a microprocessor based controller is
Aimplementation of control algorithm
Bprovide static & dynamic display on the monitor
Cprovide data acquisition & storage
Dall of these

Question 120 :
For a differential function f(x) to have maximum, df/dx & d²f/dx2 should be
Azero & negative

Bnegative & zero
Czero & positive
Dpositive & zero

Question 121 :
If p & q are roots of x²+px+q=0 then
Ap=1

Bp=2
Cp=0
Dp=-2

Question 122 :
Integrating factor of differential equation cos x dy/dx + y sin x = 1 is
Acos x
Btan x
Csec x

Dsin x

Question 123 :
Differential equation for y = A cos ∝ x + B sin ∝x, where A & B are arbitary constants, is
Ad²y/dx²- ∝²y=0
Bd²y/dx²+ ∝²y=0
Cd²y/dx²+ ∝y=0

Dd²y/dx²- ∝y=0

Question 124 :
The first differentiation of a constant is equal to.
A1
B> 1
C< 1
D0

Question 125 :
The PDE ∂²u/∂x²+∂²u/∂y² = f(x,y) is called as
AHeat equation
BWave equation
CLaplace equation
DPoisson's equation

Question 126 :
The auxiliary equation of (aD²+bD+c) = 0 is having two real & distinct roots m₁ & m_² then the general solution is
Ay=Ae^m₁y+Be^m₂y
By= Ae^m₁x+Be^m₂x

Cy=(Ax+B)e^m₁x
Dy=(Ax+B)e^m₂x

Question 127 :
Solution of differential equation xdy-ydx=0 represents
ARectangular hyperbola
BStraight line passing through origin

CParabola whose vertex is at origin
DCircle whose centre is at origin

Question 128 :
Order & degree of differential equation d²y/dx²={y+[dy/dx]²}^1/4 are
A4 & 2
B1 & 2
C1 & 4
D2 & 4

Question 129 :
The number of real roots of the equation

(x-1)²+(x-2)²+(x-3)² = 0 is
A2
B1
C0

Question 130 :
The solution for L (t² e^2t) is
A2/s³
B2/(s-2)³

C2(s+2)³
D4/(s+2)³

Question 131 :
The line y = mx +1 is a tangent to y² = 4x if m equals
A4
B2
C1

Question 132 :
The sum of the infinite series 3+1+1/3+(1/3)²+.........(1/3)ⁿ+.......... is
A9
B9/2

C15/2
D∞

Question 133 :
What type of graph sheet is used to get a straight line by plotting (x,y) for the equation y=axⁿ
ASemi-log graph
BLog-Log graph

CPolar graph
DNone of these

Question 134 :
Which one of the following is a method of curve fitting
AMethod of group averages
BLeast square method
CMethod of moments
Dall of these

Question 135 :
The normal equation for fitting a straight line y = ax+b is
A
B

Question 136 :
If a chemical substance disintegrates at a rate inversely proportional to the square of the amount present at any instant, what is the differential equation governing this law
AdN/dx ∝ 1/N²
BdN/dt ∝ 1/N
CdN/dt ∝ 1/N²

DdN²/dt² ∝ 1/N

Question 137 :
How many arbitrary constants will be there in the solution of second order differential equation
AThree
BOne
CTwo

DZero

Question 138 :
The solution for the equation ax²+bx+c=0 is given by
A
B

Question 139 :
The equation to find the roots by Regula falsi method is
A
B
C

Question 140 :
In a distillation operation, the heat removed in condenser
Aremains unaffected with change in reflux ratio
Bincreases with increase in reflux ratio

Cdecreases with increase in reflux ratio
Dand the heat required in reboiler decrease with increase in reflux ratio.

Question 141 :
Relative humidity is the ratio of
Apartial pressure of the vapour to the vapour pressure of the liquid at room temperature
Bpartial pressure of the vapour to the vapour pressure of the liquid at gas temperature

Cactual humidity to saturation humidity
Dnone of these

Question 142 :
In concurrent liquid-liquid extraction, the solvent B is used to separate solute C from a given solution A and C, The liquids A and B are insoluble. the slop of the operating line for each state will be
Azero
Bpositive
Cinfinity
Dnegative

Question 143 :
At plait point of a ternary system
Athe selectivity of solvent will be unity
Bthe distribution coefficient for solute will be unity
Cthe density difference between the two equilibrium phases becomes zero
Dall of these

Question 144 :
in counter-current liquid-liquid extraction, the maximum concentration of solute in extract layer
Ais that corresponding to equilibrium with the incoming feed

Bis less than the concentration corresponding to equilibrium with the incoming feed
Ccan be increased than that obtained in (A) above by using raffinate reflux
Dnone of these

Question 145 :
Absorption factor is defined as
AS₂/S₁
BS₁ × S₂
CS₂ - S₁
DS₁/S₂

Question 146 :
Desorption of the absorbed solute by solvent is called
Areverse osmosis
Bdialysis
Csublimation
Delution

Question 147 :
Higher hold up of the solid in the rotary drier results in
Aincreased drying action
Bpoor exposure of the solid to the gas
Can increase in power required for operating the drier
Dall of these

Question 148 :
Minimum number of ideal stages are required in a fractionating column when the reflux ratio is equal to
Aminimum reflux ratio
Boptimum reflux ratio
Czero
Dinfinity

Question 149 :
Constant rate period is that drying period during which
Athe rate of vaporization per units of drying surface area is constant

Bthe rate of vaporization continually decreases with time.
Cthe rate of vaporization continually increases with time
Dthe moisture content of the substance remains constant

Question 150 :
Match List I correctly with List II and select your answer using the codes given below :

List I List II

a) Distillation 1. Solvent

b) Absorption 2. Heat

c) Adsorption 3. Absorbent

d) Ion exchange 4. Resin
AA-2, B-1, C-3, D-4

Question 151 :
HETP is numerically equal to HTU only when operating line
Alies below the equilibrium line
Blies above the equilibrium line
Cis parallel to equilibrium lines

Dis far from the equilibrium lines.

Question 152 :
Absorption accompanied by heat evolution results in
Aincreased capacity of the absorber
Bincrease in equilibrium solubility
Cdecrease in equilibrium solubility

Dnone of these

Question 153 :
Humidification involves mass transfer between a pure liquid phase and a fixed gas which is
Ainsoluble in the liquid

Bsoluble in the liquid
Cnon-ideal in nature
Dat a fixed temperature

Question 154 :
The equipment frequently used for adiabatic humidification operation with recirculating liquid is
Anatural draft cooling tower
Binduced draft cooling tower
Cspray chamber

Dnone of these

Question 155 :
Flooding in a column results due to
Ahigh pressure drop

Blow pressure drop
Clow velocity of the liquid
Dhigh velocity of the liquid

Question 156 :
If the selectivity of the solvent used in liquid-liquid extraction is unity
Aany degree of separation of solute is possible
Bonly little amount of solute may be seperated
Cno separation is possible

Dnone of these

Question 157 :
The most economical range of absorption factor is
A0 to 0.5
B0 to 3
C1.25 to 2

D5 to 15

Question 158 :

Match List I correctly with List II and select your answer using the codes given below :

List I	List II
a) Underwood's equation	1. Number of real trays
b) Fenske's equation	2. Column diameter
c) Gilliland's equation	3. Minimum number of ideal trays
d) Vapour velocity at flooding	4. Actual number of ideal trays
	5. Actual number of ideal trays
	6. Tray efficiency

DA-5, B-3, C-4, D-2

Question 159 :
The rate of drying during constant-rate period
Ais unaffected by the air humidity
Bincreases with increased air humidity
Cdecreases with increased air humidity

Dincreases linearly with increase in air humidity

Question 160 :
The expansion of term "HAZOP" is
AHazard operation
BHazard operability studies

CHazard zone
DNone of these

Question 161 :
Which is not a chemical coagulant
AAluminium sulphate
BFerrous sulphate
CHydrated lime
DNone of these

Question 162 :
Match List I relating health hazards correctly with List II and select your answer using the codes given below :

List I List II

a) Irritant 1. CO₂

b) Asphyxiant 2. Chlorine

c) Lung damage 3. Lead

d) systemic poison 4. Dust
AA-4, B-3, C-2, D-1
BA-2, B-1, C-4, D-3

CA-2, B-4, C-1, D-3
Dnone of these

Question 163 :
Radioactive substances present in the polluted water stream can be removed by
Abiological treatment
Bcoagulation & filtration
Cadsorption in ion-exchange materials
Dall of these

Question 164 :
Fault free analysis is an effective tool to identify
Athe system failure which results in loss

Bthe potential of malfunction of the equipment
Cthe areas of concentration of loss producing events
Dnone of these

Question 165 :
Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the
Aultimate stress to breaking stress
Bultimate stress to working stress

Cworking stress to ultimate stress
Dnone of these

Question 166 :
Chemical foam extinguishers are applicable only for
Asolid fire
Bliquid fire

Cgaseous fire
Dall of these

Question 167 :
Factor of safety or overdesign factor in heat transfer equipment is about ........... per cent more than the actual theoretical design factor.
A15-20

Question 168 :
Both liquid fire and gaseous fire can be extinguished by
Awater gas extinguishers
Bmechanical foam extinguishers
Ccarbon dioxide extinguishers

Dall of these

Question 169 :
In water chemical treatment plant, use of chloramines ensures
Adisinfection

Btaste and odour control
Cweed control in reservoirs
Dremoval of permanent hardness

Question 170 :
Which of the following is the most lethal water pollutant
APhenol and cyanide.

BChlorine
CAlkalis
DSuspended solids.

Question 171 :
Freshwater carrying pipelines in chemical industries are coloured with
Agreen

Question 172 :
Which of the following processes is involved in the biochemical treatment of sewage effluents
AOxidation

BReduction
CDehydration
DHydrogenation

Question 173 :
Accidents in chemical plants are mostly due to
Afaulty operating procedures
Bimproper layout of the equipment
Cfailure of equipment

Dinadequate equipment design

Question 174 :
Which one of the following is not a main industrial heat source
AElectricity
BSmoking
CChemical action
DNone of these

Question 175 :
Which of the following is not a natural source of air pollution
AVolcanic cruption and lightning discharges
BBiological decay of vegetable matter
CPhotochemical oxidation of organic matter
DNone of these

Question 176 :
Radioactive solid nuclear wastes are disposed off by
Ahigh temperature incineration
Bpathological incineration
Cpyrolysis
Dunderground burial in concrete containers.

Question 177 :
Carbon monoxide is pollutant, which causes
Arespiratory disease
Basphyxiation leading to death

Cretardation in crop growth
Ddamage to building materials

Question 178 :
Four major constituents of atmospheric air are
1. N²
2. Ar
3. O²
4. CO²
^{Arrange them in ascending order of their % in air :}
AIV,II,III,I

Question 179 :
The total capital investment for a chemical process plant comprises the fixed capital investment and the
Acoverhead cost
Bworking capital

Cindirect production cost
Ddirect production cost

Question 180 :
In a manufacturing industry, break-even point occurs when
Athe total annual rate of production equals the assigned value
Bthe total annual product cost equals the total annual sales

Cthe annual profit equals the expected value
Dthe annual sales equals the fixed cost

Question 181 :

Match List I correctly with List II and select your answer using the codes given below :

List I	List II
a) Capitalized cost	1. Comparing alternative investment choices
b) Unamortized value	2. Updating cost data of equipment
c) Pay-out period	3. Profitability evaluation
d) Cost index	4. Cost accounting
	5. Replacement decisions
	6. Working capital

AA-3, B-6, C-1, D-2

Question 182 :
An investment of Rs. 1000 is carrying an interest of 10% compounded quarterly. The value of the investment at the end of five years will be
A1000 [1+0.1/4]²⁰

B1000(1+0.10)²⁰
C1000 [1+0.1/4]⁵
D1000 [1+0.1/2]⁵

Question 183 :
P is the investment made on an equipment, S is its salvage value and n is the life of the equipment in years. The depreciation for the m^th year by the sum-of-year-digit method will be
AP-S/n
B1-[P/S]^m
Cm/n(P-S)
D2(n-m+1)/n(n+1) (P-S)

Question 184 :

Match List I (Terminology used in plant economics) correctly with List II (Factor) and select your answer using the codes given below :

List I	List II
a) Lang factor for a chemical plant	1. Ratio of gross annual sales to the fixed capital investment.
b) Depreciation	2. Ratio of capital investment to the delivered cost of major equipment.
c) Break-even point	3. It figures in the calculation of income tax liability on cash flows from an investment.
d) Turnover ratio	4. It is the point of intersection of total cost and sales revenue.

AA-2, B-3, C-4, D-1

Question 185 :
Pick out the wrong statement :
ANet worth means paid up share capital and reserve & surplus (i.e. share-holder's equity)
BReturn on equity = profit after tax/net worth
CWorking capital turnover ratio = sales / net working capital
DTotal cost of production is more than net sales realization (NSR) at break-even point.