CUSAT CAT 2018 Question Paper Chemical Enggineering

Subject Code : 603 Section Code : -Select- Difficulty: 1

Subject Answ
Q Id Questions
Code Key

Isotopes are atoms of

(A) the same element with different masses

603 3601 (B) the same element with same masses (A)

(C) different element with same mass

(D) different elements with different masses

different elements with different masses

(A) 44 grams

603 3602 (B) 88 grams (C)

(C) 176 grams

(D) 132 grams

In a test, 20kg of propane was burnt with 400 kg of air to produce 44kg of CO2 and 12 kg CO. What was the percent excess air?

(A) 2.27

603 3603 (B) 28 (B)

(C) 13.79

(D) 2.8

One gram of a sample of crude sulfur is completely burnt in air. The weight of sulfur dioxide formed is 1.5 grams. The purity of
sulfur sample is

(A) 100%
603 3604 (B)
(B) 75%

(C) 50%

(D) 65%

What is percentage carbon in ammonium carbonate, (NH4)2 CO3?

(A) 12.50

603 3605 (B) 6.25 (A)

(C) 25.0

(D) 12.0

A cooking gas cylinder can withstand a pressure of 15 atm. The pressure gauge of the cylinder indicates 12 atm at 27�C.During
a sudden fire in the building the temperature starts rising. At what temperature will the cylinder explode?

(A) 33.75�C
603 3606 (B)
(B) 102�C

(C) 40�C

(D) 240 K

Weight of 56 litres of ammonia at S.T.P. is __________ gram.

(A) 2.5

603 3607 (B) 8600 (C)

(C) 42.5

(D) 4. 56

603 3608 (C)

A gas at 0�C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at
this state will be

(A) -273�C

(B) - 136.5�K

(C) -136.5�C

(D) 0�K

„COX chart‟ is a plot of

(A) Vapor pressure vs temperature

603 3609 (B) Log (vapor pressure) vas log (temperature) (D)

(C) Log (vapor pressure) vs temperature

(D) Log (vapor pressure) vs inverse of temperature

The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. The vapor phase mole fraction of benzene
in equilibrium with a liquid mixture of 0.4 moles of benzene and 0.6 moles of toluene is:

(A) 0.8
603 3610 (B)
(B) 0.6

(C) 0.2

(D) 0.4

The critical point of a substance represents

(A) a point (pressure and temperature) where all three phases of the substance coexist in equilibrium.

603 3611 (B) The lowest pressure and temperature where vapor and liquid phases coexist in equilibrium (D)

(C) A temperature where vapor is transformed into liquid

(D) The highest pressure and temperature where all thermodynamic properties of the liquid and vapor are identical

A gas can always be condensed by

(A) cooling alone

603 3612 (B) compressing alone (C)

(C) cooling below the critical temperature and then compressing

(D) bringing it below triple point

Alkyl benzene sulfonate (ABS) is a

(A) detergent

603 3613 (B) synthetic rubber (A)

(C) plasticizer

(D) an industrial solvent

Poly Tetra Fluro Ethylene (PTFE) is popularly known as

(A) Perspex

603 3614 (B) Bakelite (D)

(C) pidilite

(D) Teflon

603 3615 When small particles are settling in a fluid, at very low Reynolds numbers, the flow is described by (C)

(A) streamline flow

(B) rotational flow

(C) creeping flow

(D) irrotational flow

A solid particle is moving through a fluid and the particle Reynolds number is 0.24; the drag coefficient is

(A) 1

603 3616 (B) 10 (A)

(C) 100

(D) 1000

In fluid flow at low Reynolds numbers

(A) viscous forces are important

603 3617 (B) Inertial forces are important (A)

(C) Buoyancy forces are important

(D) Gravitational forces are important

Two circular pipes have different diameters but same roughness. Water is flowing through pipe 1, having friction factor f1 at a
Reynolds number of 12,000; air is flowing through pipe 2, having friction factor f2 at the same Reynolds of 12,000. Then

(A) f1 > f2
603 3618 (C)
(B) f2 < f1

(C) f1 = f2

(D) f1 and f2 cannot be calculated

For standard steel pipes, for a given NPS, as schedule number increases, wall thickness

(A) increases

603 3619 (B) decreases (A)

(C) remains same

(D) schedule number has nothing to do with wall thickness

The discharge is proportional to square root of the head for

(A) orifice meter

603 3620 (B) V-notch (A)

(C) sutro-weir

(D) rectangular notch

The Fanning friction factor for turbulent flow is a where NRe is Reynolds number and E/D is relative roughness.

(A) function of NRe only

603 3621 (B) function of E/D and Nre (B)

(C) function of E/D only

(D) constant

603 3622 The hydraulic diameter of a duct having the shape of an equilateral triangle with side a is (C)

(A)

(B)

(C)

(D)

When a material is subjected to an increased shear rate, an increase in its apparent viscosity occurs; such a phenomenon is
observed in

(A) dilatants
603 3623 (A)
(B) rheopectics

(C) viscoelastics

(D) thixotropics.

Water is flowing under laminar conditions in a pipe of length L. If the diameter of the pipe is doubled, for a constant volumetric
flow rate, the pressure drop across the pipe

(A) decreases 2 times
603 3624 (B)
(B) decreases 16 times

(C) increases 2 times

(D) increases 16 times

603 3625 (C)

(A) Pseudo plastic fluid

(B) real fluid

(C) Bingham plastic

(D) None of the above

Diaphragm pumps are used to handle

(A) highly viscous liquids

603 3626 (B) liquids to be pumped into high pressure vessels (A)

(C) hazardous or toxic liquids / slurries

(D) liquids having very low vapor pressure

The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at
th

(A) suction
603 3627 (D)
(B) discharge minus vapor pressure of the liquid at the discharge temperature

(C) discharge

(D) suction minus vapor pressure of the liquid at suction temperature

603 3628 Froude number is a ratio of (A)

(A) inertial forces to gravity force

(B) buoyant forces to gravity force

(C) inertial forces to viscous forces

(D) inertial forces to buoyant forces

Cavitation in a centrifugal pump may be avoided by maintaining

(A) a very low suction head

603 3629 (B) a positive suction head (B)

(C) a very low discharge head

(D) the suction and discharge valves properly

Bernoulli‟s theorem deals with the law of conservation of

(A) energy

603 3630 (B) mass (A)

(C) momentum

(D) gravity

The loss of pressure head for the laminar flow through pipes varies as the

(A) square of velocity

603 3631 (B) proportional to the velocity (B)

(C) inverse of the velocity

(D) inverse of the square of the velocity

For hydraulically smooth pipe, the resistance to flow depends only on the

(A) flow Reynolds number

603 3632 (B) relative roughness (A)

(C) absolute roughness

(D) Reynolds number and relative roughness

The discharge co-efficient for a venturimeter is found to be a function of

(A) meter size

603 3633 (B) Reynolds number (C)

(C) Both (A) and (B)

(D) None of the above

Newton‟s Law of viscosity states that the shear stress is directly proportional to the

(A) velocity

603 3634 (B) velocity gradient (B)

(C) square of velocity

(D) square of velocity gradient

Vena contracta is found in

(A) Rotameter

603 3635 (B) orificemeter (B)

(C) bourdon tube pressure gauge

(D) wet gas flow meter

603 3636 The unit of kinematic viscosity is (C)

(A) m2/s

(B) Stoke

(C) either (a) or (b)

(D) poise

Flow of incompressible fluid with no shear is called

(A) creep flow

603 3637 (B) stream line flow (C)

(C) potential flow

(D) boundary layer flow

For precise control of fluid flow rate the best performance is obtained by

(A) gate valve

603 3638 (B) check valve (C)

(C) globe valve

(D) None of the above

Compared to gate valve pressure drop is --------------- in globe valve.

(A) less

603 3639 (B) more (B)

(C) same

(D) unpredictable

Turbulent velocity profile becomes flatter and flatter with -----------

(A) decreasing Reynolds number

603 3640 (B) increasing Reynolds number (B)

(C) at a given Reynolds number

(D) None of the above

In turbulent flow, mean velocity in a circular pipe is approximately equal to

(A) 0.8 to 0.82 of maximum velocity

603 3641 (B) 0.9 to 0.95 of maximum velocity (A)

(C) 0.5 of maximum velocity

(D) 0.6 to 0.65 of maximum velocity

For closer sizing of solid particles, intermediate screens are available in Tyler standard screen series; the ratio of the actual mesh
dimension of any screen in intermediate range to that of the next smaller screen is

(A) 1.414
603 3642 (A)
(B) 0.707

(C) 1.189

(D) 0.841

603 3643 Kynch theory is used in the design of (D)

(A) classifiers

(B) centrifugal separators

(C) filters

(D) clarifiers

For settling in the stokes range the value of Reynolds number is

(A) 2
603 3644 (D)
(B) 200
(C) 500
(D) 0

LMTD correction factor is used in the design of

(A) double pipe heat exchangers

603 3645 (B) shell and tube condensers (D)

(C) single pass shell and tube heat exchangers

(D) multipass shell and tube heat exchangers

Which has the lowest Prandtl number?

(A) organic liquids

603 3646 (B) inorganic liquids (C)

(C) liquid metals

(D) gases

Heat exchangers which are especially useful with food products and similar heat- sensitive materials are

(A) extended-surface exchangers

603 3647 (B) plate exchangers (C)

(C) scraped-surface exchangers

(D) double-pipe exchangers

The mode of heat transfer in microwave ovens used for baking food is

(A) conduction

603 3648 (B) convection (C)

(C) radiation

(D) combined convection and conduction

The maximum heat loss from a heated pipe occurs when the thickness of thermal insulation is -----------

(A) less than critical radius

603 3649 (B) equal to critical radius (B)

(C) more than critical radius

(D) both (b) and �

In a cooling tower water is cooled from 95 � C to 80 � C by exposure to air with a wet bulb temperature of 70 � C.The
approach would be

(A) 15 � C
603 3650 (B)
(B) 10 � C

(C) 25 � C

(D) None of the above

603 3651 In a heat exchanger with steam outside the tubes, a liquid gets heated to 45�C, when its flow velocity in the tubes is 2 m/s. If (D)
the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

(A) equal to 45�C

(B) initially decreases and remains constant thereafter

(C) less than 45�C

(D) more than 45�C

Name the process in which heat transfer is undesirable and its flow is to be prevented

(A) gas turbine blades

603 3652 (B) Wall of steam pipes (B)

(C) wall of internal combustion chamber

(D) outer space vehicles

Name the method by which heat transfer takes place due to direct molecular communication without any appreciable
displacement of the system

(A) forced convection
603 3653 (C)
(B) Natural convection

(C) conduction

(D) radiation

The thermal conductivity of perfect heat insulator is

(A) Zero

603 3654 (B) One (A)

(C) between 0 and infinity

(D) infinity

If the pipe radius ( r ) is less than critical radius (rc), the heat loss from pipe

(A) decreases with the addition of insulation until r = rc

603 3655 (B) increases with the addition of insulation until r = rc (B)

(C) increases with the addition of insulation

(D) decreases with the addition of insulation

All substances emit energy in the form of radiation continuously at a temperature of

(A) above absolute zero temperature

603 3656 (B) above 0oC (A)

(C) above 100oC

(D) above its decomposition temperature

2-4 shell and tube heat exchanger means

(A) 2 shell side pass and 4 tube side pass

603 3657 (B) 4 shell side pass and 2 tube side pass (A)

(C) 2 shell side pass and 2 tube side pass

(D) 4 shell side pass and 4 tube side pass

Mass dispersion may be characterized by the dimensionless group

(A) Sherwood number

603 3658 (B) Peclet number (A)

(C) Fourier number

(D) Froude number

603 3659 In general the diffusivity DAB in a liquid varies with temperature as (B)

(A) T1.5

(B) T

(C) 1/T

(D) T1.75

J flux is the molar flux with reference to

(A) Moving frame of reference

603 3660 (B) Fixed frame of reference (A)

(C) None of the above

(D) May be a) or b)

603 3661 (A) -2 (A)
(B) -0.5

(C) 2

(D) 0.5

Knudsen diffusion occurs when the ratio of pore diameter to mean free path of molecules is

(A) less than 0.20

603 3662 (B) greater than 0.20 (A)

(C) less than 2.0

(D) greater than 2.0

For structure dependent diffusion in a solid the ratio of Effective diffusivity to Binary diffusivity

(A) varies and depends on temperature

603 3663 (B) varies and depends on pressure (D)

(C) varies and depends on component diffusing

(D) remains constant and depends on pore geometry

For the boundary layer development on a flat plate during convective mass transport, the velocity profile will be identical to
concentration profile, when Schmidt number is equal to

(A) 0
603 3664 (B)
(B) 1

(C) between 0 and 1

(D) more than 1

Distillation can be used for the separation of components from a liquid mixture only if the operating temperature is

(A) above the dew point temperature

603 3665 (B) below the bubble point temperature (C)

(C) between the bubble point and dew point temperature

(D) All of the above

In a binary mixture, separation is very efficient when the relative volatility is

(A) 0

603 3666 (B) 1 (D)

(C) between 0 and 1

(D) more than 1

603 3667 An azeotropic solution of two liquids has boiling point lower than either of them, when it (C)

(A) is unsaturated

(B) is saturated

(C) shows negative deviation from Raoult's law.

(D) shows positive deviation from Raoult's law

If the feed to distillation column is a subcooled liquid , then q line is

(A) Vertical

603 3668 (B) horizontal (C)

(C) line with a positive slope

(D) line with a negative slope

In a binary mixture ,separation is very efficient when the relative volatility is

(A) 0

603 3669 (B) 1 (C)

(C) more than 1

(D) between 0 and 1

The feed to a distillation column is changed from saturated liquid to saturated vapour. If the separation and reflux ratio remains
unchanged ,the number of ideal stages will

(A) increase
603 3670 (A)
(B) decrease

(C) remain constant

(D) cannot say

The washing of ammonia from a mixture of ammonia and air by means of liquid water is an example of

(A) gas absorption

603 3671 (B) gas adsorption (A)

(C) gas desorption

(D) gas stripping

In case of a gas absorber

(A) equilibrium curve lies below the operating line

603 3672 (B) equilibrium curve lies above the operating line (A)

(C) equilibrium curve lies above or below the operating line

(D) None of the above

In an azeotropic mixture the equilibrium liquid composition is

(A) more than vapour composition

603 3673 (B) same as vapour composition (B)

(C) less than vapour composition

(D) independent of pressure

Down comer flooding occurs in plate columns at

(A) low gas and liquid rates

603 3674 (B) high gas and low liquid rates (C)

(C) high gas and liquid rates

(D) low gas and high liquid rates

603 3675 In the design and operation of packed towers the operating velocity is ---- percentage of flooding velocity (A)

(A) 70 and 85

(B) 85 and 95

(C) 50 and 60

(D) 60 and 65

In the design of towers used for mass transfer operations, the tower diameter is computed based on the considerations of

(A) mass transfer

603 3676 (B) pressure drop (C)

(C) flooding

(D) ratio of flow rates of phases

Improved gas absorption can be achieved by carrying out the process at

(A) low temperature and high pressure

603 3677 (B) high temperature and low pressure (A)

(C) high temperature and high pressure

(D) low temperature and low pressure

A column is designed to operate at a reflux ratio of 1.3 (saturated reflux).In actual operation the reflux is well below its bubble
point. What reflux ratio would you suggest qualitatively?

(A) R>1.3
603 3678 (B)
(B) R<1.3

(C) 1.3

(D) R=0

When a packed tower is operated close to flooding condition, we will have

(A) more pressure drop and higher mass transfer

603 3679 (B) more pressure drop and lower mass transfer (B)

(C) lower pressure drop and higher mass transfer

(D) lower pressure drop and lower mass transfer

For distillation of heat sensitive materials

(A) Atmospheric pressure is preferred

603 3680 (B) pressures above atmospheric pressure are preferred (C)

(C) vacuum conditions are preferred

(D) pressure has no effect

In a gas –liquid mass transfer operation if the gas side film mass transfer coefficient is much higher than the liquid side mass
transfer coefficient, then the rate of mass transfer

(A) is gas film controlled
603 3681 (B)
(B) is liquid film controlled

(C) can be enhanced by increasing the turbulence in the gas phase

(D) can be enhanced by decreasing the gas film thickness

Freundlich isotherm relates

(A) mass of solute adsorbed per unit mass of adsorbent with the concentration of solute in the liquid phase at equilibrium

603 3682 (B) Equilibrium compositions in gas and liquid phase (A)

(C) Liquid –liquid equilibrium relationship

(D) None of the above

For multistage cross-current adsorption operation, the stage operating lines lie

(A) above the equilibrium curve with positive slopes

603 3683 (B) above the equilibrium curve with negative slopes (C)

(C) below the equilibrium curve with negative slopes

(D) below the equilibrium curve with positive slopes

Flash distillation is suitable for separation of components

(A) which form an azeotrope

603 3684 (B) having very close boiling points (C)

(C) having very wide boiling points

(D) one of which having a very high boiling point and other an impurity

When a liquid is converted to vapour , entropy

(A) Becomes zero

603 3685 (B) decreases (C)

(C) increases

(D) remains the same

The activity of ith species in a homogeneous solution (ai) can be defined as

(A)

(B)

603 3686 (B)
(C)

(D)

A polytropic process PVn = constant for which n is infinity is a

(A) constant pressure process

603 3687 (B) constant volume process (B)

(C) constant temperature process

(D) reversible adiabatic process

Find the change in internal energy when 50 g of air is heated from 25�C to 27�C. The specific heat at constant volume is
0.184 cal/g/�C

(A) 0.184 cal
603 3688 (C)
(B) 184 cal

(C) 18.4cal

(D) None of these

603 3689 An adiabatic system can exchange energy with its surroundings (A)

(A) only in the form of work

(B) either in the form of heat or work

(C) in the form only heat

(D) both in the form of heat and work

For a reversible adiabatic change, the change in entropy of the system is

(A) Zero

603 3690 (B) positive (A)

(C) negative

(D) None of the above

At 60� C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of
methanol at 60� C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686
and 0.5714 respectively. Activity co-efficient of methanol is

(A) 1.572
603 3691 (A)
(B) 1.9398

(C) 3.389

(D) 4.238

In case of __________ process, the temperature of the system increases.

(A) Adiabatic compression

603 3692 (B) isothermal compression (A)

(C) isothermal expansion

(D) adiabatic expansion

You turn off water flowing into the tube and open the drain. This is an example of

(A) an open steady-state system

603 3693 (B) an open unsteady-state system (B)

(C) closed system

(D) None of the above

Which of the following is an extensive property?

(A) Temperature

603 3694 (B) Pressure (C)

(C) Volume

(D) Density

Reactions which are very temperature – sensitive are the

(A) reactions with high activation energies

603 3695 (B) reactions with low activation energies (B)

(C) reversible reactions

(D) irreversible reactions

Addition of inert gas in a reversible chemical reaction favors the forward reaction when

(A) Δn=0

603 3696 (B) Δn>0 (B)

(C) Δn<0

(D) Any of the above

603 3697 The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero (C)
order reaction is

(A) ∞

(B) >1

(C) 1

(D) 0

When a zero-order reaction is carried out in a batch reactor, the time needed for the reactant concentration to become zero is
where CAO is the initial concentration of reactant A and K is the reaction velocity constant.

(A)

(B)

603 3698 (C)

(C)

(D)

When the order of a reaction is greater than unity, as the initial concentration of reactant increases the half – life of the reaction

(A) Remains same

603 3699 (B) decreases (B)

(C) increases

(D) increases and then decreases

Auto catalytic reactions occur with

(A) the catalyst as one of the reactants

603 3700 (B) with one of the reaction products acting as a catalyst (B)

(C) temperature continuously increasing or decreasing

(D) biocatalysts

increases 1.414 times as the reactant concentration is doubled. What could be the order of reaction?

(A) 0.5

603 3701 (B) 1.0 (A)

(C) 1.5

(D) 2.0

When a reversible reaction is carried out in the presence of a catalyst

(A) The speed of forward reaction is increased and that of backward reaction is decreased.

603 3702 (B) The speed of forward reaction is increased to a larger extent than that of backward reaction. (D)

(C) The speed of backward reaction is increased and that of forward reaction is decreased.

(D) The speeds of both forward and backward reactions are increased to the same extent.

A zero-order reaction is carried out in an ideal PFR and MFR having equal volumes and operating under identical conditions.
The ratio of conversions K1KCAO2KCAOK693.0 13 achieved in PFR to MFR will be

(A) <1
603 3703 (B)
(B) 1

(C) >1

(D) 2

603 3704 When complete back-mixing prevails in a flow vessel, the vessel dispersion number will be (B)

(A) zero

(B) infinity

(C) less than unity

(D) greater than unity

603 3705 (A) high pressure and high temperature (B)
(B) low pressure and high temperature

(C) high pressure and low temperature

(D) low pressure and low temperature

A pulse of tracer is injected into the inflow of a tubular flow system in which ideal plug flow prevails; the response appears at a
time equals to where τ is the space time.

(A)

(B)
603 3706 (B)

(C)

(D)

When a reaction occurs between gas and liquid phases (reaction is very fast) and gas is sparingly soluble in liquid, it is likely
that the global process is controlled by

(A) mass transfer through gas film
603 3707 (B)
(B) mass transfer through liquid film

(C) chemical reaction

(D) mass transfer and chemical reaction

For a porous catalyst particle “effectiveness factor” may be need as a measure to find whether the

(A) catalyst formulation is good for a given reaction

603 3708 (B) reaction rate is lowered because of pore diffusional resistance (B)

(C) reaction is surface reaction – controlled

(D) reaction is adsorption / desorption – controlled

The problem of hot spots may occur in

(A) trickle bed reactors

603 3709 (B) packed bed reactors (B)

(C) fluidized bed reactors

(D) moving bed reactors

603 3710 The problem of “off-set” usually occurs with (C)

(A) derivative control

(B) integral control

(C) proportional control

(D) PI control

An open tank is discharging water to the open atmosphere through a valve; the discharge (volumetric flow rate) is proportional
to head available in the tank. The ratio of time constant of the system to hold up time is

(A) 0.5
603 3711 (B)
(B) 1.0

(C) 1.5

(D) 2.0

For an under damped system, the damping coefficient is

(A) zero

603 3712 (B) less than unity (B)

(C) unity

(D) greater than unity

A typical U-tube manometer filled with mercury or water would be

(A) an under damped system

603 3713 (B) a over damped system (A)

(C) a critically damped system

(D) a first-order system

In the response of a first-order system to sinusoidal inputs, at higher frequencies the phase-lag approaches a limit of

(A) –90o

603 3714 (B) –45o (A)

(C) –30o

(D) –60o

The resistance of a first order system is

(A) driving force/ flow

603 3715 (B) storage/driving force (A)

(C) flow/ driving force

(D) None of the above

Time constant of mercury in glass thermometer (without covering or air gap) is equal to Where m is mass of mercury in tube Cp
is the heat capacity of mercury, h is the film coefficient of heat transfer, A is the surface area of bulb for heat transfer.

(A)

(B)

603 3716 (A)

(C)

(D)

603 3717 If two tanks each with time constant τ are connected in interacting manner , the transfer function relating the outlet flow (Q2) to (C)

the inlet flow (Q) to this two tank system is

(A)

(B)

(C)

(D)

603 3718 (A) Under damped (C)

(B) oscillatory

(C) over damped

(D) critically damped

A proportional controller is used to control temperature within the range of 60 to 100 �C. The controller is adjusted so that the
output pressure goes from 3 kg/cm2(valve fully open) to 15 kg/cm2 (valve fully closed) as measured temperature goes from 71
to 75�C with the set point held constant. Now the value of gain and proportional band is

(A) 3 kg/cm2/ �C and 5% respectively
603 3719 (B)
(B) 3 kg/cm2/ �C and 10% respectively

(C) 5 kg/cm2/ �C and 10% respectively

(D) 10 kg/cm2/ �C and 3% respectively

At the corner frequency, the amplitude ratio for the sinusoidal response of a first order system is

(A)

(B)

603 3720 (A)
(C)

(D)

603 3721 In a chemical reactor, following a change in the inlet concentration of the reactant outlet concentration tends to change. The (C)
outlet concentration of the reactant is to be controlled. This control problem is called as

(A) Servo control

(B) on-off control

(C) regulator control

(D) inherent control

Routh test for stability of control systems uses

(A) open-loop transfer function

603 3722 (B) closed loop transfer function (C)

(C) characteristic equation

(D) None of the above

Iron sheets and pipes are usually galvanized for protection; the metal used in this process is

(A) nickel

603 3723 (B) chromium (C)

(C) zinc

(D) molybdenum

Which one of the following heads is preferred for high pressure vessels?

(A) Torispherical

603 3724 (B) Ellipsoidal (C)

(C) Hemispherical

(D) Flat plate

Skirt supports are particularly suitable for use with

(A) long horizontal vessels

603 3725 (B) small vertical vessels (C)

(C) tall vertical vessels

(D) short horizontal vessels

The major constituent of natural gas is

(A) methane

603 3726 (B) carbon dioxide (A)

(C) oxygen

(D) nitrogen

The fire of electrical equipments can be extinguished with the use of

(A) soda-acid extinguisher

603 3727 (B) carbon dioxide extinguisher (B)

(C) foam extinguisher

(D) antifreeze extinguisher

Point velocity in a pipeline is measured by

(A) Pitot tube

603 3728 (B) Pressure gauge (A)

(C) Venturi meter

(D) Orifice meter

603 3729 Laplace Transform of f(t)=e-3t is (A)

(A)

(B)

(C)

(D)

(A)

603 3730 (B) (B)

(C)

(D)

603 3731 The Newton Raphson method for finding the square root of a real number R in the equation x2-R=0 (C)

(A)

(B)

(C)

(D)

(A)

603 3732 (B) (B)

(C)

(D)

A partial differential equation has

(A) one independent variable

603 3733 (B) two or more independent variables (B)

(C) more than one dependent variable

(D) equal number of dependent and independent variables

603 3734 (A)

(A) elliptic

(B) parabolic

(C) hyperbolic

(D) None of the above

Urea is produced from

(A) Ammonia and CO2

603 3735 (B) N2 and CO2 (A)

(C) Methane and CO

(D) Natural gas

603 3736 In Kraft pulping, fibrous material is cooked in the solution of (B)

(A) Sodium hydroxide and sodium carbonate

(B) Sodium hydroxide and sodium sulphate

(C) Sodium carbonate and sodium sulphate

(D) None of the above

The equilibrium conversion of SO2 to SO3 in a reversible reaction can be increased by ---------

(A) If some amount of SO3 is removed during intermediate stage

603 3737 (B) If some amount of SO3 is added during intermediate stage (A)

(C) By putting more amount of catalyst

(D) None of the above

Ammonia synthesis gas is produced from natural gas by

(A) Partial oxidation

603 3738 (B) thermal cracking (D)

(C) hydrogenation

(D) steam reforming

10% Oleum means

(A) 10kg SO3 and 90 kg H2SO4

603 3739 (B) 10kg H2SO4 and 90 kg SO3 (A)

(C) 10kg SO3 and 90 kg H2SO4

(D) 10kg H2SO4 and 90 kg SO2

The raw materials required in the manufacture of soda ash by Solvay Process are

(A) Common salt, lime stone and coke

603 3740 (B) Glauber‟s salt,lime stone and coke (A)

(C) Common salt,sulphuric acid and lime stone

(D) Glauber‟s salt, nitric acid and lime stone

Nylon 6 is manufactured from

(A) Caprolactum

603 3741 (B) w- amino undeconic acid (A)

(C) hexamethylene diamine and adipic acid

(D) Phenol

A dissolved solute is to be removed from a solution by stripping with a gas in a packed tower . The height of the packing
(Raschig rings) is estimated to be h under a given set of temperature conditions. Which of the following changes in the operating
conditions may be done in order to reduce the packing height without reducing the degree of separation.(i) Increasing the
operating pressure (ii) decrease the operating temperature and rate of flow of stripping gas (iii) increase the temperature and
decrease the pressure (iv) Use saddle packing rather than rings (v) increase the stripping gas rate (vi) add a suitable reagent to
solvent that reacts with the dissolved solute
603 3742 (C)
(A) (i), (ii) (vi)

(B) (ii)

(C) (iii), (iv),(v)

(D) (vi)

Which of the following packings offer lowest pressure drop?

(A) Plastic Raschig ring

603 3743 (B) Metal Pall ring (B)

(C) Ceramic intalox saddle

(D) Plastic intalox saddle

603 3744 An orifice type liquid distributer in a packed bed has been installed. But it is tilted. Which of the following problems may occur (C)
as a result?

(A) Blockage of gas flow through the bed

(B) Flooding

(C) channelling of liquid

(D) All of the above

For a given fluid as the pipe diameter increases, the pumping cost

(A) increases

603 3745 (B) remains same (D)

(C) may increase or decrease depending upon whether the fluid is Newtonian or non- Newtonian

(D) decreases

In which of the electric power generation systems , the operating cost is the minimum?

(A) Hydroelectric

603 3746 (B) Thermal (A)

(C) Nuclear

(D) Fast breeder reactor

Which one of the following is a wrong statement with respect to the distillation column?

(A) Operating cost increases if reflux ratio increases

603 3747 (B) Large reflux ratio demands higher heat duty (D)

(C) As the reflux ratio increases , the number plates required decreases

(D) As the reflux ratio increases condenser cooling load decreases

The quantity of CO2 in atmosphere is increased by

(A) vegetation

603 3748 (B) green house effect (B)

(C) high winds

(D) forests

BOD and COD are the parameters used to assess the quality of

(A) Waste water

603 3749 (B) drinking water (A)

(C) fertilizer

(D) pesticides

Activated sludge process utilizes ----------- for the treatment of wastewater

(A) Activated carbon

603 3750 (B) sodium sulphite (D)

(C) Fenton reagent

(D) microorganisms