chemical engineering Mcqs
4601. Which of the following holds good for a solution obeying Raoults law (i.e., an ideal solution) (where, ?H = heat of mixing, and ?V = volume change on mixing) ?
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A. ?H = 1 (+ ve) and ? V = -ve

B. ?H = 0

C. ?V = 0

D. Both B. and C.
4602. Degree to which an instrument indicates the changes in measured variable without dynamic error is called its ___________________?
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A. Speed of response

B. Reproducibility

C. Static characteristics

D. Fidelity
4603. Very low pressure is expressed in microns (?), which is equal to ____________ mm of Hg column (absolute) at 0C?
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A. 0.001

B. 0.01

C. 0.1

D. 0.0001

4604. The evaporation of aqueous solution of sugar causes its molarity to__________________?
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A. Remain unchanged

B. Decrease

C. Either A. or B.; depends on the concentration of the solution

D. Increase

4605. Pick out the wrong statement ?
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A. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons

B. Paramagnetic susceptibility of gases decreases with temperature

C. CO2 is the strongest paramagnetic gas

D. Paramagnetic susceptibility of gases permits the measurement of their concentration

4606. Phase lag of the sinusoidal response of a first order system is _________________?
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A. 120

B. 180

C. 30

D. 90
4607. Which of the following is not a differential pressure flow meter ?
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A. Rotameter

B. Orificemeter

C. Flow nozzle

D. Venturimeter

4608. The osmotic pressure of a solution increases, if its _____________ is decreased?
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A. Volume

B. Solute concentration

C. Temperature

D. None of these
4609. Temperature measuring instruments are standardised mostly with _____________ points of pure substances?
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A. Melting

B. Boiling

C. Both A. & B.

D. Neither A. nor B.

4610. The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since______________?
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A. The Laplace transform of integral of exp(at) has finite values only for s > a

B. The function exp(at) is piece-wise continuous only for s > a

C. The Laplace transform integral of exp(at) has initial values only for s > a

D. The function is exponential

4611. The transfer function for an ideal proportional plus reset controller (reset time T) is_______________?
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A. Kc(1 + TS)

B. Kc/[1 + (s/T)]

C. Kc/(1 + TS)

D. Kc[1 + (1/TS)]
4612. Radiation thermometer cannot measure the temperature ___________________?
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A. Inside a pressure vessel

B. Of an object without coming in contact with it

C. Of liquid oxygen

D. Of moving objects at high temperature

4613. Which of the following is not a composition measuring instrument ?
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A. Mass spectrometer

B. Hot wire anemometer

C. Polarograph

D. Thermal conductivity cell

4614. Hot wire anemometer is used for the measurement of___________________?
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A. Very high temperature

B. Flow rates of granular solids

C. Flow rates of fluids

D. Thermal conductivity of gases

4615. A vapor whose partial pressure is less than its equilibrium vapor pressure is called the _____________ vapor?
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A. Unsaturated

B. Dry gaseous

C. Saturated

D. Superheated
4616. The response of two tanks of same size and resistance in series is __________________?
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A. None of the above

B. Critically damped

C. Under damped

D. Over damped

4617. Emission spectroscopy is used for__________________?
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A. Determination of CO2 in gases

B. Determining water purity

C. NOx determination

D. Solids and metal analysis
4618. The ______________ of a vapor pressure thermometer is a primary element?
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A. Bulb

B. Pointer

C. None of these

D. Bourdon tube

4619. Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by__________________?
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A. All A , B & C.

B. Reducing the volume of the receiving element to a minimum

C. Reducing the volume of the capillary to a minimum

D. Making the volume of thermometer bulb as large as conveniently possible

4620. At 100C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150C is 4.69 atm. At 150C, the vapour pressure of methylcyclohexane would be expected to be_________________?
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A. Indeterminate due to lack of data

B. Significantly more than 4.69 atm

C. Nearly equal to 4.69 atm

D. Significantly less than 4.69 atm

4621. Pick out the wrong unit conversion of heat transfer co-efficient?
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A. 1 BTU/ft2.hr.F = 4.88 kcal/m2.hr.C = 20.44 kJ/m2.hrC = 5.678 W/m2.C

B. 1 W/m2.C = 0.1761 BTU/ft2.hr.F.

C. 1 kcal/m2.hr.K = 1.163 W/m2.C

D. 1 kcal/m2.hr.C = 0.2048 BTU/ft2.hr. F. = 1.163 W/m2.K

4622. Operating range of a temperature measuring instrument is 800 to 1600C. It could be a/an _____________ pyrometer?
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A. Photoelectric

B. Optical

C. None of these

D. Radiation

4623. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the______________________?
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A. Elevation in boiling point in the ratio of their molecular weights

B. Different elevation in boiling point

C. None of these

D. Same elevation in boiling point
4624. Which equation is not an equation of state ?
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A. (P + a/V2)(V-b) = RT

B. p = [RT/(V b)] (a/TV2)

C. PV = RT + B/V + y/V2 + .

D. loge (p/p0) = (?/R) (1/T0 1/T)
4625. The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter D. and shape & number of corrugations. Its deflection is proportional to_______________?
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A. d2

B. d3

C. d4

D. d

4626. A non-linear system will have _____________ steady state values?
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A. Two

B. More than one

C. One

D. Three

4627. Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an ________________?
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A. Magnetic flow meter

B. Orificemeter

C. Hot wire anemometer

D. Venturimeter

4628. The number of atoms of oxygen present in 11.2 litres of ozone (O3) at N.T.P. are__________________?
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A. 6.02 1023

B. 1.20 1024

C. 3.01 1022

D. 9.03 1024
4629. Emf generated in a thermocouple depends on the temperature ___________________?
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A. Difference between cold junction and atmospheric temperature

B. Of hot junction only

C. Of cold junction only

D. Difference between hot and cold junctions
4630. The time constant of a first order process with resistance R and capacitance C is__________________?
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A. RC

B. R + C

C. R C

D. 1/RC

4631. ____________ is the static characteristics of an instrument?
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A. Drift

B. Dynamic error

C. Response

D. Tine lag

4632. Nitrogen gas constant volume thermometer is suitable for measuring a temperature of _____________ C?
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A. 0-100

B. < 0

C. > 100

D. > 50

4633. Which of the following expressions defines the Baume gravity scale for liquids heavier than water ?
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A. 200 (G-1)

B. 145 (145/G)

C. (141.5/G) 131.5

D. (400/G) 400

4634. In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the ____________ variable?
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A. None of these

B. Controlled

C. Load

D. Manipulated

4635. Thermal conductivity cell is the primary element of a/an _____________ analyser?
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A. Carbon dioxide

B. Oxygen

C. Carbon monoxide

D. Sulphur dioxide

4636. The inverse Laplace transform of the function f(S) = 1/S (1 + S) is_________________?
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A. 1 + et

B. 1 + e-t

C. 1 e-t

D. 1 et

4637. E.m.f. generated by thermocouples is of the order of ________________?
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A. Milli volts

B. Volts

C. Micro volts

D. Kilo volts

4638. Thermistors are used in ____________ devices?
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A. Voltage measuring

B. Temperature measuring

C. Temperature compensating

D. Both B. & C.
4639. One Newton is equal to ______________ dynes?
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A. 105

B. 104

C. 103

D. 102

4640. A constant volume gas thermometer employing ______________ is used to measure sub-zero (i.e., < 0C) temperature?
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A. Hydrogen

B. None of these

C. Helium

D. Nitrogen

4641. Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an ?
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A. Solid semi-conductor

B. Conductor

C. Liquid semi-conductor

D. Insulator

4642. Volumetric expansion is the working principle of the ______________ thermometers?
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A. Mercury in glass

B. Vapor pressure

C. Constant volume gas

D. Bimetallic

4643. Liquid flow rate in an open channel cannot be measured by a/an __________________?
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A. Orifice meter

B. Cipolletti weir

C. Rectangular weir

D. V-notch

4644. Use of I-control along with P-control facilitates ?
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A. Reduction of offset

B. Reduction of stability time

C. None of these

D. Elimination of offset
4645. Pirani gauge is used for the measurement of________________?
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A. Very high pressure

B. High vacuum

C. Liquid level under pressure

D. Liquid level at atmospheric pressure

4646. Real gases approach ideal behaviour at___________________?
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A. Low pressure & high temperature

B. High pressure & low temperature

C. High pressure & high temperature

D. Low pressure & low temperature

4647. Flow rate of sludge is not measured by a/an_________________?
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A. Orificemeter

B. Open weir

C. Kennison nozzle

D. Both B. & C.
4648. In the reaction, represented by Na2CO3 + HC1 ? NaHO3 + NaCl, the equivalent weight of Na2CO3 is________________?
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A. 53

B. 106

C. 5.3

D. 10.6

4649. Which of the following thermocouple materials does not contain nickel ?
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A. None of these

B. Constantan

C. Alumel

D. Chromel

4650. Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoults law is proportional to the_____________?
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A. Moles of non-volatile solute

B. Volume of solution

C. Temperature

D. None of these