chemical engineering Mcqs
4551. The heat of adsorption of a gas caused by Van der Waals forces of attraction and capillarity is equal to the heat of__________________?
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A. Difference of A. and B.

B. Sum of A. and B.

C. Normal condensation

D. Wetting

4552. ______________ controller has the maximum stabilising time?
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A. P

B. PI

C. PD

D. PID

4553. Strain gage pressure transducers are used to measure _____________ pressures?
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A. Gage as well as vacuum

B. Absolute as well as differential

C. Both A. and B.

D. Neither A. nor B.

4554. Kopps rule is concerned with the calculation of__________________?
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A. Heat capacity

B. Viscosity

C. Surface tension

D. Thermal conductivity

4555. Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( 0.1s)/(0.5s + 1) are known with a possible error of 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as________________?
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A. 12, 0.6, 0.12

B. 12, 0.4, 0.08

C. 8, 0.6, 0.12

D. 8, 0.6, 0.08

4556. On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes_________________?
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A. 1

B. 8

C. 4

D. 2

4557. ____________ stability method uses open loop transfer function?
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A. Mikhailov

B. Ruth

C. Nyquist

D. None of these

4558. Which of the following does not figure in the list of seven substances selected for international temperature scale ?
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A. Ice (F.P) and steam (B.P)

B. Oxygen and sulphur (B.P)

C. Zinc (B.P) and mercury (F.P)

D. Antimony and silver (F.P)

4559. The amplitude ratio for the sinusoidal response of __________ is < 1?
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A. First order system

B. Second order system

C. Transportation lag

D. None of these

4560. Composition of alloys can be determined by _________________?
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A. Refractometer

B. None of these

C. Polarograph

D. Chromatograph

4561. Compositional analysis of ______________ is done using mass spectrometer?
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A. A solid

B. An alloy

C. An isotope

D. Natural gas

4562. Flow rate of a river is measured by a/an____________________?
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A. Kennison nozzle

B. Vane meter

C. Pitot tube

D. Open weir

4563. What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100C, if their vapor pressures at 100C are 1340, 560 and 210 mmHg respectively ?
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A. 880.5

B. 801.5

C. 756.2

D. 780.5

4564. Avogadro number is the number of molecules in one ____________ of a gas?
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A. Kilogram

B. gram

C. Litre

D. gm.mole
4565. 1 kg/cm2 is equal to________________?
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A. 1 metre of water column

B. 10 metres of water column

C. 1 KPa

D. 760 torr

4566. The boiling points for pure water and pure toluene are 100C and 110.6C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. The temperature at which the above mixture will exert a pressure of one standard atm. is___________________?
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A. 110.6C

B. Between 100 and 110C

C. Less than 100C

D. 100C

4567. The unit of time constant of a system is the same as that of___________________?
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A. None of these

B. Time

C. Velocity

D. (Time)-1

4568. Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion ?
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A. Invar

B. Nickel

C. Brass

D. Chromel

4569. Positioning controllers are used for _______________?
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A. Temperature changes

B. Low loads

C. Flow rate changes

D. High loads
4570. For estimation of heat capacity of a solid compound, one can use________________?
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A. Troutons rule

B. Clapeyrons equation

C. Kopps rule

D. Gibbs equation

4571. Nichols chart deals with __________________?
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A. A.R. vs. phase lag of first order

B. A.R. vs. phase lag of second order

C. Frequency response values of controllers

D. Closed loop values vs. open loop values
4572. 1 ata is equivalent to_________________?
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A. 1 atm

B. 10 torr

C. 0.98 Pascal

D. 1 kgf/cm2
4573. A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if________________?
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A. Kc is increased

B. Kc is reduced

C. Derivative control action is introduced

D. Integral control action is introduced

4574. The ____________ of a vapor pressure thermometer is a secondary element ?
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A. Bourdon tube

B. None of these

C. Bulb

D. Pointer

4575. Number of gram equivalent of solute dissolved in one litre of solution is called its___________________?
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A. Formality

B. Molality

C. Normally

D. Molarity

4576. To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with ________________?
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A. Oil

B. Mercury

C. Air

D. A metal powder or graphite

4577. The unit step response of the transfer function (2s 1)/[(3s + 1) (4s + 1)] reaches its final steady state asymptotically after _____________?
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A. Increasing decreasing and then increasing

B. A monotonic increase

C. Initially increasing and then decreasing

D. A monotonic decrease

4578. What is the dynamic error in a critically damped second order instrument for a ramp input (At) ?
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A. 2 AT

B. ?(AT)

C. 0.5 AT

D. 1.5 AT

4579. _____________ kg of CaC03 on heating will give 56 kg of CaO?
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A. 1000

B. 56

C. 144

D. 100
4580. An amplitude ratio of 0.1 corresponds to _____________ decibels?
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A. 20

B. -20

C. -10

D. 10

4581. One kg of saturated steam at 100C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98C; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m3. The latent heat of condensation (kJ/kg-1 ) under these conditions is___________________?
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A. 540

B. 2263

C. 40732

D. 2676

4582. Which of the following thermometers is not suitable for distant reading upto 60 metres ?
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A. Constant volume gas thermometer

B. Resistance thermometer

C. Mercury in glass thermometer

D. Vapor pressure thermometer

4583. Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1) ?
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A. w = ?(7/8), Kc = 45/4

B. w = 1/?14, Kc = 45/7 ?14

C. w = ?(7/6), Kc = 46/3

D. w = 1, Kc = 13

4584. Which of the following is a contact pyrometer ?
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A. Radiation pyrometer

B. Infra red pyrometer

C. Optical pyrometer

D. Resistance pyrometer
4585. In a single tank system, the transfer function of _____________ to inlet flow rate is 1/(TS+1)?
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A. Outlet flow rate

B. Level

C. Both A. & B.

D. Neither A. nor B.

4586. A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same_________________?
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A. Temperature measuring range (- 40C to 450C)

B. All a, b & c

C. Accuracy ( 1% of span)

D. Speed of response

4587. The temperature of tempering oil baths maintained at 400C during heat treatment of steel is measured by a/an _____________ thermocouple?
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A. Chromel-alumel

B. None of these

C. Iron-constantan

D. Platinum-platinum/rhodium

4588. The _____________ of a vapor pressure thermometer is a functioning element?
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A. Bulb

B. Bourdon tube

C. None of these

D. Pointer
4589. Working principle of disappearing filament type optical pyrometer is based on the ________________?
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A. Seebeck effect

B. Wiens law

C. Peltier effect

D. Kirchoffs law

4590. Continuous measurement of moisture in paper is done by_______________?
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A. High resistance Wheatstone bridge circuit

B. Sling psychrometer

C. Weighing

D. Hair-hygrometer

4591. Cp equals Cv at________________?
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A. 0C

B. 0F

C. 0K

D. 0R

4592. The pressure of V litres of a dry gas is increased from 1 to 2 kgf/cm2 at a constant temperature. The new volume will become___________________?
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A. 2V

B. V/2

C. V/4

D. V2

4593. Identify an unbounded input from inputs whose transfer functions are given below______________?
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A. 1/S2

B. 1

C. 1/(S2 + 1)

D. 1/S

4594. Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume X diffuses twice as fast as another perfume Y; what is the molecular weight of Y, if the vapor density of gas X is 2? Molecular weight of gas X is to be assumed to be 2 ?
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A. 16

B. 2

C. 4

D. 8

4595. Mercury thermometer can be used to measure the temperature upto ____________ C?
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A. 250

B. 750

C. 100

D. 350
4596. The elevation in boiling point of a solution is proportional to the ______________ of the solution?
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A. Normality

B. Reciprocal of the molal concentration

C. Molarity

D. Molal concentration
4597. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change ?
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A. Methyl alcohol

B. Carbon-tetrachloride

C. Water

D. Mercury
4598. Temperature measurement by optical pyrometer is done above ____________ point, which is 1063C ?
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A. Nickel

B. Antimony

C. Silver

D. Gold
4599. The heat change for the reaction, C(s) + 2S(s) ? CS2(l), is 104.2 kJ. It represents the heat of_________________?
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A. Formation

B. Combustion

C. Fusion

D. Solution

4600. A barometer measures the _____________ pressure?
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A. Absolute

B. dynamic

C. Absolute as well as gauge

D. Gauge