chemical engineering Mcqs
4501. At higher temperature, molal heat capacities of most of the gases (at constant pressure) ____________ with increase in temperature?
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A. Remains unchanged

B. Decreases

C. Increases

D. Increases linearly

4502. The value of Troutons ratio (?b/Tb) for a number of substances is 21 (where, ?b = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, K). The Kistyakowsky equation is used for calculation of Troutons ratio of _____________ liquids?
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A. Polar

B. Non-polar

C. Both A. & B.

D. Neither A. nor B.

4503. The vapour pressure of a solution (made by dissolving a solute in a solvent) is ____________ that of the pure solvent?
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A. More than

B. Either more or less; depends on the solvent

C. Equal to

D. Less than
4504. With rise in temperature, the heat capacity of a substance___________________?
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A. Decreases

B. Remains unchanged

C. Increases

D. Either A. or B.; depends on the substance

4505. Pick out the wrong statement?
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A. Liquid metals and Dowtherm are used for very high temperature heating

B. Safety valves are provided in heat exchangers for removal of non-condensable

C. In a shell and tube heat exchanger, high pressure fluid is generally routed through the tube

D. the condensate

E. A loop seal or U-seal is provided in a vertical condenser sub-cooler to prevent quick draining

4506. Internal energy of a substance comprises of the _____________ energy?
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A. Rotational

B. Vibrational

C. Translational

D. All A., B. & C.
4507. Which of the following fluid flow measuring devices can measure the largest flow rate ?
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A. Weir

B. Orificemeter

C. Rotameter

D. V-notch

4508. For a feed back control system to be stable, the _________________?
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A. Poles of the closed loop transfer function should lie in the right half of the complex plane

B. Poles of the closed loop transfer function should lie in the left half of the complex plane

C. Roots of the characteristic equation should be real

D. Bode plots of the corresponding open loop transfer function should monotonically decrease

4509. Mcleod gauge is used to measure the __________________?
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A. Point velocity

B. Vacuum

C. Flow rate

D. Pressure

4510. Zirconia probe is used for the measurement of___________________?
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A. % CO2 in flue gas

B. % O2 in flue gas

C. Humidity of air

D. Speed of a submarine

4511. The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ C?
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A. 750

B. 250

C. 500
4512. High temperature of around 2000C of incandescent gas mantles is measured by a/an __________________?
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A. None of these

B. Radiation pyrometer

C. Optical pyrometer

D. Specially designed thermocouple

4513. Which of the following filled system expansion thermometer has the capability to measure the lowest temperature ?
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A. Fused metal (Na or K) in steel thermometer

B. Mercury in glass thermometer

C. Alcohol in glass thermometer

D. Mercury in steel thermometer

4514. Polarograph is meant for the analysis of __________________?
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A. Isotopes

B. Miscible liquids

C. Gaseous mixture

D. Solids
4515. The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function ?
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A. (T1S + 1)/(T2S

B. e-?S

C. (T1S/(T2S + 1)

D. (T1S + 1)/(T2S + 1)

4516. Working principle of mercury in glass thermometer is based on the ______________ of mercury with increase in temperature?
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A. Increase of pressure

B. Differential linear expansion

C. Volumetric expansion

D. Increase of thermal conductivity

4517. Time constant is the __________________?
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A. Same as transportation lag

B. Time required by the measured variable to reach 63.2% of its ultimate change

C. Same as dead time

D. Time taken by the controlled variable to reach 63.2% of its full change
4518. In a binary liquid solution of components A? and B?, if component A? exhibits positive deviation from Raoults law, then component B? ?
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A. May exhibit either positive or negative deviation from Raoults law

B. Exhibits negative deviation from Raoults law

C. Exhibits positive deviation from Raoults law

D. Obeys Raoults law

4519. Which of the systems having following transfer functions is stable ?
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A. exp (-20s)/(s2 + 2s 1)

B. 1/(s2 + 2s + 2)

C. 1/(s2 2s + 3)

D. 1/(s2 + 2)

4520. Stabilising time for the controllers is the time required for the response to reach _____________ percent of its ultimate value?
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A. 87.5

B. 100

C. 95

D. 63.2

4521. Change of angle of refraction with composition comprises the working principle of a___________________?
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A. Polarograph

B. Polarimeter

C. Spectrometer

D. Refractometer
4522. A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in_______________?
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A. Current

B. Flux density

C. Voltage

D. Light intensity
4523. Optical activity of a solution can be determined using a ___________________?
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A. Polarograph

B. Refractometer

C. Polarimeter

D. Dilatometer

4524. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the ______________ variable?
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A. Manipulated

B. None of these

C. Controlled

D. Load

4525. A simple pitot tube measures the___________________?
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A. Point velocity

B. Average velocity

C. Maximum velocity

D. Static pressure
4526. Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in ____________ in the electrical resistance of the wire ?
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A. Exponential decrease

B. No change

C. Decrease

D. Increase
4527. Flow rate through an orifice is _____________ the pressure differential?
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A. Proportional to

B. Proportional to the square root of

C. Inversely proportional to the square root of

D. Inversely proportional to the square of

4528. Temperature of molten pig iron (1450C) and molten slag (1500C) flowing out of a blast furnace is measured by a/an_______________?
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A. Radiation pyrometer

B. Chromel-alumel thermocouple

C. Either B. or C.

D. Optical pyrometer

4529. A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is_________________?
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A. 1

B. 2

C. 0.05

D. 0.5
4530. Specific gravity on API scale is given by the relation (where, G = specific gravity at 15.5C) ?
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A. API = (140/G) 130

B. API = 200(G 1)

C. API = 145 (145/G)

D. API = (141.5/G) 131.5
4531. pH meter has ____________________?
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A. Two cells

B. Three cells

C. One cell

D. No cell

4532. An Azeotropic solution of two liquids has boiling point lower than either of them, when it_____________?
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A. Is saturated

B. Is unsaturated

C. Shows positive deviation from Raoults law

D. Shows negative deviation from Raoults law

4533. Reset rate is the another term used for ____________ time?
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A. None of these

B. Integral

C. Derivative

D. Dead

4534. The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by ____________________?
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A. Reducing value of Kc

B. Introducing derivative control

C. None of the above

D. Introducing integral control
4535. For an ideal gas, the compressibility factor________________?
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A. Decreases with pressure rise

B. Is unity at all temperature

C. Is unity at Boyles temperature

D. Zero

4536. Emf developed by a thermocouple while measuring a temperature of 800C is about 31 mV. The type of thermocouple used is________________?
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A. None of these

B. Platinum-platinum + rhodium

C. Iron-constantan

D. Chromel-alumel
4537. Temperature of _____________ cannot be measured by an optical or radiation pyrometer?
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A. Molten slag flowing out of blast furnace

B. Rotary limestone calcination kiln

C. Hot blast (air) from stoves

D. Combustion space in boilers

4538. What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?
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A. 1

B. < 1

C. None of these

D. > 1

4539. Validity of the relationship, inputs = outputs, holds good for the system at steady state________________?
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A. Without chemical reaction & losses

B. Without chemical reaction

C. With chemical reaction

D. None of these

4540. A pyranometer is an instrument used for measuring the___________________?
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A. Beam radiation

B. Global radiation

C. Bright sunshine period

D. None of these

4541. Stroboscope is used for the measurement of _________________?
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A. Frequency of light

B. Rpm of a flywheel

C. Liquid level under pressure

D. Depression of freezing point

4542. Concentration of sugar solution can be determined by the__________________?
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A. Emission spectroscopy

B. Polarimetry

C. Oscillometry

D. Flame photometry

4543. Process degree of freedom indicates _______________ number of controllers to be used?
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A. The maximum

B. The minimum

C. Both maximum and the minimum

D. Nothing about the

4544. Thermal conductivity measurement com-prises the working principle of a_________________?
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A. CO2 analyser

B. Chromatograph

C. Polarimeter

D. Spectrometer

4545. A bolometer is __________________?
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A. Used for the measurement of thermal radiation

B. An element which senses optical input and delivers thermal output

C. Both A. & B.

D. Neither A. nor B.

4546. Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the ________________?
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A. Mercury in glass thermometer

B. Alcohol filled thermometer

C. Iron-constantan thermocouple

D. Optical pyrometer
4547. The ____________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature ?
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A. Volume

B. All A., B. and C.

C. Pressure

D. Viscosity

4548. Liquid argon level in a pressurised storage tank (at 3 kg/cm2) is measured by a/an ____________________?
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A. External float gage

B. None of these

C. Gage glass

D. Differential pressure gage
4549. For a reaction, X ? Y, if the concentration of X is tripled; the rate becomes nine times. The order of reaction is__________________?
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A. 1

B. 0

C. 3

D. 2
4550. Measurement of pressure in ammonia reactor is done by __________________?
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A. Bourdon gauge

B. U-tube manometer

C. Pirani gauge

D. Inclined tube manometer