chemical engineering MCQs – Page 233

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
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

4651. When the damping co-efficient (?) is unity, the system is __________________?
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A. Underdamped

B. Critically damped

C. Overdamped

D. Highly fluctuating

4652. Response of a linear control system for a change in set point is called __________________?
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A. Transient response

B. Servo problem

C. Frequency response

D. Regulator problem

4653. A pyrheliometer is an instrument used for measuring the_________________?
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A. Bright sunshine period

B. Diffuse radiation

C. None of these

D. Beam radiation
4654. Mass number of an atom is the sum of the numbers of_________________?
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A. Neutrons and protons

B. Protons and electrons

C. Neutrons and electrons

D. Both A. & B.
4655. 1 BTU/ft3 is approximately equal to _____________ kcal/m3?
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A. 1

B. 252

C. 9

D. 4

4656. Pressure of 0.0001 absolute psi can be measured by _____________ gauge?
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A. None of these

B. Mcleod

C. Pirani

D. Thermocouple

4657. Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant) ?
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A. nRT/V

B. P/nRT

C. V/nRT

D. nRT/P

4658. Flapper nozzle is used in a/an ______________ controller?
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A. Pneumatic

B. None of these

C. Electronic

D. Hydraulic

4659. Which of the following is an exothermic reaction ?
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A. Decomposition of water

B. Conversion of graphite to diamond

C. None of these

D. Dehydrogenation of ethane to ethylene

4660. On-off control which is a special case of proportional control, has a band width of about _____________ percent?
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A. 75

B. 25

C. 100

D. 0