chemical engineering MCQs – Page 248

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 Review each marked answer and report any item that may be outdated or unclear.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
4941. 75% of a radioactive element decays in 6 hours. Its half life period is ______________ hours?
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A. 4

B. 4-Mar

C. 6-Jan

D. 3
4942. The most abundant isotope of natural uranium is ___________________?
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A. 92U238

B. 92U234

C. None of these

D. 92U235

4943. Stability of a control system containing a transportation lag can be best analysed by_______________?
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A. Frequency response methods

B. None of these

C. Routh test

D. Root locus methods

4944. The function of a transducer is to _______________ ?
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A. Modify the input signal

B. Amplify the input signal

C. Codify/decodify the input signal

D. Convert the primary signal into a more useful quantity, usually an electric impulse
4945. Silver point temperature is ______________ C?
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A. 760.5

B. 960.5

C. 860.5

D. 1060.5

4946. Which of the following controllers has maximum offset ?
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A. P-controller

B. P-D controller

C. P-I-D controller

D. P-I controller

4947. Which of the following flow-metering instruments is an areameter ?
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A. Rotameter

B. Pitot tube

C. Venturimeter

D. Hot wire anemometer

4948. Routh test_________________?
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A. Criterion is not applicable to systems with polynomial characteristic equation

B. Cannot be used to test the stability of a control system containing transportation lag

C. Criterion provides information about the actual location of roots

D. Cannot determine as to how many roots of the characteristics equation have positive real roots

4949. A nuclear reactor cant be used for_________________?
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A. Marine ship propulsion

B. None of these

C. The production of radioisotopes

D. Supplying intense fields or beams of neutron for scientific experiments

4950. Typical specifications for design stipulates the gain margin and phase margin to be respectively__________________?
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A. 30

B. > 1.7 and > 30

C. < 1.7 and 1.7 and < 30

4951. Which of the following nuclear materials is fissile ?
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A. Plutonium-239

B. None of these

C. Thorium-232

D. Uranium-238

4952. Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit ?
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A. Joule heating effect

B. Peltier effect

C. Seebeck effect

D. Thomson effect

4953. Bourdon tube is never made of________________?
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A. Cast iron

B. Stainless steel

C. Phosphor bronze

D. Monel metal

4954. Which of the following cannot measure a temperature of 1600C ?
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A. Platinum resistance thermometer

B. Radiation pyrometer

C. Photo-electric pyrometer

D. Thermocouple

4955. Which of the following instruments is not used for measuring sub-zero (<0) temperatures ?
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A. Platinum resistance thermometer

B. Vapor pressure thermometer

C. Mercury in glass thermometer

D. Radiation pyrometer
4956. Which of the following is not classified as a thermo electric pyrometer ?
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A. Radiation pyrometer

B. Thermocouple

C. Resistance thermometer

D. Optical pyrometer (disappearing filament type)
4957. A homogeneous reactor is the one, in which the___________________?
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A. All A., B. and C.

B. The fuel and the moderator is mixed to form a homogeneous material

C. Same substance (e.g. heavy water) is used as moderator & coolant

D. Fissile atoms are evenly distributed throughout the mass of nuclear reactor

4958. Which is used as a coolant in nuclear reactor due to its high capture cross-section ?
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A. CO2

B. N2

C. H2

D. He

4959. Which of the following measurements can be made by the measurement of emf ?
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A. pH value

B. Composition of complex ions

C. All A., B. & C.

D. Degree of hydrolysis

4960. In second order underdamped system ?
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A. Decay ratio = (overshoot)2

B. Decay ratio = overshoot

C. Overshoot increases for increasing damping co-efficient

D. Large damping co-efficient means smaller damping