chemical engineering MCQs – Page 244

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 Review each marked answer and report any item that may be outdated or unclear.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
4861. The molecular weight of heavy water is_________________?
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A. 18

B. 36

C. 20

D. 10

4862. Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ?
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A. Mercury in glass thermometer

B. Fused metal (Na or K) in steel thermometer

C. Alcohol in glass thermometer

D. Nitrogen in steel thermometer

4863. Mercury thermometer is commonly used for low temperature measurement. The freezing point and boiling point of mercury are respectively _____________ C?
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A. 39 and 350

B. 51 and 439

C. 79 and 395

D. 10 and 425

4864. A typical example of a physical system with under damped characteristic is a____________________?
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A. U-tube manometer

B. Spring loaded diaphragm valve

C. Thermocouple kept immersed in a liquid filled thermowell

D. CSTR with first order reaction

4865. Instrumentation in a plant offers the advantage of_______________?
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A. Greater safety of operation

B. Greater operation economy

C. Better quality of product

D. All A., B. and C.
4866. Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively_________________?
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A. 273 & 80

B. 32 & 80

C. 32 & 460

D. 0 & 80
4867. Heavy water is preferred over ordinary water as a coolant, because it?
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A. Acts both as an efficient coolant as well as a moderator

B. Can be heated to a higher temperature without pressurizing

C. Is less prone to radiation damage

D. All A., B. and C.
4868. A mercury thermometer cannot be used to measure the temperature below the freezing point of mercury, which is _____________ C?
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A. -38.9

B. -80.9

C. -60.9

D. -11.9

4869. A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is______________?
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A. -180

B. -45

C. 45

D. -90

4870. Which of the following is not a naturally occurring nuclear fuel ?
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A. Uranium-238

B. Plutonium-239

C. None of these

D. Thorium-233

4871. Which of the following undergoes fission reaction easily ?
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A. U-235

B. U-238

C. None of these

D. Th-232

4872. First experimental observation of nuclear fission was done by ____________________?
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A. Plane

B. Fermi

C. Rutherford

D. Hahn and Strassmann

4873. For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a__________________?
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A. High thermal conductivity

B. All A , B & C

C. Large area but small mass

D. Small specific heat

4874. Presence of a small amount of water in the organic systems can be determined by the _____________ method?
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A. Polarimetry

B. Dielectric constant end loss factor

C. Electrical conductivity

D. Emission spectroscopy

4875. Continuous measurement of moisture content of paper in paper industry is done by measuring the_________________?
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A. None of these

B. Magnetic susceptibility

C. Electrical resistance through the paper

D. Thermal conductivity through the paper

4876. Uranium percentage in monazite sand is about________________?
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A. 0.25

B. 7

C. 1.2

D. 0.01

4877. Bourdon gauges are used for measuring pressure (kg/cm2) ?
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A. > 2 (gauge)

B. 10 (absolute)

C. < atmospheric

4878. The atomic number of a radioactive element is not changed, when it emits _____________ rays?
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A. ? & ?

B. ?

C. ?

D. ?

4879. The main purpose of control rod in a nuclear reactor is to control the___________________?
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A. sing fission</strong>

B. Chain reaction and hence the power output by regulating the number of secondary neutrons

C. Emission of hazardous radiation

D. Velocity of the secondary neutrons

E. Conversion of fissile material into fertile material

4880. The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60, then the dead time (in minutes) is________________?
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A. ?/6

B. ?/3

C. ?/12

D. 5?/12