logo

CuriousTab

CuriousTab

Discussion

Home ‣ Chemical Engineering ‣ Process Control and Instrumentation Comments
  • Question

  • Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.


  • Options
  • A. - 39 and 350
  • B. - 51 and 439
  • C. - 79 and 395
  • D. - 10 and 425

  • Correct Answer
  • - 39 and 350 

    • Process Control and Instrumentation problems

    Search Results

    • 1. A control system has the following transfer function

      The initial value of the corresponding time function is

    • Options
    • A. 1
    • B. 1/8
    • C. 7/8
    • D. -1
      • Discuss
    • 2. Which of the following is not a composition measuring instrument?

    • Options
    • A. Thermal conductivity cell
    • B. Mass spectrometer
    • C. Polarograph
    • D. Hot wire anemometer
      • Discuss
    • 3. Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

    • Options
    • A. - 273° & 80°
    • B. 0° & 80°
    • C. 32° & 460°
    • D. 32° & 80°
      • Discuss
    • 4. Gain margin is equal to the

    • Options
    • A. amplitude ratio
    • B. reciprocal of amplitude ratio
    • C. gain in P controller
    • D. gain in P-I controller
      • Discuss
    • 5. Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?

    • Options
    • A. Optical pyrometer
    • B. Radiation pyrometer
    • C. Photoelectric pyrometer
    • D. Thermocouples
      • Discuss
    • 6. Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

    • Options
    • A. Platinum resistance thermometer
    • B. Mercury in glass thermometer
    • C. Vapor pressure thermometer
    • D. Radiation pyrometer
      • Discuss
    • 7. Dome temperature of blast furnace stove is most accurately measured by a

    • Options
    • A. radiation pyrometer.
    • B. platinum-platinum/rhodium ther-mocuple.
    • C. iron-constantan thermocouple.
    • D. platinum resistance thermometer.
      • Discuss
    • 8. Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

    • Options
    • A. 250
    • B. 350
    • C. 550
    • D. 700
      • Discuss
    • 9. A manometer measures the __________ pressure.

    • Options
    • A. atmospheric
    • B. absolute
    • C. gauge
    • D. none of these
      • Discuss
    • 10. Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

    • Options
    • A. chromel-alumel
    • B. iron-constantan
    • C. platinum-platinum+rhodium
    • D. none of these.
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.