Working principle of radiation pyrometer is based on the ________________?

Related Mcqs:

1. Working principle of radiation pyrometer is based on the __________________?

   A. Wien’s law
   B. Kirchoff’s law
   C. Stefan Boltzmann law
   D. Seebeck effect

2. Working principle of disappearing filament type optical pyrometer is based on the ________________?

   A. Wien’s law
   B. Seebeck effect
   C. Kirchoff’s law
   D. Peltier effect

3. Temperature of _____________ cannot be measured by an optical or radiation pyrometer?

   A. Hot blast (air) from stoves
   B. Molten slag flowing out of blast furnace
   C. Combustion space in boilers
   D. Rotary limestone calcination kiln

4. Starting temperature of optical radiation pyrometer is ______________ °C?

   A. 800
   B. 400
   C. 1200
   D. 1500

5. Accurate temperature measurement performance of a radiation pyrometer cannot be affected, if the ?

   A. Enhancement or attenuation of radiation occurs in the sighting path
   B. Object and surrounding are at almost the same temperature
   C. Object has varying emissivity
   D. Object is transparent

6. Working principle of mercury in glass thermometer is based on the ______________ of mercury with increase in temperature?

   A. Increase of pressure
   B. Increase of thermal conductivity
   C. Volumetric expansion
   D. Differential linear expansion

7. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change ?

   A. Water
   B. Mercury
   C. Methyl alcohol
   D. Carbon-tetrachloride

8. Temperature measurement by optical pyrometer is done above ____________ point, which is 1063°C ?

   A. Antimony
   B. Gold
   C. Silver
   D. Nickel

9. Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an _____________ pyrometer?

   A. Radiation
   B. Optical
   C. Photoelectric
   D. None of these

10. Which of the following is not classified as a thermo electric pyrometer ?

    A. Resistance thermometer
    B. Thermocouple
    C. Optical pyrometer (disappearing filament type)
    D. Radiation pyrometer