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

Related Mcqs:

1. Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 – 1600°C ?

   A. Optical pyrometer
   B. Radiation pyrometer
   C. Photoelectric pyrometer
   D. Thermocouples

2. Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere ?

   A. Platinum-platinum + rhodium
   B. Iron-constantan
   C. Copper-constantan
   D. Chromel-alumel

3. Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C ?

   A. Mercury thermometer
   B. Bimetallic thermometer
   C. Radiation pyrometer
   D. None of these

4. 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?

   A. 250
   B. 350
   C. 550
   D. 700

5. 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

6. Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is________________?

   A. Chromel-alumel
   B. Iron-constantan
   C. Platinum-platinum + rhodium
   D. None of these

7. For measuring the temperature of a red hot furnace, which is the most suitable instrument ?

   A. Platinum resistance thermometer
   B. Thermocouple
   C. Optical pyrometer
   D. Bimetallic thermometer

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

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

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

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

10. 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