Hot wire anemometer is used for the measurement of___________________?

Related Mcqs:

1. Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in ____________ in the electrical resistance of the wire ?

   A. No change
   B. Decrease
   C. Increase
   D. Exponential decrease

2. Zirconia probe is used for the measurement of___________________?

   A. Humidity of air
   B. % CO2 in flue gas
   C. % O2 in flue gas
   D. Speed of a submarine

3. The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C?

   A. 250
   B. 500
   C. 750

   D. 1000

4. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?

   A. Peltier effect
   B. Thomson effect
   C. Seebeck effect
   D. None of these

5. Out of the following thermocouple wire insulating material, the highest temperature rating is for________________?

   A. Teflon
   B. Ceramic fibre
   C. Asbestos
   D. Fibre glass

6. Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?

   A. Platinum-platinum + rhodium
   B. Iron-constantan
   C. Chromel-constantan
   D. All will give the same output

7. The calibration data of a thermocouple with its cold junction at 0°C are given below. The hot junction of the thermocouple is placed in a bath at 80°C, while its cold junction is at 20°C. What is the emf of thermocouple ?

   A. 3.26 mv
   B. 0.80 mv
   C. 2.46 mv
   D. 2.43 mv

8. 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

9. 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

10. The unit of ‘time constant’ of a system is the same as that of___________________?

    A. Velocity
    B. Time
    C. (Time)-1
    D. None of these