Related Mcqs:

1. 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

2. Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the ________________?

   A. Mercury in glass thermometer
   B. Optical pyrometer
   C. Iron-constantan thermocouple
   D. Alcohol filled thermometer

3. Temperature measuring instruments are standardised mostly with _____________ points of pure substances?

   A. Melting
   B. Boiling
   C. Both A. & B.
   D. Neither A. nor B.

4. 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

5. Which of the following instruments is not used for measuring sub-zero (<0°) temperatures ?

   A. Platinum resistance thermometer
   B. Mercury in glass thermometer
   C. Vapor pressure thermometer
   D. Radiation pyrometer

6. 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

7. Which of the following thermocouples is capable of measuring a temperature of -50°C ?

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

8. Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as________________?

   A. Q0(T0 – T) = Ac . h (dT/dt)
   B. Q0T0 – QT = Ac . h (dT/dt)
   C. Q(T0 – T) = Ac . h (dT/dt)
   D. Q(T0 – T) = Ac . (dTH/dt)

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. 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