A. Very thick walls
B. Low emissivity
C. Polished surface
D. High transmissivity of radiation
Related Mcqs:
- Thermal wells are used in the temperature measurement to____________________?
A. Guard against corrosive and oxidising action on thermocouple materials
B. Reduce measuring lag
C. Increase the fidelity
D. Increase the sensitivity - Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity ?
A. CO2
B. N2
C. O2
D. CO - Which of the following measurements can be made by the measurement of emf ?
A. pH value
B. Degree of hydrolysis
C. Composition of complex ions
D. All A., B. & C. - Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion ?
A. Nickel
B. Brass
C. Chromel
D. Invar - 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) - Thermal well made of _____________ gives the fastest speed of response, while measuring temperature by thermocouples?
A. Steel
B. Vycor (a glass)
C. Nichrome
D. Inconel - The thermal emf-temperature relationship of most thermocouples is_________________?
A. Linear
B. Parabolic
C. Exponential
D. Square root - Platinum resistance thermometer is the international standard for temperature measurement between __________________?
A. Triple point of hydrogen and freezing point of antimony
B. 13.81°K to 903.9°K
C. Both A. and B.
D. Neither A. nor B. - Measurement of sub-zero Celsius temperature in industry is done most commonly by __________________?
A. Thermocouples
B. Resistance thermometers
C. Gas thermometers
D. Bi-metallic thermometers - High temperature of around 2000°C of incandescent gas mantles is measured by a/an __________________?
A. Specially designed thermocouple
B. Optical pyrometer
C. Radiation pyrometer
D. None of these
