A. Chromel-alumel thermocouple
B. Optical pyrometer
C. Radiation pyrometer
D. Either B. or C.
Related Mcqs:
- Dome temperature of blast furnace stove is most accurately measured by a____________________?
A. Radiation pyrometer
B. platinum-platinum/rhodium thermocouple
C. Iron-constantan thermocouple
D. Platinum resistance thermometer - Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop?
A. Tank 1
B. Tank 2
C. Tank 3
D. Tank 4 - Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?
A. Radiation/infrared pyrometer
B. Filled system thermometer
C. Mercury in glass thermometer
D. Thermo electric pyrometer - Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is __________________?
A. Water
B. Carbon tetrachloride
C. Paraffin
D. Ethylene glycol - Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are________________?
A. Air to open valve with the controller direct acting
B. Air to close valve with the controller indirect acting
C. Air to open valve with the controller indirect acting
D. Air to close valve with the controller direct acting - 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) - 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 - The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an _____________ thermocouple?
A. Chromel-alumel
B. Iron-constantan
C. Platinum-platinum/rhodium
D. None of these - 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 - Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing ?
A. Helium
B. Nitrogen
C. Hydrogen
D. None of these
