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.Management Sciences
Category: Process Control and Instrumentation
Thermistors are made of__________________?
A. Ultra pure metals
B. Metal oxides
C. Iron-copper alloys
D. Nickel-chromium alloys
A constant volume gas thermometer employing ______________ is used to measure sub-zero (i.e., < 0°C) temperature?
A. Helium
B. Hydrogen
C. Nitrogen
D. None of these
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
An aneroid barometer measures the _____________ pressure?
A. Atmospheric
B. Absolute
C. Vacuum
D. Gage
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
Nitrogen gas constant volume thermometer is suitable for measuring a temperature of _____________ °C?
A. 0-100
B. < 0
C. > 100
D. > 50
______________ is undesirable in thermocouples used in industries ?
A. Linear relation of emf to temperature
B. Corrosion resistance
C. Oxidation resistance
D. Non-linear relation of emf to temperature
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
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
Which of the following does not figure in the list of seven substances selected for international temperature scale ?
A. Ice (F.P) and steam (B.P)
B. Oxygen and sulphur (B.P)
C. Antimony and silver (F.P)
D. Zinc (B.P) and mercury (F.P)
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