Basic Instrumentation Ch 7 Flashcards
0 Kelvin / -273 Celsius / 0 Rankine / -460 Farenheit
Is the temperature that all molecular activity will cease
a) true
b) false
a) true
The four most common fluids to fill liquid thermometers are:
a) pentane, oil, water, mercury
b) mercury, toluene, oil, alcohol
c) mercury, alcohol, toluene, pentane
d) none above
c) mercury, alcohol, toluene, pentane
A bimetal thermometer uses two strips of metal, both with low coefficients of thermal expansion?
a) true
b) false
b) false
What are 4 usual elements used in filled-system thermometers ?
a) capillary tube transmission
b) auxiliary relays
c) indicating device (bourdon type)
d) metallic bulb containing temperature sensitive fluid
e) large bulbs
f) compensating elements
a) capillary tube transmission
c) indicating device (bourdon type)
d) metallic bulb containing temperature sensitive fluid
f) compensating elements
Name four disadvantages of using filled temperature system
a) large bulbs (gas)
b) no low temp capability (mercury)
c) thermo-resistive elements
d) requires compensation
e) small bulbs
f) non-linear scale
a) large bulbs (gas)
b) no low temp capability (mercury)
d) requires compensation
f) non-linear scale
What type of electronic temperature sensor makes use of the voltage created by joining two dissimilar metals?
a) oxides of thermo-resistive metals
b) optic pyrometers
c) thermocouples
d) thermo-resistive elements
c) thermocouples
Thermal expansion is the principle of operation of a liquid filled thermometer
a) true
b) false
a) true
The two-wire (current transmitter) is the most popular electric temperature transmitter?
a) true
b) false
a) true
Smart Temperature transmitters can be calibrated anywhere along the signal loop
a) true
b) false
a) true
