277 book
How much heat is needed to raise the temperature of 1 gallon of water 1C° at atmosphere pressure?
1 cabrie
in the US the traditional unit of measure for heat is the?
BTU
the thermocouple ____ junction is heated to create a temperature difference that generates a emf
measuring
in an automatic optical pyrometer, the filter passes radiation directly from the ___ to the ___
modulator ; detector
the filament of a manual optical pyrometer will ___ when you have adjusted it properly
disappear
the coefficient of thermal expansion is the basis for the ___ thermometer
bimetallic
an optical pyrometer senses the ____ of emitted radiation
brightness
which pyrometer can be used only for the visible light range?
narrow band
the advantage of using an optical pyrometer to calibrate high-temp thermocouple is that the optical pyrometer
does not physically touch the thermocouple
the ability of a surface to send out radiant energy is called
emissivity
when used in high temperature applications, liquid-in-glass thermometers should be
charged with nitrogen above the filling liquid
paints, crayons, and labels that change ____ can be used to determine if a process has reached a certain temperature
color
the main purpose in winding a bimetallic strip into helix is to
fit a longer strip into a small space
the proper amount of water is especially important in the use of a(n)
ice bath
which of the following are you most apt to use for calibrating temp instrument in the field?
platinum resistance thermometer
an advantage of the averaging thermometer bulb is that it
provides a rapid response to temp changes
temperature can be determined with ____ cones that soften droop as temperature increases
pyrometer or seger
pyrometer measure ____ heat, from which temperature is inferred.
radiated
an RTD measurement ____ to convert temperature changes to voltage signals
resistance
You can compensate for thermocouple reference junction temperature deviations with
resistors
advantages of RTDs include all of the following except?
self-powering capability
the ITS-90 instrument calibration standard is based on the
temperature at which substance change state
resistance thermometers and ____ indicate temperature by sensing changes in electrical resistance
thermistors
color-change indicators are dependent on both temperature and ____
time
the fix points for temperature scale calibration are the melting point, freezing point, and ____ point of certain substances.
triple
if pressure remains constant, an increase it thermal energy is required for
water to vaporize to steam
a liquid compassion bath is used to calibrate
working thermometer
the hypothetical temperature at which a substance would have no thermal energy is referred to
absolute zero
to correct the reading of a bimetallic thermometer
adjust the length of the strip
what is currently the most commonly used filling liquid in liquid-ib-glass thermometers?
alcohol
if an object at 100k radiates 100w, how much energy will it radiate if you heat it to 200k?
200w
which of the following is equivalent to 95* F in the Celsius scale
35*C
instruments certified by ___ are primary standard instrument and be used to calibrate other instrument
NIST
RTD lead wire measurement error can be overcome by?
calibrating the instrument
