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EPRI A EXAM 3 – QUESTIONS WITH CORRECT ANSWERS
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EPRI A EXAM 3 – QUESTIONS WITH CORRECT ANSWERS
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EPRI A EXAM 3 – QUESTIONS WITH CORRECT ANSWERSThermistors Correct Ans - temperature transducers constructed
from semiconductor material
Optical pyrometers can measure blank to determine the temperature of a
hot surface Correct Ans - infrared radiation
a temperature sensing element that provides temperature information in
the form of a change in the resistance of the metal wire element, often
platinum, as a function of temperature Correct Ans - RTD
Which of the following applies to an RTD Correct Ans - operation is
based on direct relationship between the electrical resistance in Milli
voltage
as a speed velocity of a fluid increases through a restriction, the static
pressure blank Correct Ans - decreases
the output of a Target flow meter is proportional to Correct Ans -
the square root of volumetric flow rate
because flow rate is the square root of the pressure drop across a
restriction, it is usually necessary to extract the square root linearize the
output of an orifice meter when Correct Ans - a square root
extractor is in the loop
rotor speed in a turbine meter is proportional to Correct Ans - fluid
flow rate
which dimension of an orifice plate is most critical Correct Ans -
the
an open Channel flow measurement device often used to measure the flow
of Wastewater in a ditch or Canal from an industrial site is Correct Ans
- weir
, to change the 4 to 20 milliamp analog signal from a transmitter to the
signal required by a digital controller a blank must be part of the
instrument single Loop Correct Ans - a\d converter
a Pneumatic valve without a positioner is the final control element in an
instrument Loop the transmitter in the controller are both electronic in
order for this control system to operate, a must be installed any
instruments signal line between the controller and the control valve
Correct Ans - i/p transducer
which of the following instrument transmission signals would be least
affected by a lightning storm Correct Ans - fiber optics
which of the following instrument transmission signals usually has the
most dead band in the slowest response when in the transmitters located
thousand feet or more from the receiving instrument Correct Ans -
pneumatic
transmitters output must be adjusted to the blank of the measured variable
Correct Ans - range
transmitter gain should be blank over its entire range Correct Ans -
constant
the zero output from a Pneumatic transmitter is normally 3 PSI the zero
output from an electronic transmitter is normally for milliamps these
instruments have a live 0 Correct Ans - to ensure accurate zero
adjustment
when calibrating a mechanical link are lever instrument such as a pressure
gauge which adjustment is usually made first Correct Ans - span
which of the following is usually adjusted first when calibrating an
electronic pressure transmitter Correct Ans - zero
the pressure switch normally produces a Correct Ans - discrete
output
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