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epri a exam 3 questions and answers
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epri a exam 3 questions and answersthermistors - Answers -temperature transducers constructed from semiconductor
material
Optical pyrometers can measure blank to determine the temperature of a hot surface -
Answers -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 - Answers -RTD
which of the following applies to an RTD - Answers -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 -
Answers -decreases
the output of a Target flow meter is proportional to - Answers -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 - Answers -a square root extractor is in the loop
rotor speed in a turbine meter is proportional to - Answers -fluid flow rate
which dimension of an orifice plate is most critical - Answers -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 - Answers -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 - Answers -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 - Answers -i/p transducer
, which of the following instrument transmission signals would be least affected by a
lightning storm - Answers -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 - Answers -pneumatic
transmitters output must be adjusted to the blank of the measured variable - Answers -
range
transmitter gain should be blank over its entire range - Answers -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 -
Answers -to ensure accurate zero adjustment
when calibrating a mechanical link are lever instrument such as a pressure gauge which
adjustment is usually made first - Answers -span
which of the following is usually adjusted first when calibrating an electronic pressure
transmitter - Answers -zero
the pressure switch normally produces a - Answers -discrete output
and install two wire electronic flow transmitter normally receives power from a - Answers
-an auxiliary 24 volt DC power supply
electrical noise is a real problem in instrument Loop performance when it - Answers -is
induced on the loop signal wires
a transmitter is called smart because it - Answers -can communicate digitally with any
other instrument regardless of the manufacturer
if it becomes necessary to rearrange a smart transmitter the configuration interface
device is connected to the transmitter output signal circuit - Answers -in parallel with the
receiving instrument connected
if it changes process conditions make it necessary to rearrange a smart transmitter the
instrument technician - Answers -connect a handheld Communicator and rearrange the
transmitter
set smart transmitters blank they may contribute significantly to Personnel safety -
Answers -can be rearranged remotely
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