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What is the purpose of an indicator in an instrument system?

• To provide a human-readable indication of an instrument signal

• To transmit a standard instrument signal

• To withstand radiation

• To perform conversion calculations

What is a common feature of process transmitters?

• They are always equipped with readouts

• They just transmit a standard instrument signal to another device

• They are always located near the indicators

• They can only connect to one indicator

What technology does the field-mounted indicator use for its numerical display to use less electrical power?

• Bargraphs

• LCD technology

• Red-glowing LEDs

• Standard instrument signals

What is the purpose of a recorder in an instrument system?

• To draw a graph of process variable(s) over time

• To withstand radiation

• To transmit a standard instrument signal

• To perform conversion calculations

What types of recorders are still in use today?

• Both circular and strip chart recorders

• Only strip chart recorders

• Neither circular nor strip chart recorders

• Only circular chart recorders

What does the controller do to maintain the process variable at setpoint? PHOTO

• It changes its output as necessary

• It keeps the output signal constant

• It reduces the process variable

• It ignores variations in process load

What could a wildly-fluctuating output signal indicate? PHOTO

• The control system is working well

• The control system is not working well

• The process variable is deviating significantly from the setpoint

• The controller is in manual mode

What is the delay between when the output signal is “stepped” to a new value and when the process variable responds to the change called? PHOTO

• Transport delay

• Dead time

• Process load

• Mechanical friction

What is the purpose of a process switch in a measurement and control system?

• To turn on and off with varying process conditions

• To withstand radiation

• To transmit a standard instrument signal

• To perform conversion calculations

What activates the “PSH” (pressure switch, high) and the “PSL” (pressure switch, low)? PHOTO

• The air pressure outside the vessel reaching its high control point and dropping down to its low control point, respectively

• The air pressure outside the vessel dropping down to its low control point and reaching its high control point, respectively

• The air pressure inside the vessel dropping down to its low control point and reaching its high control point, respectively

• The air pressure inside the vessel reaching its high control point and dropping down to its low control point, respectively