Exam 1 prep (Level 2 exam questions)

What is the Value measured by an Instrument?

Variable

What is the desired value at which the process should be controlled to

Set point

What is the sensing device that detects the condition of the Process Variable

Primary element (Sensor)

What is the difference between the highest and lowest number in a Range

Span

What part of the Process Control System receives information from the Primary Element, compares that value to a set point and sends a corrective signal to the Final Element

• Control Element

What best describes the values for the minimum and Maximum limits of a gauge

• Range

What best describes when a measurement device displays a different reading when it approaches the measurement from the lower range value or from the upper range value

• Hysteresis

What is a device that receives the control signal and regulates the amount of material in the process?

• Final Element (Actuator)

Which of the following is an example of a quantity rather the a unit of measure

• Watt

• Resistance

• Ampere

• Seconds

• Resistance

What is the closeness to which multiple measurements approximate a straight line

• linearity

A pressurized tank must maintain a gas pressure of 250 PSI.

A pressure sensor is used to measure the condition of the control variable

As the gas cools the pressure in the tank decreases

When it drops to 200 PSI a valve is opened which allows the steam to flow to the heat exchanger inside the tank

The addition of steam heats the gas and causes pressure to rise

A) Gas Pressure D) 200PSI

B) Stem Flow E) Pressure

C) 250 PSI F) Heat

What is the Step point?

• C) 250 PSI

A pressurized tank must maintain a gas pressure of 250 PSI.

A pressure sensor is used to measure the condition of the control variable

As the gas cools the pressure in the tank decreases

When it drops to 200 PSI a valve is opened which allows the steam to flow to the heat exchanger inside the tank

The addition of steam heats the gas and causes pressure to rise

A) Gas Pressure D) 200PSI

B) Stem Flow E) Pressure

C) 250 PSI F) Heat

What is the Measured Variable

• Pressure

A pressurized tank must maintain a gas pressure of 250 PSI.

A pressure sensor is used to measure the condition of the control variable

As the gas cools the pressure in the tank decreases

When it drops to 200 PSI a valve is opened which allows the steam to flow to the heat exchanger inside the tank

The addition of steam heats the gas and causes pressure to rise

A) Gas Pressure D) 200PSI

B) Stem Flow E) Pressure

C) 250 PSI F) Heat

What is the Control Variable

• Gas Pressure

A pressurized tank must maintain a gas pressure of 250 PSI.

A pressure sensor is used to measure the condition of the control variable

As the gas cools the pressure in the tank decreases

When it drops to 200 PSI a valve is opened which allows the steam to flow to the heat exchanger inside the tank

The addition of steam heats the gas and causes pressure to rise

A) Gas Pressure D) 200PSI

B) Stem Flow E) Pressure

C) 250 PSI F) Heat

What is the Manipulated Variable

Steam Flow