Ramsay Test Process Flow and Instrumentation 3

Question 1

A PID controller's 'derivative' action responds to:

Accepted Answer

The rate at which the error is changing

Answer

Derivative action reacts to how fast the error is changing, helping to dampen rapid swings.

Question 2

Which instrument would you use to measure the level in a sealed pressurized tank using differential pressure?

Accepted Answer

A DP level transmitter with high and low side taps

Answer

A DP level transmitter compares pressure at the bottom and top of a closed tank to infer liquid level.

Question 3

In a cascade control loop, the output of the primary (master) controller becomes the:

Accepted Answer

Setpoint of the secondary (slave) controller

Answer

In cascade control the master controller's output sets the setpoint of the slave controller.

Question 4

A thermocouple generates a measurable voltage based on the:

Accepted Answer

Temperature difference between two dissimilar metal junctions

Answer

A thermocouple uses the Seebeck effect, producing a voltage from the temperature difference at two dissimilar-metal junctions.

Question 5

On a P&ID, the abbreviation 'PSV' attached to a vessel most likely identifies a:

Accepted Answer

Pressure safety (relief) valve

Answer

PSV stands for pressure safety valve, a relief device that protects equipment from overpressure.

Ramsay Test Practice Test