Ramsay Test Process Flow and Instrumentation 2 — Questions and Answers
Question 1: On a P&ID, a circle with a single horizontal line through the middle indicates an instrument that is:
- Field mounted, locally accessible to the operator
- Mounted on the main control panel in a central control room (Correct answer)
- Mounted behind a panel and not normally accessible
- A shared display or computer function
Correct answer: Mounted on the main control panel in a central control room
A single solid horizontal line means the instrument is panel-mounted in a primary location such as the control room.
Question 2: In the ISA tag 'FIC-101', the second letter 'I' stands for:
- Input
- Indicate (Correct answer)
- Interlock
- Integrate
Correct answer: Indicate
In ISA identification, 'I' is the modifier for Indicate, so FIC is a Flow Indicating Controller.
Question 3: A device that converts a 3-15 psi pneumatic signal into a 4-20 mA electronic signal is called a:
- Transducer (Correct answer)
- Transmitter
- Orifice plate
- Rotameter
Correct answer: Transducer
A transducer (I/P or P/I) converts a signal from one form of energy to another, here pneumatic to electronic.
Question 4: Which line type on a P&ID typically represents an electrical signal?
- A solid heavy line
- A line with double cross-hatches
- A dashed line (Correct answer)
- A line with small circles or bubbles
Correct answer: A dashed line
Electrical signal lines are conventionally drawn as dashed lines on a P&ID.
Question 5: A normally-closed fail-safe control valve will move to which position when its air supply is lost?
- Fully open
- Fully closed (Correct answer)
- Holds its last position
- Half open
Correct answer: Fully closed
A fail-closed (air-to-open) valve loses its actuating air and the spring drives it shut.
Question 6: The primary purpose of a process flow diagram (PFD) compared to a P&ID is to show:
- Every valve, instrument and pipe size
- The major equipment and overall process flow (Correct answer)
- Electrical wiring details
- The control room panel layout
Correct answer: The major equipment and overall process flow
A PFD gives a high-level view of major equipment and material flow, while the P&ID adds full instrumentation detail.
Question 7: An orifice plate measures flow by detecting:
- The temperature rise across the plate
- The pressure drop created as fluid passes through the restriction (Correct answer)
- The electrical conductivity of the fluid
- The weight of fluid in the pipe
Correct answer: The pressure drop created as fluid passes through the restriction
An orifice plate creates a restriction, and the differential pressure across it is proportional to flow rate.
Ramsay Test Process Flow and Instrumentation 2
On a P&ID, a circle with a single horizontal line through the middle indicates an instrument that is: