TUNE YOUR LOOP: Troubleshooting Instrumentation and Control Systems

TUNE YOUR LOOP: Questions to keep you sharp.

Tune Your Loop is a series of posts consisting of questions from ISA Training Courses.

1. Standard analog instrument pneumatic signals are:

  1. 1 to 5 psig (6.9 to 34.5 kPa gage).
  2. 4 to 20 psig (27.6 to 137.9 kPa gage).
  3. 3 to 15 psig (20.7 to 103.4 kPa gage).
  4. 0 to 20 psig (0 to 137.9 kPa gage).
  5. 6 – 30 psig

2. From ANSI/ISA-5.1-1984, “Instrument Symbols and Identification:” The line
symbol ———- denotes a:

  1. Digital Signal
  2. Mechanical link
  3. Electrical signal
  4. Pneumatic signal
  5. Hydraulic signal

3. A ____________ control system evolved from central computer control of the
1960s and was developed initially for continuous flow processes that required
loop, analog, and limited discrete control.

  1. DDC
  2. Supervisory
  3. PLC
  4. DCS
  5. FF

4. A ________ is a microcomputer-based control device that was originally designed
to replace relay logic in the automotive industry.

  1. DDC
  2. PC
  3. DCS
  4. PLC
  5. FF

 

What are your answers before you read ahead?

1. c

2. c

3. d

4. d

 

From the ISA Course Troubleshooting Instrumentation and Control Systems (TC10) pre-instructional survey.

 

 

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