TUNE YOUR LOOP: Questions to keep you sharp.

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

1. The most frequent malfunction to be expected in a pneumatic transmitter is a __________.

[ordered_list style=”lower-alpha”]
  1. leaking air line
  2. plugging of the nozzle restrictor
  3. power failure
  4. rupture of the bellows[/ordered_list]

2. A positioner is a device that:

[ordered_list style=”lower-alpha”]
  1. positions the actuator input port to align with the pilot
  2. acts as a moveable diaphragm toward the output
  3. causes the valve stem to align with signal input
  4. drives the actuator relief valve negative[/ordered_list]

3. The normal pneumatic analog signal is:

[ordered_list style=”lower-alpha”]
  1. 3 to 27 psi (20 to 180 kPa)
  2. 3 to 15 psi (20 to 100 kPa)
  3. 6 to 30 psi (40 to 200 kPa)
  4. 3 to 30 psi (20 to 200 kPa)[/ordered_list]

4. When connecting a dip tube (bubbler) to measure open vessel levels, the pressure
line to the dip tube is paralleled to the ____________side of the dP transmitter.

[ordered_list style=”lower-alpha”]
  1. supply side of dP
  2. datum line of dP
  3. High side of dP
  4. Lo side of dP[/ordered_list]


What are your answers before you read ahead?

1. b

2. c

3. b

4. c


From the ISA Course Maintaining Pneumatic Components in Measurement and Control (TI06) pre-instructional survey.

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