TUNE YOUR LOOP: Maintaining Pneumatic Components in Measurement and Control

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 __________.

  1. leaking air line
  2. plugging of the nozzle restrictor
  3. power failure
  4. rupture of the bellows

2. A positioner is a device that:

  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

3. The normal pneumatic analog signal is:

  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)

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.

  1. supply side of dP
  2. datum line of dP
  3. High side of dP
  4. Lo side of dP

 

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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