1. The most frequent malfunction to be expected in a pneumatic transmitter is a __________.[ordered_list style=”lower-alpha”]
- leaking air line
- plugging of the nozzle restrictor
- power failure
- rupture of the bellows[/ordered_list]
2. A positioner is a device that:[ordered_list style=”lower-alpha”]
- positions the actuator input port to align with the pilot
- acts as a moveable diaphragm toward the output
- causes the valve stem to align with signal input
- drives the actuator relief valve negative[/ordered_list]
3. The normal pneumatic analog signal is:[ordered_list style=”lower-alpha”]
- 3 to 27 psi (20 to 180 kPa)
- 3 to 15 psi (20 to 100 kPa)
- 6 to 30 psi (40 to 200 kPa)
- 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.
- supply side of dP
- datum line of dP
- High side of dP
- Lo side of dP[/ordered_list]
What are your answers before you read ahead?
From the ISA Course Maintaining Pneumatic Components in Measurement and Control (TI06) pre-instructional survey.