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Instrumentation and Commissioning Basics
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Instrumentation and Commissioning Basics
Instrumentation and Commissioning Basics
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1
Question
When is the BEST time to document each loop check for commissioning?
Answer
At the time each test is completed
2
Question
Teflon paste must not be used on which service?
Answer
Oxygen service
3
Question
A 24VDC power supply not working; 120VAC input reads 120V hot-ground and 72V hot-neutral. Likely cause?
Answer
Lost the neutral
4
Question
A pressure piping code is found in which document?
Answer
ANSI B31.1
5
Question
Preferred method for marking tubing to cut is:
Answer
Mark with a felt tip pen
6
Question
An example of a direct measurement indicator is a:
Answer
Sight glass
7
Question
What is the first step in troubleshooting a system problem?
Answer
Verify that there is a problem
8
Question
Where can the appropriate elevation of an instrument be found?
Answer
Location drawing
9
Question
When making a 90-degree tubing bend, springback allowance should be:
Answer
1 to 3 degrees
10
Question
Cable shields should be connected to the:
Answer
Ground at each accessible location
11
Question
An employee de-energizes equipment by unplugging, but continues to hold the plug. What type of control is this?
Answer
Exclusive control
12
Question
If a compressor keeps blowing a PSV, what should a technician check first?
Answer
Pressure switch deadband
13
Question
A heat reactive dryer producing damp instrument air; simplest fix is to:
Answer
Adjust the cycle time
14
Question
Type J thermocouple extension wire is:
Answer
White & red
15
Question
Which gas should purge tubing after cleaning?
Answer
Nitrogen
16
Question
When pressure testing, the required documentation includes:
Answer
Temperature, pressure, and test medium
17
Question
An air-to-open valve uses a:
Answer
Spring-to-close Actuator
18
Question
Most common method to measure liquid flow in a pipe is to introduce a restriction and measure the:
Answer
Velocity
19
Question
After a bend is completed, all tubing will exhibit:
Answer
Springback
20
Question
Which valve REQUIRES a 90-degree turn to be fully open or closed?
Answer
Ball valve
21
Question
Where is the drain wire terminated in an instrument system?
Answer
At the control cabinet
22
Question
A test performed on piping to check for leaks is a:
Answer
Hydrostatic test
23
Question
For temperatures >1500°F, a common gasket material is:
Answer
Ceramic
24
Question
All of the following are typically applications of photocells except:
Answer
Battery charging
25
Question
The positive wire color on a type K extension wire is:
Answer
Yellow
26
Question
Type K thermocouple wire is:
Answer
Yellow & Red
27
Question
Most electrical shock fatalities are caused by:
Answer
Contact with live conductors (electric shock)
28
Question
What is density?
Answer
The ratio of a substance to the weight of an equal volume of air at a given T and P
29
Question
Which is a final control element in an instrument loop?
Answer
Output signal
30
Question
Flow measurement is determined by fluid oscillations in which type of flow meter?
Answer
Vortex flow meter