Page 1 of 154
Instrumentation NCCER EXAM 1-2 ALL 500
QUESTIONS AND VERIFIED SOLUTIONS
LATEST UPDATE THIS YEAR
Instrumentation NCCER
QUESTION: If 75 volt DC potential is applied to a 25ohm load, the circuit current is:
A. 0.3 amps
B. 3.0 amps
C. 30 amps
D. 300 milliamps - ANSWER-B. 3.0 amps
QUESTION: A valve has linear-fow characteristics when the:
A. Flow corresponds directly to the valve stem position
B. Differential pressure corresponds directly to the valve stem position
C. Flow is high enough to retract the valve stem
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D. Flow does not pass through control loops - ANSWER-B. Differential pressure corresponds
directly to the valve stem position
QUESTION: What is a circuit current if 45VDC is applied to a 250ohm load?
A. 0.18 amp
B. 0.25 amp
C. 0.50 amp
D . 1.8 amp - ANSWER-A. 0.18 amp
QUESTION: All of the following valves are used to regulate flow EXCEPT:
A. Ball
B. Butterfly
C. Needle
D. Gate - ANSWER-D. Gate
QUESTION: The value of the dynamic variable desired in a process is the:
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A. Signal
B. Set point
C. Resolution
D. Specific gravity - ANSWER-B. Set point
QUESTION: An acceptable tool for marking 360 degrees around the outside of tubing is a:
A. Laser level
B. Rubber band
C. String
D. Ferrule - ANSWER-D. Ferrule
When is the BEST time to document each loop check for commissioning?
A. Prior to the start of inspection
B. When updating information on a daily basis
C. At the time each test is complete - ANSWER-C. At the time each test is complete
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QUESTION: Teflon paste must not be used on :
A. Nitrogen service
B. Natural gas service
C. Oxygen service - ANSWER-A. Nitrogen service
QUESTION: A 24VDC power supply is not working. With your multimeter you verify no DC
voltage. On the 120VAG input you measure 120V between hot and ground, and 72V between
hot and neutral. What is the most likely cause
of this?
A. Lost the ground
B.Lost the hot
C. Lost the neutral
D. Lost the fuse - ANSWER-C. Lost the neautral
QUESTION: Gain increase when tube:
A. Back bends are made
4
Instrumentation NCCER EXAM 1-2 ALL 500
QUESTIONS AND VERIFIED SOLUTIONS
LATEST UPDATE THIS YEAR
Instrumentation NCCER
QUESTION: If 75 volt DC potential is applied to a 25ohm load, the circuit current is:
A. 0.3 amps
B. 3.0 amps
C. 30 amps
D. 300 milliamps - ANSWER-B. 3.0 amps
QUESTION: A valve has linear-fow characteristics when the:
A. Flow corresponds directly to the valve stem position
B. Differential pressure corresponds directly to the valve stem position
C. Flow is high enough to retract the valve stem
1
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D. Flow does not pass through control loops - ANSWER-B. Differential pressure corresponds
directly to the valve stem position
QUESTION: What is a circuit current if 45VDC is applied to a 250ohm load?
A. 0.18 amp
B. 0.25 amp
C. 0.50 amp
D . 1.8 amp - ANSWER-A. 0.18 amp
QUESTION: All of the following valves are used to regulate flow EXCEPT:
A. Ball
B. Butterfly
C. Needle
D. Gate - ANSWER-D. Gate
QUESTION: The value of the dynamic variable desired in a process is the:
2
, Page 3 of 154
A. Signal
B. Set point
C. Resolution
D. Specific gravity - ANSWER-B. Set point
QUESTION: An acceptable tool for marking 360 degrees around the outside of tubing is a:
A. Laser level
B. Rubber band
C. String
D. Ferrule - ANSWER-D. Ferrule
When is the BEST time to document each loop check for commissioning?
A. Prior to the start of inspection
B. When updating information on a daily basis
C. At the time each test is complete - ANSWER-C. At the time each test is complete
3
, Page 4 of 154
QUESTION: Teflon paste must not be used on :
A. Nitrogen service
B. Natural gas service
C. Oxygen service - ANSWER-A. Nitrogen service
QUESTION: A 24VDC power supply is not working. With your multimeter you verify no DC
voltage. On the 120VAG input you measure 120V between hot and ground, and 72V between
hot and neutral. What is the most likely cause
of this?
A. Lost the ground
B.Lost the hot
C. Lost the neutral
D. Lost the fuse - ANSWER-C. Lost the neautral
QUESTION: Gain increase when tube:
A. Back bends are made
4
