5/21/25, 6:14 AM
NCCER INSTRUMENTATION (MECHANICAL ENGINEERING)
COMPREHENSIVE EXAM 2025/2026 NEWEST!! ACTUAL EXAM
COMPLETE QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) ALREADY GRADED A+.
What (2) factors determine C. The height of the level and the specific gravity
the static head pressure
close to the bottom of a
tank?
A. The acidity or alkalinity of
the liquid
B. The height of the level and
the turbidity
C. The height of the level
and the specific gravity
D .The specific gravity and the
viscosity
A transmitter with an RTD is D. DC voltage and resistance
not working.
Using the multimeter,
which two parameters will
help the best with
troubleshooting?
A .AC Voltage and milivolts
B .DC Voltage and milivolts
C.AC voltage and resistance
D. DC voltage and resistance
What part of an C. Materials list
instrumentation installation
drawing lists the REQUIRED
fittings?
A. Instrument
index B .
Title block
C. Materials list
1/49
,5/21/25, 6:14 AM
D. Legend
Solve using the equation: A. 5.48in/Hg
Absolute vacuum pressure=
barometric pressure-
vacuum gauge reading. Given
that a vacuum gauge reads
22.2inHg, and the
barometric
pressure reads 27.68, find
the absolute pressure.
A. 5.48in/Hg
B. 14.7in/Hg
C. 29.85 in/Hg
D. 49.88in/Hg
A severe shock is affected by: A. Amount of current in body
A. Amount of current in body
B. Size of person
C. Size of wire
D. Number of wires
A float switch is used to B. Contacts are welded closed
control a sump pump. The
pump motor continues to
run
after the sump pump is
empty. What would cause
the pump motor to
continue
running?
A. Contacts are wedled open
B. Contacts are welded closed
C. The pump suction line is
pulsed
D. The supply voltage to the
switch is too low
2/49
,5/21/25, 6:14 AM
The types of gaskets and A. A section of the specifications
gasket materials to be used
on a project are listen in:
A. A section of the
specifications
B. The instrument index
C. A loop drawing
D. An isometric drawing
The preferred medium to B. Air
remove debris from a new
instrument airline prior to
service is:
A . Water
B. Air
C. Alcohol
D. Dilute Caustic
A strain gauge measures the B. Resistance
external force applied to a
fine wire by causing a
change in:
A. Temperature
B. Resistance
C. Capacitance
D. Inductance
Which of the folowing D. Oxygen
purging gases should be
avoided for use with
hydrocarbons?
A. Air
B. Nitrogen
C. Carbon dioxide
D. Oxygen
A differential pressure C. Density of the product in the vessel
transmitter mounted on a
non-vented vessel is used to
measure the:
A. Level of the product in the
vessel
B. Rate of flow of product out
the vessel
C. Density of the product in
the vessel
3/49
, 5/21/25, 6:14 AM
D. Rate off low of product into
the vessel
Convert the length 2'10-3/4" B. 2.896'
to its decimal equivalent
(infeet).
A. 2.750'
B. 2.896'
C. 2.910'
D. 2.950'
Flow can be described in B. Density
units of all of the folowing
EXCEPT.
A . Volume
B. Density
C. Mass
D. velocity
When an 8 mA signal is B. 2 volts
connected across a 250 ohm
resistor, the voltage drop
across the resistor would
be:
A. 1 volt
B. 2 volts
C. 3volts
D. 4volts
PTFE tape used as a sealant A. In the same direction as the threads
should be wrapped:
A. In the same direction as the
threads
B. In the opposite direction of
the threads
C. In either direction
D. 1⁄4inch past the threads
Whats is a common A .Desiccant
material used to minimize
moisture in the
instrumentation? A
4/49
NCCER INSTRUMENTATION (MECHANICAL ENGINEERING)
COMPREHENSIVE EXAM 2025/2026 NEWEST!! ACTUAL EXAM
COMPLETE QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) ALREADY GRADED A+.
What (2) factors determine C. The height of the level and the specific gravity
the static head pressure
close to the bottom of a
tank?
A. The acidity or alkalinity of
the liquid
B. The height of the level and
the turbidity
C. The height of the level
and the specific gravity
D .The specific gravity and the
viscosity
A transmitter with an RTD is D. DC voltage and resistance
not working.
Using the multimeter,
which two parameters will
help the best with
troubleshooting?
A .AC Voltage and milivolts
B .DC Voltage and milivolts
C.AC voltage and resistance
D. DC voltage and resistance
What part of an C. Materials list
instrumentation installation
drawing lists the REQUIRED
fittings?
A. Instrument
index B .
Title block
C. Materials list
1/49
,5/21/25, 6:14 AM
D. Legend
Solve using the equation: A. 5.48in/Hg
Absolute vacuum pressure=
barometric pressure-
vacuum gauge reading. Given
that a vacuum gauge reads
22.2inHg, and the
barometric
pressure reads 27.68, find
the absolute pressure.
A. 5.48in/Hg
B. 14.7in/Hg
C. 29.85 in/Hg
D. 49.88in/Hg
A severe shock is affected by: A. Amount of current in body
A. Amount of current in body
B. Size of person
C. Size of wire
D. Number of wires
A float switch is used to B. Contacts are welded closed
control a sump pump. The
pump motor continues to
run
after the sump pump is
empty. What would cause
the pump motor to
continue
running?
A. Contacts are wedled open
B. Contacts are welded closed
C. The pump suction line is
pulsed
D. The supply voltage to the
switch is too low
2/49
,5/21/25, 6:14 AM
The types of gaskets and A. A section of the specifications
gasket materials to be used
on a project are listen in:
A. A section of the
specifications
B. The instrument index
C. A loop drawing
D. An isometric drawing
The preferred medium to B. Air
remove debris from a new
instrument airline prior to
service is:
A . Water
B. Air
C. Alcohol
D. Dilute Caustic
A strain gauge measures the B. Resistance
external force applied to a
fine wire by causing a
change in:
A. Temperature
B. Resistance
C. Capacitance
D. Inductance
Which of the folowing D. Oxygen
purging gases should be
avoided for use with
hydrocarbons?
A. Air
B. Nitrogen
C. Carbon dioxide
D. Oxygen
A differential pressure C. Density of the product in the vessel
transmitter mounted on a
non-vented vessel is used to
measure the:
A. Level of the product in the
vessel
B. Rate of flow of product out
the vessel
C. Density of the product in
the vessel
3/49
, 5/21/25, 6:14 AM
D. Rate off low of product into
the vessel
Convert the length 2'10-3/4" B. 2.896'
to its decimal equivalent
(infeet).
A. 2.750'
B. 2.896'
C. 2.910'
D. 2.950'
Flow can be described in B. Density
units of all of the folowing
EXCEPT.
A . Volume
B. Density
C. Mass
D. velocity
When an 8 mA signal is B. 2 volts
connected across a 250 ohm
resistor, the voltage drop
across the resistor would
be:
A. 1 volt
B. 2 volts
C. 3volts
D. 4volts
PTFE tape used as a sealant A. In the same direction as the threads
should be wrapped:
A. In the same direction as the
threads
B. In the opposite direction of
the threads
C. In either direction
D. 1⁄4inch past the threads
Whats is a common A .Desiccant
material used to minimize
moisture in the
instrumentation? A
4/49
