Instrument Tech NCCER Latest 300 Test Prep Questions
and Correct Answers/ NCCER Instrument Technician Exam
Prep 2025-2026 Correctly Answered Questions
In a parallel circuit, the voltage across any branch is equal to? - ANSWER-Source
voltage
The opposition to current flow offered by the capacitance of a circuit is known as?
- ANSWER-capacitive reactance
What is used to guard low level signals against outside interference? - ANSWER-
Shielded cable
Which of the following uses a change in voltage to measure temperature? -
ANSWER-Thermocouple
The colors of the conductors of a type J thermocouple are typically - ANSWER-
white and red
An absolute pleasure gauge reads 56.5 psia. If atmospheric pressure is 14.7 psi, the
gauge pressure reading is - ANSWER-41.8 psig
Which of the following devices is used to measure pressure? - ANSWER-bellows
The sensing element in which type of bourdon tube produces the least amount of
tip travel and torque capacity? - ANSWER-C-type
pg. 1
,Three common causes of damage to pressure measuring instruments are over
pressurization, extreme temperatures, and - ANSWER-Excessive vibration
Which of the following devices is used to measure level directly - ANSWER-Float
and cable
The operation of which level-measuring instrument involves raising and lowering
liquid inside a standpipe that contains a suspended object? - ANSWER-torque
tube displacer
The probe in a capacitance probe level-measuring instrument must be insulated if
the process fluid is - ANSWER-Conductive
An ultrasonic level-measuring device is frequently used to measure the level
of______ - ANSWER-Grain stored in silos
A pressure gauge mounted at the bottom of an open tank of water indicates 17psig.
The level of water in the tank is - ANSWER-472.222"
A device that measures level by first determining a fluid's head pressure and then
converting the pressure measurement into a corresponding level is called a -
ANSWER-Hydrostatic head device
The low pressure connection line for a bubbler system installed on a closed tank in
which the vapors from the process liquid are non-corrosive, non-plugging, and
have very low condensation factors is called a - ANSWER-Dry leg
The speed of a fluid over a given distance is called it's - ANSWER-Velocity
pg. 2
,The flow rate of a fluid moving through a pipe is proportional to the - ANSWER-
Square root of the fluids differential pressure
Which of the following is commonly used to measure flow? - ANSWER-Venturi
tube
A device that can be used to measure the flow rate of water in a river is a -
ANSWER-Pitot tube
Which type of flowmeter measures flow by producing an electronic or pneumatic
output that is proportional to the amount of deflection of a plate? - ANSWER-
Target flowmeter
Which of the following uses a float in a tapered tube to indicate flow - ANSWER-
Rotameter
An ammeter should always be connected in parallel with a load - ANSWER-False
A clamp on ammeter measures current by using the same principle as a -
ANSWER-Transformer
After you wrap 10 turns of wire around the jaws of a clamp-on ammeter and apply
power to a circuit, the ammeter indicates 10 A. How much current is flowing in the
circuit? - ANSWER-1A
The MIN/MAX or peak function of a clamp-on ammeter is useful for - ANSWER-
Checking a motors startup current
pg. 3
, What instrument drawing shows the natural representation of a process operating
sequence? - ANSWER-P&ID
Old package should be replaced with new packing which is: - ANSWER-In kind
For most tube bender radius blocks, a 90 degree bend gains approximately -
ANSWER-One tube diameter
Where are rubber gaskets used? - ANSWER-Low temperature systems/low
pressure systems
The process parameter that is selected for control in called the : - ANSWER-
Controlled variable
What is the purpose of the P&ID? - ANSWER-Shows instrument location as it
related to the process
When replacing a control valve "in kind" what is least important? - ANSWER-
Location outsignal post
Smart instrument transmitters require which of the following for calibration and
configuration - ANSWER-Communicator
What is the purpose of a I/P in a control loop - ANSWER-Converts the controllers
electrical signal to a control pressure
How many inches of WC are in 3psig? - ANSWER-83.04" wcr
pg. 4
and Correct Answers/ NCCER Instrument Technician Exam
Prep 2025-2026 Correctly Answered Questions
In a parallel circuit, the voltage across any branch is equal to? - ANSWER-Source
voltage
The opposition to current flow offered by the capacitance of a circuit is known as?
- ANSWER-capacitive reactance
What is used to guard low level signals against outside interference? - ANSWER-
Shielded cable
Which of the following uses a change in voltage to measure temperature? -
ANSWER-Thermocouple
The colors of the conductors of a type J thermocouple are typically - ANSWER-
white and red
An absolute pleasure gauge reads 56.5 psia. If atmospheric pressure is 14.7 psi, the
gauge pressure reading is - ANSWER-41.8 psig
Which of the following devices is used to measure pressure? - ANSWER-bellows
The sensing element in which type of bourdon tube produces the least amount of
tip travel and torque capacity? - ANSWER-C-type
pg. 1
,Three common causes of damage to pressure measuring instruments are over
pressurization, extreme temperatures, and - ANSWER-Excessive vibration
Which of the following devices is used to measure level directly - ANSWER-Float
and cable
The operation of which level-measuring instrument involves raising and lowering
liquid inside a standpipe that contains a suspended object? - ANSWER-torque
tube displacer
The probe in a capacitance probe level-measuring instrument must be insulated if
the process fluid is - ANSWER-Conductive
An ultrasonic level-measuring device is frequently used to measure the level
of______ - ANSWER-Grain stored in silos
A pressure gauge mounted at the bottom of an open tank of water indicates 17psig.
The level of water in the tank is - ANSWER-472.222"
A device that measures level by first determining a fluid's head pressure and then
converting the pressure measurement into a corresponding level is called a -
ANSWER-Hydrostatic head device
The low pressure connection line for a bubbler system installed on a closed tank in
which the vapors from the process liquid are non-corrosive, non-plugging, and
have very low condensation factors is called a - ANSWER-Dry leg
The speed of a fluid over a given distance is called it's - ANSWER-Velocity
pg. 2
,The flow rate of a fluid moving through a pipe is proportional to the - ANSWER-
Square root of the fluids differential pressure
Which of the following is commonly used to measure flow? - ANSWER-Venturi
tube
A device that can be used to measure the flow rate of water in a river is a -
ANSWER-Pitot tube
Which type of flowmeter measures flow by producing an electronic or pneumatic
output that is proportional to the amount of deflection of a plate? - ANSWER-
Target flowmeter
Which of the following uses a float in a tapered tube to indicate flow - ANSWER-
Rotameter
An ammeter should always be connected in parallel with a load - ANSWER-False
A clamp on ammeter measures current by using the same principle as a -
ANSWER-Transformer
After you wrap 10 turns of wire around the jaws of a clamp-on ammeter and apply
power to a circuit, the ammeter indicates 10 A. How much current is flowing in the
circuit? - ANSWER-1A
The MIN/MAX or peak function of a clamp-on ammeter is useful for - ANSWER-
Checking a motors startup current
pg. 3
, What instrument drawing shows the natural representation of a process operating
sequence? - ANSWER-P&ID
Old package should be replaced with new packing which is: - ANSWER-In kind
For most tube bender radius blocks, a 90 degree bend gains approximately -
ANSWER-One tube diameter
Where are rubber gaskets used? - ANSWER-Low temperature systems/low
pressure systems
The process parameter that is selected for control in called the : - ANSWER-
Controlled variable
What is the purpose of the P&ID? - ANSWER-Shows instrument location as it
related to the process
When replacing a control valve "in kind" what is least important? - ANSWER-
Location outsignal post
Smart instrument transmitters require which of the following for calibration and
configuration - ANSWER-Communicator
What is the purpose of a I/P in a control loop - ANSWER-Converts the controllers
electrical signal to a control pressure
How many inches of WC are in 3psig? - ANSWER-83.04" wcr
pg. 4
