NCCER INSTRUMENTATION TEST
2025/2026 COMPLETE QUESTIONS
WITH VERIFIED CORRECT SOLUTIONS
|| 100% GUARANTEED PASS
<LATEST VERSION>
1. The term used to define the distribution of I/O to different drops is known as
----- - ANSWER ✓ partitioning
2. An example of a common graphical control algorithm would be a -
ANSWER ✓ PID
3. A major function of the software server is to ----- - ANSWER ✓ store
database error files to CD-ROMS
4. A DCS is superior to a hardware alarm system because it can----- -
ANSWER ✓ provide levels of alarm severity
5. Pull boxes facilitate cable pulls through the conduit and------ - ANSWER ✓
wire trays
6. It is not good grounding practices to ----- - ANSWER ✓ ground floating
signal circuits and their shields at both the source and destination
7. As-built drawings are generated following ----- - ANSWER ✓ start- up and
construction
8. When a point is removed from scan, the dcs value ------ - ANSWER ✓
freezes
,9. Once you have determined that a bad module can be safely replaced, you
make sure that ----- - ANSWER ✓ the correct spare is available
10.The least likely element to fail in the dcs is - ANSWER ✓ a controller
11.The progranable logic control(PLC) has been used in the industry in various
forms since ----- - ANSWER ✓ 1968
12.The major hardware componets of a PLC are the processor, input module,
outputmodule, and ------ - ANSWER ✓ power supply
13.In hardwired systems, the electrons flow from the voltage source, through
the switched to the correct ---- - ANSWER ✓ indicator lamp
14.The binary number systems is a base ---- systems - ANSWER ✓ 2
15.The decimal numbering system is a base --- systems - ANSWER ✓ 10
16.The octal is a base 8 systems containing the digits ---- - ANSWER ✓ 0-7
17.A hexadecimal system is base - ANSWER ✓ 16
18.A binary code that uses represents alphanumeric characters if the ---- code -
ANSWER ✓ ASCII
19.Rotational encoders use the --- code - ANSWER ✓ gray
20.The input/output systems is the interface between the field devices and
ladder logic programmed in the ------ - ANSWER ✓ PLC memory
21.Discrete i/o modules are used for ------ interfaces - ANSWER ✓ true/false
22.I/o modules that convert varying voltage or current to a digit value or vice
versa are ----- interface - ANSWER ✓ analog
23.A special i/o module that sends out a train of pulses to a motor is a ----
module - ANSWER ✓ stepper control
,24.Which of the following modules provide a highspeed counter that is extenal
to the PLC processors ? - ANSWER ✓ encoder/ counter
25.Latge systems in which the field devices are scattered thrughout various
locations will most likely require use of ----- - ANSWER ✓ remote I/O
26.To handle communications with host coputers, printers , terminals, and other
devices most PLCs have a conventional ------ - ANSWER ✓ RS-232-
compatible
27.The front panel indicator lights on most processors are useful in ------ -
ANSWER ✓ testing programs
28.the program memory of PLC is used to store ---- - ANSWER ✓ constants
29.the two types of configuration data entered into easch processor are ---- -
ANSWER ✓ software and firm ware
30.What is the color scheme of a type K thermocouple? - ANSWER ✓ Red and
yellow
31.The five-method checks the devices output at which values - ANSWER ✓
4,8,12,16,20 mA
32.When is cleaning tubing required? - ANSWER ✓ Before installation
33.What process variable is measured with nuclear measuring device? -
ANSWER ✓ Level
34.What do we use to prevent travel damage on a limit switch? - ANSWER ✓
Mechanical stopper
35.What document should we use to verify that the correct instrument is being
used for a particular job? - ANSWER ✓ Specification Sheet
36.What electrical parameters are measured with the circuit energized? -
ANSWER ✓ Volts and Current
, 37.What electrical parameters are measured with the circuit de-energized? -
ANSWER ✓ Ohms & Continuity
38.Describe the primary control modes? - ANSWER ✓ Automatic, manual,
local and remote
39.How do strain gauges operate? - ANSWER ✓ Resistance
40.What considerations must be made before we clean an instrument or decide
what cleaning agent we will use for a particular instrument? - ANSWER ✓
Service type
41.What type of cleaning agent should we use for electronic equipment? -
ANSWER ✓ Isopropyl Alcohol
42.Why should oil based pipeline compound never be used on oxygen service
systems? - ANSWER ✓ It can cause an explosion
43.Describe a P&ID and what it is used for? - ANSWER ✓ To get a reference
of where the instrument is and its associated loop number.
44.How do we unroll soft tubing? - ANSWER ✓ At 90 degree increments
45.How much gain do you get from a 90 degree bend - ANSWER ✓ One
tubing diameter
46.What is the best way to connect cable shields? - ANSWER ✓ At one point
of the loop
47.How do we detect a pressure leak during pneumatic testing? - ANSWER ✓
With soap and water
48.What is an I/P and what is its purpose in a control loop? - ANSWER ✓ It
converts an analog signal to a pneumatic signal to control a control valve
49.Describe a reverse-acting positioner? - ANSWER ✓ If input medium
increases, output medium decreases.
2025/2026 COMPLETE QUESTIONS
WITH VERIFIED CORRECT SOLUTIONS
|| 100% GUARANTEED PASS
<LATEST VERSION>
1. The term used to define the distribution of I/O to different drops is known as
----- - ANSWER ✓ partitioning
2. An example of a common graphical control algorithm would be a -
ANSWER ✓ PID
3. A major function of the software server is to ----- - ANSWER ✓ store
database error files to CD-ROMS
4. A DCS is superior to a hardware alarm system because it can----- -
ANSWER ✓ provide levels of alarm severity
5. Pull boxes facilitate cable pulls through the conduit and------ - ANSWER ✓
wire trays
6. It is not good grounding practices to ----- - ANSWER ✓ ground floating
signal circuits and their shields at both the source and destination
7. As-built drawings are generated following ----- - ANSWER ✓ start- up and
construction
8. When a point is removed from scan, the dcs value ------ - ANSWER ✓
freezes
,9. Once you have determined that a bad module can be safely replaced, you
make sure that ----- - ANSWER ✓ the correct spare is available
10.The least likely element to fail in the dcs is - ANSWER ✓ a controller
11.The progranable logic control(PLC) has been used in the industry in various
forms since ----- - ANSWER ✓ 1968
12.The major hardware componets of a PLC are the processor, input module,
outputmodule, and ------ - ANSWER ✓ power supply
13.In hardwired systems, the electrons flow from the voltage source, through
the switched to the correct ---- - ANSWER ✓ indicator lamp
14.The binary number systems is a base ---- systems - ANSWER ✓ 2
15.The decimal numbering system is a base --- systems - ANSWER ✓ 10
16.The octal is a base 8 systems containing the digits ---- - ANSWER ✓ 0-7
17.A hexadecimal system is base - ANSWER ✓ 16
18.A binary code that uses represents alphanumeric characters if the ---- code -
ANSWER ✓ ASCII
19.Rotational encoders use the --- code - ANSWER ✓ gray
20.The input/output systems is the interface between the field devices and
ladder logic programmed in the ------ - ANSWER ✓ PLC memory
21.Discrete i/o modules are used for ------ interfaces - ANSWER ✓ true/false
22.I/o modules that convert varying voltage or current to a digit value or vice
versa are ----- interface - ANSWER ✓ analog
23.A special i/o module that sends out a train of pulses to a motor is a ----
module - ANSWER ✓ stepper control
,24.Which of the following modules provide a highspeed counter that is extenal
to the PLC processors ? - ANSWER ✓ encoder/ counter
25.Latge systems in which the field devices are scattered thrughout various
locations will most likely require use of ----- - ANSWER ✓ remote I/O
26.To handle communications with host coputers, printers , terminals, and other
devices most PLCs have a conventional ------ - ANSWER ✓ RS-232-
compatible
27.The front panel indicator lights on most processors are useful in ------ -
ANSWER ✓ testing programs
28.the program memory of PLC is used to store ---- - ANSWER ✓ constants
29.the two types of configuration data entered into easch processor are ---- -
ANSWER ✓ software and firm ware
30.What is the color scheme of a type K thermocouple? - ANSWER ✓ Red and
yellow
31.The five-method checks the devices output at which values - ANSWER ✓
4,8,12,16,20 mA
32.When is cleaning tubing required? - ANSWER ✓ Before installation
33.What process variable is measured with nuclear measuring device? -
ANSWER ✓ Level
34.What do we use to prevent travel damage on a limit switch? - ANSWER ✓
Mechanical stopper
35.What document should we use to verify that the correct instrument is being
used for a particular job? - ANSWER ✓ Specification Sheet
36.What electrical parameters are measured with the circuit energized? -
ANSWER ✓ Volts and Current
, 37.What electrical parameters are measured with the circuit de-energized? -
ANSWER ✓ Ohms & Continuity
38.Describe the primary control modes? - ANSWER ✓ Automatic, manual,
local and remote
39.How do strain gauges operate? - ANSWER ✓ Resistance
40.What considerations must be made before we clean an instrument or decide
what cleaning agent we will use for a particular instrument? - ANSWER ✓
Service type
41.What type of cleaning agent should we use for electronic equipment? -
ANSWER ✓ Isopropyl Alcohol
42.Why should oil based pipeline compound never be used on oxygen service
systems? - ANSWER ✓ It can cause an explosion
43.Describe a P&ID and what it is used for? - ANSWER ✓ To get a reference
of where the instrument is and its associated loop number.
44.How do we unroll soft tubing? - ANSWER ✓ At 90 degree increments
45.How much gain do you get from a 90 degree bend - ANSWER ✓ One
tubing diameter
46.What is the best way to connect cable shields? - ANSWER ✓ At one point
of the loop
47.How do we detect a pressure leak during pneumatic testing? - ANSWER ✓
With soap and water
48.What is an I/P and what is its purpose in a control loop? - ANSWER ✓ It
converts an analog signal to a pneumatic signal to control a control valve
49.Describe a reverse-acting positioner? - ANSWER ✓ If input medium
increases, output medium decreases.
