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WorksheetsICM 803 Revision 2025 (Part 1)
Total questions: 40
Worksheet time: 20mins
A calibration certificate verifies:
Operator attendance
Tax compliance
Electrical safety only
Instrument accuracy after calibration
In a parallel circuit, voltage across each branch is:
zero
Different for each branch
Twice the source voltage
Same as the voltage source
The key purpose of a P&ID is to:
Display architectural drawings
Illustrate company organization
Show process piping and instrumentation details
Design electric motors
P&IDs are used mainly to:
Design electrical circuits only
Provide details of piping and control instrumentation
Test laboratory samples
Build computer programs
A common term for the difference between actual value and indicated value is:
drift
error
span
lag
In an ISA tag, the first letter identifies:
Location of the device
Loop number
Process variable
Pipe size
A tag such as PT-101 represents a:
Power transformer
Pressure transmitter
Pressure tank
Pneumatic timer
The term “setpoint” means:
The lowest signal range
The desired value of a process variable
The actual reading from the sensor
The voltage of a circuit
One advantage of pneumatic system is:
High flammability
Requires no compressor
Safety in explosive environments
Zero maintenance
In ISA symbols, a dashed line usually indicates:
Pneumatic line
Hydraulic line
Electrical connection
Mechanical connection
A control system that operates without feedback is called:
Closed loop
Open loop
Feedback loop
Proportional loop
Zero adjust during calibration ensures:
Output is correct at lowest input
Pressure is maximum
Signal is disconnected
Controller is bypassed
The letter “T” in ISA identification usually stands for:
Temperature
Torque
Timing
Tencion
Loop diagrams show:
Complete wiring of a single control loop
Only piping connections
Plant layout
Safety protocols
The standard pneumatic signal range is:
0-10 psi
3-15 psi
4-20 psi
1-5 psi
The purpose of automation in control systems is to:
Increase manual labor
Reduce accuracy
Improve efficiency and precision
Increase cost
In instrumentation, the device that measures a physical quantity is called a:
transmitter
sensor
converter
relay
An actuator in a P&ID controls:
Manual operation
Electric current
Movement of valves
Display reading
Length can be measured using a:
Voltmeter
Ruler or caliper
Flow tube
Thermistor
In a feedback control system, feedback is:
The input to the process
A manual correction
A set point
Output returned to compare with input
Calibration ensures that instruments:
Are lightweight
Provide accurate readings
Are visually appealing
Have new batteries
Precision is:
Closeness among repeated readings
Closeness to actual value
Average value
Highest reading
Pneumatics is the use of:
Hydraulic fluid
Electric current
Steam
Air pressure for mechanical motion
The process variable is:
The measured condition of the process
The desired output
The electrical signal
The set point
If voltage increases and resistance is constant, current:
Decreases
Increases
Stays the same
Becomes zero
The dashed line connecting instruments indicates:
Electrical signal
Hydraulic power
Pneumatic control
Manual operation
The pressure unit used in pneumatics is:
Volt
Ampere
Bar or psi
Ohm
A tag “PT” means:
Pressure Transmitter
Power Transformer
Pneumatic Tube
Process Tank
The controller’s job is to:
Record data
Display values
Adjust output to correct deviation
Cool down the process
Calibration is the process of:
Painting instruments
Installing devices
Adjusting instrument accuracy using a standard
Replacing components
The "live zero" for pneumatic transmission.
2 Kpa
0 Kpa
4 mA
20 Kpa
This type of cylinder drives the rod back and forth, allowing a push-pull load motion.
Single-acting cylinder
Non-acting cylinder
double-acting cylinder
Action cylinder
This type of cylinder use a return spring with only the outstroke moving the load.
Single-acting cylinder
Double-acting cylinder
Action cylinder
Gas cylinder
It refers to the capability of the instrument. It is often the nameplate rating of the instrument.
Instrument Range
Ranging an instrument
Calibration
Ranging
In instrument symbols, what does the second letter in the coding indicates?
the type of instrument
the manufacturer of the instrument
the function of instrument
the location of the instrument
In this type of calibration, the instrument is not removed from the process.
Field calibration
In-shop calibration
Bench calibration
Five point calibration
Remove moisture and contamination particles from the compressed air systems.
Regulator
Compressor
Air filter
Receiver
Which of the following adjustments is usually adjusted first in an instrument requiring calibration?
Zero
Span
Hysteresis
Linearity
The region between the limits within which a variable is measured.
Span
Range
Elevation
Depression
The "live zero" for an electronic transmission is equal to;
4 A
40 mA
4 mA
40 A
