WorksheetsRevision CEE Instrumentation Apr - Aug 2025
Total questions: 60
Worksheet time: 30mins
Which term defines the ability of a sensor to detect small changes in the input?
A. Accuracy
B. Precision
C. Sensitivity
D. Hysteresis
Which element in a measurement system directly contacts the process to produce a signal?
A. Signal Conditioner
B. Sensor
C. Display Unit
D. Actuator
What does hysteresis refer to in measurement systems?e
A. The lag in sensor output
B. The repeated accuracy
C. The delay in response
D. The output deviation with direction of input chang
Which sensor measures temperature using voltage from dissimilar metals?
A. RTD
B. Thermistor
C. Thermocouple
D. Strain Gauge
Repeatability in instruments refers to:
A. Measuring different inputs accurately
B. Same reading under same conditions at different times
C. Ability to detect errors
D. System's time delay
Which is a functional element of a measurement system?
A. Modem
B. Transmitter
C. Keyboard
D. Memory
What does dead zone refer to in sensors?
A. Maximum output
B. No change in output despite input
C. Sudden peak
D. Range beyond calibration
Which is NOT a source of error in measurement systems?
A. Environmental
B. Operational
C. Instrument Saturation
D. Calibration
What is the function of a signal conditioner?
A. To amplify and modify the sensor output
B. To display the measured value
C. To detect the physical quantity
D. To store the data
What device converts one form of energy to another?
A. Converter
B. Signal Conditioner
C. Transducer
D. Display
What is a final control element?
A. Sensor
B. Display unit
C. Controller
D. Valve or motor that changes the process
Which motor provides the highest precision?
A. Stepper motor
B. AC motor
C. Hydraulic motor
D. Pneumatic motor
Which type of actuator is known for high force and is rugged?
A. Electrical
B. Pneumatic
C. Hydraulic
D. Manual
Which control valve part adjusts the flow through the valve?
A. Actuator
B. Valve body
C. Positioner
D. Plug
Reverse acting actuators:
A. Extend on increasing pressure
B. Retract on increasing pressure
C. Do not move
D. Are manually adjusted
Which actuator uses compressed air to move the valve?
A. Electrical
B. Hydraulic
C. Pneumatic
D. Manual
A DC motor's torque is proportional to:
A. Voltage applied
B. Current in armature
C. Magnetic flux
D. Field resistance
Which valve is best suited for applications requiring tight shut-off?
A. Ball valve
B. Globe valve
C. Gate valve
D. Butterfly valve
What does an I/P converter do?
A. Converts current to voltage
B. Converts pressure to current
C. Converts current to pressure
D. Converts digital to analog
Which is NOT an application of control valves?
A. Flow control
B. Pressure control
C. Audio signal regulation
D. Temperature regulation
Dead zone refers to a sudden change in output with a small input.
TRUE
FALSE
Sensors always produce digital signals.
TRUE
FALSE
Calibration is used to define the response time of an instrument.
TRUE
FALSE
Repeatability refers to the ability to measure different values accurately.
TRUE
FALSE
Precision is how close the measured values are to each other.
TRUE
FALSE
Motors are not used as final control elements.
TRUE
FALSE
Electric actuators are generally noisier than pneumatic actuators.
TRUE
FALSE
Pneumatic actuators use compressed air to operate.
TRUE
FALSE
Reverse-acting actuators retract with decreasing pressure.
TRUE
FALSE
A control valve is a final control element.
TRUE
FALSE
What is the term to explain the variation in repetitive measurements of the same quantity under identical conditions?
A. Precision
B. Resolution
C. Accuracy
D. Sensitivity
Which of the following statements is TRUE about the resolution of an instrument?
A. It indicates the degree of closeness to the true value.
B. It is the ability to make fine distinctions between measurements.
C. It refers to the stability of the instrument over time.
D. It is not affected by calibration errors.
What is the primary purpose of using redundancy in instrumentation systems?
A. Increase precision
B. Enhance sensitivity
C. Reduce sources of error
D. Improve resolution
Which parameter does a strain gauge primarily measure?
A. Temperature
B. Pressure
C. Displacement
D. Light intensity
What is the role of a potentiometer in a sensing element?
A. Measure temperature
B. Measure pressure
C. Measure displacement
D. Measure voltage
Which of the following is a characteristic of a good sensing element?
A. High cost
B. Low sensitivity
C. High linearity
D. Poor stability
In signal conditioning, what does the term "amplification" refer to?
A. Increasing the signal strength
B. Reducing the signal strength
C. Converting analog to digital signal
D. Filtering out noise
Which of the following is a common type of signal conditioning for improving signal-to-noise ratio?
A. Demodulation
B. Modulation
C. Filtering
D. Amplification
Which signal converter is used to convert digital signals back to analog signals in signal conditioning?
A. A/D Converter
B. D/A Converter
C. Frequency-to-Voltage Converter
D. Voltage-to-Frequency Converter
Which of the following is a type of display unit that is sensitive to both AC and DC currents?
A. Timer/Counter
B. LED Bargraph Display
C. Moving Coil Meter
D. Digital Display
What is the main advantage of using an LED Bargraph Display in an instrumentation system?
A. High precision
B. Fast response time
C. Visual indication of changing values
D. Compatibility with digital signals
What is the purpose of using a moving coil meter in an instrumentation system?
A. Measure time intervals
B. Indicate rapidly changing values
C. Display analog signals
D. Convert physical quantity to electrical signal
Which of the following is a key parameter to evaluate during the maintenance of a measurement system?
A. Signal frequency
B. Sensitivity
C. Power consumption
D. Temperature range
Why is it essential to evaluate performance parameters regularly in an instrumentation system?
A. To increase calibration frequency
B. To detect and correct issues early
C. To decrease maintenance costs
D. To eliminate sources of random error
What is the primary goal of a calibration procedure in maintenance?
A. Identify sources of error
B. Improve measurement precision
C. Establish a reference scale for measurements
D. Increase sensitivity
In a control system, what is the function of the Final Control Element concerning the manipulated variable?
A. Measure the variable
B. Transmit the variable
C. Change the variable
D. Record the variable
Which type of actuator is commonly used in control valves to regulate fluid flow?
A. Pneumatic actuator
B. Hydraulic actuator
C. Electric actuator
D. Magnetic actuator
What is the significance of the dead time in the context of Final Control Elements?
A. Time delay in signal transmission
B. Time taken for the actuator to respond
C. Time interval without a change in the manipulated variable
D. Time required for calibration
In a regulating unit, what does the term "hysteresis" refer to?
A. Dead time in the control process
B. Non-linearity in the response of the actuator
C. Oscillation in the system output
D. Variation in gain over time
What is the primary purpose of the proportional band in a regulating unit?
A. Control dead time
B. Prevent hysteresis
C. Adjust sensitivity
D. Limit oscillations
A transducer in a sensing element converts electrical signals to physical quantities.
TRUE
FALSE
A strain gauge primarily measures temperature
TRUE
FALSE
Filtering is a common type of signal conditioning for improving signal-to-noise ratio.
TRUE
FALSE
Frequency-to-Voltage Converter is used to convert frequency to current in signal conditioning.
TRUE
FALSE
Digital Display is an example of a display unit that provides a continuous visual representation of changing quantities.
TRUE
FALSE
A counter is used to count the number of errors in a display unit.
TRUE
FALSE
Zeroing during maintenance involves eliminating all sources of error.
TRUE
FALSE
Regularly updating system software is a common step in the testing procedure during maintenance.
TRUE
FALSE
The function of the Final Control Element concerning the manipulated variable is to measure it.
TRUE
FALSE
Speed of response in Final Control Elements refers to the ability to respond quickly to changes in the control signal.
TRUE
FALSE
