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Measuring Instruments Questions and Answers PDF: We are going to cover MCQs on the same topic.
Measuring Instruments Questions and Answers PDF
What is the purpose of instrumentation in engineering?
a. To measure and control processes
b. To design mechanical structures
c. To analyze software systems
d. To develop marketing strategies
Answer: a. To measure and control processes
Which of the following is a primary sensing element in a thermocouple?
a. Strain gauge
b. Thermistor
c. Thermopile
d. Junction of dissimilar metals
Answer: d. Junction of dissimilar metals
What does the term ‘calibration’ refer to in the context of instrumentation?
a. Measuring an unknown quantity
b. Adjusting an instrument to match a standard
c. Converting analog signals to digital signals
d. Designing a new instrument
Answer: b. Adjusting an instrument to match a standard
What is the SI unit of resistance?
a. Ohm
b. Volt
c. Ampere
d. Coulomb
Answer: a. Ohm
Which instrument is used to measure voltage in a circuit?
a. Ammeter
b. Voltmeter
c. Wattmeter
d. Ohmmeter
Answer: b. Voltmeter
What is the purpose of a strain gauge?
a. Measure temperature
b. Measure pressure
c. Measure deformation or strain
d. Measure flow rate
Answer: c. Measure deformation or strain
cathode ray oscilloscope mCQ
Which type of instrument is used to measure the flow of fluids in a pipe?
a. Hydrometer
b. Manometer
c. Flowmeter
d. Barometer
Answer: c. Flowmeter
In a digital multimeter, what function does the rotary switch usually control?
a. Voltage
b. Current
c. Resistance
d. All of the above
Answer: d. All of the above
What is the purpose of a piezoelectric sensor?
a. Measure magnetic fields
b. Generate electrical power from vibrations
c. Measure humidity
d. Measure light intensity
Answer: b. Generate electrical power from vibrations
Which of the following is a type of transducer?
a. Thermocouple
b. Capacitor
c. Inductor
d. Resistor
Answer: a. Thermocouple
What is the function of a tachometer in instrumentation?
a. Measure temperature
b. Measure speed or rotational velocity
c. Measure pressure
d. Measure voltage
Answer: b. Measure speed or rotational velocity
Which instrument is commonly used to measure the intensity of light?
a. Photometer
b. Luxmeter
c. Pyrometer
d. Spectrometer
Answer: b. Luxmeter
What does the term ‘hysteresis’ refer to in the context of instrumentation?
a. Delay in the instrument response
b. Sensitivity to external interference
c. Non-linearity in the instrument output
d. Reversal of the direction of measurement
Answer: a. Delay in the instrument response
Which of the following is a unit of frequency?
a. Ampere
b. Hertz
c. Ohm
d. Newton
Answer: b. Hertz
measurement and instrumentation mCQ PDF
What is the primary function of an accelerometer?
a. Measure acceleration
b. Measure temperature
c. Measure pressure
d. Measure voltage
Answer: a. Measure acceleration
Which type of instrument is used to measure the pH of a solution?
a. Barometer
b. Manometer
c. pH meter
d. Hydrometer
Answer: c. pH meter
In a Wheatstone Bridge, what happens when the bridge is balanced?
a. The bridge becomes inoperative
b. The voltage across the bridge is zero
c. The resistance in the bridge becomes infinite
d. The bridge becomes unstable
Answer: b. The voltage across the bridge is zero
What is the primary function of an oscilloscope?
a. Measure resistance
b. Measure voltage
c. Measure temperature
d. Measure pressure
Answer: b. Measure voltage
What is the unit of measurement for capacitance?
a. Farad
b. Henry
c. Ohm
d. Volt
Answer: a. Farad
Which of the following is an example of a non-contact temperature measurement device?
a. Thermocouple
b. Thermistor
c. Pyrometer
d. Infrared thermometer
Answer: d. Infrared thermometer
What is the primary function of a Hall effect sensor?
a. Measure temperature
b. Measure magnetic fields
c. Measure pressure
d. Measure humidity
Answer: b. Measure magnetic fields
Which of the following is a passive transducer?
a. Thermocouple
b. Strain gauge
c. Piezoelectric crystal
d. LVDT (Linear Variable Differential Transformer)
Answer: b. Strain gauge
What does the term ‘resolution’ refer to in the context of measurement instruments?
a. The maximum value a sensor can measure
b. The ability of an instrument to display small changes in a measured quantity
c. The accuracy of an instrument
d. The range of values an instrument can measure
Answer: b. The ability of an instrument to display small changes in a measured quantity
Which of the following is an example of a passive instrument?
a. Voltmeter
b. Oscilloscope
c. Power meter
d. Function generator
Answer: a. Voltmeter
What is the principle behind a LVDT (Linear Variable Differential Transformer)?
a. Capacitance variation
b. Piezoelectric effect
c. Inductive coupling
d. Magnetic induction
Answer: d. Magnetic induction
What is the primary use of a pyrometer?
a. Measure humidity
b. Measure pressure
c. Measure temperature (specifically high temperatures)
d. Measure light intensity
Answer: c. Measure temperature (specifically high temperatures)
Which of the following is a type of pressure transducer?
a. Thermocouple
b. Bourdon tube
c. Photodiode
d. Accelerometer
Answer: b. Bourdon tube
What is the function of a transducer in the context of instrumentation?
a. To amplify electrical signals
b. To convert physical quantities into electrical signals
c. To regulate the flow of electrical current
d. To measure the resistance of a circuit
Answer: b. To convert physical quantities into electrical signals
Which instrument is used to measure the resistance of an electrical component?
a. Ammeter
b. Voltmeter
c. Ohmmeter
d. Wattmeter
Answer: c. Ohmmeter
What is the unit of measurement for inductance?
a. Ohm
b. Henry
c. Farad
d. Volt
Answer: b. Henry
What is the function of a transducer in the context of instrumentation?
a. To convert physical quantities into electrical signals
b. To regulate the flow of electrical current
c. To amplify electrical signals
d. To measure the resistance of a circuit
Answer: a. To convert physical quantities into electrical signals
Which type of instrument is used to measure the electric potential difference between two points in a circuit?
a. Ammeter
b. Voltmeter
c. Ohmmeter
d. Wattmeter
Answer: b. Voltmeter
What does the term ‘accuracy’ refer to in the context of measurement instruments?
a. The ability of an instrument to display small changes in a measured quantity
b. The range of values an instrument can measure
c. The closeness of a measurement to the true value
d. The maximum value a sensor can measure
Answer: c. The closeness of a measurement to the true value
In a strain gauge, what property changes in response to deformation or strain?
a. Resistance
b. Voltage
c. Capacitance
d. Frequency
Answer: a. Resistance
Which of the following is a type of level sensor used for liquid measurement?
a. Thermocouple
b. Float switch
c. Pressure transducer
d. Piezoelectric crystal
Answer: b. Float switch
What is the primary function of a wattmeter?
a. Measure voltage
b. Measure current
c. Measure power
d. Measure resistance
Answer: c. Measure power
mCQ on electrical measuring instruments with answers pdf
Which type of instrument is commonly used for measuring the atmospheric pressure?
a. Barometer
b. Hygrometer
c. Anemometer
d. Pyrometer
Answer: a. Barometer
What is the unit of measurement for frequency?
a. Hertz
b. Newton
c. Pascal
d. Watt
Answer: a. Hertz
Which of the following is a contactless method for measuring distance?
a. Dial gauge
b. Vernier caliper
c. Ultrasonic sensor
d. Laser rangefinder
Answer: d. Laser rangefinder
What is the purpose of a shunt resistor in an ammeter?
a. To measure voltage
b. To protect the ammeter from damage
c. To provide a reference voltage
d. To divert excess current away from the ammeter
Answer: d. To divert excess current away from the ammeter
What is the primary purpose of a thermistor in instrumentation?
a. Measure temperature
b. Measure pressure
c. Measure humidity
d. Measure flow rate
Answer: a. Measure temperature
Which of the following devices is used for measuring very high temperatures in industrial applications?
a. Thermocouple
b. Thermistor
c. Pyrometer
d. RTD (Resistance Temperature Detector)
Answer: c. Pyrometer
In a strain gauge, the electrical resistance changes due to:
a. Temperature fluctuations
b. Magnetic fields
c. Deformation or strain
d. Voltage variations
Answer: c. Deformation or strain
What is the primary function of a potentiometer in instrumentation?
a. Measure current
b. Measure voltage
c. Measure resistance
d. Provide a variable voltage reference
Answer: d. Provide a variable voltage reference
Which of the following is a type of displacement sensor?
a. Thermocouple
b. LVDT (Linear Variable Differential Transformer)
c. Strain gauge
d. Photodiode
Answer: b. LVDT (Linear Variable Differential Transformer)
What is the purpose of a Hall effect sensor in a rotating device?
a. Measure temperature
b. Measure speed
c. Measure pressure
d. Measure humidity
Answer: b. Measure speed
Which of the following is a type of non-electrical measurement instrument?
a. Voltmeter
b. Barometer
c. Ammeter
d. Ohmmeter
Answer: b. Barometer
What does the acronym RTD stand for in the context of temperature measurement?
a. Resistance Transformer Device
b. Real-Time Detector
c. Resistance Temperature Detector
d. Relative Temperature Device
Answer: c. Resistance Temperature Detector
What is the primary use of a chromatograph in analytical instrumentation?
a. Measure temperature
b. Analyze chemical compositions
c. Measure pressure
d. Measure flow rate
Answer: b. Analyze chemical compositions
Which instrument is used to measure the speed of an electric motor?
a. Tachometer
b. Luxmeter
c. Manometer
d. Flowmeter
Answer: a. Tachometer
What is the primary purpose of a strain gauge amplifier in a measurement system?
a. Measure temperature
b. Amplify the small signals from strain gauges
c. Measure pressure
d. Convert analog signals to digital signals
Answer: b. Amplify the small signals from strain gauges
Which of the following is a type of displacement transducer based on the variable reluctance principle?
a. LVDT (Linear Variable Differential Transformer)
b. Capacitive transducer
c. Eddy current transducer
d. Piezoelectric transducer
Answer: c. Eddy current transducer
What is the primary function of a data logger in an instrumentation system?
a. Measure voltage
b. Store and record data over time
c. Measure temperature
d. Display real-time measurements
Answer: b. Store and record data over time
In the context of temperature measurement, what is the principle behind a thermopile?
a. Variation in resistance
b. Generation of electromotive force (EMF) due to temperature difference
c. Variation in capacitance
d. Variation in inductance
Answer: b. Generation of electromotive force (EMF) due to temperature difference
Which of the following devices is used to measure the intensity of an electromagnetic field?
a. Luxmeter
b. Electrometer
c. Gaussmeter
d. Photodiode
Answer: c. Gaussmeter
What is the purpose of a transducer in a feedback control system?
a. To convert electrical signals to mechanical signals
b. To convert mechanical signals to electrical signals
c. To provide feedback to the control system
d. To amplify signals
Answer: c. To provide feedback to the control system
Which of the following is a method for measuring the flow rate of liquids using the principle of buoyancy?
a. Orifice flowmeter
b. Magnetic flowmeter
c. Coriolis flowmeter
d. Rotameter
Answer: d. Rotameter
What is the primary function of a spectrum analyzer?
a. Measure voltage
b. Measure temperature
c. Analyze frequency components in a signal
d. Measure pressure
Answer: c. Analyze frequency components in a signal
In electrical power systems, what does a synchroscope measure?
a. Voltage
b. Power factor
c. Synchronization between generators
d. Current
Answer: c. Synchronization between generators
What is the unit of measurement for luminous intensity?
a. Candela
b. Lumen
c. Lux
d. Watt
Answer: a. Candela
What is the primary function of a hygrometer?
a. Measure temperature
b. Measure pressure
c. Measure humidity
d. Measure flow rate
Answer: c. Measure humidity
In a pressure gauge, what does the term “gauge pressure” represent?
a. Atmospheric pressure
b. Pressure relative to a vacuum
c. Absolute pressure
d. Differential pressure
Answer: b. Pressure relative to a vacuum
Which of the following is an example of an active transducer?
a. Thermocouple
b. Strain gauge
c. Photodiode
d. LVDT (Linear Variable Differential Transformer)
Answer: c. Photodiode
mCQ on electrical measuring instruments with answers pdf
What is the primary function of a piezoelectric crystal in an accelerometer?
a. Measure acceleration
b. Generate electrical power from vibrations
c. Measure pressure
d. Measure temperature
Answer: a. Measure acceleration
Which instrument is commonly used to measure the resistance of a high-voltage circuit?
a. Ohmmeter
b. Megger
c. Voltmeter
d. Ammeter
Answer: b. Megger
What is the purpose of a decibel (dB) scale in measurement instruments?
a. Measure temperature
b. Quantify sound intensity or power level
c. Measure pressure
d. Quantify light intensity
Answer: b. Quantify sound intensity or power level
In a capacitive transducer, what property changes in response to the measured quantity?
a. Resistance
b. Voltage
c. Capacitance
d. Inductance
Answer: c. Capacitance
Which type of instrument is used for measuring the thickness of materials such as metal sheets?
a. Oscilloscope
b. Spectrophotometer
c. Micrometer
d. Ultrasonic thickness gauge
Answer: d. Ultrasonic thickness gauge
What is the primary purpose of an anemometer?
a. Measure temperature
b. Measure pressure
c. Measure humidity
d. Measure wind speed
Answer: d. Measure wind speed
Which of the following is a type of control valve used in industrial processes for regulating fluid flow?
a. Gate valve
b. Globe valve
c. Solenoid valve
d. Butterfly valve
Answer: d. Butterfly valve
What is the primary function of a Hall effect sensor in a magnetic field measurement system?
a. Measure temperature
b. Measure magnetic fields
c. Measure pressure
d. Measure humidity
Answer: b. Measure magnetic fields
Which type of instrument is used to measure the resistance of a component in-circuit without disconnecting it?
a. Ohmmeter
b. Voltmeter
c. Megger
d. Ammeter
Answer: c. Megger
What is the primary function of a pH meter in a laboratory setting?
a. Measure temperature
b. Measure pressure
c. Measure humidity
d. Measure acidity or alkalinity of a solution
Answer: d. Measure acidity or alkalinity of a solution
Which of the following is a non-destructive testing method used to inspect internal structures of objects using X-rays or gamma rays?
a. Spectroscopy
b. Radiography
c. Ultrasonic testing
d. Infrared thermography
Answer: b. Radiography
What is the purpose of a strain gauge bridge circuit in strain measurement applications?
a. To amplify the strain signals
b. To convert strain signals to digital signals
c. To provide a reference voltage
d. To balance and measure small changes in resistance
Answer: d. To balance and measure small changes in resistance
Which instrument is used to measure the frequency of an electrical signal?
a. Oscilloscope
b. Spectrum analyzer
c. Frequency counter
d. Signal generator
Answer: c. Frequency counter
What does the term ‘zero drift’ refer to in the context of instrumentation?
a. Gradual increase in instrument accuracy over time
b. Gradual decrease in instrument accuracy over time
c. Sudden change in instrument accuracy
d. Stability of the instrument over time
Answer: b. Gradual decrease in instrument accuracy over time
In a closed-loop control system, what is the role of a feedback sensor?
a. Measure the input signal
b. Measure the output signal
c. Provide power to the system
d. Convert digital signals to analog signals
Answer: b. Measure the output signal
Which of the following is a type of transducer commonly used in medical ultrasound imaging?
a. Thermocouple
b. Piezoelectric crystal
c. Strain gauge
d. Hall effect sensor
Answer: b. Piezoelectric crystal
What is the primary function of a Geiger-Muller counter?
a. Measure temperature
b. Measure pressure
c. Measure humidity
d. Detect and count ionizing radiation particles
Answer: d. Detect and count ionizing radiation particles
What is the primary function of a photodiode in an optical sensor system?
a. Measure temperature
b. Measure light intensity
c. Measure pressure
d. Measure humidity
Answer: b. Measure light intensity
measurement mCQ pdf
Which of the following instruments is commonly used to measure the rotational speed of a shaft in machinery?
a. Tachometer
b. Luxmeter
c. Manometer
d. Hydrometer
Answer: a. Tachometer
What is the purpose of a vernier scale in measurement instruments?
a. To provide a precise measurement
b. To amplify signals
c. To measure temperature
d. To convert analog signals to digital signals
Answer: a. To provide a precise measurement
In a gas chromatograph, what does the separation of compounds depend on?
a. Mass
b. Electrical charge
c. Boiling point
d. Molecular size
Answer: c. Boiling point
Which of the following is a type of sensor used for detecting the presence or absence of an object without physical contact?
a. Thermocouple
b. Proximity sensor
c. Accelerometer
d. Rotameter
Answer: b. Proximity sensor
What is the primary function of an inclinometer?
a. Measure temperature
b. Measure pressure
c. Measure humidity
d. Measure the angle of tilt or inclination
Answer: d. Measure the angle of tilt or inclination
measurement MCQs with answers
Which type of instrument is used to measure the speed of sound in a medium?
a. Hygrometer
b. Anemometer
c. Luxmeter
d. Sonic anemometer
Answer: d. Sonic anemometer
What is the purpose of a thermocouple compensating cable in temperature measurement systems?
a. To amplify temperature signals
b. To provide a reference voltage
c. To reduce electromagnetic interference
d. To convert analog signals to digital signals
Answer: c. To reduce electromagnetic interference
Which of the following is a method for measuring pressure by determining the deflection of a flexible membrane?
a. Strain gauge
b. Bourdon tube
c. Piezoelectric crystal
d. LVDT (Linear Variable Differential Transformer)
Answer: b. Bourdon tube
measurement mCQ pdf
What is the unit of measurement for magnetic flux?
a. Tesla
b. Weber
c. Gauss
d. Ampere
Answer: b. Weber
Which instrument is commonly used for measuring the resistance of a component without applying any external voltage?
a. Ohmmeter
b. Voltmeter
c. Ammeter
d. Wattmeter
Answer: a. Ohmmeter
In a Wheatstone Bridge circuit, what happens when the bridge is unbalanced?
a. The voltage across the bridge is zero
b. The resistance in the bridge becomes infinite
c. A non-zero voltage appears across the bridge
d. The bridge becomes unstable
Answer: c. A non-zero voltage appears across the bridge
Which of the following is a type of level sensor commonly used in liquid-level measurement applications?
a. Strain gauge
b. Float switch
c. Thermocouple
d. Photodiode
Answer: b. Float switch
What is the primary function of a pyranometer?
a. Measure temperature
b. Measure pressure
c. Measure humidity
d. Measure solar radiation
Answer: d. Measure solar radiation
Which of the following is an example of a primary standard in measurement?
a. Platinum resistance thermometer
b. Thermocouple
c. Mercury barometer
d. Strain gauge
Answer: c. Mercury barometer
What does the term ‘hysteresis’ refer to in the context of sensors and instruments?
a. The delay in the instrument response
b. The sensitivity to external interference
c. The ability to measure over a wide range
d. The non-uniformity in the output for the same input
Answer: d. The non-uniformity in the output for the same input
Which of the following instruments is commonly used for measuring the resistivity of a material?
a. Megger
b. Ohmmeter
c. Wheatstone Bridge
d. Capacitance meter
Answer: c. Wheatstone Bridge
What is the primary function of an anemometer in meteorology?
a. Measure temperature
b. Measure pressure
c. Measure humidity
d. Measure wind speed
Answer: d. Measure wind speed
Which instrument is used for measuring the concentration of gases in the atmosphere?
a. Spectrophotometer
b. Gas chromatograph
c. Mass spectrometer
d. Luxmeter
Answer: b. Gas chromatograph
In a strain gauge, how does an increase in strain affect the electrical resistance?
a. Increases resistance
b. Decreases resistance
c. Has no effect on resistance
d. Causes a complete circuit break
Answer: a. Increases resistance
measuring instruments interview questions and answers
Here are some common interview questions related to measuring instruments, along with sample answers:
1. What is the purpose of a multimeter, and how does it work?
- Answer: A multimeter is a versatile measuring instrument used to measure voltage, current, and resistance in electrical circuits. It works by using internal sensors to detect and display these electrical quantities.
2. Explain the difference between analog and digital multimeters.
- Answer: Analog multimeters use a moving needle on a scale to display measurements, while digital multimeters provide numerical readings on a digital display. Digital multimeters offer greater accuracy and precision.
3. How do you measure voltage using a multimeter?
- Answer: To measure voltage, you set the multimeter to the voltage range appropriate for the circuit, connect the probes across the component or power source, and read the displayed voltage.
4. What is continuity testing, and when is it used?
- Answer: Continuity testing checks if there is a continuous path for current flow in a circuit. It is commonly used to identify open circuits, short circuits, and to ensure proper connections in wiring.
5. What is a clamp meter, and how is it used?
- Answer: A clamp meter measures current by clamping around a conductor without the need for direct contact. It is particularly useful for measuring current in live circuits without interrupting the circuit.
6. Explain the purpose of an oscilloscope.
- Answer: An oscilloscope is used to visualize and analyze the waveform of electrical signals over time. It displays voltage variations as a graph, enabling the examination of signal frequency, amplitude, and shape.
7. How do you measure resistance using a multimeter?
- Answer: To measure resistance, set the multimeter to the resistance (ohms) range, connect the probes across the resistor, and read the displayed resistance value.
8. What is the importance of calibration in measuring instruments?
- Answer: Calibration ensures the accuracy of measuring instruments by comparing their readings to a known standard. It is crucial for reliable and precise measurements in various applications.
9. How does a thermocouple work, and where is it commonly used?
- Answer: A thermocouple consists of two dissimilar metals that generate a voltage proportional to the temperature difference between the hot and cold junctions. It is commonly used in temperature measurement applications.
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