Electrical Measurements and Instrumentation MCQs (Part-12)

What is the primary function of a multimeter?

A Measure power
B Measure multiple electrical quantities like voltage, current, and resistance
C Measure temperature
D Measure torque

Which of the following bridges is used to measure low resistance?

A Maxwell bridge
B Kelvin bridge
C Wheatstone bridge
D Schering bridge

What is the primary application of a galvanometer?

A Measure high currents
B Detect and measure small currents
C Measure frequency
D Measure power

What is the working principle of a thermocouple?

A Electromagnetic induction
B Seebeck effect
C Piezoelectric effect
D Capacitance variation

Which device is used to measure the electrical power of a circuit?

A Ammeter
B Wattmeter
C Energy meter
D Multimeter

What is the unit of electrical power measured by a wattmeter?

A Amperes
B Volts
C Watts
D Ohms

What does a digital multimeter measure?

A Only current
B Voltage, current, and resistance
C Only resistance
D Frequency only

What is the function of a frequency meter?

A Measure power
B Measure frequency of an electrical signal
C Measure voltage
D Measure capacitance

What is the purpose of a current transformer (CT)?

A To step down current for safe measurement
B To step up current for transmission
C To measure voltage
D To store electrical energy

What is the function of a potential transformer (PT)?

A Step up voltage for transmission
B Step down voltage for measurement
C Measure current
D Amplify power

What is the unit of frequency in a frequency meter?

A Amperes
B Volts
C Hertz (Hz)
D Ohms

What is the main function of a Kelvin bridge?

A Measure low resistance accurately
B Measure inductance
C Measure capacitance
D Measure power

What is the main principle used by a Hall effect sensor?

A Voltage induced by a magnetic field
B Current induced by voltage
C Resistance change with strain
D Capacitance change with temperature

What is the purpose of using a Venturi meter?

A Measure fluid flow rate
B Measure pressure
C Measure temperature
D Measure voltage

What type of instrument is used to measure small displacements?

A Thermocouple
B LVDT (Linear Variable Differential Transformer)
C Pressure sensor
D Galvanometer

What is the primary function of a piezoelectric sensor?

A Measure temperature changes
B Convert mechanical stress into electrical energy
C Measure voltage changes
D Measure electric current

What does a calibration process ensure in a measuring instrument?

A Increase the accuracy of the instrument
B Ensure that the instrument provides accurate and reliable measurements
C Reduce the size of the instrument
D Improve the signal processing speed

What does an oscilloscope primarily measure?

A Voltage waveforms over time
B Current fluctuations
C Frequency response
D Electrical power consumption

Which of the following instruments is used to measure very high resistance?

A Ammeter
B Megger
C Voltmeter
D Multimeter

What is the purpose of shielding in electrical measurement systems?

A Reduce electromagnetic interference (EMI)
B Increase signal strength
C Improve accuracy of instruments
D Convert AC to DC