Electrical Measurements and Instrumentation MCQs (Part-1)

What is the primary purpose of an electrical measuring instrument?

A Generate power
B Display voltage
C Store data
D Measure electrical quantities

Which device is used to measure electric current in a circuit?

A Wattmeter
B Ammeter
C Voltmeter
D Ohmmeter

What type of measuring instrument is a voltmeter?

A Voltage measuring
B Energy measuring
C Current measuring
D Power measuring

Which instrument is used to measure electrical power in a circuit?

A Ammeter
B Voltmeter
C Ohmmeter
D Wattmeter

What does an ohmmeter measure?

A Power
B Voltage
C Resistance
D Current

What is the function of a multimeter?

A Measure voltage, current, and resistance
B Amplify signals
C Measure resistance only
D Store electrical energy

Which instrument is used to measure electrical energy consumption?

A Oscilloscope
B Ammeter
C Voltmeter
D Energy meter

What does a galvanometer measure?

A Frequency
B High voltage
C Small electric current
D Electrical power

What is the main function of an oscilloscope?

A Display waveforms
B Convert AC to DC
C Generate voltage
D Measure frequency only

Which device measures the frequency of an AC signal?

A Ohmmeter
B Frequency meter
C Ammeter
D Wattmeter

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

A Step down current
B Convert DC to AC
C Measure resistance
D Step up voltage

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

A Convert AC to DC
B Measure power
C Store electrical energy
D Step down voltage

What type of error is caused by aging and wear of measuring instruments?

A Gross error
B Instrumental error
C Random error
D Environmental error

What is the principle of strain gauge measurement?

A Magnetic field
B Capacitance change
C Resistance change
D Inductance change

What is the main purpose of signal conditioning in measurements?

A Convert signals into usable form
B Increase voltage
C Store data
D Reduce resistance