Electrical Measurements and Instrumentation MCQs (Part-10)

What is accuracy in electrical measurements?

A Consistency of results
B Repeatability of measurements
C Closeness to true value
D Ability to measure small values

What does precision refer to in measurements?

A Ability to repeat results
B Closeness to true value
C Ability to measure large values
D Sensitivity of the instrument

What is the main difference between accuracy and precision?

A Accuracy measures the repeatability of results
B Accuracy measures how close a result is to the true value
C Precision measures how close a result is to the true value
D Precision is the ability to measure small values

What is a common source of error in electrical measurements?

A Instrument failure
B Environmental conditions
C Human error
D All of the above

How can instrument calibration improve measurement accuracy?

A Reduces signal noise
B Increases sensitivity
C Ensures correct scaling of measurements
D Reduces environmental impact

What is the role of an ammeter in an electrical circuit?

A Measure current
B Measure voltage
C Measure power
D Measure resistance

Which instrument measures the power consumption in an electrical circuit?

A Ohmmeter
B Ammeter
C Wattmeter
D Voltmeter

What is the main purpose of an ohmmeter?

A Measure voltage
B Measure resistance
C Measure current
D Measure power

How does an oscilloscope display a signal?

A By showing the voltage versus time
B By measuring the current
C By showing resistance values
D By measuring power

What does a transducer do in a measurement system?

A Amplifies signals
B Filters unwanted signals
C Converts physical quantities into electrical signals
D Measures electrical power

What type of error occurs when there is a mistake in instrument reading or operation?

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

What does a strain gauge measure in a material?

A Voltage
B Strain
C Pressure
D Displacement

What is the main purpose of a precision resistor in a measurement system?

A Measure current
B Provide accurate voltage
C Set a known resistance value
D Measure power

What is the main principle of operation for a galvanometer?

A Temperature change
B Resistance change
C Capacitive effect
D Magnetic deflection of a needle

How can errors in electrical measurements be minimized?

A Using high quality instruments
B Regular calibration
C Proper environmental control
D All of the above