Electrical Measurements and Instrumentation MCQs (Part-9)

What is the primary function of a dynamometer-type wattmeter?

A Measure energy
B Measure average power in AC and DC circuits
C Measure instantaneous power
D Measure voltage

What is the working principle of an energy meter?

A Piezoelectric effect
B Electromagnetic induction
C Magnetic deflection
D Electrostatic attraction

Which type of transducer converts pressure into an electrical signal?

A Thermocouple
B Piezoelectric transducer
C LVDT
D Strain gauge

What is the typical range of a household energy meter?

A 0–100 kWh
B 0–1,000 kWh
C 0–10,000 kWh
D 0–50,000 kWh

Which instrument measures the angular velocity of a rotating shaft?

A Tachometer
B Multimeter
C Frequency meter
D Galvanometer

What is the purpose of an Anderson bridge?

A Measure capacitance
B Measure inductance
C Measure resistance
D Measure voltage

What type of error arises due to drift in the components of an instrument?

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

Which transducer is best for displacement measurement?

A Strain gauge
B Thermistor
C LVDT
D Tachometer

What does a phase meter measure?

A Voltage
B Frequency
C Phase angle between two AC signals
D Current

What is the principle of operation of a Hall-effect sensor?

A Electromagnetic induction
B Voltage induced by magnetic field
C Current-induced magnetic field
D Resistance change due to strain

What does a Kelvin bridge measure?

A Low resistance
B High resistance
C Inductance
D Capacitance

What does a potentiometer measure?

A Voltage
B Current
C Resistance
D Capacitance

Which sensor uses the Seebeck effect?

A Thermistor
B Thermocouple
C Piezoelectric sensor
D Strain gauge

What is the typical unit of frequency measured by a frequency meter?

A Joules
B Ohms
C Hertz
D Watts

What type of error occurs due to external electromagnetic interference?

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

What is the primary purpose of a signal conditioner?

A Store data
B Amplify and filter signals
C Measure resistance
D Display data

What is the purpose of a Schering bridge?

A Measure resistance
B Measure capacitance
C Measure inductance
D Measure voltage

What does an oscilloscope primarily measure?

A Displacement
B Voltage waveform over time
C Pressure changes
D Temperature variations

What is the purpose of damping in measuring instruments?

A Reduce sensitivity
B Stabilize the pointer and reduce oscillations
C Amplify the signal
D Increase range

Which type of transformer is used in metering systems?

A Distribution transformer
B Power transformer
C Instrument transformer
D Auto transformer