Electrical Measurements and Instrumentation MCQs (Part-6)

What does an analog voltmeter measure?

A Electric current
B Voltage
C Power
D Resistance

Which of the following is used to measure the rotational speed of a machine?

A Oscilloscope
B Tachometer
C Wattmeter
D Thermistor

What is the function of an instrument transformer?

A To measure power directly
B To measure very high voltage or current safely
C To amplify electrical signals
D To reduce resistance

Which instrument is used to measure the phase difference between two AC signals?

A Ammeter
B Phase meter
C Voltmeter
D Wattmeter

What is the basic principle of an LVDT?

A Variation in capacitance
B Variation in inductance
C Piezoelectric effect
D Resistance change

Which type of error is caused by imperfections in instrument construction?

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

What is the function of a dynamometer-type wattmeter?

A To measure energy directly
B To measure average power
C To measure instantaneous power
D To measure current

What does the term “sensitivity” of a measuring instrument mean?

A The ability to detect small changes in input
B The maximum value it can measure
C The ability to reduce noise
D The speed of measurement

Which type of noise can be minimized using low-pass filters?

A Thermal noise
B High-frequency noise
C Electromagnetic interference
D Shot noise

What is the primary function of a Wheatstone bridge?

A To measure resistance
B To measure capacitance
C To measure inductance
D To measure voltage

What is the main purpose of a load cell?

A To measure temperature
B To measure weight or force
C To measure pressure
D To measure current

Which property of a material is measured using a strain gauge?

A Electrical resistance
B Deformation (strain)
C Capacitance
D Thermal conductivity

Which transducer operates on the piezoelectric principle?

A Thermocouple
B Piezoelectric sensor
C LVDT
D Strain gauge

What type of error arises from human mistakes during measurement?

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

What is the main principle of a thermistor?

A Capacitance variation
B Resistance variation with temperature
C Magnetic field induction
D Piezoelectric effect

What is the function of a frequency counter?

A To measure voltage
B To measure the frequency of an electrical signal
C To measure current
D To measure resistance

Which sensor is used for flow measurement?

A Strain gauge
B Venturi meter
C Tachometer
D Thermistor

What is the purpose of calibration?

A To increase the sensitivity of an instrument
B To ensure accuracy by comparing with a standard
C To reduce noise in measurements
D To extend the range of measurement

Which type of transducer is used for pressure measurement?

A Capacitive transducer
B Thermocouple
C Tachometer
D Multimeter

Which error type is minimized by proper shielding in electrical instruments?

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