Electrical Measurements and Instrumentation MCQs (Part-4)

Which principle does an ammeter use to measure current?

A Ohm’s Law
B Faraday’s Law of Electromagnetic Induction
C Ampere’s Circuital Law
D Kirchhoff’s Voltage Law

What is the purpose of damping in measuring instruments?

A To increase sensitivity
B To reduce oscillations
C To amplify signals
D To measure errors

Which type of error occurs due to wear and tear of instrument parts?

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

What is the main application of a thermistor in electrical measurements?

A Voltage measurement
B Current measurement
C Temperature measurement
D Displacement measurement

Which bridge is commonly used for capacitance measurement?

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

What is the unit of measurement for the sensitivity of a galvanometer?

A Ampere
B Volt
C Ohm
D Microampere per division

What does a potentiometer measure?

A Current
B Voltage
C Power
D Frequency

Which of the following is an active transducer?

A Thermocouple
B Strain gauge
C LVDT
D Capacitive sensor

What is the primary use of a phase meter?

A To measure resistance
B To measure the phase difference between signals
C To measure power
D To measure temperature

Which characteristic of a measuring instrument ensures repeated measurements yield consistent results?

A Accuracy
B Precision
C Sensitivity
D Stability

What is the main purpose of a data acquisition system?

A To amplify signals
B To store signals
C To collect and process data
D To transmit data

Which type of noise affects electrical measurements most in industrial environments?

A Thermal noise
B Shot noise
C Electromagnetic interference (EMI)
D Quantum noise

What type of transducer is used to measure displacement?

A LVDT
B Thermistor
C Tachometer
D Wattmeter

What does the term “span” refer to in a measuring instrument?

A The minimum value it can measure
B The difference between the maximum and minimum values it can measure
C The accuracy of the instrument
D The rate of response

What type of transducer is used to measure pressure?

A Strain gauge
B Thermocouple
C Piezoelectric sensor
D LVDT

Which factor affects the accuracy of an energy meter?

A Resistance variation
B Magnetic field interference
C Capacitance of the load
D Phase angle between voltage and current

What is the main use of a Kelvin bridge?

A Measurement of high resistance
B Measurement of low resistance
C Measurement of capacitance
D Measurement of inductance

What property of a material is measured using strain gauges?

A Capacitance
B Resistance
C Deformation
D Inductance

Which type of error is reduced by proper shielding in electrical measurements?

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

What does an RLC meter measure?

A Resistance, inductance, and capacitance
B Voltage and current
C Power and energy
D Frequency and phase