Electrical Measurements and Instrumentation MCQs (Part-15)

Which instrument measures electrical current directly?

A Voltmeter
B Ammeter
C Wattmeter
D Galvanometer

What type of transformer is used to measure high currents in power systems?

A Auto transformer
B Current transformer
C Distribution transformer
D Potential transformer

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

A Oscilloscope
B Phase meter
C Wattmeter
D Multimeter

What does a tachometer measure?

A Voltage
B Speed of rotation
C Resistance
D Inductance

What is the principle of operation of a piezoelectric transducer?

A Resistance change with temperature
B Electrical voltage generated under mechanical stress
C Magnetic induction
D Capacitance variation

What is the purpose of a galvanometer?

A Measure current
B Measure small currents
C Measure voltage
D Measure power

Which bridge is used to measure inductance?

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

What does a frequency meter measure?

A Voltage
B Frequency of AC signals
C Current
D Energy consumption

Which transducer is used for temperature measurement?

A Strain gauge
B Thermocouple
C LVDT
D Pressure sensor

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

A Electromagnetic induction
B Electromagnetic induction to step down current
C Capacitive effect
D Piezoelectric effect

Which material is most commonly used in a galvanometer coil?

A Copper
B Aluminum
C Iron
D Steel

What does an oscillograph measure?

A Frequency
B Time-dependent electrical signals
C Power consumption
D Current levels

What does a pressure transducer measure?

A Flow rate
B Pressure
C Displacement
D Speed

Which device is used to measure the temperature of an object?

A Thermometer
B Thermocouple
C Strain gauge
D Pressure gauge

What is the purpose of a signal conditioner?

A To measure displacement
B To amplify and filter raw signals
C To store signals
D To transmit signals wirelessly

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

A To measure average power in AC and DC circuits
B To measure instantaneous voltage
C To measure current
D To measure resistance

What is the function of a potentiometer in electrical measurements?

A To compare unknown voltage with a reference
B To measure current
C To measure temperature
D To measure resistance

What is the primary use of a Kelvin bridge?

A To measure low resistance accurately
B To measure capacitance
C To measure voltage
D To measure frequency

What is the primary purpose of a current transformer (CT)?

A To step down current for measurement
B To step up voltage
C To step down voltage for measurement
D To measure resistance

Which instrument is used to measure small voltages accurately?

A Galvanometer
B Voltmeter
C Ammeter
D Wattmeter