#1
Which instrument is used to measure DC voltage?
Voltmeter
ExplanationDevice for measuring electrical potential difference
#2
What is the SI unit of electrical resistance?
Ohm
ExplanationUnit of resistance in electrical circuits
#3
What is the function of a transducer?
To convert mechanical energy into electrical energy
ExplanationDevice converting one form of energy into another
#4
What is the function of a galvanometer?
To detect and measure small electric currents
ExplanationInstrument for measuring small electric currents
#5
Which material is commonly used as a core in transformers?
Iron
ExplanationCommon material for magnetic cores in transformers
#6
What is the SI unit of electrical conductance?
Siemens
ExplanationUnit of electrical conductance
#7
Which of the following is a type of electrical measurement instrument used to measure current?
Ammeter
ExplanationInstrument for measuring electric current
#8
What is the SI unit of electric charge?
Coulomb
ExplanationUnit of electric charge
#9
Which of the following is used to measure the insulation resistance of electrical equipment?
Ohmmeter
ExplanationInstrument for measuring electrical resistance
#10
Which of the following is a passive transducer?
Strain gauge
ExplanationDevice that measures strain on an object
#11
What is the primary function of an oscilloscope?
Display voltage vs. time graph
ExplanationDevice to visualize electrical signals over time
#12
What is the principle behind the operation of a thermocouple?
Seebeck effect
ExplanationGeneration of voltage due to temperature difference
#13
Which of the following instruments is used to measure high-frequency AC signals?
Digital oscilloscope
ExplanationOscilloscope with digital display for high-frequency signals
#14
Which of the following is used to measure the power factor of a circuit?
Power factor meter
ExplanationInstrument for determining efficiency of electrical system
#15
What does an LCR meter measure?
Inductance, capacitance, and resistance
ExplanationInstrument for measuring inductance, capacitance, and resistance
#16
Which of the following is NOT a type of electrical transducer?
Wattmeter
ExplanationInstrument for measuring power consumption
#17
What is the primary function of a multimeter?
All of the above
ExplanationInstrument capable of measuring multiple electrical properties
#18
What does a tachometer measure?
Speed
ExplanationDevice measuring rotational or linear speed
#19
What is the principle behind the operation of a Hall effect sensor?
Hall effect
ExplanationGeneration of voltage perpendicular to current in conductor
#20
What does a hygrometer measure?
Humidity
ExplanationDevice measuring humidity in air
#21
What is the purpose of a shunt resistor in an ammeter?
To decrease sensitivity
ExplanationTo divert most of the current, reducing sensitivity
#22
In a Wheatstone bridge, what happens when the ratio of the resistances in the two arms are equal?
The bridge becomes balanced
ExplanationEqual voltage on opposite sides, indicating balance
#23
What is the function of a strain gauge?
To measure pressure
ExplanationDevice measuring pressure by detecting strain
#24
What is the function of a photovoltaic cell?
To convert light energy into electrical energy
ExplanationDevice converting light energy into electrical energy
#25
What is the purpose of a piezoelectric sensor?
To measure pressure
ExplanationDevice converting mechanical pressure into electrical charge