#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
Which of the following is a passive transducer?
Strain gauge
ExplanationDevice that measures strain on an object
#7
What is the primary function of an oscilloscope?
Display voltage vs. time graph
ExplanationDevice to visualize electrical signals over time
#8
What is the principle behind the operation of a thermocouple?
Seebeck effect
ExplanationGeneration of voltage due to temperature difference
#9
Which of the following instruments is used to measure high-frequency AC signals?
Digital oscilloscope
ExplanationOscilloscope with digital display for high-frequency signals
#10
Which of the following is used to measure the power factor of a circuit?
Power factor meter
ExplanationInstrument for determining efficiency of electrical system
#11
What is the purpose of a shunt resistor in an ammeter?
To decrease sensitivity
ExplanationTo divert most of the current, reducing sensitivity
#12
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
#13
What is the function of a strain gauge?
To measure pressure
ExplanationDevice measuring pressure by detecting strain
#14
What is the function of a photovoltaic cell?
To convert light energy into electrical energy
ExplanationDevice converting light energy into electrical energy
#15
What is the purpose of a piezoelectric sensor?
To measure pressure
ExplanationDevice converting mechanical pressure into electrical charge