Measuring Instruments and Bridge Circuits Quiz
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Questions and Answers

What is the main role of meters and measuring instruments in electronics?

  • Assessing how an electronic circuit is performing (correct)
  • Storing data about electronic circuits
  • Determining the color of electronic circuits
  • Measuring the weight of electronic circuits

    • Which of the following are fundamental electrical measurements?

  • Energy, force, and velocity
  • Temperature, pressure, and speed
  • Voltage, current, and impedance (correct)
  • Resistance, power, and frequency

    • What is the function of a wattmeter?

  • Monitoring power consumption and managing energy savings (correct)
  • Counting the number of components in electronic circuits
  • Measuring temperature in electronic circuits
  • Testing the speed of electronic components

    • What type of wattmeters come in analog and digital variants?

    <p>Wattmeters</p> Signup and view all the answers

    Which instrument is used to measure field strength, stroboscope, and pH?

    <p>Q meter</p> Signup and view all the answers

    What does a megger meter measure?

    <p>Resistance of electrical insulation</p> Signup and view all the answers

    What is the main difference between analog and digital meters?

    <p>Analog meters use a moving pointer on a calibrated scale, while digital meters provide precise power measurements electronically.</p> Signup and view all the answers

    What are the two types of wattmeters mentioned in the text?

    <p>Electrodynamometer wattmeter and Induction wattmeter</p> Signup and view all the answers

    In an electrodynamometer wattmeter, what carries the load current?

    <p>Fixed coil</p> Signup and view all the answers

    What is the role of the shunt magnet in the induction type wattmeter?

    <p>It carries a current proportional to the supply voltage.</p> Signup and view all the answers

    What causes the mechanical force to act between the coils in an electrodynamometer wattmeter?

    <p>The reversal of the circuit current reverses the currents in both the current coil and potential coil.</p> Signup and view all the answers

    What does the coil of series magnet in induction type wattmeter carry?

    <p>Load current</p> Signup and view all the answers

    How is the working of induction type wattmeter based?

    <p>On the principle of electromagnetic induction</p> Signup and view all the answers

    What is placed between the two magnets in an induction type wattmeter?

    <p>A thin disc made up of aluminium</p> Signup and view all the answers

    What causes a mechanical force to deflect the moving coil and pointer over the scale in electrodynamometer wattmeters?

    <p>Due to the currents in the coils, a mechanical force acts between them.</p> Signup and view all the answers

    Why can electrodynamometer wattmeters measure power in both AC as well as DC circuits?

    <p>As the reversal of the circuit current reverses the currents in both the current coil and potential coil so that the direction of deflecting torque remains unchanged.</p> Signup and view all the answers

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