Gibilisco:Chapter 3 - Measuring Devices

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Gibilisco:Chapter 3 - Measuring Devices

This is the MCQs for Gibilisco:CHAPTER 3 - MEASURING DEVICES


Questions and Answers
  • 1. 
    The force between two electrically charged objects is called: 
    • A. 

      Electromagnetic deflection

    • B. 

      Electrostatic force

    • C. 

      Magnetic force

    • D. 

      Electroscopic force

  • 2. 
    The change in the direction of a compass needle, when a current-carrying wire is brought near, is: 
    • A. 

      Electromagnetic deflection

    • B. 

      Electrostatic force

    • C. 

      Magnetic force

    • D. 

      Electroscopic force

  • 3. 
    Suppose a certain current in a galvanometer causes the needle to deflect 20 degrees, and then this current is doubled. The needle deflection: 
    • A. 

      Will decrease

    • B. 

      Will stay the same

    • C. 

      Will increase

    • D. 

      Will reverse direction

  • 4. 
    One important advantage of an electrostatic meter is that: 
    • A. 

      It measures very small currents

    • B. 

      It will handle large currents

    • C. 

      It can detect ac voltages

    • D. 

      It draws a large current from the source

  • 5. 
    A thermocouple: 
    • A. 

      Gets warm when current flows through it

    • B. 

      Is a thin, straight, special wire

    • C. 

      Generates dc when exposed to light

    • D. 

      Generates ac when heated

  • 6. 
    One advantage of an electromagnet meter over a permanent-magnet meter is that: 
    • A. 

      The electromagnet meter costs much less

    • B. 

      The electromagnet meter need not be aligned with the earth’s magnetic field

    • C. 

      The permanent-magnet meter has a more sluggish coil

    • D. 

      The electromagnet meter is more rugged

  • 7. 
    An ammeter shunt is useful because: 
    • A. 

      It increases meter sensitivity

    • B. 

      It makes a meter more physically rugged

    • C. 

      It allows for measurement of a wide range of currents

    • D. 

      It prevents overheating of the meter

  • 8. 
    Voltmeters should generally have: 
    • A. 

      Large internal resistance

    • B. 

      Low internal resistance

    • C. 

      Maximum possible sensitivity

    • D. 

      Ability to withstand large currents

  • 9. 
    To measure power-supply voltage being used by a circuit, a voltmeter
    • A. 

      Is placed in series with the circuit that works from the supply

    • B. 

      Is placed between the negative pole of the supply and the circuit working from the supply

    • C. 

      Is placed between the positive pole of the supply and the circuit working from the supply

    • D. 

      Is placed in parallel with the circuit that works from the supply

  • 10. 
    Which of the following will not cause a major error in an ohmmeter reading? 
    • A. 

      A small voltage between points under test

    • B. 

      A slight change in switchable internal resistance

    • C. 

      A small change in the resistance to be measured

    • D. 

      A slight error in range switch selection

  • 11. 
    The ohmmeter in Fig. 3-17 shows a reading of about:   
    • A. 

      33,000 Ω

    • B. 

      3.3 KΩ

    • C. 

      330 Ω

    • D. 

      33 Ω

  • 12. 
    The main advantage of a FETVM over a conventional voltmeter is the fact that the FETVM: 
    • A. 

      Can measure lower voltages

    • B. 

      Draws less current from the circuit under test

    • C. 

      Can withstand higher voltages safely

    • D. 

      Is sensitive to ac as well as to dc

  • 13. 
    Which of the following is not a function of a fuse? 
    • A. 

      To be sure there is enough current available for an appliance to work right

    • B. 

      To make it impossible to use appliances that are too large for a given circuit

    • C. 

      To limit the amount of power that a circuit can deliver

    • D. 

      To make sure the current is within safe limits

  • 14. 
    A utility meter’s motor speed works directly from: 
    • A. 

      The number of ampere hours being used at the time

    • B. 

      The number of watt hours being used at the time

    • C. 

      The number of watts being used at the time

    • D. 

      The number of kilowatt hours being used at the time

  • 15. 
    A utility meter’s readout indicates: 
    • A. 

      Voltage

    • B. 

      Power

    • C. 

      Current

    • D. 

      Energy

  • 16. 
    A typical frequency counter: 
    • A. 

      Has an analog readout

    • B. 

      Is usually accurate to six digits or more

    • C. 

      Works by indirectly measuring current

    • D. 

      Works by indirectly measuring voltage

  • 17. 
    A VU meter is never used for measurement of: 
    • A. 

      Sound

    • B. 

      Decibels

    • C. 

      Power

    • D. 

      Energy

  • 18. 
    The meter movement in an illumination meter measures: 
    • A. 

      Current

    • B. 

      Voltage

    • C. 

      Power

    • D. 

      Energy

  • 19. 
    An oscilloscope cannot be used to indicate: 
    • A. 

      Frequency

    • B. 

      Wave shape

    • C. 

      Energy

    • D. 

      Peak signal voltage

  • 20. 
    The display in Fig. 3-18 could be caused by a voltage of: 
    • A. 

      6.0 V

    • B. 

      6.6 V

    • C. 

      7. 0V

    • D. 

      No way to tell; the meter is malfunctioning

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