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ECE :: Measurements and Instrumentation

  1. The form factor in AC is the ratio of

  2. A.

     Peak value to average value

    B.

     Peak value to rms value

    C.

     Rms value to average value

    D.

     Rms value to peak value


  3. The error of an instrument is normally given as a percentage of

  4. A.

     Measured value

    B.

     Full-scale value

    C.

     Mean value

    D.

     Rms value


  5. The repeat accuracy of an instrument can be judged from its

  6. A.

     Static error

    B.

     Linearity error

    C.

     Dynamic error

    D.

     Standard deviation of error


  7. The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is

  8. A.

     Standard ohm

    B.

     One international ohm

    C.

     One ohm according to SI units

    D.

     One ohm according to working standards


  9. In a gravity controlled instrument, the deflection angle is proportional

  10. A.

     Measurand

    B.

     Square of the measurand

    C.

     Sine inverse of measurand

    D.

     Sine of the measurand


  11. The problem of Electrostatic coupling in a transformer is acute at

  12. A.

     Low frequencies

    B.

     Power frequencies

    C.

     High frequencies

    D.

     High load on the transformer


  13. Which meter is suitable for the measurement of 10mV at 50MHz?

  14. A.

     Moving iron voltmeter

    B.

     VTVM

    C.

     Moving coil voltmeter

    D.

     CRO


  15. Which of the following devices should be used for accurate measurement of low D.C. voltage?

  16. A.

     Small range moving coil voltmeter

    B.

     D.C. potentiometer

    C.

     Small range thermocouple voltmeter

    D.

     None of the above


  17. An instrument to be used for measurement and control should preferably have

  18. A.

     Dead zone and dead time

    B.

     Linear output and fast response

    C.

     Non-linear output

    D.

     A highly damped response


  19. Electrostatic instruments are normally used for

  20. A.

     Low current measurements

    B.

     High current measurements

    C.

     Low voltage measurements

    D.

     High voltage measurements