Electrical and electronics measurements miscellaneous

Electrical and electronics measurements miscellaneous

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Electrical and Electronics Measurements

Electrical and electronics measurements miscellaneous
  1. A sinusoidal waveform, when observed on an oscilloscope, has a peak to peak amplitude of 6 cm. If the vertical sensitivity setting is 5V/ cm, then rms value of the voltage will be ____________V








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    Amplitude of the signal

    =
    6 × 5
    		 = 15 V
    2

    ∴ rms value =
    15
    		 = 10.6 V
    √2

    Correct Option: C

    Amplitude of the signal

    =
    6 × 5
    		 = 15 V
    2

    ∴ rms value =
    15
    		 = 10.6 V
    √2

  1. A CRO screen has ten divisions on the horizontal scale. If a voltage signal 5 sin (314 t + 45°) is examined with a line base setting of 5 m sec/div, the number of cycles of signal displayed on the screen will be ___________cycles








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    The lines base setting = 5 msec/div

    Input frequency =
    50 × 10
    		 = 2.5
    200

    Now, Frequency of input signal = 314 = ω.
    or 2 πƒ = 314 or ƒ = 314/2π = 50 Hz
    Number of cycles of signal displayed
    =
    50 × 10
    		 = 2.5
    200

    Correct Option: A

    The lines base setting = 5 msec/div

    Input frequency =
    50 × 10
    		 = 2.5
    200

    Now, Frequency of input signal = 314 = ω.
    or 2 πƒ = 314 or ƒ = 314/2π = 50 Hz
    Number of cycles of signal displayed
    =
    50 × 10
    		 = 2.5
    200

  1. A Lissajous pattern on an oscilloscope has 5 horizontal tangencies and 2 vertical tangencies. The frequency of the horizontal input is 100 Hz. The frequency of the vertical input will be _________Hz








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    ƒv
    		 =
    Th
    		 ƒv =
    5
    		 × 1000 = 2500 Hz
    ƒhTv2

    Correct Option: D

    ƒv
    		 =
    Th
    		 ƒv =
    5
    		 × 1000 = 2500 Hz
    ƒhTv2

  1. In a source follower type electronic voltmeter, the transconduct ance of FETs is 0.005 mho and resistance of the meter is 100 Ω. The approximated value of current through the meter, when the input voltages is 1 V, is ________mA








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    NA

    Correct Option: A

    NA

  1. A 53 Hz reed type frequency meter is polarized wit h d.c. The new range frequency meter is ________Hz








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    NA

    Correct Option: C

    NA