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

 250 Hz.
 500 Hz.
 625 Hz.
 400 Hz.

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

  It is based on null balance technique.
 It is possible to standardize before a measurement is undertaken.
 None of above.
 The precision in measurment is independent of the type of the defector used.

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Measurement and Instrumentation
The measurement of a quantity

  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with known quantity.
 is a comparison of an unknown quantity with another quantity.
 none of these.

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