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

 625 Hz.
 500 Hz.
 400 Hz.
 250 Hz.

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Measurement and Instrumentation
Which of following is not correct?

  An electronic voltmeter draw appreciable current from the source.
 Voltmeter should have very high resistance.
 A shunt should have a very low resistance.
 An ammeter should have a very low resitance.

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