Measurement and Instrumentation
To the y input of a CRO a signal defined by 10sin100t is applied. To the x input the signal 10cos100t is fed. The gain for both x-channel and y-channel is the same. The screen shows

 a straight line.
 an ellipse.
  a circle.
 sinisoidal.

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Measurement and Instrumentation
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

  It does not load the circuit at all.
 It uses centre zero galvanometer instead of voltmeter.
 It loads the circuit to maximum extent.
 It loads the circuit moderately.

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