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

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

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Measurement and Instrumentation
It can be stated that

CT operates at almost the same flux density as a PT
No generalisation can be made with regard to the flux densities in CT and PT
CT operates with a higher flux density than PT
CT operates with considerably lower flux density than a PT

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