Measurement and Instrumentation
A 50 Hz bar primary CT has a secondary with 500 turns. The secondary supplies 5 A current into a purely resistive burden of 1Ω. The magnetizing ampere-turn is 200. The phase angle between the primary and secondary current is

  4.6o.
 94.6o.
 85.4o.
 175.4o.

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Measurement and Instrumentation
The measurment of very low and very high frequencies is invariably done using a frequency counter in which one of the following?

  Period and frequency measurement modes respectively.
 Frequency and period measurment modes, respectively.
 Period measurment modes only.
 Frequency measurment modes only.

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