The table lists two instrument transformers and their features:

The correct matching of the two columns is

A 200/1 current transformer (CT) is wound with 200 turns on the secondary on a toroidal core.  When it carries a current of 160 A on the primary, the ratio and phase errors of the CT are found to be -0.5% and 30 minutes respectively.  If the number of secondary turns is reduced by 1 the new ratio error (%) and phase error (min) will be respectively

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

A 50 Hz, bar primary CT has a secondary with 500 turns. The secondary supplies 5A current into a purely resistive burden of 1W. The magnetizing ampere-turns is 200. The core flux in the CT, under the given operating condition is

A 500 A/5 A, 50 Hz current transformer has a bar primary. The secondary burden is a pure resistance of 1 Ω and it draws a current of 5 A. If the magnetic core requires 250 AT for magnetization, the percentage ratio error is

Instrument transformers are known to introduce magnitude and phase errors in measurements. These are primarily due to

The primary current in a current transformer is dictated by

The ratio and phase angle errors in a well designed current transformer (CT) are kept within specified limits by using

Precautions are essential for ensuring that the secondary of a CT is not open circuited when the primary circuit carries a current because