WorksheetsChapter 5
Total questions: 6
Worksheet time: 4mins
Instrument transformers are employed in conjunction with standard low-range A.C instruments.
True
False
The purpose of a CT is to ________ the line current to be easily measured with meters of moderate size.
increase
reduce
maintain
The characteristic of using instrument transformers include:
It enables the single range instrument to cover a large current or voltage range.
It is not possible to locate the measuring instruments far away from the high voltage circuit.
Metering circuit is isolated from high voltage power circuit.
The primary of CT consists of _________ number of turns of thick cross-section connected in series with the high current line, whilst the secondary winding consists of ________ number of turns of fine wire.
large, few
several, one
few, large
Transformation ratio is
ratio of the turns of the transformer windings.
ratio of primary winding current to the secondary winding current of the transformer.
ratio of the rated primary winding current to the rated secondary winding current of the transformer.
A current transformer has 1 turn on its primary and 200 turns on its secondary. It is to be used with a standard range of ammeters that have an internal resistance of 0.5 Ohm. When the primary current is 600 A, the ammeter shows a full-scale deflection. What will be the voltage across the ammeter?
2 V
2.5 V
1.5 V
3 V
