What is the transformer ratio of T4-T9 in a MEP 12?

The transformer ratio of T4-T9 in a MEP 12 is indeed 20:1, which indicates that the transformer steps down the voltage by a factor of 20. This means that for every 20 volts of input voltage, the output voltage will be 1 volt.

Understanding the transformer ratios is important as it directly relates to how electrical equipment is supplied with voltage and how effectively they can operate within specified parameters. For the MEP 12, a 20:1 ratio suggests a significant reduction in voltage which is necessary for the proper functioning of connected devices. The units and systems involved are designed around this ratio to ensure optimal performance and safety, as using an incorrect transformer ratio could lead to either insufficient power supply or damage to electrical components.

The other choices represent transformer ratios that do not align with the MEP 12 specifications, indicating either too much voltage reduction or not enough, which would not be compatible with the operational requirements of the equipment in question.