transformers

#1. Instrument transformers normally:

• AConvert 14 volts DC to 26 volts AC
• BReduce the A.C supply to 26 volts for some instruments.
• CChange 115 volts to 200 volts for engine instruments.
• DConvert 28 volts DC to 28 volts AC

#2. An auto-transformer:

• Avaries its turns ratio automatically to maintain a constant output voltage with varying input voltage.
• Bhas only one coil which is used as both primary and secondary
• Cwill maintain a constant output frequency with a varying supply frequency
• Drequires an inductive supply.

#3. A step-up transformer is one in which the number of turns on the secondary winding is:

• Athe same as the primary if the cable diameter is the same
• Bgreater than that on the primary.
• Cless than on the primary
• Dalways the same as on the primary