transformers week 2

Front

when interpreting primary coil rating of a transformer, what number (whether printed first or last) is the number that needs to be impressed on the primary coil for proper operation? Options: the larger number of the voltages, the phase to phase voltage, the smaller number of the voltages, the phase to ground voltage

Back

the smaller number of the voltages

Front

if a transformer coil rating is printed after the system voltage, eg. (20800 GRDY./12000) the transformer will it have______________________ and it will be connected ____________.

Back

one bushing, phase to ground

Front

which is NOT a primary voltage designation for a transformer? Options: phase to phase connections only, phase to phase or phase to ground connections, phase to ground connections only, ground to ground connections only

Back

ground to ground connections only

Front

as listed in the text which is clearly the most versatile transformer?

Back

phase to phase or phase to ground connections

Front

T or F. when a transformer nameplate only lists one voltage on the high voltage section, the transformer must be wired in a delta configuration

Back

True

Front

engineers can choose from ___________different primary voltage designations when purchasing transformers

Back

3

Front

T or F. A tap changer is a no load switch connected to the secondary coil

Back

false

Front

the dual voltage switch of a transformer can be operated while energized

Back

False

Front

If high cost voltage regulation is not practical, which is an option most likely to be considered by a company? Options: capacitors, dual rated transformers, tap changing transformers, reactor

Back

tap changing transformers

Front

by what amount does the tap changer raise or lower the secondary voltage? Options: 2.5% or 4.2%, 2.5% or 4.5%, 4.5% or 5.5%, 5/8% each step

Back

2.5% or 4.5%