Transformers week 2

What is the purpose of a transformer's nameplate?

• To describe its technical aspects

• To provide a decorative element

• To increase its weight

• To change its color

Before installation, what should lineworkers ensure by referring to the nameplate?

• Desired primary voltage is chosen

• Desired secondary voltage is chosen

• Impedances are within +/- 7.5% if banking or paralleling

• All of the above

Fill in the blank: The nameplate provides information that the utility can track for the ______ of the transformer.

• life

• color

• weight

• size

What is one of the purposes of determining the weight of the transformer?

• For rigging purposes

• To increase efficiency

• To reduce cost

• To enhance appearance

Where can the nameplate usually be found on overhead transformers?

• On or near the lower mounting bracket.

• On the top of the transformer.

• Inside the transformer casing.

• Near the cooling fins.

Which of the following is true about transformer nameplates?

• They are identical for all transformers.

• They have subtle differences based on the type of transformer.

• They are only found on underground transformers.

• They do not include voltage ratings.

What is the purpose of the serial number on a transformer?

• used to know what transformers can be banked together.

• The serial number is used to measure the voltage of the transformer.

• The serial number indicates the power rating of the transformer.

• The serial number is used for inventory and tracking purposes.

How does polarity affect the direction of current flow in transformers?

• Additive transformers will have the x1 on the right (facing the transformer) and subtractive transformers will have the x1 on the left.

• additive transformers have the x1 on the left (facing the transformer) and subtractive transformers will have the x1 on the right.

• Polarity only affects the efficiency of transformers, not the direction of current flow.

• Polarity affects only the voltage levels, not the direction of current flow.

What is impedance in the context of transformers?

• Impedance is the total opposition to current flow caused by resistance and inductive reactance.

• Impedance is the measure of electrical power in a circuit.

• Impedance is the ability of a transformer to increase voltage.

• Impedance is the resistance to magnetic flux in a transformer.

What does the schematic on a transformer nameplate show?

• The schematic shows the primary and secondary coils and their relationship.

• The schematic shows the voltage rating of the transformer.

• The schematic shows the physical dimensions of the transformer.

• The schematic shows the cooling method used in the transformer.