AEP Blueprint Reading & Interpretation 3

Question 1

On a transformer nameplate shown in a substation diagram, 'OA/FA' rating indicates:

Accepted Answer

Oil-immersed Air-cooled / Forced Air-cooled

Answer

OA/FA refers to Oil-immersed Air-cooled (self-cooled) / Forced Air-cooled cooling classes for power transformers per ANSI/IEEE standards.

Question 2

In electrical blueprint reading, 'conduit home runs' are indicated by:

Accepted Answer

A line running to the panel with an arrow and circuit number notation

Answer

Home runs are shown as lines with an arrowhead pointing toward the panel, accompanied by circuit number and panel designation.

Question 3

What does 'NTS' written on a blueprint dimension or view mean?

Accepted Answer

Not To Scale

Answer

NTS means 'Not To Scale,' indicating that the drawing's proportions do not accurately represent actual dimensions and written dimensions must be used.

Question 4

On a relay protection diagram for a transmission line, the designation '21' refers to which type of relay?

Accepted Answer

Distance (impedance) relay

Answer

Device number 21 per ANSI/IEEE C37.2 designates a distance or impedance relay, commonly used for transmission line protection.

Question 5

On a structural steel blueprint for a transmission tower, 'W8x31' refers to:

Accepted Answer

A wide-flange steel section 8 inches deep weighing 31 lbs/ft

Answer

W8x31 is the AISC designation for a wide-flange (W-shape) steel beam that is approximately 8 inches deep and weighs 31 pounds per linear foot.

(AEP) American Electric Power Practice Test

(AEP) American Electric Power Practice Test

AEP Blueprint Reading & Interpretation 3