Blueprint Reading & Interpretation Flashcards
7 cards from real BGE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Blueprint Reading & Interpretation flashcards as text
On a BGE electrical one-line diagram, what does a double horizontal line between two components typically represent?
Answer: A bus bar connecting multiple circuits
Double horizontal lines in a one-line diagram represent a bus bar, a common electrical conductor to which multiple circuits are connected.
A BGE gas main drawing shows 'PE 2" SDR 11' for a service line. What does SDR 11 specify?
Answer: The ratio of pipe outer diameter to wall thickness
SDR (Standard Dimension Ratio) is the ratio of outside diameter to wall thickness; SDR 11 indicates a specific wall thickness relative to pipe diameter, defining pressure capacity.
When interpreting a gas system schematic showing a 'PRV' symbol, what function does this device perform?
Answer: Reduces upstream pressure to a lower set downstream pressure
A PRV (Pressure Reducing Valve) automatically reduces higher inlet pressure to a lower, controlled outlet pressure for safe distribution.
A blueprint indicates a gas main with the notation 'XCOAT.' What does this describe?
Answer: The pipe is coated with an external corrosion-resistant material
XCOAT indicates the pipe has an external protective coating applied to resist corrosion, commonly used on steel mains in corrosive soil conditions.
What does the 'invert elevation' noted on a pipeline profile drawing refer to?
Answer: The elevation at the inside bottom of the pipe
Invert elevation is the elevation measured at the lowest interior point of a pipe, critical for calculating flow gradients and proper drainage.
On a BGE construction drawing, what is the purpose of a 'match line'?
Answer: It indicates where one drawing sheet continues on another sheet
A match line is used when a project is too large to fit on one sheet; it shows where to find the continuation of the drawing on an adjacent sheet.
A BGE gas map shows a valve marked 'NO.' In normal system operations, what does this mean?
Answer: The valve is Normally Open
On utility system maps, 'NO' designates a Normally Open valve, meaning it is open during standard operating conditions and would be closed only during emergencies or maintenance.