Blueprint Reading & Interpretation Flashcards

On an appliance wiring diagram, a dashed line typically represents which type of connection?

Answer: A field-installed or optional wire

Dashed lines on wiring diagrams indicate field-installed or optional wiring that is not part of the factory assembly.

What does the symbol 'M' inside a circle typically represent on an appliance schematic?

Answer: Motor

A circle containing the letter 'M' is the standard schematic symbol for an electric motor.

When reading a refrigerator blueprint, the evaporator and condenser coils are distinguished primarily by their location relative to which component?

Answer: The compressor

The evaporator coil is located on the low-pressure side before the compressor, while the condenser coil is on the high-pressure side after it.

A CAR technician sees '120V/60Hz' noted near a component on a blueprint. What does '60Hz' specify?

Answer: The AC frequency of the power supply

60Hz denotes the frequency of the alternating current supply, which is the US standard.

On a parts breakdown diagram for a washing machine, exploded-view drawings are used primarily to:

Answer: Illustrate the assembly sequence and part relationships

Exploded-view drawings separate components spatially to clearly show how parts fit together and the order of assembly.

Which line type on a piping-and-instrumentation diagram (P&ID) for a refrigeration system indicates insulated piping?

Answer: A double parallel line

Insulated piping is conventionally shown as two parallel lines representing the pipe wall and the insulation layer.

A blueprint legend shows a triangle symbol pointing downward near a drain line. This most likely indicates:

Answer: A floor drain or condensate drain outlet

A downward-pointing triangle near a drain line in appliance blueprints conventionally marks a condensate or floor drain outlet.