Ramsay Test Print Reading and Schematics 5

Question 1

On a thread callout '1/4-20 UNC', what does the number 20 represent?

Accepted Answer

Threads per inch

Answer

In a unified thread callout the second number is the threads per inch.

Question 2

In a relay logic schematic, a coil symbol energizing causes its associated contacts to do what?

Accepted Answer

Change state (open contacts close, closed contacts open)

Answer

When a relay coil is energized, its normally open contacts close and normally closed contacts open.

Question 3

A break line (a long thin line with a jog or zigzag) on a drawing is used to do what?

Accepted Answer

Show that a long uniform part has been shortened to fit the sheet

Answer

Break lines let a long object be drawn shorter while keeping its true dimension.

Question 4

In a P&ID, a dashed line connecting an instrument to a process line usually represents what kind of signal?

Accepted Answer

An electrical signal

Answer

A dashed line is the standard symbol for an electrical instrument signal.

Question 5

An extension line on a dimensioned drawing serves what purpose?

Accepted Answer

Extends from the part to show where a dimension begins and ends

Answer

Extension lines project from feature edges so dimension lines can be placed away from the view.

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