Explain the difference between a working drawing and a picture drawing of an object.
What will be an ideal response?
A working drawing is composed of both detailed drawings and assembly drawings that are used to completely understand the geometry of a product, its parts, and how it is assembled. Detail drawings contain multiple perspectives of a single part along with its dimensions, material composition, surface treatment, surface finish, tolerances, and part number. Assembly drawings call out the various parts used in the assembly, a unique identifying part number, quantities, and their location in the assembly.
A picture drawing is a representation of an object as seen by an observer from a specific point of view. They provide a 3-D perspective of the object and do not contain dimensions or additional details that are required to make it.
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The standard scale of piping drawings is _____ inch = 1 foot.
a. 1/4 b. 3/8 c. 5/8 d. 3/4
When checking ring and pinion runout, read the backlash at several points around the gear. The maximum variance should be no more than ____.
A. 0.002" to 0.003" B. 0.01" to 0.02" C. 0.05" to 0.06" D. 0.06" to 0.08"
The advantage of using a thermistor-type thermometer over a mercury-filled thermometer for measuring refrigerant line temperature is that the thermistor-type does not have to be insulated.
Answer the following statement true (T) or false (F)
Variable refrigerant flow systems operate more efficiently with ________ installed outdoor unit capacity by shifting the heating and cooling to where it is needed
A) smaller B) full C) larger