These are a helix or conical spiral form on the external surface of a shaft or internal surface of a cylindrical hole.

a. screw thread
b. tap
c. die
d. bolt and nut


a. screw thread

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Technician A says that you should begin HVAC problem diagnosis with a thorough inspection. Technician B says that you can determine from the inspection what type of system you are dealing with. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians D) Neither technician

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This is a conical-shaped tool used to cut the recess for the conically shaped head of a fastener.

a. counterdrill b. countersink c. spotface d. counterbore

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Fill in the blank(s) with the appropriate word(s).

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What is the RD pin on an ADC?

A) It is an active-HIGH output ENABLE. B) It is an active-LOW output ENABLE. C) It is an active-HIGH output DISABLE. D) It is an active-LOW output DISABLE.

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