Which type of thread standard uses more threads per inch?
A) National fine (NF) B) AHRI standard threads
C) Pipe threads D) National coarse (NC)
A
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Which of the following statements is true?
a. If an HVAC contractor detects an IAQ problem during routine maintenance, the contractor should immediately inform the customer about the problem in writing. b. HVAC contractors have no liability for system repairs that do not meet local code requirements if the code was changed before the repairs were completed. c. Occupants of a building who claim to suffer from sick-building syndrome may sue the owner of the building, but not the HVAC contractor, for damages. d. The International Building Code requires that HVAC contractors assume unlimited liability when retrofitting existing systems.
When grinding hardened steel, two kinds of surface failures are:
A) Decarburization and pitting B) Changes in hardness on the surface and internal stresses C) Porosity and discoloration from the quench medium D) None of the above
The outside boundary for work on a site is called.
What will be an ideal response?
A circuit that converts an digital signal to an analog waveform is commonly called a(n) ________
A) CAD B) DAC C) ADC D) PLD