What is phase shift keying? Describe how it works.
What will be an ideal response?
Phase shift keying (PSK) is a binary modulation technique, similar to phase modulation, in which the transmitter varies the starting point of the wave. The difference between PSK and phase modulation is that the PSK transmission starts and stops, because the signal being encoded onto it is binary.
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When conducted properly, which of the following will indicate faults such as cracks, discontinuity, thin spots, and faulty terminations?
a. Insulating test b. Hi-pot test c. Proof test d. DC test
Which type of fluid is highly friction modified?
A) ATF+4 B) Type A C) Type F D) Dexron
In a dual-fuel heat pump packaged system, when does the furnace go into use?
A) Only during winter conditions B) Once the outdoor temperature is below the balance point C) Once the outdoor temperature drops to the balance point D) Only when it is most economical
The electrical components for a fully welded hermetic compressor are checked at the disconnect box for the compressor unit.
Answer the following statement true (T) or false (F)