A discrete-time signal x [n] is formed by sampling a continuous-time sinusoid 
at exactly its Nyquist rate with one of the samples occurring exactly at time, t = 0.
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What type of fan is used in most air cooled condensing units?
A) A blow through centrifugal fan B) A draw through propeller fan C) A draw through centrifugal fan D) No fan - most condensing units are natural draft
Technician A says that a drill is usually needed to remove a rivet. Technician B says that the most common rivet is a pop rivet. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
Technician A says brake pad thickness is the only check that needs to be performed. Technician B says pads can wear unevenly. Which technician is correct?
A) Technician A only B) Technician B only C) Both Technicians A and B D) Neither Technician A nor B
Why do some systems have discharge check valves?
What will be an ideal response?