HVACR technicians use tools that compare pressure to atmospheric pressure. What is this type of pressure called?
A) Column pressure B) Absolute pressure
C) Barometric pressure D) Gauge pressure
D
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a. architectural drawings b. historical records c. previous contractual data of subcontractors d. specific cost of equipment records
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Indicate whether the statement is true or false
Technician Asays air fills the rear chamber when brake application opens the air valve and closes the vacuum valve, and the front chamber is kept in vacuum. Technician B says when the brakes are held at midpoint, both valves are closed to trap vacuum and atmospheric pressure and keep the diaphragm in a balanced position. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
If the output of an astable 555 timer is LOW for 2.85 ?s and HIGH for 6.7 ?s, the duty cycle is
A) 57% B) 52% C) 70% D) 90%