In acoustic emission testing, vibrations are detected by a transducer after a machine part has been subject to the
release of _____.
a. sparks
b. lubricant
c. sound
d. energy
d
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A(n) ____ drawing refers to three types of pictorial drawings: isometric, dimetric, and trimetric.
A. axonometric B. 2-D C. bird's eye D. top-down
Most multisplit units require connection to:
A) All of the circuits. B) At least two indoor units, but not all of the circuits have to be used. C) At least three indoor units, but not all of the circuits have to be used. D) At least four indoor units, but not all of the circuits have to be used.
A weak-sounding horn is being diagnosed. Technician A says that a poor ground connector at the horn itself could be the cause. Technician B says that an open relay can be the cause. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
In a direct digital control system the primary controller is the:
A) Voltage amplifier. B) Wheatstone bridge. C) Bleed-type thermostat. D) HVACR computer.