The standard AHRI design condition used for rating unitary air-conditioning equipment is:
A) 80F outdoor ambient temperature, 95F dry-bulb, 67F wet-bulb indoor temperature.
B) 95F outdoor ambient temperature, 80F dry-bulb, 67F wet-bulb indoor temperature.
C) 90F outdoor ambient temperature, 75F dry-bulb, 67F wet-bulb indoor temperature.
D) 80F outdoor ambient temperature, 80F dry-bulb, 67F wet-bulb indoor temperature.
[Ques. 2] The most reliable source of information on how to charge any particular piece of equipment is:
A) The equipment manufacturer. B) ASHRAE.
C) AHRI. D) The local inspection authorities.
[Ques. 3] What type of meter do HVACR technicians use to measure current?
A) An in-line wattmeter B) A clamp-on ammeter
C) A solenoid meter D) A noncontact voltage detector
[Ques. 4] Overcharging a system reduces its efficiency by:
A) Increasing the operating head pressure and compression ratio.
B) Starving the evaporator.
C) Decreasing the system subcooling.
D) Increasing the system superheat.
[Ques. 5] When testing a normally open relay contact with a de-energized coil it should measure:
A) 0.
B) Some measurable resistance depending on the design of the relay.
C) Infinite or OL on digital meters.
D) None of the above.
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