Before opening any part of the air conditioning system refrigerant must:
A. Be evacuated
B. Be allowed to cool down to relieve system pressure
C. Be vented to the atmosphere
D. Recovered
Answer: D
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What happens when room temperature soda is poured into a glass of ice?
A. The ice gets colder. B. The ice melts because it is giving up the "cold" to the soda. C. The ice melts because it is absorbing heat from the soda. D. The ice melts because the soda is colder than the ice.
A refrigeration cycle in which the high side is above the critical point and the low side is below the critical point is called a:
A) Sub-critical system. B) Trans-critical system. C) Super-critical system. D) Non-critical system.
The type and thickness of gypsum wallboard used in partitions is determined by _____
a. fire rating and soundproofing requirements b. labor contract provisions c. project cost considerations d. product availability
Technician A says the fluid that most cars use is a mixture of water and ethanol glycol (C2H6O2). Technician B says that the radiator is in fact a heat exchanger. Who is correct?
A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B