DomRAC
What component in a domestic refrigerator absorbs heat from the food compartment to cool the interior?
Evaporator
What component in commercial refrigeration systems collects excess liquid refrigerant to handle fluctuating cooling loads?
Liquid receiver
What component connects the vehicle's engine accessory belt to the AC compressor to engage or disengage it on demand?
Electromagnetic clutch
Which international treaty, signed in 1987, phased out ozone-depleting CFC refrigerants like R-12?
The Montreal Protocol
What has a neck but no head, and wears a cap but has no hair?
bottle
What safety device, attached directly to the compressor housing, trips to cut power if the compressor draws excessive current or overheats?
OLP
What valve uses a sensing bulb attached to the suction line to dynamically meter refrigerant into the evaporator?
Thermostatic Expansion Valve
What component in an automotive MAC system acts as both a storage tank and moisture filter on the high-pressure side?
Answer: Receiver-drier
What color is the standard service gauge and hose used for reading high-side pressure in an HVAC manifold set?
Red
What organ in the human body consumes roughly 20% of the body's total oxygen and energy despite making up only 2% of its weight?
brain
What type of expansion device, consisting of a very long, narrow copper tube, is standard in home refrigerators?
Capillary Tube
What device prevents liquid refrigerant from returning directly into the compressor suction port, protecting it against liquid slugging?
Accumulator (or suction line accumulator)
What heat exchanger component is located behind the vehicle dash and cools the cabin air blown by the blower motor?
Evaporator
What standard metric represents 12,000 British Thermal Units (BTU) per hour of cooling capacity?
1 Ton
What ancient civilization constructed the Great Pyramid of Giza, which stood as the tallest man-made structure in the world for over 3,800 years?
Egyptians
In a standard residential window-type air conditioner, what component drains the condensed water droplets out of the unit?
Drain pan (or condensate drain)
What inline accessory contains a desiccant material to capture water vapor and foreign debris in the liquid line?
Filter-drier
What protective switch cuts off power to the compressor clutch if system refrigerant pressure drops dangerously low or spikes too high?
Pressure switch
Which fundamental law of physics dictates that heat naturally flows only from a warmer body to a cooler body, requiring mechanical work (via a compressor) to move heat in reverse from a cool indoor space to the warmer outdoors?
2nd Law of Thermodynamics (or Second Law of Thermodynamics)
Which cold continent is technically classified as the world's largest desert because it receives so little rainfall or snow annually?
Antartica
What physical mechanism is used on refrigerator doors to ensure an airtight seal and prevent warm air leakage?
Magnetic door gasket
What glass window component allows technicians to visually inspect for bubbles in the liquid refrigerant line?
Sight glass (or moisture indicator)
What component on the low-pressure side of an orifice-tube MAC system separates liquid from vapor and stores excess refrigerant?
Accumulator
If refrigerants boil at around -26 degrees Celsius (-15 degrees Fahrenheit), what is the boiling point of water in Fahrenheit?
212 degrees Fahrenheit
What famous tower in France was originally intended as a temporary installation for the 1889 World's Fair and was almost torn down for scrap metal in 1909?
The Eiffel Tower