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Refrigeration and Air Conditioning Systems Mechanic (313A) and Residential Air Conditioning Systems Mechanic (313D) Quiz

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One 100-Watt and one 30-Watt incandescent light bulbs, both rated to be used in 120 VAC circuits, are wired in series and supplied with 120 volts AC. Which bulb lights brighter?
The 100-Watt bulb
The 30-Watt bulb
Both bulbs light brightly
Neither bulb light in a series circuit
A Class C fire extinguisher:
Is to be used on fires involving combustible materials such as paper, wood, cardboard, and most plastics.
Is to be used on fires involving electrical equipment, such as appliances, wiring, circuit breakers and outlets.
Is to be used on fires involving flammable or combustible liquids such as gasoline, kerosene, grease and oil
Is to be used on fires involving chemicals such as combustible metals, such as magnesium, titanium, potassium and sodium.
Dividing the density of a refrigeration oil by the density of water under atmospheric pressure gives the ___________ of that refrigerant oil.
Specific Gravity
Specific Weight
Density
Specific Volume
It takes __________ BTUs to melt 1 ton of ice in a 24-hour period
288,000
12,000
200
1 metric ton of
Which of the following metering devices is best capable of maintaining an evaporator pressure that corresponds to the lowest evaporator temperature desired through the entire running cycle of the compressor?
Thermostatic Expansion Valve (TEV)
Automatic Expansion Valve (AEV)
Capillary Tube
Fixed Orifice
When the vapour refrigerant is superheated in a vapour-compression refrigeration cycle:
It stops absorbing heat
It must be pumped back into the Evaporator
It’s chemical composition changes
It does not follow to a pressure-temperature chart
In a vapour-compression refrigeration cycle, the evaporating pressure is 69 PSIG, the refrigerant is R-22, and the evaporator outlet temperature is 55°F. What is the evaporator superheat?
10°F
14°F
19°F
25°F
Net Refrigeration Effect is:
The quantity of heat that each pound of refrigerant absorbs from the refrigerated space to produce useful cooling
The enthalpy of vapour leaving evaporator added to the enthalpy of vapour entering Evaporator
The enthalpy of vapour leaving Evaporator
The enthalpy of vapour entering Evaporator
A condenser fan-pressure control or a fan-cycle control in commercial and industrial refrigeration systems are used to:
Separate refrigerant vapour from liquid
Ensure the compressor is not overheated
Shut down the fans during the defrost cycles
Reduce the effect of changing outdoor temperature throughout the year
When is the crankcase heater is used and why?
During low ambient temperatures, to keep the oil at a proper temperature
. During off-cycle, to prevent refrigerant migrating and mixing with oil
During defrost cycles, to defrost the crankcase
When the compressor is running, to prevent refrigerant migration
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