2024-2025 Edition. All Questions with
Correct Answers. Graded A+
_______________ are copper tubing that carry refrigerant in both gas and
liquid states through a cooling system.
A. Compressor lines
B. Condenser lines
C. Refrigerant lines
D. Freon lines - ANSC. Refrigerant lines
A gas appliance flue should not be shared with an ____________. Note
this as a safety hazard.
A. kitchen exhaust
B. oil-fired appliance or fireplace
C. a gas appliance flue cannot be shared
D. sewage vent - ANSB. oil-fired appliance or fireplace
A system that heats the home using hot water or steam is called _______.
A. a heater
B. a boiler
C. a furnace
D. any of these - ANSB. a boiler
,An 80% efficiency rating for a gas-fired heating system would best describe
___________.
A. a conventional system
B. a high-efficiency system
C. a mid-efficiency system
D. a middle of the road system - ANSC. a mid-efficiency system
An air-conditioning system has four basic components:
A. freon distribution system, the compressor, condensate line and an
expansion device
B. the compressor, refrigerant line, an expansion device and power source
C. freon distribution system, condensate line, refrigerant line, power source
D. the compressor, a condenser, an evaporator, and an expansion device -
ANSD. the compressor, a condenser, an evaporator, and an expansion
device
An expansion tank in a hot water system ______________.
A. provides space for air to expand into
B. provides space for water to expand into
C. acts as an overflow for water
D. acts as an add-on for additional water - ANSB. provides space for water
to expand into
, An oil-fired furnace where the blower is at the bottom of the unit beneath
the burner is typically referred to as a _____________.
A. lazyboy
B. highboy
C. lowboy
D. tallboy - ANSB. highboy
At what pressure would the pressure relief valve open on a forced hot
water boiler?
A. 2 to 3 psi
B. 12 to 15 psi
C. 28 to 30 psi
D. water in a closed system is not under pressure - ANSC. 28 to 30 psi
Besides the thermostat, the main controls on a forced-air furnace are
____________.
A. the gas valve and the fan control
B. the temperature limit control and the pump control
C. the pump control and the evaporator
D. the temperature limit control and the fan control - ANSD. the
temperature limit control and the fan control
Dark staining on the walls above registers of a gravity furnace could be
indicative of ___________.