C20 TEST 2 Exam Questions And 100%
Verified Answers | Latest 2025/ 2026
Update | Graded A+
When adjusting a pulley on a belt drive fan and the distance between
the flanges is increased, what happens to the speed of the blower?
it gets faster
it gets slower
nothing, it stays the same
it won't run - CORRECT ANSWER-it gets slower
The area of a chimney used with an oil-fired furnace should be at least
_____ larger than the area of the flue outlet.
10%
15%
20%
25% - CORRECT ANSWER-20%
,A fan motor in an air-conditioning unit is burned out. The motor doesn't
have a nameplate, but you know that the motor has six poles. This
means that the synchronous speed for this motor is most likely to be: -
CORRECT ANSWER-1200 rpm
Uninsulated furnace flue pipes should have a minimum clearance of
_____ from any combustible materials. - CORRECT ANSWER-6 in
What is the minimum distance a metal ladder must be from open
electrical wires? - CORRECT ANSWER-4ft
Why would aluminum wire be used instead of copper wire? - CORRECT
ANSWER-less expensive
In a work place, travel distance to a fire extinguisher must not be more
than: - CORRECT ANSWER-75 ft
,Which of the following is permitted by code?
connecting a furnace with a vent transit
connecting two gravity vents together
venting a clothes dryer to the subfloor
venting a clothes dryer to a utility room - CORRECT ANSWER-connecting
two gravity vents together
The flow of hot water through piping is controlled by a pneumatic valve.
The set point is 72°F and the water temperature is 74°F. Which of the
following is a correct statement?
the valve is fully open
the valve is fully closed
the valve is partially open
the valve must open and close quickly - CORRECT ANSWER-the valve is
partially open
, What is the difference between batt and blanket insulation? - CORRECT
ANSWER-length
Modern houses are designed for an inside temperature of _____ in the
winter. - CORRECT ANSWER-68F
A central heating furnace that is not listed for a closet or alcove
installation must be installed in a room or space having a volume of at
least _____ times the total volume of the furnace. - CORRECT ANSWER-
12
When a furnace burner fails to stop, what is the most likely cause? -
CORRECT ANSWER-a bad thermostat
Medical and monitoring records regarding asbestos exposure at a
workplace must be kept for: - CORRECT ANSWER-30 years
Verified Answers | Latest 2025/ 2026
Update | Graded A+
When adjusting a pulley on a belt drive fan and the distance between
the flanges is increased, what happens to the speed of the blower?
it gets faster
it gets slower
nothing, it stays the same
it won't run - CORRECT ANSWER-it gets slower
The area of a chimney used with an oil-fired furnace should be at least
_____ larger than the area of the flue outlet.
10%
15%
20%
25% - CORRECT ANSWER-20%
,A fan motor in an air-conditioning unit is burned out. The motor doesn't
have a nameplate, but you know that the motor has six poles. This
means that the synchronous speed for this motor is most likely to be: -
CORRECT ANSWER-1200 rpm
Uninsulated furnace flue pipes should have a minimum clearance of
_____ from any combustible materials. - CORRECT ANSWER-6 in
What is the minimum distance a metal ladder must be from open
electrical wires? - CORRECT ANSWER-4ft
Why would aluminum wire be used instead of copper wire? - CORRECT
ANSWER-less expensive
In a work place, travel distance to a fire extinguisher must not be more
than: - CORRECT ANSWER-75 ft
,Which of the following is permitted by code?
connecting a furnace with a vent transit
connecting two gravity vents together
venting a clothes dryer to the subfloor
venting a clothes dryer to a utility room - CORRECT ANSWER-connecting
two gravity vents together
The flow of hot water through piping is controlled by a pneumatic valve.
The set point is 72°F and the water temperature is 74°F. Which of the
following is a correct statement?
the valve is fully open
the valve is fully closed
the valve is partially open
the valve must open and close quickly - CORRECT ANSWER-the valve is
partially open
, What is the difference between batt and blanket insulation? - CORRECT
ANSWER-length
Modern houses are designed for an inside temperature of _____ in the
winter. - CORRECT ANSWER-68F
A central heating furnace that is not listed for a closet or alcove
installation must be installed in a room or space having a volume of at
least _____ times the total volume of the furnace. - CORRECT ANSWER-
12
When a furnace burner fails to stop, what is the most likely cause? -
CORRECT ANSWER-a bad thermostat
Medical and monitoring records regarding asbestos exposure at a
workplace must be kept for: - CORRECT ANSWER-30 years
