Module 2 Missed Test Questions (2) Flashcards
When inspecting air conditioning, you are required to inform the client:
a. age of unit
b. capacity of unit
c. circuit breaker amperage exceeds the listed maximum amperage for the unit
circuit breaker amperage exceeds the listed maximum amperage for the unit
When measuring the supply temp in a convectional A/C unit, if the range is less than _ or greater than _, there is probably something wrong
a. 15 degrees & greater than 25 degrees
b. 12 degrees & greater than 22 degrees
c. 10 degrees & greater than 15 degrees
15 degrees & greater than 25 degrees
How many evaporator/air handlers can a ductless split system’s exterior condenser unit serve?
a. 2-3
b. 4-5
c. Not more than 3
4-5
Which of the following is true of high velocity A/C systems?
a. Hi-V systems are more flexible systems than systems with conventional large ductwork
b. Hi-V systems provide less efficient moisture removal than conventional systems
c. Hi-V systems are more difficult to install than systems with conventional ductwork.
Hi-V systems are more flexible systems than systems with conventional large ductwork
What is the last thing you should do when inspecting an air source heat pump?
a. the condensate drain
b. make sure it sounds ok when it is operating
c. the condition of the interior air handler and line set
make sure it sounds ok when it is operating
While a heat pump can be operated at any temperature in cooling mode, what degree is the benchmark when testing?
a. 50 degrees
b. 60 degrees
c. 70 degrees
60 degrees
At what temperature is the compressor no longer able to create sufficient heat (balance point)?
a. 30 degrees
b. 35 degrees
c. 32 degrees
30 degrees
Geothermal installation cost are _ the cost of conventional HVAC, but the additional cost is returned in _ years.
a. 1-2 times, 5-15 years
b. 2-3 times, 5-10 years
c. 3-4 times, 5-15 years
3-4 times, 5-15 years
What temperature can a heat pump be operated in cooling mode?
a. a heat pump can be operated in cooling mode at any temperature
b. 50 degrees
c. 60 degrees
a heat pump can be operated in cooling mode at any temperature
Evaporative coolers operate by evaporating water and moving air to reduce indoor temperatures in dry climates up to _ degrees.
a. 20
b. 30
c. 35
30
Using Ohm’s law, which of the following scenario is NOT an acceptable circuit load for a single outlet that is 15-amp, 120-volt circuit?
a. a client cannot run a coffeemaker (900 watts) and a microwave (1200 watts) on same outlet
b. a client can run a coffeemaker (900 watts) and a microwave (1200 watts) on the same outlet
c. a client can run an electric oven (1000 watts) and a microwave (800 watts) on same outlet
a client can run a coffeemaker (900 watts) and a microwave (1200 watts) on the same outlet
Which of the following is/are the proper wire gauge on branch circuits
a. 14 AWG on 15-amp breaker fuse
b. 12 AWG on 20-amp breaker fuse
c. 10 AWG on 30-amp breaker fuse
d. 8 AWG on 40-amp breaker fuse
e. all of the above
all of the above
Ground fault circuit interrupter (GFCI) save lives because they limit the duration of an electrical shock to about
a. 1/10th of a second
b. 1/40th of a second
c. 1/50th of a second
1/40th of a second
Which of the service entrance cables GEC (main ground wire) size & amperage is/are accurate?
a. 125 amps or less/min 8 g copper (#6 al)
b. 150 amps or less/min 8 g copper (#6 al)
c. 200 amps/min 2 g copper (#4 al)
125 amps or less/min 8 g copper (#6 al)
Which of the following is NOT accurate about armor & metal clad cable?
a. armored cable, type AC is commonly known as BX and used since the early 1900s
b. Type BX has been used since the late 1950s
c. Metal clad cable, type MC is very common in residential
Metal clad cable, type MC is very common in residential
Which type of silicon-based cells used in photovoltaics has the most longevity?
a. monocrystalline
b. silicon-based cells used in photovoltaics have around the same longevity
c. thin film
silicon-based cells used in photovoltaics have around the same longevity
Based on the National Fire Protection Association (NFPA), using what they tell us is unconfined space, calculate the required minimum square footage for a 100,000 BTU furnace with a 34,000 BTU water heater right next to it.
a. 838 sqft
b. 738 sqft
c. 638 sqft
838 sqft
The sight glass or gauge glass normal water starting level is about 1/2 to 2/3 full, while the normal operating level is about _
a. 1/2 to 2/3 full
b. 1/3 full or less
c. 1/3 full or more
1/3 full or less
Wood stoves should sit on a non-combustible hearth, which extends at least _ inches out from the front of the stove and _ at the sides and rear
a. 12 inches, 10 inches
b. 14 inches, 8 inches
c. 18 inches, 8 inches
18 inches, 8 inches
Which of the following plumbing supply piping is only for cold water service & distribution?
a. Polyvinyl Chloride (PVC)
b. CPVC
c. PB
Polyvinyl Chloride (PVC)
Horizontal metal pipe for copper is 1 in diameter or less should be supported every _. If it is 1 1/4” in diameter, it should be supported every _.
a. 4ft, 6ft
b. 8ft, 10ft
c. 10ft, 12ft
8ft, 10 ft
Which type of gas piping must be labeled with size and usage?
a. corrugated stainless steel (CSST)
b. polybutylene (PB)
c. copper
corrugated stainless steel (CSST)
Crawl space ventilation requires ventilation openings to be within _ of each corner of the building
a. 1ft
b. 3ft
c. 5ft
3ft
If a crawl space has exhaust-powered ventilation, the continuous mechanical exhaust ventilation should operate at a rate equal to 1 cubic foot per minute for each __ or crawl space floor area, including an air pathway to the common area, such as a duct to transfer grille & perimeter walls insulated
a. 25 sqft
b. 50 sqft
c. 75 sqft
50 sqft
If there is a plenum in the crawlspace, access to an underfloor plenum shall be provided through an opening in the floor w/minimum dimensions of _
a. 14 in by 20 in
b. 18 in by 24 in
c. 20 in by 24 in
18 in by 24 in
Attic vent ventilation opening should have at least dimensions of a 1/16 in minimum & _ maximum opening.
a. 1/8”
b. 1/2”
c. 1/4”
1/4”