hvac apprenticeship practice exam questions with e
Geschreven voor
2024- 2025 prep test
2024- 2025 prep test
2024- 2025 prep test
Alle documenten voor dit vak (107)
Verkoper
Volgen
ACTUALSTUDY
Ontvangen beoordelingen
Voorbeeld van de inhoud
HVAC Apprenticeship Practice Exam
The main purpose of the accumulator is to: - ANS-Prevent liquid slugs at the compressor
Heat that changes the physical state of a substance without effecting a change in its
temperature is known as: - ANS-Latent heat
The location of the thermal bulb for the TXV on the evaporator affects: - ANS-The amount of
liquid in the evaporator
If the spring is adjusted to increase the superheat, this new setting will: - ANS-Shorten the frost
line
The amount of heat required to raise the temperature of 1 lb of water 1°F is: - ANS-1 Therm
The low pressure oil safety switch: - ANS-Must be reset manually
Suction line oil traps should be installed when the condenser is: - ANS-On the third floor roof
and the evaporator is in the basement
The proper location for an oil separator is between the: - ANS-compressor and condenser
On a TXV, the purpose of an external equalizer is to: - ANS-Compensate for a pressure drop
across the evaporator coil
The approximate boiling point of R-12 at atmospheric pressure at sea level is: - ANS--21°F
The freezing point of water is - ANS-32°F
Crankcase heaters are energized - ANS-When the compressor is of
An accumulator can be located between the - ANS-Evaporator and compressor
On a central air conditioning system, a frosted suction line at the compressor inlet
indicates - ANS-Low back pressure
The normal temperature of the liquid in an air conditioning evaporator is - ANS-35 to 40°F
In an A/C unit, dirty air filters will cause - ANS-Low suction pressure
The reversing valve is commonly used - ANS-On all heat pumps
, If the suction pressure is low and the evaporator temperature high, the cause will be a -
ANS-Starved evaporator
A gage commonly used to measure the pressure in a system while it is being dehydrated is the -
ANS-Micron millimeter gage
When an A/C system is excessively low on refrigerant - ANS-It can become contaminated with
water
There can be nuisance trip outs
The suction line may be too hot to touch
[ALL OF THE ABOVE]
When an A/C system is excessively low on refrigerant - ANS-Low on refrigerant
Dirty air filter
[BOTH A & B]
While the system is operating, the discharge line should be - ANS-At the same temperature as
the crankcase
The most common method used to determine superheat is accomplished by - ANS-Using the
suction gage and a pressure temperature chart and taking a thermometer reading under the
suction line insulation near the gage port
The biggest problem caused by moisture in the refrigeration system is - ANS-Burned out
compressor motors
When used as a drier in the liquid line, silica gel - ANS-Dehydrates water
When is a condensate trap not required - ANS-When the condensate drain is on the discharge
side of the blower
An instrument used to indicate humidity conditions is a - ANS-Hygrometer
Excessive head pressure is often caused by - ANS-Air cooled condenser is plugged
What is the suction gas temperature of R-22 if the pressure is measured as 68 psig - ANS-40°F
With a 5/8" x 5/8" x ¾" tee, what size is the center connection - ANS-¾"
Why is the suction line insulated - ANS-To prevent excessive heat gain
To prevent water damage from condensate on line
[BOTH A & B]
Voordelen van het kopen van samenvattingen bij Stuvia op een rij:
Verzekerd van kwaliteit door reviews
Stuvia-klanten hebben meer dan 700.000 samenvattingen beoordeeld. Zo weet je zeker dat je de beste documenten koopt!
Snel en makkelijk kopen
Je betaalt supersnel en eenmalig met iDeal, creditcard of Stuvia-tegoed voor de samenvatting. Zonder lidmaatschap.
Focus op de essentie
Samenvattingen worden geschreven voor en door anderen. Daarom zijn de samenvattingen altijd betrouwbaar en actueel. Zo kom je snel tot de kern!
Veelgestelde vragen
Wat krijg ik als ik dit document koop?
Je krijgt een PDF, die direct beschikbaar is na je aankoop. Het gekochte document is altijd, overal en oneindig toegankelijk via je profiel.
Tevredenheidsgarantie: hoe werkt dat?
Onze tevredenheidsgarantie zorgt ervoor dat je altijd een studiedocument vindt dat goed bij je past. Je vult een formulier in en onze klantenservice regelt de rest.
Van wie koop ik deze samenvatting?
Stuvia is een marktplaats, je koop dit document dus niet van ons, maar van verkoper ACTUALSTUDY. Stuvia faciliteert de betaling aan de verkoper.
Zit ik meteen vast aan een abonnement?
Nee, je koopt alleen deze samenvatting voor €7,71. Je zit daarna nergens aan vast.