100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
NATE Exam: Air Conditioning and Heat Pumps Questions With 100%Verified AnswersA+GRADED $9.39   Add to cart
Quickly navigate to
Preview
  2.  
  3. Course NATE
  4.  
  5. Course NATE

Exam (elaborations)

NATE Exam: Air Conditioning and Heat Pumps Questions With 100%Verified AnswersA+GRADED
 15 views  0 purchase
  • Course
  • Course NATE
  • Institution
  • Course NATE

NATE Exam: Air Conditioning and Heat Pumps Questions With 100%Verified AnswersA+GRADED Which of the following factors affects a customer's level of comfort? a. Air movement b. Humidity c. Temperature d. All of the above - correct answer...d (All of the above: air movement, humidity, temper...

[Show more]

Preview 3 out of 19  pages

Document information

  • August 6, 2024
  • 19
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • nate exam air conditioning and heat pumps questio

Written for

  • Course NATE
  • Course NATE

Seller

avatar-seller
agradesolutions

Reviews received

Content preview

NATE Exam: Air Conditioning and Heat
Pumps Questions With 100%Verified
AnswersA+GRADED
Which of the following factors affects a customer's level of comfort?

a. Air movement
b. Humidity
c. Temperature
d. All of the above - correct answer...✔✔d (All of the above: air movement, humidity,
temperature)

A cooling load calculation estimates the sensible heat gain of a structure. The maximum
sensible capacity of a cooling-only system should be within ____% of this calculated
value.

a. ±10%
b. +10%
c. +15%
d. +30% - correct answer...✔✔c (+15%)

The maximum sensible cooling capacity of a heat pump should be within ____% of the
calculated sensible heat gain of a structure with a large heating load.

a. ±10%
b. +15%
c. -25%
d. +25% - correct answer...✔✔d (+25%)

The combined output of a heat pump and its auxiliary heat should not exceed the
calculated heat loss of a home by more than ____%.

a. 10%
b. 15%
c. 20%
d. 25% - correct answer...✔✔b (15%)

What amount of auxiliary electric heat is needed when the output of a heat pump on a
design day equals 18,800 Btuh and the heat loss of a home is 29,700 Btuh?

a. 2.1 kWh
b. 3.2 kWh
c. 5.0 kWh


A GRADESOLUTIONS

,d. 10.9 kWh

Note: 3,413 Btu/kW - correct answer...✔✔b (3.2 kWh)

The three processes that transfer heat energy are conduction, convection, and ____.

a. concentration
b. radiation
c. refraction
d. static pressure - correct answer...✔✔b (radiation)

Heat transfer that occurs when substances of different temperatures are in contact with
each other is called ____.

a. concentration
b. conduction
c. convection
d. radiation - correct answer...✔✔b (conduction)

What effect does raising the pressure in a sealed system have on refrigerant?

a. It becomes more difficult to subcool the liquid refrigerant
b. It becomes more difficult to superheat the refrigerant vapor
c. The refrigerant's boiling point decreases
d. The refrigerant's boiling point increases - correct answer...✔✔d (The refrigerant's
boiling point increases)

What is the primary danger to people near an accidental refrigerant release or spill?

a. Blurred vision caused by the refrigerant vapor coming in contact with the eyes
b. Changes in weather patterns caused by global warming
c. Damage to the food chain caused by decreased ozone levels in the stratosphere
d. Suffocation caused by the heavier refrigerant displacing oxygen in the air - correct
answer...✔✔d (Suffocation caused by the heavier refrigerant displacing oxygen in the
air)

The maximum temperature at which refrigerant may be stored is ____°F when the
container is no more than ____% full of liquid by volume.

a. 120°F, 60%
b. 125°F, 60%
c. 125°F, 80%
d. 135°F, 80% - correct answer...✔✔c (125°F, 80%)

Boiling of the refrigerant occurs in which system component?



A GRADESOLUTIONS

, a. Compressor
b. Condenser
c. Evaporator
d. Metering device - correct answer...✔✔c (Evaporator)

Why is superheat necessary in a system that utilizes hermetic compressors?

a. It ensures that dry vapor reaches the compressor so that mechanical damage does
not occur
b. It increases system capacity
c. It prevents liquid refrigerant from gassing the metering device
d. Superheat is necessary only when open compressors are being used - correct
answer...✔✔a (It ensures that dry vapor reaches the compressor so that mechanical
damage does not occur)

When the heat load on an evaporator increases, what is the effect on the system?

a. Suction pressure decreases and discharge pressure increases
b. Suction pressure increases and discharge pressure decreases
c. Suction pressure and discharge pressure both decrease
d. Suction pressure and discharge pressure both increase - correct answer...✔✔d
(Suction pressure and discharge pressure both increase)

What type of energy is transferred when work is done in the condenser?

a. Latent heat energy
b. Sensible heat energy
c. Both latent and sensible heat energy
d. Neither latent nor sensible heat energy - correct answer...✔✔c (Both latent and
sensible heat energy)

What is the primary function performed by a thermal expansion valve?

a. It maintains the correct superheat in the hot vapor leaving the compressor
b. It maintains the correct superheat in the suction vapor leaving the evaporator
c. It maintains the proper subcooling level in the liquid refrigerant
d. It prevents flash vapor bubbles from developing in refrigerant entering the evaporator
- correct answer...✔✔b (It maintains the correct superheat in the suction vapor leaving
the evaporator)

Which component pumps refrigerant through the system and raises the vapor
temperature?

a. Accumulator
b. Compressor
c. Condenser


A GRADESOLUTIONS

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller agradesolutions. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $9.39. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

64438 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$9.39
  • (0)
  Add to cart