Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Red Seal IP > Notes > Flashcards

Notes Flashcards

1
Q

If an oil pressure control should open due to lack of oil pressure, the voltage reading across the L and M terminals would read, if the supplied control voltage were 240v

a) 240v
b) 120v
c) 0v
d) 24v

A

a)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

During evacuation, when should the gas ballast on a vacuum pump be closed?

a) only be open during venting of pressure from system
b) closed as soon as vacuum starts to pull
c) has no effect on operation
d) closed near the end of the vacuum process

A

d)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How to check if your level is level?

A

Use high point of floor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Open the gas ballast on your vacuum pump until the system reaches?

A

1000-3000 microns

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What do you do to your vacuum pump when you go on vacation?

A

change oil and top it up higher than regular

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Which is thicker?

valve plate gasket or cylinder head gasket?

A

valve plate gasket

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the way to clean up the water lines in a shell and coil water cooled condenser?

A

chemicals only

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Start sequence for a water cooled condenser AC unit?

A

Fan, water pump, compressor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How to cut capillary tube?

A

use a file and bend to break tube do not damage inside diameter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Name the four types of distribution duct systems

A

Radial
Extended plenum
Reducing trunk
Perimeter loop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Name 5 types of nonmetal ducts

A

fiberglass
urethane
plastic
sheetrock
textile

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

True or False? It is illegal to put screws in duct work

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the R value used to describe?

A

rate the thermal resistance of insulation materials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The higher the R value, the ________ it is for heat to pass through the material

A

higher

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

If walls are made up of different materials, how is the R value calculated?

A

Each material’s R value is added to create a total R

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The amount of heat that will pass through 1ftsq of material 1’’ thick in 1 hour when the temperature difference is 1F is known as ?

A

Thermal conductivity (K value)

16
Q

High __ values indicate high rate of heat transfer

A

K

17
Q

Amount of heat that will pass through 1ftsq of material that is NOT 1’’ thick in 1 hour when the temperature difference is 1F is known as?

A

C value

18
Q

What is the difference between C and K values

A

K value is based on material that IS 1’’ thick.

C value is based on material that is NOT 1’’ thick

19
Q

How to determine thermal conductance?

A

Find on chart and divide K value of each material by its thickness

20
Q

When the compressor has adequate oil pressure the contacts between L and M are

a) open
b) closed
c) closed then open
d) open then closed

A

B

21
Q

A term used to rate vacuum pumps is used to describe the pumps ability to draw a vacuum. Pump must create a vacuum within itself that is lower than a system, so that gases will flow from system to the pump. Point at which the pump can no longer create a pressure difference is the

a) dead head pressure
b) blank off pressure
c) blocked tight static pressure
d) point of no pressure difference

A

b

22
Q

An imperial gallon of water weighs

a) 8.33lb
b) 10lb
c) 62.4lb
d) 64.2lb

A

b

23
Q

Superheat is bad and only for mainly protecting?

A

compressor

24
Q

Low ambient conditions lower head pressure which means less push of liquid into which component?

A

metering device

25
Q

1deg of subcooling gives ___ more liquid and more cooling.

A

0.5

26
Q

What is the liquid to vapour ratio in evap?

A

75 liquid to 25 vapour

27
Q

Which type of oil is most hygroscopic?

A) POE
b) Mineral

A

A

28
Q

Minimum and max air velocities and what will they cause if they are above or below the minimum requirements?

A

Between 20 to 65 FPM

  • less than 20 you get stratification
  • more than 65 you get drift
29
Q

List four types of propeller fans;

  1. ___ disk
  2. ____ wheel (axial flow)
  3. ____ axial (spiral discharge)
  4. ____ axial (laminar discharge)
A
  1. fan disk
  2. fan wheel
  3. tube axial
  4. vane axial
30
Q

What does laminar mean?

A

straight flow

31
Q

List four types of impeller or centrifugal fans?

A
  1. backward inclined
  2. air foil
  3. backward curved
  4. forward curved
  5. radial
  6. fan wheel

Red Seal IP (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions