Ip Cards Refrigeration 4Th Year Sait

Front 1

Combined gas law

Back 1

P1(V1)/T1 = P2(V2)/T2 (must be in absolute)

Front 2

F to Rankin

Back 2

+460°F

Front 3

C to Kelvin

Back 3

+ 273°C

Front 4

Rankin to Kelvin

Back 4

÷1.8

Front 5

°C to °F

Back 5

(C × 1.8) + 32

Front 6

°F to °C

Back 6

(F-32) /÷ 1.8

Front 7

Water systems BTU measurement formula

Back 7

Q = 500 × GPM × ∆T (600 imperial)

Front 8

How many watts per BTU

Back 8

3.41

Front 9

Watts per HP

Back 9

746 Watts / 1 HP

Front 10

How many BTUs does one hour of cooling have

Back 10

12000 BTU

Front 11

Weight of one gallon of water

Back 11

8.33 Lbs. (10 imperial)

Front 12

How to get frequency

Back 12

(Rpm × 120) ÷ poles

Front 13

Ratio for ladders

Back 13

4:1

Front 14

Soldering temperatures

Back 14

400°F - 800°F

Front 15

Oil failure - is 3 wire hook up line or duty

Back 15

Line

Front 16

How are receivers sized

Back 16

90% full at 90°F

Front 17

Contacts of a current relay

Back 17

N/O

Front 18

Expansion of copper formula

Back 18

(x) feet of copper × 12(inches) × 0.0000104 x ∆T

Front 19

How much pressure drop per foot

Back 19

.5psi

Front 20

Sensible heat formula (air)

Back 20

Q(BTU) = 1.08 × CFM × ∆T

Front 21

Where is an air dryer located on a system

Back 21

Between the expansion tank and pressure regulator

Front 22

Where is the condensate line

Back 22

Condenser to receiver

Front 23

How to get pulley conversion

Back 23

Rpm1 × D1 = Rpm2 × D2

Front 24

How to get load for the day

Back 24

(3.41 × Watts × # of fans × hours running per day) ÷ 24hrs = load day

Front 25

Where would a mixing valve sensor be located for water chiller system

Back 25

After the pump

Front 26

How are MUAs sized

Back 26

Dry bulb in Dry bulb out

Front 27

How to you recover gas from a leaking system

Back 27

Recover to 5psi

Front 28

How to test high limit

Back 28

Block discharge air

Front 29

How are vibration absorbers placed with a compressors crankshaft

Back 29

Parallel

Front 30

What to put between RTU and Curb

Back 30

Foam Tape

Front 31

On a start up what should you ensure

Back 31

Crankcase heater is on , tight connections, correct voltage

Front 32

How to test oil failure control

Back 32

Isolate control voltage or isolate compressor

(I think compressor > control)

Front 33

What systems will a restricted flow cap tube show?

Back 33

Frost on first portion

Front 34

How to test chiller tubes

Back 34

Eddy currents

Front 35

FPM for MUAs complete combustion

Back 35

2500-3200FPM

Front 36

Solution in absorption chillers

Back 36

Lithium bromide

Front 37

Common highside refrigeration for chillers?

Back 37

R134a

Front 38

Max pressure for Acetylene

Back 38

15psi

Front 39

Site identifications

Back 39

Water sewer gas

Front 40

What do you use for compressor staging

Back 40

Suction head transducer

Front 41

Operating at 32F what's the lowest the micron gauge can go

Back 41

Lowest 4000 microns Highest 12000

Front 42

What temp does oil lose its lubrication properties

Back 42

300-320°F (350°F. it completely breaks down) for mineral

POE 400

Front 43

Cap tube length min/max

Back 43

6 foot min - 18 foot max

Front 44

How do you wire a current relay and with what capacitor

Back 44

Run is series with a run cap

Front 45

Potential relay how is it wired and what capacitor

Back 45

Run in parallel with a start cap

Front 46

Approach

Back 46

Difference between outlet and wetbulb (sst)

Front 47

What type of bulb charge do high capacity systems use

Back 47

Vapour bulb and externally equalized

Front 48

Holding charge for decommissioned or centrifugal unit

Back 48

Nitrogen

Front 49

Holding charge for freezer or ultra low

Back 49

R404a

Front 50

What kind of knot are used for lanyards

Back 50

Mechanical knot

Front 51

R290 why is it good

Back 51

Low environmental impact and nominal GWP

Front 52

Brine solution@ 0° f. What concentration of salt is needed to avoid freezing?

Back 52

0°f - 1.195

20°F - 1.225

Front 53

To get secondary transformer VA

Back 53

Turns2 × V1 = Turns1 × V2

Front 54

Latent heat calculation

Back 54

CFM × 4.5 × ∆h (enthalpy)

Front 55

How to get cross sectional(ft³) area of a duct

Back 55

(W × L) ÷ 144

Front 56

Grains of moisture per pound of dry air

Back 56

7000 grains

Front 57

Fan law 1

Back 57

RPM2 ÷ RPM1 = CFM2 ÷ CFM1

Front 58

Fan law 2

Back 58

(RPM2 ÷ RPM1)² = P2 ÷ P1

Front 59

Fan law 3

Back 59

(RPM2 ÷ RPM1)³ = HP2 ÷ HP1

Front 60

Vessels 10ft³ or larger require what

Back 60

Duel pressure relief

Front 61

How to get OA%

Back 61

OA% = (RA temp - MA temp) ÷ (RA temp - OA temp) × 100

Front 62

Interstage pressure

Back 62

√ discharge (psia) x suction (psia)

Front 63

Interstage CR

Back 63

√ discharge (psia) ÷ suction (psia)

Front 64

What oil is hygroscopic

Back 64

POE oil

Front 65

CFM per ton of cooling that is required

Back 65

400CFM

Front 66

How to get velocity

Back 66

√ vp × 4005

Front 67

Material most likely to plug a capillary tube in the first 6 inches

Back 67

Dessicant

Front 68

To test the seat of TXV for leaks, one would remove the valve from the system and pressure test the inlet or outlet and would you cool or warm the bulb?

Back 68

Outlet cool the bulb

Front 69

A double diaphragm TXV is a special application design too

Back 69

Limit suction pressure during high load conditions

Front 70

How will a reverse acting low pressure control work?

Back 70

Open on rise of pressure

Front 71

If a capillary to breaks on an electrical controller, what will happen to the contacts

Back 71

Open

Front 72

An externally equalized hot gas bypass regulated must be used if there is an appreciable pressure drop between the

Back 72

valve outlet and receiver

Front 73

The maximum temperature refrigerant in a container should be

Back 73

90°F

Front 74

Open circuit test for thermocouple

Back 74

17-32 mcvd

Front 75

Closed circuit test for thermocouple

Back 75

8-17 mcdv

Front 76

How much to derate a unit

Back 76

For every 1000ft , 2%

Front 77

How to get system capacity on a P.E chart

Back 77

MFR x NRE

Front 78

The rate at what material will transfer heat is known as the

Back 78

Conductivity or K value

Front 79

Resistance to heat flows represented by the

Back 79

R. Value

Front 80

What kind of losses are in an induction motor?

Back 80

Electrical (iron and copper loss) or mechanical (friction)

Front 81

% efficiency(power) =

Back 81

P out ÷ P in (x100)

Front 82

Maximum voltage imbalance should not exceed what percentage

Back 82

2%

Front 83

What design of rotors is the most common type?

Back 83

Design b

Front 84

What section of the b-52 code covers installation?

Back 84

Section 6

Front 85

Where are the two spots you can test a motor for vibration?

Back 85

The top of the motor closest to the shaft or the top of the motor for this point away from the shaft

Front 86

Where is the rotor current forced to flow?

Back 86

Through the bars, not in the laminations

Front 87

How many electrical degrees apart is three-phase voltage

Back 87

120°

Front 88

How many electrical degrees apart on single phase voltage?

Back 88

180°

Front 89

Type C charge

Back 89

50°F to -10°F

Front 90

Type Z charge

Back 90

0 to -40°F

Front 91

Type X Charge

Back 91

-40 to -100°F

Front 92

Superheat for AC

Back 92

8-12°F SH

Front 93

Superheat for medium temp refrigeration

Back 93

6-8°F SH

Front 94

Superheat for low temp

Back 94

4-6°F SH

Front 95

KPAg to KPAa

Back 95

+101.3

Front 96

LEED stands for

Back 96

Leadership in energy and environmental design

Front 97

ASHRAE stands for

Back 97

American society of heating, refrigeration and air conditioning engineers

Front 98

DX coil face velocity requirements

Back 98

400-600FPM

Front 99

The three key elements of WHMIS are

Back 99

Worker education

Product labelling

Materiel safety data sheets (MSDS)

Front 100

Total heat formula

Back 100

4.5 × CFM × ∆h (enthalpy)

Front 101

How to go PSIA to KPAA

Back 101

× 6.9 (nice)

Front 102

Damaged suction reed valves?

Back 102

Flooding / Slugging

Front 103

Damaged discharge reeds valves?

Back 103

Overheating

Front 104

How to slope a suction line

Back 104

1/2" per 10' - in direction of flow

Front 105

What do you use to cut cap tubes

Back 105

3 corner file

Front 106

What angle do you sharpen drill bits too

Back 106

12°

Front 107

Arc suits are rated in

Back 107

Cals

Front 108

Strongest type of rope?

Back 108

Manilla

Front 109

Humidity level comfortable for humans?

Back 109

30-60%

Front 110

Which of orthographic or isometric is 2D?

Back 110

Orthographic

(isometric is 3d)

Front 111

Liquid tight conduit requires what?

Back 111

A ground wire

Front 112

(calculating) Heat transfer formula

Back 112

Q = AUTD

Front 113

How to get R value for heat load calculation if given U

Back 113

1 ÷ U = R

Front 114

CFM requirements for condenser

Back 114

800 CFM

Front 115

Condensers must be how much larger than the evaporator?

Back 115

25%

Front 116

If the temperature is getting colder (for air or refrigeration) is it becoming more or less dense?

Back 116

More dense

think of the molecules being cold so they are huddled together (more dense) when it's warm they are zipping around making it less dense

Front 117

What is medium duct static pressure

Back 117

2-6 "wc

Front 118

What is high static pressure it ducts?

Back 118

6-10" wc

Front 119

What is low duct static pressure?

Back 119

2"WC and less

Front 120

Max pressure drop across evap?

Back 120

2°F

Front 121

If you put a knot in a rope how much does it decrease the strength?

Back 121

50%