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Year 3 knowledge test 2021 Flashcards | StudBud
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Year 3 knowledge test 2021
Year 3 knowledge test 2021
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Answers
1
how do you work out your system COP in cooling ?
RE + WD + HR
RE devided by WD
WD - RE
HR + RE
2
This Reclaim cylinder can be used for both A1 and A2L Refrigerants
True
False
3
what are points 1 to 2
expansion
refrigeration effect
work done
heat rejected
4
What type of valve is this ?
Capillory
TEV (External equalised)
TEV
EEV
5
A1 ON A CONTACTOR IS FOR L3 LIVE INCOMING POWER
True
False
6
What is used to determine when a Refrigerant leak check is required ?
GWP & C02 EQ value
Refrigerant KG value
GWP value
C02 EQ value
7
what is the state of refrigerant at the green arrow ?
Low pressure liquid
High pressure sub cooled liquid
High pressure vapour
Superheated vapour
8
what state is the refrigerant in the grey area ?
liquid
superheated vapour
vapour
sub cooled
9
You have an electrical power feed and a control circuit on a Refrigeration system
True
False
10
what's the state of refrigerant in the grey area ?
Liquid
Vapour
Hot Gas
Saturated mix
11
you can just vac out a system for 20-30 mins
True
False
12
What type of condenser is this ?
Shell & Tube
Plate
Evaporative
Tube in Tube
13
what are the UK colours for 3 phase
brown / black / grey
black / grey / brown
orange / pink / yellow
red /yellow/ blue
14
what do you need to control back pressure on a multi evap system
GBR
EPR
APR
solenoid valve
15
What is the state of refrigerant at the green arrow
High pressure superheated vapour
High pressure
low pressure
Low pressure liquid
16
When Using Electrical testers, what type of test leads do you need to use ?
GS38 Type
EN28 type
Any
SG38 type
17
What classification is R410a
B2L
A3
A2L
A1
18
IN CALCULATING DT1 WHAT IS THIS TELLING YOU ?
YOU HAVE TOO MUCH REFRIGERANT
YOU ARE USING 100% CAPACITY OF THE EVAP
condenser is blocked
YOU HAVE AIR IN THE SYSTEM
19
what is points 4 to 1
work done
expansion
heat rejected
refrigeration effect
20
how do you work out cut out setting for HP switch with PRV fitted
systems PS
what ever you think
PS x 0.9
PS x 1.0
21
what can cause an iced up evap
all of them
Lack of Air Flow
defrost not set up correctly
Door leaving opening
22
what type of compressor is this ?
Screw
Rotary
Reciprocating
Scroll
23
If my ambient temp is 30 Dec C what is this in Kelvin?
333
303.15
330
303
24
Ambient conditions have an effect on how efficent your system works
False
True
25
What is the MAX Fill on Reclaim cylinders for classification A1 refrigerants ?
80% of max fill
8kg
Max fill less 80%
10kg
26
What is commonly know as the hart of the system ?
Condenser
Compressor
Evaporator
TEV
27
What is the state of refrigerant at the green arrow
High pressure sub cooled vapour
Low pressure vapour
Low pressure superheated vapour
High pressure vapour
28
what is the state of Refrigerant in a reclaim cylinder
Subcooled liquid
Liquid
Saturated mix
Vapour
29
what type of condenser is this ?
Evaporative
Air cooled
tube in tube
Shell & Tube
30
A plate heat exchanger can be used as an evaporator or Condenser
False
True
31
You have to convert Pressure to absolute and temperature to Kelvin when using OFN pressure drop calculation?
False
True
32
Whats the state of refrigerant in the grey area ?
Sub cooled liquid
Vapour
Cool gas
Liquid
33
You can use R32 as a drop in for R410a Air conditioning systems ?
True
False
34
What is this ?
Contactor
3 PHASE PROTECTION RELAY
TIMER RELAY
OVERLOAD
35
When should brazing equipment such as regulators and hoses be replaced ?
every 5 years or sooner if damaged
every 3 years
never they will be fine
when they are damaged
36
On finding a leak during a F-gas leak check can be left until you are next in the area ?
False
True
37
what points do you use to work out your net refrigeration effect ?
point 2 - point 3
point 1 - point 4
point 3 - point 4
point 1 - point 2
38
A system that has lost some of its zeotropic charge can just be topped up?
True
False
39
what is happening here
Liquid flood back
compressor cold
Nothing working fine
extremely cold outside
40
What is this ?
electrical box
Tube in tube heat exchanger
Plate heat exchanger
musical instrument
41
What is the calculation to determine a pressure drop with OFN ?
P1= (P1 x T2) / T1
P1= (P2 x T1) / T2
P2= (P1 x T2) / T1
P2= (P1 x T1) / T2
42
As from January 2017 what information was required to be but on systems containing greenhouse gases ?
Refrigerant KG & Type of Refrigerant
C02 Eqv
GWP
All Of them
