WorksheetsHeat
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
What percentage of total energy consumption in a typical commercial building is due to ACMV systems?
a)
0.4
b)
0.5
c)
0.6
d)
0.7
2.
Which law explains that heat always transfers from higher to lower temperatures?
a)
First Law of Thermodynamics
b)
Second Law of Thermodynamics
c)
Law of Conservation of Energy
d)
Law of Entropy
3.
What is the role of the compressor in an air-conditioning system?
a)
Cools the air
b)
Increases refrigerant pressure
c)
Condenses refrigerant
d)
Distributes air
4.
What component absorbs heat from the room in an ACMV system?
a)
Compressor
b)
Condenser
c)
Evaporator
d)
Cooling tower
5.
What does the cooling coil in an air conditioning system do?
a)
Heats the air
b)
Filters the air
c)
Condenses the refrigerant
d)
Absorbs heat and changes refrigerant to gas
6.
The condenser in an ACMV system functions to:
a)
Circulate air
b)
Compress refrigerant
c)
Remove heat and condense refrigerant
d)
Produce chilled water
7.
What device reduces the pressure of the refrigerant before it enters the evaporator?
a)
Compressor
b)
Evaporator
c)
Thermostatic Expansion Valve (TEV)
d)
Condenser
8.
Which fluid is responsible for heat absorption and cooling in a refrigeration system?
a)
Water
b)
Coolant
c)
Refrigerant
d)
Steam
9.
What is the purpose of the Air Handling Unit (AHU)?
a)
Store refrigerant
b)
Circulate chilled water
c)
Filter and condition air
d)
Control humidity only
10.
What is the typical supply air temperature after cooling in the AHU?
a)
12°C
b)
15°C
c)
20°C
d)
27°C
11.
Which type of fan is typically used to blow conditioned air into rooms?
a)
Axial fan
b)
Box fan
c)
Centrifugal fan
d)
Tower fan
12.
How much is the chilled water temperature reduced in the shell and tube heat exchanger?
a)
10°C to 2°C
b)
12°C to 6°C
c)
20°C to 10°C
d)
15°C to 5°C
13.
What controls the flow of chilled water in response to room temperature?
a)
Compressor relay
b)
Manual valve
c)
Chilled water flow control valve
d)
Evaporator coil
14.
What does a VFD (Variable Frequency Drive) do in an ACMV system?
a)
Heats the air
b)
Controls refrigerant temperature
c)
Reduces pump speed to save energy
d)
Increases airflow velocity
15.
Where are compressors typically located?
a)
Near air outlets
b)
In the ceiling
c)
On the roof or in the plant room
d)
Inside the AHU
16.
What type of refrigerant is commonly used in energy-efficient systems?
a)
CFC-12
b)
HFC-134a
c)
Ammonia
d)
Methane
17.
What is the function of a cooling tower in the refrigeration cycle?
a)
Cools air inside the building
b)
Reduces room humidity
c)
Rejects heat from the condenser to the atmosphere
d)
Circulates refrigerant
18.
What is used to control bacteria growth in condenser cooling water?
a)
Chlorine
b)
Bleach
c)
Biocide chemicals
d)
Ozone
19.
What is the pressure of the refrigerant vapor after being compressed?
a)
2.0 bar
b)
5.0 bar
c)
10.0 bar
d)
15.0 bar
20.
What happens to refrigerant as it passes through the TEV?
a)
It heats up
b)
It evaporates
c)
It becomes solid
d)
It expands and cools
100 %
