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WorksheetsUNIT 3 & 4 : Air-Conditioning System Maintenance
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
The important action to be done before maintenance of condensing unit is
a)
check the unit.
b)
check the area.
c)
Isolate the power supply.
d)
Isolate the MCB.
2.
The equipment use to check electrical component in the condensing unit is a/an
a)
Rachet tools.
b)
Multi-meter.
c)
Test pen.
d)
Spanner.
3.
The equipment below is use to check
a)
only the AC current flow in electrical circuits.
b)
the line of current flow in electrical circuits.
c)
for AC or DC pressure in electrical circuits
d)
for AC or DC of electrical component
4.
The equipment below is a/an
a)
Ampere meter.
b)
Hydrometer.
c)
Digital multi meter.
d)
Analog multi meter.
5.
For Analog multi meter, it does
a)
have a selector switch or knob allows the changing of various function (volts, ohms, amps) and scale (x1, x10, etc.) of the meter.
b)
have a selector switch or knob allows the changing of various function (psi, amp. degrees) and scale (x1, x10, etc.) of the meter.
c)
not have a selector switch or knob allows the changing of various function (volts, ohms, amps) and scale (x1, x10, etc.) of the meter.
d)
not have a selector switch or knob allows the changing of various function (kilo.ml, ls) and scale (x1, x10, etc.) of the meter.
6.
What type of Multi meter need to do “zero adjustment” of the pointer is required before proceeding with any readings
a)
Digital Multi meter.
b)
Analog Multi meter.
c)
Ampere meter.
d)
Voltage meter.
7.
What type of meter, need to estimate the resistance value and set the measuring range by x1, x 10, x100 and x1K or more.
a)
Digital Multi meter.
b)
Analog Multi meter.
c)
Ampere Multi meter.
d)
Voltage Multi meter.
8.
When using the multi meter to measure AC or DC, and to ensure not damaging the multi-meter, the selection of correct
a)
knob is very important.
b)
battery of measurement is very important.
c)
scale of measurement is very important.
d)
multi meter of measurement is very important.
9.
Selecting the lower range to measure a high voltage will lead to
a)
correct multi-meter.
b)
damage the multi-meter.
c)
wrong multi-meter.
d)
correct reading of the multi-meter.
10.
Accidently touching electrical wiring while working with equipment above 50 volt will lead to
a)
serious injury.
b)
breakdown of equipment.
c)
mild short circuit.
d)
damage multi-meter.
11.
The picture below shown a
a)
voltage checking.
b)
parallel checking.
c)
resistance checking.
d)
power checking.
12.
If an evaporator fan blower bearing wears off it will create
a)
a far air throw.
b)
smooth air blow.
c)
non-stop air flow.
d)
an unbearable noise.
13.
Noise from the residential Air-conditioner condenser (outdoor unit) is caused by
a)
secure compressor.
b)
strong bracket supports.
c)
condenser bolted tightly.
d)
broken fan motor bearing.
14.
What should be done when there is noise at the indoor unit blower motor?
a)
The indoor unit fin must be clean.
b)
The bearing at the flap must be change.
c)
The indoor unit cover must be secure properly.
d)
The bearing must be lubricated with lubricating oil.
15.
Noise created by the vacuum cleaning machine is called
a)
Sound power.
b)
Sound pressure
c)
Sound source.
d)
Sound causes
16.
The figure below is used for
a)
voltage.
b)
Pressure
c)
velocity
d)
Sound
17.
High noise level eg. Above 100 decibel can cause
a)
Heart attack
b)
High Stroke
c)
Hearing injury
d)
High sensation
18.
The SI unit for sound is
a)
Volt.(V)
b)
Decibel.(Db)
c)
Hertz.(Hz)
d)
Amphere.(I)
19.
The SI unit for frequency is
a)
Volt.(V)
b)
Decibel.(Db)
c)
Hertz.(Hz)
d)
Amphere.(I)
20.
The function of a compressor in an aircon system is to
a)
to compress low pressure vapour to high pressure vapour
b)
to compress high pressure vapour to low pressure vapour
c)
to compress low pressure liquid to high pressure liquid
d)
to compress high pressure liquid to low pressure liquid
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