UNIT 3 & 4 : Air-Conditioning System Maintenance

The important action to be done before maintenance of condensing unit is

• check the unit.
• check the area.
• Isolate the power supply.
• Isolate the MCB.

The equipment use to check electrical component in the condensing unit is a/an

• Rachet tools.
• Multi-meter.
• Test pen.
• Spanner.

The equipment below is use to check

• only the AC current flow in electrical circuits.
• the line of current flow in electrical circuits.
• for AC or DC pressure in electrical circuits
• for AC or DC of electrical component

The equipment below is a/an

• Ampere meter.
• Hydrometer.
• Digital multi meter.
• Analog multi meter.

For Analog multi meter, it does

• have a selector switch or knob allows the changing of various function (volts, ohms, amps) and scale (x1, x10, etc.) of the meter.
• have a selector switch or knob allows the changing of various function (psi, amp. degrees) and scale (x1, x10, etc.) of the meter.
• not have a selector switch or knob allows the changing of various function (volts, ohms, amps) and scale (x1, x10, etc.) of the meter.
• not have a selector switch or knob allows the changing of various function (kilo.ml, ls) and scale (x1, x10, etc.) of the meter.

What type of Multi meter need to do “zero adjustment” of the pointer is required before proceeding with any readings

• Digital Multi meter.
• Analog Multi meter.
• Ampere meter.
• Voltage meter.

What type of meter, need to estimate the resistance value and set the measuring range by x1, x 10, x100 and x1K or more.

• Digital Multi meter.
• Analog Multi meter.
• Ampere Multi meter.
• Voltage Multi meter.

When using the multi meter to measure AC or DC, and to ensure not damaging the multi-meter, the selection of correct

• knob is very important.
• battery of measurement is very important.
• scale of measurement is very important.
• multi meter of measurement is very important.

Selecting the lower range to measure a high voltage will lead to

• correct multi-meter.
• damage the multi-meter.
• wrong multi-meter.
• correct reading of the multi-meter.

Accidently touching electrical wiring while working with equipment above 50 volt will lead to

• serious injury.
• breakdown of equipment.
• mild short circuit.
• damage multi-meter.