Soalan HVAC

What is the main tool for measuring high and low pressure in HVAC systems?

• Multimeter

• Manifold gauge

• Thermometer

• Vacuum pump

Nitrogen gas is used in pressure testing because:

• It is flammable

• It is cheap and toxic

• It is non-reactive and safe

• It replaces oxygen

The ideal vacuum reading after the vacuum process is:

• 0 psi

• 760 mmHg

• 500 microns

• 10 bar

What is the purpose of leak testing in HVAC systems?

• To add oil

• To prevent refrigerant gas loss

• To increase temperature

• To check voltage

What tool is used to detect electrical current on a compressor?

• Manifold gauge

• Clamp meter

• Voltmeter

• Thermocouple

Why does the HVAC system need to be vacuum tested?

• To add oxygen

• To remove moisture and air

• To cool the gas

• To test pressure

The tool used to check temperature is:

• Clamp meter

• Voltmeter

• Thermometer

• Multimeter

What is the consequence of not performing pressure testing correctly?

• System is more efficient

• No effect

• Risk of leakage increases

• Lower temperature

Refrigerant R-22 should not be mixed with:

• R-134a

• R-410A

• R-12

• Water

Leak testing is performed after:

• Vacuum testing

• Component installation

• Refrigerant charging

• Electrical repair