In what unit are the cooling capacity measured in refrigeration systems?

• kJ

• kW

• kJ/kg

• kW.h

Which refrigerant is used most frequently in large industrial plants?

• Ammonia

• Sulfur Dioxide

• Calcium Chloride

• Carbon Dioxide

What does HVAC stand for?

• Handling, Ventilation, Air Conditioning

• Heating, Ventilation, Air conditioning

• Heating, Ventilation, Alternating current

• Household, Ventilation, Air conditioning

What is not undesirable effect on the refrigeration system of the air purging?

• Pressure in the system rises

• Operating current rises

• Cooling efficiency rises

• Water may lead to corrosion of parts in the refrigeration system

In the room air conditioner installation manual, what is the pipe size?

• The diameter of the copper pipe

• The length of the copper pipe

• The thickness of the copper pipe

• None of these

Both temperature and ___________ affect the comfort of the human body.

• Atmosphere

• Altitude

• Attitude

• Humidity

What is the unit of power?

• Resistance    

• Amperage

• Voltage        

• Wattage

Which of the following is not a primary function of an HVAC system?

• Heating

• Cooling

• Lighting

• Ventilation

What is the purpose of an air filter in an HVAC system?

• To regulate temperature

• To remove dust and particles from the air

• To generate airflow

• To control humidity levels

What safety precautions should be taken when working with ammonia refrigeration systems?

• Use of personal protective equipment (PPE)

• Regular maintenance and inspections

• Proper ventilation in the equipment room

• All of these