HVAC Air Conditioning 2

Question 1

What is the primary purpose of a metering device in an air conditioning system?

Accepted Answer

Reduce refrigerant pressure and control flow into the evaporator

Answer

Increase refrigerant pressure

Answer

Remove moisture from refrigerant

Answer

Filter contaminants from refrigerant

Question 2

A system is operating with high suction pressure and high discharge pressure. Which condition does this most likely indicate?

Accepted Answer

Overcharge of refrigerant

Answer

Low refrigerant charge

Answer

Restricted liquid line

Answer

Faulty metering device stuck closed

Question 3

What does EER stand for in air conditioning ratings?

Accepted Answer

Energy Efficiency Ratio

Answer

Energy Efficiency Rating

Answer

Electrical Energy Requirement

Answer

Equipment Efficiency Ratio

Question 4

In a split-system air conditioner, which component is located in the outdoor unit?

Accepted Answer

Condenser coil and compressor

Answer

Evaporator coil

Answer

Blower motor

Answer

Metering device only

Question 5

What is subcooling in an air conditioning system?

Accepted Answer

Lowering refrigerant below its saturation temperature in the liquid state

Answer

Cooling the evaporator below its design temperature

Answer

Removing superheat from suction gas

Answer

Operating the system below outdoor design conditions

Question 6

Which type of compressor uses scrolls (spiral-shaped wraps) to compress refrigerant?

Accepted Answer

Scroll compressor

Answer

Reciprocating compressor

Answer

Rotary compressor

Answer

Centrifugal compressor

Question 7

When checking a system for non-condensables, where would they accumulate in the refrigeration circuit?

Accepted Answer

Top of the condenser / receiver

Answer

Evaporator inlet

Answer

Suction line

Answer

Liquid line filter-drier