What is the primary purpose of defrosting methods in refrigeration systems?

• To increase compressor efficiency

• To prevent ice build-up on evaporators

• To enhance thermal conductivity

• To reduce air flow

Which defrost method uses the heat in the air of the refrigerated space?

• Natural Defrost

• Hot Gas Defrost

• Electric Defrost

• Reverse Cycle Defrost

What is the function of a defrost time clock?

• To monitor evaporator temperature

• To control compressor speed

• To measure suction pressure

• To initiate and terminate defrost cycles

Which defrost method is specifically used in low temperature refrigeration systems?

• Washes

• Natural Defrost

• Supplementary Heat Defrost

• Timed Off-Cycle Defrost

What does the defrost termination thermostat do?

• Controls the compressor operation

• Monitors evaporator pressure

• Initiates the defrost cycle

• Stops the defrost cycle when frost is cleared

In a hot gas defrost system, what is the primary source of heat used for defrosting?

• Liquid refrigerant

• Electric heaters

• Ambient air

• High pressure, high temperature compressor discharge vapor

What is the main drawback of using a hot gas defrost system?

• Requires constant power supply

• Risk of liquid flooding back to the compressor

• Inefficient heat transfer

• Limited to single evaporator systems

Which component prevents refrigerant from flowing in the wrong direction?

• Defrost termination thermostat

• Suction line accumulator

• Check valve

• Reversing valve

What is the purpose of a suction line accumulator?

• To control defrost cycles

• To prevent liquid refrigerant from entering the compressor

• To increase refrigerant pressure

• To enhance cooling efficiency

Which defrost method is typically used in ice machines?

• Natural Defrost

• Reverse Cycle Defrost

• Electric Defrost

• Washes