IDA-101 End of unit 18

What is the most common switch used in air-conditioning control systems?

• pressure

• thermostat

• push button

• humidistat

The _______ is the most important load in a refrigeration system.

• compressor

• evaporator

• condenser

• expansion valve

Why is it important for a service technician to be able to use volt-ohm meters?

• To measure electrical resistance and voltage accurately

• To perform mechanical repairs

• To enhance communication skills

• To improve customer service

A pictorial or a component arrangement diagram shows .

• the components in a circuit-by-circuit arrangement

• the installation connections only

• the control panel layout
• all of the choices are correct

Which of the following could be problems if the compressor will not start?

• blown fuse

• contactor

• thermostat

• all of the problems could keep the compressor from starting

Which of the following could be the problem if the compressor will not run but the condenser fan motor will operate?

• bad run capacitor

• bad condenser fan motor capacitor

• bad contactor

• none of the choices are correct

What would be the remedy for the problem of a bad run capacitor?

• replace compressor

• replace condenser fan motor

• replace condensing unit

• replace compressor running capacitor

Which of the following could be the cause of the compressor cycling on overload on heating? Use figure 18.7

• bad contactor coil

• defective outdoor thermostat

• damaged reversing valve

• none of the choices are correct

Which of the following could be a reason for the compressor not to run? Use figure 18.7

• loose electrical connections

• compressor internal overload open

• locked-down compressor

• all of the reasons could prevent the compressor from operating

What could be the problem if the pilot does not stop when the pilot lights? Use figure 18.8

• pilot not covering electrode

• thermostat not calling for heat