Electricity unit 6&7

A commercial air conditioning system that has two cooling capacities made possible by two compressors will likely be controlled by (a)   .

• Two thermostats

• A multistage thermostat

• A single-stage thermostat

• A line-voltage thermostat

An air conditioning system that uses a reversing valve to reverse the refrigeration cycle in order to provide heating is known as a (a)   .

• Heat pump

• Hot-gas-bypass system

• Hybrid heating system

• Reverse-cycle heating system

How are electrical components represented on schematic wiring diagrams?

• Actual pictures of the electrical components are shown on the schematic

• Symbols represent the electrical components within the schematic

• Descriptions of the components are printed on the schematic

• All of the choices are correct

On a schematic diagram for a residential packaged air conditioning unit, the coil for the compressor contactor will be shown in the (a)   section of the diagram.

• Low voltage
• Line voltage
• Primaryvoltage
• Indoorsection

5 The following electrical symbol represents a (a)   .

• Three-phase compressor

• Single-phase compressor

• Shaded-pole compressor

• Dual-phase compressor

6 The following electrical symbol represents a (a)   .

• Defrost heater

• Solenoid

• Crankcase heater

• Motor winding

7 The following electrical symbol represents a . Options: Relay coil, Circuit breaker, Fuse, Signal light. Answer: Circuit breaker.​ (a)  

• Fuse

• Signal light

• Relay coil
• Circuit breraker

8 The following electrical symbol represents a (a)   .

• Single-phase motor

• Transformer

• Two-pole solenoid

• Two-pole relay coil

9 The following electrical symbol represents

​ (a)  

• Float switch that opens on water level rise

• Thermostat that opens on temperature rise

• Pressure switch closes on rise in pressure
• Pressure switch that opens on rise in pressure

10 The following schematic diagram of a dehumidifier shows A(n) control system.​ (a)  

• Manual

• Hybrid

• Line voltage
• Low voltage