Cap it off!
A capacitor is rated in
Microfarads
The first main safety concern when troubleshooting a no-heat call on an oil furnace is to
Check the combustion chamber for liquid oil present
An electric motor is an __________ load.
Inductive
The oil-pressure safety switch is operated by
The difference between crankcase pressure and oil pressure
The temperature-rise method for determining airflow is; (formula)
CFM = BTU / (1.08 × ΔT)
An AC motor is used to
Convert electrical energy to mechanical energy
What is the control-transformer input voltage for a residential split system?
120 Volts
A faulty condenser-fan motor on an air-conditioning system will cause these symptoms:
High suction pressure and high discharge pressure
A scroll compressor moves refrigerant by means of;
Involute spirals
Zero psia (pounds per square inch absolute) is:
Approximately 14.7 psig at sea level
What is the minimum voltage that can be used on a 120-volt motor?
108 volts
What do the horizontal lines represent in an electrical schematic diagram?
The individual circuits in the electrical system
The state of the refrigerant entering the condenser is;
High-pressure/highly superheated vapor
An inefficient compressor is usually indicated by ________ head pressure and ________ suction pressure.
Low, High
The symbol used for electrical pressure is
E
On a single-phase compressor, where would the highest resistance be found?
Run to Start
The bottom portion of an electrical schematic is commonly
Control Voltage Circuit
After a system has been opened and the compressor changed, the service technician must;
Replace the filter drier, leak check, evacuate, and charge
A technician has found an air-conditioning system with a leak in the liquid line. After the line is repaired, the system is evacuated and properly recharged. When the system is started, the compressor is noisy and running hot. The most probable cause of the noise is;
Low oil
Electron flow is measured in
Amps
When testing for voltage across a switch located in a 120-volt circuit, what reading would be obtained if the switch were in the closed position?
0 Volts
The light dashed lines on an installation diagram show
The low-voltage field wiring
All electrical installations and repairs must meet
NEC Guidelines
The R-134a high-pressure gauge reads 146 psig and the liquid-line temperature at the condensing unit is 95 °F. What is the operating system subcooling?
15 °F
The symbol used for electron flow is
I