In an AC resistive circuit:
A) Voltage leads current. B) The voltage and current are in phase.
C) Current leads voltage. D) Current lags voltage.
B
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When using the _______________ contactor across the line full voltage motor starting method, the electrical supply power to the motor is either full on, or completely off.
Fill in the blank(s) with the appropriate word(s).
Which of the following provides high voltage across the lamp’s electrodes at startup, causing them to emit electrons?
a. Instant-start ballast b. Preheat ballast c. Rapid-start ballast d. Late-start ballast
The proper time to water when using sprinklers is during the morning and late evening to avoid excessive waste through evaporation
Indicate whether the statement is true or false
Refrigeration oils must be miscible with the system refrigerant because:
A) The system depends on the oil to return the refrigerant to the compressor. B) The system depends on the refrigerant to return the oil to the compressor. C) The system depends on the refrigerant to carry the oil throughout the system to lubricate all the refrigeration components. D) The compressor cannot operate properly without liquid refrigerant in the crankcase.