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HVAC Electric Review 2 | Comprehensive
Q&A For Certification Success
Resistance is? - correct-answer -Opposition to current flow
An electron has? - correct-answer -A negative charge
Impedance is? - correct-answer -Opposition to alternating current flow
Current flow is? - correct-answer -Electron flow in a circuit
The safety ground conductor is usually color coded? - correct-answer -Green or
bare.
Like charges? - correct-answer -Repel each other
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The symbol for current is? - correct-answer -I
Any material that will readily release electrons is called? - correct-answer -A
conductor
Which of the following materials would be best suited for use as a semi-
conductor? - correct-answer -Silicon
How many watts of power are used by a heater operating at 240 volts and
drawing 5 amps? - correct-answer -1200 watts
Three defrost heaters, each 15 ohms are wired in parallel to a 120 volt power
supply. How
many watts of power will be used? - correct-answer -2880 Watts
What would be the result, if a 24 volt, 20-ohm low voltage contractor coil were
wired in series with a 24 volt, 200-0hm control relay coil? - correct-answer -Only
the control relay would operate.
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When the temperature of a positive temperature coefficient (PTC) thermistor
increases, its resistance will? - correct-answer -Increase.
When the temperature of a negative temperature coefficient (NTC) thermistor
increases, its resistance will? - correct-answer -Decrease
To discharge a capacitor prior to ohmmeter testing? - correct-answer -Use a
15,000 or 20,000 ohm, 2 to 5 watt resistor across the terminals
Which of the following is an acceptable temporary replacement for a run
capacitor rated at 35MFD@440VAC? - correct-answer -37.5MFD @ 440VAC.
The synchronous speed of a four pole, 60 Hz single phase motor is? - correct-
answer -1800 rpm
Heating Thermostat - correct-answer -
Cooling Thermostat - correct-answer -
HVAC Electric Review 2 | Comprehensive
Q&A For Certification Success
Resistance is? - correct-answer -Opposition to current flow
An electron has? - correct-answer -A negative charge
Impedance is? - correct-answer -Opposition to alternating current flow
Current flow is? - correct-answer -Electron flow in a circuit
The safety ground conductor is usually color coded? - correct-answer -Green or
bare.
Like charges? - correct-answer -Repel each other
,2|Page
The symbol for current is? - correct-answer -I
Any material that will readily release electrons is called? - correct-answer -A
conductor
Which of the following materials would be best suited for use as a semi-
conductor? - correct-answer -Silicon
How many watts of power are used by a heater operating at 240 volts and
drawing 5 amps? - correct-answer -1200 watts
Three defrost heaters, each 15 ohms are wired in parallel to a 120 volt power
supply. How
many watts of power will be used? - correct-answer -2880 Watts
What would be the result, if a 24 volt, 20-ohm low voltage contractor coil were
wired in series with a 24 volt, 200-0hm control relay coil? - correct-answer -Only
the control relay would operate.
, 3|Page
When the temperature of a positive temperature coefficient (PTC) thermistor
increases, its resistance will? - correct-answer -Increase.
When the temperature of a negative temperature coefficient (NTC) thermistor
increases, its resistance will? - correct-answer -Decrease
To discharge a capacitor prior to ohmmeter testing? - correct-answer -Use a
15,000 or 20,000 ohm, 2 to 5 watt resistor across the terminals
Which of the following is an acceptable temporary replacement for a run
capacitor rated at 35MFD@440VAC? - correct-answer -37.5MFD @ 440VAC.
The synchronous speed of a four pole, 60 Hz single phase motor is? - correct-
answer -1800 rpm
Heating Thermostat - correct-answer -
Cooling Thermostat - correct-answer -
