HVAC Excellence - ELECTRICITY Exam
Questions And Answers
/. Current flow is: - Answer-The flow of electrons in the circuit.
/.Impedance is: - Answer-Opposition to alternating current flow.
/.Like charges; - Answer-repel each other.
/.Any material that will readily release electrons is called; - Answer-A conductor
/.The symbol for current is; - Answer-I
/.Which of the following materials would be best suited for use as a semi-conductor? -
Answer-silicon
/.The safety ground conductor is usually color coded; - Answer-green or bare.
/.An electron has; - Answer-a negative charge.
/.Resistance is: - Answer-Opposition to current flow.
/.How many watts of power are used by a heater operating at 240 volts and drawing 5
amps? - Answer-1200 watts
/.Which of the following meters must use its internal power to check a load or circuit? -
Answer-Ohmmeter
/.In electrical wiring, a black colored wire in an alternating current circuit usually
indicates; - Answer-the hot conductor.
/.Fuses are sized by: - Answer-Volts & Amps
/.What would be the result, if a 24 volt, 20-ohm low voltage conta ctor coil were wired in
series with a 24 volt, 200-ohm control relay coil? - Answer-Only the control relay would
operate.
/.Three defrost heaters, each 15 ohms are wired in parallel to a 120 volt power supply.
How many watts of power will be used? - Answer-2880 Watts
/.Which of the following is generally considered to be within the maximum allowable
(plus or minus) supply voltage variation? - Answer-5%
, /.Capacitors are rated in - Answer-Microfarads & Volts.
/.When testing a capacitor with an analog or digital ohmmeter, the meter should; -
Answer-measure low resistance then return to high reading.
/.What is the term used to describe the output side of a transformer? - Answer-
Secondary side.
/.One horsepower is equal to __________ watts. - Answer-746
/.How much resistance must be placed in a 120 volt circuit in order to limit the current to
2 amps? - Answer-60 Ohms
/.A parallel circuit contains a 18 ohm and a 9 ohm resistor. The total resistance equals; -
Answer-6 ohms.
/.In a series circuit, the voltage drop across each resistance (load) will. - Answer-add up
to equal the source voltage.
/.The total resistance of a parallel circuit will be; - Answer-less than the smallest
resistance.
/.Which of the following statements about current is true? - Answer-Current flow will
increase when voltage increases.
/.When resistors are wired in parallel; - Answer-the voltage drop across each resistor
will be the same as the applied source
/.Which of the following is equal to 2.1KW? - Answer-2,100 Watts
/.Which of the following is equal to 100 milliamps? - Answer-0.10 amperes
/.A capacitor analyzer is designed to read; - Answer-the capacitive resistance of a
capacitor.
/.On an electronic oil safety switch what changes the pressure singal to electrical
signal? - Answer-Transducer.
/.The electric meter on a house measures the ______________ passing th rough it. -
Answer-wattage
/.A three phase load requires a minimum of; - Answer-three supply lines.
/.Which of the following is the correct formula for determining wattage in an electrical
circuit? - Answer-W = E times I
Questions And Answers
/. Current flow is: - Answer-The flow of electrons in the circuit.
/.Impedance is: - Answer-Opposition to alternating current flow.
/.Like charges; - Answer-repel each other.
/.Any material that will readily release electrons is called; - Answer-A conductor
/.The symbol for current is; - Answer-I
/.Which of the following materials would be best suited for use as a semi-conductor? -
Answer-silicon
/.The safety ground conductor is usually color coded; - Answer-green or bare.
/.An electron has; - Answer-a negative charge.
/.Resistance is: - Answer-Opposition to current flow.
/.How many watts of power are used by a heater operating at 240 volts and drawing 5
amps? - Answer-1200 watts
/.Which of the following meters must use its internal power to check a load or circuit? -
Answer-Ohmmeter
/.In electrical wiring, a black colored wire in an alternating current circuit usually
indicates; - Answer-the hot conductor.
/.Fuses are sized by: - Answer-Volts & Amps
/.What would be the result, if a 24 volt, 20-ohm low voltage conta ctor coil were wired in
series with a 24 volt, 200-ohm control relay coil? - Answer-Only the control relay would
operate.
/.Three defrost heaters, each 15 ohms are wired in parallel to a 120 volt power supply.
How many watts of power will be used? - Answer-2880 Watts
/.Which of the following is generally considered to be within the maximum allowable
(plus or minus) supply voltage variation? - Answer-5%
, /.Capacitors are rated in - Answer-Microfarads & Volts.
/.When testing a capacitor with an analog or digital ohmmeter, the meter should; -
Answer-measure low resistance then return to high reading.
/.What is the term used to describe the output side of a transformer? - Answer-
Secondary side.
/.One horsepower is equal to __________ watts. - Answer-746
/.How much resistance must be placed in a 120 volt circuit in order to limit the current to
2 amps? - Answer-60 Ohms
/.A parallel circuit contains a 18 ohm and a 9 ohm resistor. The total resistance equals; -
Answer-6 ohms.
/.In a series circuit, the voltage drop across each resistance (load) will. - Answer-add up
to equal the source voltage.
/.The total resistance of a parallel circuit will be; - Answer-less than the smallest
resistance.
/.Which of the following statements about current is true? - Answer-Current flow will
increase when voltage increases.
/.When resistors are wired in parallel; - Answer-the voltage drop across each resistor
will be the same as the applied source
/.Which of the following is equal to 2.1KW? - Answer-2,100 Watts
/.Which of the following is equal to 100 milliamps? - Answer-0.10 amperes
/.A capacitor analyzer is designed to read; - Answer-the capacitive resistance of a
capacitor.
/.On an electronic oil safety switch what changes the pressure singal to electrical
signal? - Answer-Transducer.
/.The electric meter on a house measures the ______________ passing th rough it. -
Answer-wattage
/.A three phase load requires a minimum of; - Answer-three supply lines.
/.Which of the following is the correct formula for determining wattage in an electrical
circuit? - Answer-W = E times I
