HVAC Electrical Test Questions with Complete Solutions Rated A+

Current flow is - the flow of electrons in the circuit impedance is - opposition to alternating current flow like charges - repel each other Any material that will readily release electrons is called - a conductor the symbol for current is - I Which of the following materials would best be suited for use as a semi-conductor - silicone the safety ground conductor is usually color coded - black (or bare or green & yellow stripe) An electron has - a negative charge resistance is - opposition to current flow How many watts of power are used by a heater operating at 460 volts and drawing 5 amps? - 2300 watts What type of meter uses its own battery? - ohmmeter in electrical wiring a black colored wire usually indicates - the hot conductor Fuses are sized by - Volts & Amps Two 120 volt incandescent light bulbs are wired in series, one is a 60 watt bulb, the other is a 4 watt bulb. The result would be; - Both bulbs light Three defrost heaters; each 15 ohms are wired in parallel to a 120 volt power supply. How many watts of power will be used? - 2880 watts What is generally considered to be the maximum allowable (plus or minus) supply voltage variation? - 5% Capacitors are rated in: - Microfarads & Volts When testing a capacitor with an analog ohmmeter, the needle on the meter should; - deflect towards zero then return to infinite reading. What is the term used to describe the output side of a transformer? - Secondary side One horsepower is equal to how many watts? - 746 Watts How much resistance must be placed in a 120 volt circuit in order to limit the current to 2 amps? - 60 ohms A parallel circuit contains a 18 ohm and 9 ohm resistor. The total resistance equals; - 6 ohms In a series circuit, the voltage drop across each resistance (load) will; - Add up to equal the source voltage The total resistance of a parallel circuit will be; - Less than the smallest resistance Which of the following statements about current is true? - Current flow will increase when voltage increases. When resistors are wired in parallel; - The voltage drop across each resistor will be the same as the applied source voltage. Which of the following is equal to 2.1KW? - 2,100 Watts Which of the following is equal to 100 milliamps? - 0.10 amperes A capacitor analyzer is designed to read; - the capacitance of a capacitor A 240 volt, 3 wire circuit can be split into two 120 volt circuits. - TRUE