HVAC Electrical Test Questions and Answers Rated A+

HVAC Electrical Test Questions and Answers 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 The electric meter on a house measures the _______ passing through it. wattage A three phase load requires a minimum of; three supply lines Which of the following is the correct formula for determining wattage in an electrical circuit? W = E times I (or V x I) A parallel circuit consists of three resistors R1=30 ohms R2=15 ohms R3=10ohms if the current through R2=4 amperes, what is