HVAC ELECTRICAL MAIN TEST Questions with Correct Solutions, Rated to Pass

current flow is? The flow of electrons in the circuit. Impedance is? Opposition to alternating currentflow. 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 material would be best suited for use as a semiconductor? Silicone The safety ground conductor is usually color coded Green and bare. An Electron has Has a negative charge Resistance is opposition to current flow How many Watts of power are used by a heater operating at 240 Volts and drawing 5 amps? 1200 watts Which of the following meters must use its internal power to check a load or circuit Ohmmeter In an electrical wiring, a black colored wire in an alternating current circuit usually indicates; the hot conductor Fuses are sized by: Volts & Amps what would be the result, if a 24 volts , 20-ohm low voltage contactor coil were wired in series with a 24 volt, 200-Ohm control relay coil? 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? 2880 Watts Which of the following is generally considered to be within the maximum allowable (plus or minus) supply voltage variation? 5% Capacitors are rated in? Microfarards & Volts When testing a capacitor with an analog or digital ohmmeter, the meter should; Measure low resistance then return to high reading What is a term used to describe the output side of a transformer? Secondary side One horsepower is equal to ________________ 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 18 ohms and a 9 ohms 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 Is True or False; Current flow will decrease when voltage increases True When resistors are wired in Parallel The voltage drop across each resistor Will depend on the value of each resistor Which of the following is equal to 2.1 KW 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 On an electronic oil safety switch what changes the pressure signal to electrical signal? Transducer The electric meter on a house measures the ______________ passing through it. Wattage A three phase load requires a minimum of; Three supply lines