HVAC Excellence - ELECTRICITY Exam Questions And Answers Rated 100% Correct!!

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? - AnswerOhmmeter In electrical wiring, a black colored wire in an alternating current circuit usually indicates; - Answerthe hot conductor. Fuses are sized by: - Answer-Volts & AmpsWhat 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 sourceWhich of the following is equal to 2.1KW? - Answer-2,100 Watts