ELECTRICITY Exam - HVAC Excellence – Questions and Answers 100% A+ Graded

ELECTRICITY Exam - HVAC Excellence – Questions and Answers 100% A+ Graded Current flow is: - CORRECT ANSWER-The flow of electrons in the circuit. Impedance is: - CORRECT ANSWER-Opposition to alternating current flow. Like charges; - CORRECT ANSWER-repel each other. Any material that will readily release electrons is called; - CORRECT ANSWER-A conductor The symbol for current is; - CORRECT ANSWER-I Which of the following materials would be best suited for use as a semi-conductor? - CORRECT ANSWER-silicon The safety ground conductor is usually color coded; - CORRECT ANSWER-green or bare. An electron has; - CORRECT ANSWER-a negative charge. Resistance is: - CORRECT ANSWER-Opposition to current flow. How many watts of power are used by a heater operating at 240 volts and drawing 5 amps? - CORRECT ANSWER-1200 watts Which of the following meters must use its internal power to check a load or circuit? - CORRECT ANSWER-Ohmmeter In electrical wiring, a black colored wire in an alternating current circuit usually indicates; - CORRECT ANSWER-the hot conductor. Fuses are sized by: - CORRECT 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? - CORRECT 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? - CORRECT ANSWER-2880 Watts Which of the following is generally considered to be within the maximum allowable (plus or minus) supply voltage variation? - CORRECT ANSWER-5% Capacitors are rated in - CORRECT ANSWER-Microfarads & Volts. When testing a capacitor with an analog or digital ohmmeter, the meter should; - CORRECT ANSWER-measure low resistance then return to high reading. What is the term used to describe the output side of a transformer? - CORRECT ANSWER-Secondary side. One horsepower is equal to __________ watts. - CORRECT ANSWER-746 How much resistance must be placed in a 120 volt circuit in order to limit the current to 2 amps? - CORRECT ANSWER-60 Ohms A parallel circuit contains a 18 ohm and a 9 ohm resistor. The total resistance equals; - CORRECT ANSWER-6 ohms. In a series circuit, the voltage drop across each resistance (load) will. - CORRECT ANSWER-add up to equal the source voltage. The total resistance of a parallel circuit will be; - CORRECT ANSWER-less than the smallest resistance. Which of the following statements about current is true? - CORRECT ANSWER-Current flow will increase when voltage increases. When resistors are wired in parallel; - CORRECT ANSWER-the voltage drop across each resistor will be the same as the applied source Which of the following is equal to 2.1KW? - CORRECT ANSWER-2,100 Watts