Electricity for HVAC REVIEW Practice Test 3 True or False Correct 100%(RATED A+)

True - ANSWER Copper wire bend easily, has good mechanical strength, resists corrosion, and can be easily joined. True - ANSWER Aluminum is a good conductor of electricity, however, it has a tendency to corrode. False - ANSWER Voltage drop in a conductor is of least importance when sizing wire. False - ANSWER The maximum recommended voltage drop for a branch circuit is eight percent. False - ANSWER The allowable voltage drop of most manufacturers is 15% below the nameplate rating. True - ANSWER The type of insulation surrounding the conductor usually determines its application and the amperage it can be used for. True - ANSWER To calculate the voltage drop in a conductor, you must know the number of feet of wire that is used. True - ANSWER All heating, cooling, and refrigeration equipment should have some means for disconnecting the power supply at the equipment. False - ANSWER Magnetism can only be produced by the earth's core. False - ANSWER All magnets have three poles. True - ANSWER The permanent magnet is a piece of magnetic material that has been magnetized and can hold its magnetic strength for a reasonable length of time. True - ANSWER To make an electric motor move continuously, the magnetic field must rotate. False - ANSWER An alternating current of 60 hertz changes direction 100 times per second. False - ANSWER Motor speed is generally used to classify motors into different types. True - ANSWER Motors are selected mainly because of the starting torque required for the motor to perform its function. True - ANSWER The capacitor consists of two aluminum plates with an insulator between them. False - ANSWER The resistance-start-induction-run motor has only a starting winding. False - ANSWER An alternating current motor's speed is determined by the frequency of the power supply only. True - ANSWER Single-phase motors, with the exception of the permanent split-cap