TPC TRANSFORMERS AND AC CIRCUITS EXAM QUESTIONS AND ANSWERS ALREADY PASSED

TPC TRANSFORMERS AND AC CIRCUITS EXAM QUESTIONS AND ANSWERS ALREADY PASSED Heat and ____________ are the main problem areas in transformers. - Answers Dirt Transformer gauges indicate the correct oil level at a temperature of - Answers 25 Degrees Celsius You should periodically test the air above the liquid in a transformer for TCG, which stands for transformer - Answers Combustible Gas Inductance is represented in equations by the letter - Answers L XL = 2πfL is the equation for the ____________ reactance of a coil. - Answers Inductive Four inductors with values of 25 h, 5 h, 12 h, and 7 h are connected in series. What is the total inductance in the circuit? - Answers 49.0 h One farad is equal to 1 coulomb per volt. A coulomb is a unit of - Answers Electrical Charge Complete the following equation: 2π radians = - Answers 360 Degrees In a parallel RL ac circuit, the Pythagorean theorem can be used to calculate - Answers Impedance In an ac circuit, if XL and XC are equal, and EL and EC are equal, the circuit is said to be - Answers At Resonance Connecting capacitors in parallel _________ the total capacitance. - Answers Increases The unit of measurement of capacitance is the - Answers Farad Capacitor plates are usually made of - Answers Metal Foil When replacing defective capacitors, always try to replace them with capacitors having the same capacitance value and the same ____________ rating. - Answers Voltage When calculating power in an ac circuit, a negative value indicates energy in being transferred from the load to the source, something that happens only with ____________ loads. - Answers Reactive The rate at which energy is transferred from one object to another is called - Answers Power The effective power in a resistive circuit equals the RMS potential difference times the RMS - Answers Impedance Mechanical work is defined as the force exerted on an object multiplied by the - Answers Time it takes to move the object The current in an inductor is not important in calculating power because an inductor does NOT - Answers Contribute to Z The terminals of a transformer are marked H1, H2, etc. for the high-voltage side, and ____________, etc. for the low-voltage side. - Answers X1, X2 Power loss caused by the resistance of the windings in a transformer is called ________ loss. - Answers Copper An angle of __________ radians equals 360°. - Answers 6.28319 When adding liquid coolant to a transformer, you should use a hose made of - Answers Metal or Neoprene