Extra Exam - E5D
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- B
- E5D13 How many watts are consumed in a circuit having a power factor of 0.2 if the input is 100-V AC at 4 amperes? / A. 400 watts / B. 80 watts / C. 2000 watts / D. 50 watts
- A
- E5D15 What is reactive power? / A. Wattless, nonproductive power / B. Power consumed in wire resistance in an inductor / C. Power lost because of capacitor leakage / D. Power consumed in circuit Q
- B
- E5D14 How much power is consumed in a circuit consisting of a 100 ohm resistor in series with a 100 ohm inductive reactance drawing 1 ampere? / A. 70.7 Watts / B. 100 Watts / C. 141.4 Watts / D. 200 Watts
- D
- E5D18 How many watts are consumed in a circuit having a power factor of 0.6 if the input is 200V AC at 5 amperes? / A. 200 watts / B. 1000 watts / C. 1600 watts / D. 600 watts
- B
- E5D19 How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500 watts? / A. 704 W / B. 355 W / C. 252 W / D. 1.42 mW
- C
- E5D03 What device is used to store electrical energy in an electrostatic field? / A. A battery / B. A transformer / C. A capacitor / D. An inductor
- B
- E5D05 What is a magnetic field? / A. Electric current through the space around a permanent magnet / B. The region surrounding a magnet through which a magnetic force acts / C. The space between the plates of a charged capacitor, through which a magnetic force acts / D. The force that drives current through a resistor
- B
- E5D10 In a circuit that has both inductors and capacitors, what happens to reactive power? / A. It is dissipated as heat in the circuit / B. It is repeatedly exchanged between the associated magnetic and electric fields, but is not dissipated / C. It is dissipated as kinetic energy in the circuit / D. It is dissipated in the formation of inductive and capacitive fields
- D
- E5D07 What determines the strength of a magnetic field around a conductor? / A. The resistance divided by the current / B. The ratio of the current to the resistance / C. The diameter of the conductor / D. The amount of current
- B
- E5D04 What unit measures electrical energy stored in an electrostatic field? / A. Coulomb / B. Joule / C. Watt / D. Volt
- D
- E5D16 What is the power factor of an RL circuit having a 45 degree phase angle between the voltage and the current? / A. 0.866 / B. 1.0 / C. 0.5 / D. 0.707
- B
- E5D08 What is the term for energy that is stored in an electromagnetic or electrostatic field? / A. Amperes-joules / B. Potential energy / C. Joules-coulombs / D. Kinetic energy
- D
- E5D06 In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow? / A. In the same direction as the current / B. In a direction opposite to the current / C. In all directions; omnidirectional / D. In a direction determined by the left-hand rule
- A
- E5D01 What is the result of skin effect? / A. As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface / B. As frequency decreases, RF current flows in a thinner layer of the conductor, closer to the surface / C. Thermal effects on the surface of the conductor increase the impedance / D. Thermal effects on the surface of the conductor decrease the impedance
- C
- E5D12 What is the power factor of an R-L circuit having a 60 degree phase angle between the voltage and the current? / A. 1.414 / B. 0.866 / C. 0.5 / D. 1.73
- C
- E5D17 What is the power factor of an RL circuit having a 30 degree phase angle between the voltage and the current? / A. 1.73 / B. 0.5 / C. 0.866 / D. 0.577
- A
- E5D11 How can the true power be determined in an AC circuit where the voltage and current are out of phase? / A. By multiplying the apparent power times the power factor / B. By dividing the reactive power by the power factor / C. By dividing the apparent power by the power factor / D. By multiplying the reactive power times the power factor
- D
- E5D09 What is the term for an out-of-phase, nonproductive power associated with inductors and capacitors? / A. Effective power / B. True power / C. Peak envelope power / D. Reactive power
- C
- E5D02 Why is the resistance of a conductor different for RF currents than for direct currents? / A. Because the insulation conducts current at high frequencies / B. Because of the Heisenburg Effect / C. Because of skin effect / D. Because conductors are non-linear devices