E

1.04 UTF-8 J E 0 0 1243588 E5A01 What can cause the voltage across reactances in series to be larger than the voltage applied to them? 0 Resonance 1 Capacitance 0 Conductance 0 Resistance 0 E5A02 What is resonance in an electrical circuit? 0 The highest frequency that will pass current 0 The lowest frequency that will pass current 0 The frequency at which capacitive reactance equals inductive reactance 1 The frequency at which power factor is at a minimum 0 E5A03 What are the conditions for resonance to occur in an electrical circuit? 0 The power factor is at a minimum 0 Inductive and capacitive reactances are equal 1 The square root of the sum of the capacitive and inductive reactance is equal to the resonant frequency 0 The square root of the product of the capacitive and inductive reactance is equal to the resonant frequency 0 E5A04 When the inductive reactance of an electrical circuit equals its capacitive reactance, what is this condition called? 0 Reactive quiescence 0 High Q 0 Reactive equilibrium 0 Resonance 1 E5A05 What is the magnitude of the impedance of a series R-L-C circuit at resonance? 0 High, as compared to the circuit resistance 0 Approximately equal to capacitive reactance 0 Approximately equal to inductive reactance 0 Approximately equal to circuit resistance 1 E5A06 What is the magnitude of the impedance of a circuit with a resistor, an inductor and a capacitor all in parallel, at resonance? 0 Approximately equal to circuit resistance 1 Approximately equal to inductive reactance 0 Low, as compared to the circuit resistance 0 Approximately equal to capacitive reactance 0 E5A07 What is the magnitude of the current at the input of a series R-L-C circuit at resonance? 0 It is at a minimum 0 It is at a maximum 1 It is DC 0 It is zero 0 E5A08 What is the magnitude of the circulating current within the components of a parallel L-C circuit at resonance? 0 It is at a minimum 0 It is at a maximum 1 It is DC 0 It is zero 0 E5A09 What is the magnitude of the current at the input of a parallel R-L-C circuit at resonance? 0 It is at a minimum 1 It is at a maximum 0 It is DC 0 It is zero 0 E5A10 What is the relationship between the current through a resonant circuit and the voltage across the circuit? 0 The voltage leads the current by 90 degrees 0 The current leads the voltage by 90 degrees 0 The voltage and current are in phase 1 The voltage and current are 180 degrees out of phase 0 E5A11 What is the relationship between the current into (or out of) a parallel resonant circuit and the voltage across the circuit? 0 The voltage leads the current by 90 degrees 0 The current leads the voltage by 90 degrees 0 The voltage and current are in phase 1 The voltage and current are 180 degrees out of phase 0 E5A12 What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 1.8 MHz and a Q of 95? 0 18.9 kHz 1 1.89 kHz 0 189 Hz 0 58.7 kHz 0 E5A13 What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 7.1 MHz and a Q of 150? 0 211 kHz 0 16.5 kHz 0 47.3 kHz 1 21.1 kHz 0 E5A14 What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 14.25 MHz and a Q of 150? 0 95 kHz 1 10.5 kHz 0 10.5 MHz 0 17 kHz 0 E5A15 What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 21.15 MHz and a Q of 95? 0 4.49 kHz 0 44.9 kHz 0 22.3 kHz 0 222.6 kHz 1 E5A16 What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 3.7 MHz and a Q of 118? 0 22.3 kHz 0 76.2 kHz 0 31.4 kHz 1 10.8 kHz 0 E5A17 What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 14.25 MHz and a Q of 187? 0 22.3 kHz 0 10.8 kHz 0 76.2 kHz 1 13.1 kHz 0 E5A18 What is the resonant frequency of a series RLC circuit if R is 47 ohms, L is 50 microhenrys and C is 40 picofarads? 0 79.6 MHz 0 1.78 MHz 0 3.56 MHz 1 7.96 MHz 0 E5A19 What is the resonant frequency of a series RLC circuit if R is 47 ohms, L is 40 microhenrys and C is 200 picofarads? 0 1.99 kHz 0 1.78 MHz 1 1.99 MHz 0 1.78 kHz 0 E5A20 What is the resonant frequency of a series RLC circuit if R is 47 ohms, L is 50 microhenrys and C is 10 picofarads? 0 3.18 MHz 0 3.18 kHz 0 7.12 kHz 0 7.12 MHz 1 E5A21 What is the resonant frequency of a series RLC circuit if R is 47 ohms, L is 25 microhenrys and C is 10 picofarads? 0 10.1 MHz 1 63.7 MHz 0 10.1 kHz 0 63.7 kHz 0 E5A22 What is the resonant frequency of a series RLC circuit if R is 47 ohms, L is 3 microhenrys and C is 40 picofarads? 0 13.1 MHz 0 14.5 MHz 1 14.5 kHz 0 13.1 kHz 0 E5A23 What is the resonant frequency of a series RLC circuit if R is 47 ohms, L is 4 microhenrys and C is 20 picofarads? 0 19.9 kHz 0 17.8 kHz 0 19.9 MHz 0 17.8 MHz 1 E5A24 What is the resonant frequency of a series RLC circuit if R is 47 ohms, L is 8 microhenrys and C is 7 picofarads? 0 2.84 MHz 0 28.4 MHz 0 21.3 MHz 1 2.13 MHz 0 E5A25 What is the resonant frequency of a series RLC circuit if R is 47 ohms, L is 3 microhenrys and C is 15 picofarads? 0 23.7 MHz 1 23.7 kHz 0 35.4 kHz 0 35.4 MHz 0 E5B01 What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the supply voltage? 0 An exponential rate of one 0 One time constant 1 One exponential period 0 A time factor of one 0 E5B02 What is the term for the time required for the current in an RL circuit to build up to 63.2% of the maximum value? 0 One time constant 1 An exponential period of one 0 A time factor of one 0 One exponential rate 0 E5B03 What is the term for the time it takes for a charged capacitor in an RC circuit to discharge to 36.8% of its initial value of stored charge? 0 One discharge period 0 An exponential discharge rate of one 0 A discharge factor of one 0 One time constant 1 E5B04 The capacitor in an RC circuit is charged to what percentage of the supply voltage after two time constants? 0 36.8% 0 63.2% 0 86.5% 1 95% 0 E5B05 The capacitor in an RC circuit is discharged to what percentage of the starting voltage after two time constants? 0 86.5% 0 63.2% 0 36.8% 0 13.5% 1 E5B06 What is the time constant of a circuit having two 100-microfarad capacitors and two 470-kilohm resistors all in series? 0 47 seconds 1 101.1 seconds 0 103 seconds 0 220 seconds 0 E5B07 What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors all in parallel? 0 47 seconds 0 101.1 seconds 0 103 seconds 0 220 seconds 1 E5B08 What is the time constant of a circuit having a 220-microfarad capacitor in series with a 470-kilohm resistor? 0 47 seconds 0 80 seconds 0 103 seconds 1 220 seconds 0 E5B09 How long does it take for an initial charge of 20 V DC to decrease to 7.36 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it? 0 0.02 seconds 1 0.08 seconds 0 450 seconds 0 1350 seconds 0 E5B10 How long does it take for an initial charge of 20 V DC to decrease to 0.37 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it? 0 0.02 seconds 0 0.08 seconds 1 450 seconds 0 1350 seconds 0 E5B11 How long does it take for an initial charge of 800 V DC to decrease to 294 V DC in a 450-microfarad capacitor when a 1-megohm resistor is connected across it? 0 0.02 seconds 0 0.08 seconds 0 450 seconds 1 1350 seconds 0 E5C01 What type of graph can be used to calculate impedance along transmission lines? 0 A Smith chart 1 A logarithmic chart 0 A Jones chart 0 A radiation pattern chart 0 E5C02 What type of coordinate system is used in a Smith chart? 0 Voltage circles and current arcs 0 Resistance circles and reactance arcs 1 Voltage lines and current chords 0 Resistance lines and reactance chords 0 E5C03 What type of calculations can be performed using a Smith chart? 0 Beam headings and radiation patterns 0 Satellite azimuth and elevation bearings 0 Impedance and SWR values in transmission lines 1 Circuit gain calculations 0 E5C04 What are the two families of circles that make up a Smith chart? 0 Resistance and voltage 0 Reactance and voltage 0 Resistance and reactance 1 Voltage and impedance 0 E5C05 What type of chart is shown in Figure E5-1? 0 Smith chart 1 Free-space radiation directivity chart 0 Vertical-space radiation pattern chart 0 Horizontal-space radiation pattern chart 0 E5C06 On the Smith chart shown in Figure E5-1, what is the name for the large outer circle bounding the coordinate portion of the chart? 0 Prime axis 0 Reactance axis 1 Impedance axis 0 Polar axis 0 E5C07 On the Smith chart shown in Figure E5-1, what is the only straight line shown? 0 The reactance axis 0 The current axis 0 The voltage axis 0 The resistance axis 1 E5C08 What is the process of normalizing with regard to a Smith chart? 0 Reassigning resistance values with regard to the reactance axis 0 Reassigning reactance values with regard to the resistance axis 0 Reassigning impedance values with regard to the prime center 1 Reassigning prime center with regard to the reactance axis 0 E5C09 What is the third family of circles, which are added to a Smith chart during the process of solving problems? 0 Standing-wave ratio circles 1 Antenna-length circles 0 Coaxial-length circles 0 Radiation-pattern circles 0 E5C10 In rectangular coordinates, what is the impedance of a network comprised of a 10-microhenry inductor in series with a 40-ohm resistor at 500 MHz? 0 40 + j31,400 1 40 - j31,400 0 31,400 + j40 0 31,400 - j40 0 E5C11 In polar coordinates, what is the impedance of a network comprised of a 100-picofarad capacitor in parallel with a 4,000-ohm resistor at 500 kHz? 0 2490 ohms, /__51.5_degrees__ 0 4000 ohms, /__38.5_degrees__ 0 2490 ohms, /__-51.5_degrees__ 1 5112 ohms, /__-38.5_degrees__ 0 E5C13 What are the curved lines on a Smith chart? 0 Portions of current circles 0 Portions of voltage circles 0 Portions of resistance circles 0 Portions of reactance circles 1 E5C14 How are the wavelength scales on a Smith chart calibrated? 0 In portions of transmission line electrical frequency 0 In portions of transmission line electrical wavelength 1 In portions of antenna electrical wavelength 0 In portions of antenna electrical frequency 0 E5D01 What is the phase angle between the voltage across and the current through a series R-L-C circuit if XC is 25 ohms, R is 100 ohms, and XL is 100 ohms? 0 36.9 degrees with the voltage leading the current 1 53.1 degrees with the voltage lagging the current 0 36.9 degrees with the voltage lagging the current 0 53.1 degrees with the voltage leading the current 0 E5D02 What is the phase angle between the voltage across and the current through a series R-L-C circuit if XC is 500 ohms, R is 1 kilohm, and XL is 250 ohms? 0 68.2 degrees with the voltage leading the current 0 14.0 degrees with the voltage leading the current 0 14.0 degrees with the voltage lagging the current 1 68.2 degrees with the voltage lagging the current 0 E5D03 What is the phase angle between the voltage across and the current through a series R-L-C circuit if XC is 50 ohms, R is 100 ohms, and XL is 25 ohms? 0 76 degrees with the voltage lagging the current 0 14 degrees with the voltage leading the current 0 76 degrees with the voltage leading the current 0 14 degrees with the voltage lagging the current 1 E5D04 What is the phase angle between the voltage across and the current through a series R-L-C circuit if XC is 100 ohms, R is 100 ohms, and XL is 75 ohms? 0 14 degrees with the voltage lagging the current 1 14 degrees with the voltage leading the current 0 76 degrees with the voltage leading the current 0 76 degrees with the voltage lagging the current 0 E5D05 What is the phase angle between the voltage across and the current through a series R-L-C circuit if XC is 50 ohms, R is 100 ohms, and XL is 75 ohms? 0 76 degrees with the voltage leading the current 0 76 degrees with the voltage lagging the current 0 14 degrees with the voltage lagging the current 0 14 degrees with the voltage leading the current 1 E5D06 What is the relationship between the current through and the voltage across a capacitor? 0 Voltage and current are in phase 0 Voltage and current are 180 degrees out of phase 0 Voltage leads current by 90 degrees 0 Current leads voltage by 90 degrees 1 E5D07 What is the relationship between the current through an inductor and the voltage across an inductor? 0 Voltage leads current by 90 degrees 1 Current leads voltage by 90 degrees 0 Voltage and current are 180 degrees out of phase 0 Voltage and current are in phase 0 E5D08 What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms? 0 14 degrees with the voltage lagging the current 0 14 degrees with the voltage leading the current 1 76 degrees with the voltage lagging the current 0 76 degrees with the voltage leading the current 0 E5D09 What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 75 ohms, R is 100 ohms, and XL is 100 ohms? 0 76 degrees with the voltage leading the current 0 14 degrees with the voltage leading the current 1 14 degrees with the voltage lagging the current 0 76 degrees with the voltage lagging the current 0 E5D10 What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 75 ohms, R is 100 ohms, and XL is 50 ohms? 0 76 degrees with the voltage lagging the current 0 14 degrees with the voltage leading the current 0 14 degrees with the voltage lagging the current 1 76 degrees with the voltage leading the current 0 E5D11 What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 250 ohms, R is 1 kilohm, and XL is 500 ohms? 0 81.47 degrees with the voltage lagging the current 0 81.47 degrees with the voltage leading the current 0 14.04 degrees with the voltage lagging the current 0 14.04 degrees with the voltage leading the current 1 E5E01 In polar coordinates, what is the impedance of a network comprised of a 100-ohm-reactance inductor in series with a 100-ohm resistor? 0 121 ohms, /__35_degrees__ 0 141 ohms, /__45_degrees__ 1 161 ohms, /__55_degrees__ 0 181 ohms, /__65_degrees__ 0 E5E02 In polar coordinates, what is the impedance of a network comprised of a 100-ohm-reactance inductor, a 100-ohm-reactance capacitor, and a 100-ohm resistor all connected in series? 0 100 ohms, /__90_degrees__ 0 10 ohms, /__0_degrees__ 0 10 ohms, /__100_degrees__ 0 100 ohms, /__0_degrees__ 1 E5E03 In polar coordinates, what is the impedance of a network comprised of a 300-ohm-reactance capacitor, a 600-ohm-reactance inductor, and a 400-ohm resistor, all connected in series? 0 500 ohms, /__37_degrees__ 1 400 ohms, /__27_degrees__ 0 300 ohms, /__17_degrees__ 0 200 ohms, /__10_degrees__ 0 E5E04 In polar coordinates, what is the impedance of a network comprised of a 400-ohm-reactance capacitor in series with a 300-ohm resistor? 0 240 ohms, /__36.9_degrees__ 0 240 ohms, /__-36.9_degrees__ 0 500 ohms, /__53.1_degrees__ 0 500 ohms, /__-53.1_degrees__ 1 E5E05 In polar coordinates, what is the impedance of a network comprised of a 400-ohm-reactance inductor in parallel with a 300-ohm resistor? 0 240 ohms, /__36.9_degrees__ 1 240 ohms, /__-36.9_degrees__ 0 500 ohms, /__53.1_degrees__ 0 500 ohms, /__-53.1_degrees__ 0 E5E06 In polar coordinates, what is the impedance of a network comprised of a 100-ohm-reactance capacitor in series with a 100-ohm resistor? 0 121 ohms, /__-25_degrees__ 0 191 ohms, /__-85_degrees__ 0 161 ohms, /__-65_degrees__ 0 141 ohms, /__-45_degrees__ 1 E5E07 In polar coordinates, what is the impedance of a network comprised of a 100-ohm-reactance capacitor in parallel with a 100-ohm resistor? 0 31 ohms, /__-15_degrees__ 0 51 ohms, /__-25_degrees__ 0 71 ohms, /__-45_degrees__ 1 91 ohms, /__-65_degrees__ 0 E5E08 In polar coordinates, what is the impedance of a network comprised of a 300-ohm-reactance inductor in series with a 400-ohm resistor? 0 400 ohms, /__27_degrees__ 0 500 ohms, /__37_degrees__ 1 500 ohms, /__47_degrees__ 0 700 ohms, /__57_degrees__ 0 E5E09 When using rectangular coordinates to graph the impedance of a circuit, what does the horizontal axis represent? 0 The voltage or current associated with the resistive component 1 The voltage or current associated with the reactive component 0 The sum of the reactive and resistive components 0 The difference between the resistive and reactive components 0 E5E10 When using rectangular coordinates to graph the impedance of a circuit, what does the vertical axis represent? 0 The voltage or current associated with the resistive component 0 The voltage or current associated with the reactive component 1 The sum of the reactive and resistive components 0 The difference between the resistive and reactive components 0 E5E11 What do the two numbers represent that are used to define a point on a graph using rectangular coordinates? 0 The horizontal and inverted axes 0 The vertical and inverted axes 0 The coordinate values along the horizontal and vertical axes 1 The phase angle with respect to its prime center 0 E5E12 If you plot the impedance of a circuit using the rectangular coordinate system and find the impedance point falls on the right side of the graph on the horizontal line, what do you know about the circuit? 0 It has to be a direct current circuit 0 It contains resistance and capacitive reactance 0 It contains resistance and inductive reactance 0 It is equivalent to a pure resistance 1 E5E13 Why would you plot the impedance of a circuit using the polar coordinate system? 0 To display the data on an XY chart 0 To give a visual representation of the phase angle 1 To graphically represent the DC component 0 To show the reactance which is present 0 E5E14 What coordinate system can be used to display the resistive, inductive, and/or capacitive reactance components of an impedance? 0 Maidenhead grid 0 National Bureau of Standards 0 Faraday 0 Rectangular 1 E5E15 What coordinate system can be used to display the phase angle of a circuit containing resistance, inductive and/or capacitive reactance? 0 Maidenhead grid 0 National Bureau of Standards 0 Faraday 0 Polar 1 E5E16 In polar coordinates, what is the impedance of a circuit of 100 -j100 ohms impedance? 0 141 ohms, /__-45_degrees__ 1 100 ohms, /__45_degrees__ 0 100 ohms, /__-45_degrees__ 0 141 ohms, /__45_degrees__ 0 E5E17 In polar coordinates, what is the impedance of a circuit that has an admittance of 7.09 millisiemens at 45 degrees? 0 5.03 x 10(-5) ohms, /__45_degrees__ 0 141 ohms, /__-45_degrees__ 1 19,900 ohms, /__-45_degrees__ 0 141 ohms, /__45_degrees__ 0 E5E18 In rectangular coordinates, what is the impedance of a circuit that has an admittance of 5 millisiemens at -30 degrees? 0 173 - j100 ohms 0 200 + j100 ohms 0 173 + j100 ohms 1 200 - j100 ohms 0 E5E19 In rectangular coordinates, what is the admittance of a circuit that has an impedance of 240 ohms at 36.9 degrees? 0 3.33 x 10(-3) - j2.50 x 10(-3) siemens 1 3.33 x 10(-3) + j2.50 x 10(-3) siemens 0 192 + j144 siemens 0 3.33 - j2.50 siemens 0 E5E20 In polar coordinates, what is the impedance of a series circuit consisting of a resistance of 4 ohms, an inductive reactance of 4 ohms, and a capacitive reactance of 1 ohm? 0 6.4 ohms, /__53_degrees__ 0 5 ohms, /__37_degrees__ 1 5 ohms, /__45_degrees__ 0 10 ohms, /__-51_degrees__ 0 E5E21 Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 400 ohm resistor and a 38 picofarad capacitor at 14 MHz? 0 Point 2 0 Point 4 1 Point 5 0 Point 6 0 E5E22 Which point in Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and an 18 microhenry inductor at 3.505 MHz? 0 Point 1 0 Point 3 1 Point 7 0 Point 8 0 E5E23 Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and a 19 picofarad capacitor at 21.200 MHz? 0 Point 1 1 Point 3 0 Point 7 0 Point 8 0 E5F01 What is the result of skin effect? 0 As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface 1 As frequency decreases, RF current flows in a thinner layer of the conductor, closer to the surface 0 Thermal effects on the surface of the conductor increase the impedance 0 Thermal effects on the surface of the conductor decrease the impedance 0 E5F02 What effect causes most of an RF current to flow along the surface of a conductor? 0 Layer effect 0 Seeburg effect 0 Skin effect 1 Resonance effect 0 E5F03 Where does almost all RF current flow in a conductor? 0 Along the surface of the conductor 1 In the center of the conductor 0 In a magnetic field around the conductor 0 In a magnetic field in the center of the conductor 0 E5F04 Why does most of an RF current flow near the surface of a conductor? 0 Because a conductor has AC resistance due to self-inductance 0 Because the RF resistance of a conductor is much less than the DC resistance 0 Because of the heating of the conductor's interior 0 Because of skin effect 1 E5F05 Why is the resistance of a conductor different for RF currents than for direct currents? 0 Because the insulation conducts current at high frequencies 0 Because of the Heisenburg Effect 0 Because of skin effect 1 Because conductors are non-linear devices 0 E5F06 What device is used to store electrical energy in an electrostatic field? 0 A battery 0 A transformer 0 A capacitor 1 An inductor 0 E5F07 What unit measures electrical energy stored in an electrostatic field? 0 Coulomb 0 Joule 1 Watt 0 Volt 0 E5F08 What is a magnetic field? 0 Current through the space around a permanent magnet 0 The space through which a magnetic force acts 1 The space between the plates of a charged capacitor, through which a magnetic force acts 0 The force that drives current through a resistor 0 E5F09 In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow? 0 In the same direction as the current 0 In a direction opposite to the current 0 In all directions; omnidirectional 0 In a direction determined by the left-hand rule 1 E5F10 What determines the strength of a magnetic field around a conductor? 0 The resistance divided by the current 0 The ratio of the current to the resistance 0 The diameter of the conductor 0 The amount of current 1 E5F11 What is the term for energy that is stored in an electromagnetic or electrostatic field? 0 Amperes-joules 0 Potential energy 1 Joules-coulombs 0 Kinetic energy 0 E5G01 What is the Q of a parallel R-L-C circuit if the resonant frequency is 14.128 MHz, L is 2.7 microhenrys and R is 18 kilohms? 0 75.1 1 7.51 0 71.5 0 0.013 0 E5G02 What is the Q of a parallel R-L-C circuit if the resonant frequency is 4.468 MHz, L is 47 microhenrys and R is 180 ohms? 0 0.00735 0 7.35 0 0.136 1 13.3 0 E5G03 What is the Q of a parallel R-L-C circuit if the resonant frequency is 7.125 MHz, L is 8.2 microhenrys and R is 1 kilohm? 0 36.8 0 0.273 0 0.368 0 2.72 1 E5G04 What is the Q of a parallel R-L-C circuit if the resonant frequency is 7.125 MHz, L is 12.6 microhenrys and R is 22 kilohms? 0 22.1 0 39 1 25.6 0 0.0256 0 E5G05 What is the Q of a parallel R-L-C circuit if the resonant frequency is 3.625 MHz, L is 42 microhenrys and R is 220 ohms? 0 23 0 0.00435 0 4.35 0 0.23 1 E5G06 Why is a resistor often included in a parallel resonant circuit? 0 To increase the Q and decrease the skin effect 0 To decrease the Q and increase the resonant frequency 0 To decrease the Q and increase the bandwidth 1 To increase the Q and decrease the bandwidth 0 E5G07 What is the term for an out-of-phase, nonproductive power associated with inductors and capacitors? 0 Effective power 0 True power 0 Peak envelope power 0 Reactive power 1 E5G08 In a circuit that has both inductors and capacitors, what happens to reactive power? 0 It is dissipated as heat in the circuit 0 It goes back and forth between magnetic and electric fields, but is not dissipated 1 It is dissipated as kinetic energy in the circuit 0 It is dissipated in the formation of inductive and capacitive fields 0 E5G09 In a circuit where the AC voltage and current are out of phase, how can the true power be determined? 0 By multiplying the apparent power times the power factor 1 By subtracting the apparent power from the power factor 0 By dividing the apparent power by the power factor 0 By multiplying the RMS voltage times the RMS current 0 E5G10 What is the power factor of an R-L circuit having a 60 degree phase angle between the voltage and the current? 0 1.414 0 0.866 0 0.5 1 1.73 0 E5G11 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? 0 400 watts 0 80 watts 1 2000 watts 0 50 watts 0 E5G12 Why would the power used in a circuit be less than the product of the magnitudes of the AC voltage and current? 0 Because there is a phase angle greater than zero between the current and voltage 1 Because there are only resistances in the circuit 0 Because there are no reactances in the circuit 0 Because there is a phase angle equal to zero between the current and voltage 0 E5G13 What is the Q of a parallel RLC circuit if the resonant frequency is 14.128 MHz, L is 4.7 microhenrys and R is 18 kilohms? 0 4.31 0 43.1 1 13.3 0 0.023 0 E5G14 What is the Q of a parallel RLC circuit if the resonant frequency is 14.225 MHz, L is 3.5 microhenrys and R is 10 kilohms? 0 7.35 0 0.0319 0 71.5 0 31.9 1 E5G15 What is the Q of a parallel RLC circuit if the resonant frequency is 7.125 MHz, L is 10.1 microhenrys and R is 100 ohms? 0 0.221 1 4.52 0 0.00452 0 22.1 0 E5G16 What is the Q of a parallel RLC circuit if the resonant frequency is 3.625 MHz, L is 3 microhenrys and R is 2.2 kilohms? 0 0.031 0 32.2 1 31.1 0 25.6 0 E5H01 What is the effective radiated power of a repeater station with 50 watts transmitter power output, 4-dB feed line loss, 2-dB duplexer loss, 1-dB circulator loss and 6-dBd antenna gain? 0 199 watts 0 39.7 watts 1 45 watts 0 62.9 watts 0 E5H02 What is the effective radiated power of a repeater station with 50 watts transmitter power output, 5-dB feed line loss, 3-dB duplexer loss, 1-dB circulator loss and 7-dBd antenna gain? 0 79.2 watts 0 315 watts 0 31.5 watts 1 40.5 watts 0 E5H03 What is the effective radiated power of a station with 75 watts transmitter power output, 4-dB feed line loss and 10-dBd antenna gain? 0 600 watts 0 75 watts 0 150 watts 0 299 watts 1 E5H04 What is the effective radiated power of a repeater station with 75 watts transmitter power output, 5-dB feed line loss, 3-dB duplexer loss, 1-dB circulator loss and 6-dBd antenna gain? 0 37.6 watts 1 237 watts 0 150 watts 0 23.7 watts 0 E5H05 What is the effective radiated power of a station with 100 watts transmitter power output, 1-dB feed line loss and 6-dBd antenna gain? 0 350 watts 0 500 watts 0 20 watts 0 316 watts 1 E5H06 What is the effective radiated power of a repeater station with 100 watts transmitter power output, 5-dB feed line loss, 3-dB duplexer loss, 1-dB circulator loss and 10-dBd antenna gain? 0 794 watts 0 126 watts 1 79.4 watts 0 1260 watts 0 E5H07 What is the effective radiated power of a repeater station with 120 watts transmitter power output, 5-dB feed line loss, 3-dB duplexer loss, 1-dB circulator loss and 6-dBd antenna gain? 0 601 watts 0 240 watts 0 60 watts 1 79 watts 0 E5H08 What is the effective radiated power of a repeater station with 150 watts transmitter power output, 2-dB feed line loss, 2.2-dB duplexer loss and 7-dBd antenna gain? 0 1977 watts 0 78.7 watts 0 420 watts 0 286 watts 1 E5H09 What is the effective radiated power of a repeater station with 200 watts transmitter power output, 4-dB feed line loss, 3.2-dB duplexer loss, 0.8-dB circulator loss and 10-dBd antenna gain? 0 317 watts 1 2000 watts 0 126 watts 0 300 watts 0 E5H10 What is the effective radiated power of a repeater station with 200 watts transmitter power output, 2-dB feed line loss, 2.8-dB duplexer loss, 1.2-dB circulator loss and 7-dBd antenna gain? 0 159 watts 0 252 watts 1 632 watts 0 63.2 watts 0 E5H11 What term describes station output (including the transmitter, antenna and everything in between), when considering transmitter power and system gains and losses? 0 Power factor 0 Half-power bandwidth 0 Effective radiated power 1 Apparent power 0 E5H12 What is reactive power? 0 Wattless, nonproductive power 1 Power consumed in wire resistance in an inductor 0 Power lost because of capacitor leakage 0 Power consumed in circuit Q 0 E5H13 What is the power factor of an RL circuit having a 45 degree phase angle between the voltage and the current? 0 0.866 0 1.0 0 0.5 0 0.707 1 E5H14 What is the power factor of an RL circuit having a 30 degree phase angle between the voltage and the current? 0 1.73 0 0.5 0 0.866 1 0.577 0 E5H15 How many watts are consumed in a circuit having a power factor of 0.6 if the input is 200V AC at 5 amperes? 0 200 watts 0 1000 watts 0 1600 watts 0 600 watts 1 E5H16 How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500 watts? 0 704 W 0 355 W 1 252 W 0 1.42 mW 0 E5I01 What is photoconductivity? 0 The conversion of photon energy to electromotive energy 0 The increased conductivity of an illuminated semiconductor junction 1 The conversion of electromotive energy to photon energy 0 The decreased conductivity of an illuminated semiconductor junction 0 E5I02 What happens to the conductivity of a photoconductive material when light shines on it? 0 It increases 1 It decreases 0 It stays the same 0 It becomes unstable 0 E5I03 What happens to the resistance of a photoconductive material when light shines on it? 0 It increases 0 It becomes unstable 0 It stays the same 0 It decreases 1 E5I04 What happens to the conductivity of a semiconductor junction when light shines on it? 0 It stays the same 0 It becomes unstable 0 It increases 1 It decreases 0 E5I05 What is an optocoupler? 0 A resistor and a capacitor 0 A frequency modulated helium-neon laser 0 An amplitude modulated helium-neon laser 0 An LED and a phototransistor 1 E5I06 What is an optoisolator? 0 An LED and a phototransistor 1 A P-N junction that develops an excess positive charge when exposed to light 0 An LED and a capacitor 0 An LED and a solar cell 0 E5I07 What is an optical shaft encoder? 0 An array of neon or LED indicators whose light transmission path is controlled by a rotating wheel 0 An array of optocouplers whose light transmission path is controlled by a rotating wheel 1 An array of neon or LED indicators mounted on a rotating wheel in a coded pattern 0 An array of optocouplers mounted on a rotating wheel in a coded pattern 0 E5I08 What characteristic of a crystalline solid will photoconductivity change? 0 The capacitance 0 The inductance 0 The specific gravity 0 The resistance 1 E5I09 Which material will exhibit the greatest photoconductive effect when visible light shines on it? 0 Potassium nitrate 0 Lead sulfide 0 Cadmium sulfide 1 Sodium chloride 0 E5I10 Which material will exhibit the greatest photoconductive effect when infrared light shines on it? 0 Potassium nitrate 0 Lead sulfide 1 Cadmium sulfide 0 Sodium chloride 0 E5I11 Which material is affected the most by photoconductivity? 0 A crystalline semiconductor 1 An ordinary metal 0 A heavy metal 0 A liquid semiconductor 0 E5I12 What characteristic of optoisolators is often used in power supplies? 0 They have low impedance between the light source and the phototransistor 0 They have very high impedance between the light source and the phototransistor 1 They have low impedance between the light source and the LED 0 They have very high impedance between the light source and the LED 0 E5I13 What characteristic of optoisolators makes them suitable for use with a triac to form the solid-state equivalent of a mechanical relay for a 120 V AC household circuit? 0 Optoisolators provide a low impedance link between a control circuit and a power circuit 0 Optoisolators provide impedance matching between the control circuit and power circuit 0 Optoisolators provide a very high degree of electrical isolation between a control circuit and a power circuit 1 Optoisolators eliminate (isolate) the effects of reflected light in the control circuit 0