G5 Questions
37 questions in this subelement. Click any question ID for more details.
Answer: B
What is reactance?
AOpposition to the flow of direct current caused by resistance
BOpposition to the flow of alternating current caused by capacitance or inductance
CReinforcement of the flow of direct current caused by resistance
DReinforcement of the flow of alternating current caused by capacitance or inductance
Answer: D
Which of the following is opposition to the flow of alternating current in an inductor?
AConductance
BReluctance
CAdmittance
DReactance
Answer: C
Which of the following is opposition to the flow of alternating current in a capacitor?
AConductance
BReluctance
CReactance
DAdmittance
Answer: D
How does an inductor react to AC?
AAs the frequency of the applied AC increases, the reactance decreases
BAs the amplitude of the applied AC increases, the reactance increases
CAs the amplitude of the applied AC increases, the reactance decreases
DAs the frequency of the applied AC increases, the reactance increases
Answer: A
How does a capacitor react to AC?
AAs the frequency of the applied AC increases, the reactance decreases
BAs the frequency of the applied AC increases, the reactance increases
CAs the amplitude of the applied AC increases, the reactance increases
DAs the amplitude of the applied AC increases, the reactance decreases
Answer: D
What is the term for the inverse of impedance?
AConductance
BSusceptance
CReluctance
DAdmittance
Answer: C
What is impedance?
AThe ratio of current to voltage
BThe product of current and voltage
CThe ratio of voltage to current
DThe product of current and reactance
Answer: D
Which of the following devices can be used for impedance matching at radio frequencies?
AA transformer
BA Pi-network
CA length of transmission line
DAll these choices are correct
Answer: D
What occurs in an LC circuit at resonance?
ACurrent and voltage are equal
BResistance is cancelled
CThe circuit radiates all its energy in the form of radio waves
DInductive reactance and capacitive reactance cancel
Answer: C
How does the total current relate to the individual currents in a circuit of parallel resistors?
AIt equals the average of the branch currents
BIt decreases as more parallel branches are added to the circuit
CIt equals the sum of the currents through each branch
DIt is the sum of the reciprocal of each individual voltage drop
Answer: B
How many watts of electrical power are consumed if 400 VDC is supplied to an 800-ohm load?
A0.5 watts
B200 watts
C400 watts
D3200 watts
Answer: A
How many watts of electrical power are consumed by a 12 VDC light bulb that draws 0.2 amperes?
A2.4 watts
B24 watts
C6 watts
D60 watts
Answer: A
How many watts are consumed when a current of 7.0 milliamperes flows through a 1,250-ohm resistance?
AApproximately 61 milliwatts
BApproximately 61 watts
CApproximately 11 milliwatts
DApproximately 11 watts
Answer: B
What is the PEP produced by 200 volts peak-to-peak across a 50-ohm dummy load?
A1.4 watts
B100 watts
C353.5 watts
D400 watts
Answer: C
What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?
AThe peak-to-peak value
BThe peak value
CThe RMS value
DThe reciprocal of the RMS value
Answer: D
What is the peak-to-peak voltage of a sine wave with an RMS voltage of 120 volts?
A84.8 volts
B169.7 volts
C240.0 volts
D339.4 volts
Answer: B
What is the RMS voltage of a sine wave with a value of 17 volts peak?
A8.5 volts
B12 volts
C24 volts
D34 volts
Answer: C
What percentage of power loss is equivalent to a loss of 1 dB?
A10.9 percent
B12.2 percent
C20.6 percent
D25.9 percent
Answer: B
What is the ratio of PEP to average power for an unmodulated carrier?
A0.707
B1.00
C1.414
D2.00
Answer: B
What is the RMS voltage across a 50-ohm dummy load dissipating 1200 watts?
A173 volts
B245 volts
C346 volts
D692 volts
Answer: B
What is the output PEP of an unmodulated carrier if the average power is 1060 watts?
A530 watts
B1060 watts
C1500 watts
D2120 watts
Answer: B
What is the output PEP of 500 volts peak-to-peak across a 50-ohm load?
A8.75 watts
B625 watts
C2500 watts
D5000 watts
Answer: A
What is the output voltage if an input signal is applied to the secondary winding of a 4:1 voltage step-down transformer instead of the primary winding?
AThe input voltage is multiplied by 4
BThe input voltage is divided by 4
CAdditional resistance must be added in series with the primary to prevent overload
DAdditional resistance must be added in parallel with the secondary to prevent overload
Answer: A
What is the total resistance of a 10-, a 20-, and a 50-ohm resistor connected in parallel?
A5.9 ohms
B0.17 ohms
C17 ohms
D80 ohms
Answer: D
What is the approximate total resistance of a 100- and a 200-ohm resistor in parallel?
A300 ohms
B150 ohms
C75 ohms
D67 ohms
Answer: B
Why is the primary winding wire of a voltage step-up transformer usually a larger size than that of the secondary winding?
ATo improve the coupling between the primary and secondary
BTo accommodate the higher current of the primary
CTo prevent parasitic oscillations due to resistive losses in the primary
DTo ensure that the volume of the primary winding is equal to the volume of the secondary winding
Answer: A
What is the voltage output of a transformer with a 500-turn primary and a 1500-turn secondary when 120 VAC is applied to the primary?
A360 volts
B120 volts
C40 volts
D25.5 volts
Answer: A
What transformer turns ratio matches an antenna’s 600-ohm feed point impedance to a 50-ohm coaxial cable?
A3.5 to 1
B12 to 1
C24 to 1
D144 to 1
Answer: D
What is the equivalent capacitance of two 5.0-nanofarad capacitors and one 750-picofarad capacitor connected in parallel?
A576.9 nanofarads
B1,733 picofarads
C3,583 picofarads
D10.750 nanofarads
Answer: C
What is the capacitance of three 100-microfarad capacitors connected in series?
A0.33 microfarads
B3.0 microfarads
C33.3 microfarads
D300 microfarads
Answer: C
What is the inductance of three 10-millihenry inductors connected in parallel?
A0.30 henries
B3.3 henries
C3.3 millihenries
D30 millihenries
Answer: C
What is the inductance of a circuit with a 20-millihenry inductor connected in series with a 50-millihenry inductor?
A7 millihenries
B14.3 millihenries
C70 millihenries
D1,000 millihenries
Answer: B
What is the capacitance of a 20-microfarad capacitor connected in series with a 50-microfarad capacitor?
A0.07 microfarads
B14.3 microfarads
C70 microfarads
D1,000 microfarads
Answer: C
Which of the following components should be added to a capacitor to increase the capacitance?
AAn inductor in series
BAn inductor in parallel
CA capacitor in parallel
DA capacitor in series
Answer: D
Which of the following components should be added to an inductor to increase the inductance?
AA capacitor in series
BA capacitor in parallel
CAn inductor in parallel
DAn inductor in series