General › G5
G5 Electrical Principles
40 questions in the pool. Your exam will include 3, one from each group below.
G5A
Reactance; inductance; capacitance; impedance; impedance transformation; resonance
- G5A01What happens when inductive and capacitive reactance are equal in a series LC circuit?
- G5A02What is reactance?
- G5A03Which of the following is opposition to the flow of alternating current in an inductor?
- G5A04Which of the following is opposition to the flow of alternating current in a capacitor?
- G5A05How does an inductor react to AC?
- G5A06How does a capacitor react to AC?
- G5A07What is the term for the inverse of impedance?
- G5A08What is impedance?
- G5A09What unit is used to measure reactance?
- G5A10Which of the following devices can be used for impedance matching at radio frequencies?
- G5A11What letter is used to represent reactance?
- G5A12What occurs in an LC circuit at resonance?
G5B
The decibel; current and voltage dividers; electrical power calculations; sine wave root-mean-square (RMS) values; PEP calculations
- G5B01What dB change represents a factor of two increase or decrease in power?
- G5B02How does the total current relate to the individual currents in a circuit of parallel resistors?
- G5B03How many watts of electrical power are consumed if 400 VDC is supplied to an 800-ohm load?
- G5B04How many watts of electrical power are consumed by a 12 VDC light bulb that draws 0.2 amperes?
- G5B05How many watts are consumed when a current of 7.0 milliamperes flows through a 1,250-ohm resistance?
- G5B06What is the PEP produced by 200 volts peak-to-peak across a 50-ohm dummy load?
- G5B07What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?
- G5B08What is the peak-to-peak voltage of a sine wave with an RMS voltage of 120 volts?
- G5B09What is the RMS voltage of a sine wave with a value of 17 volts peak?
- G5B10What percentage of power loss is equivalent to a loss of 1 dB?
- G5B11What is the ratio of PEP to average power for an unmodulated carrier?
- G5B12What is the RMS voltage across a 50-ohm dummy load dissipating 1200 watts?
- G5B13What is the output PEP of an unmodulated carrier if the average power is 1060 watts?
- G5B14What is the output PEP of 500 volts peak-to-peak across a 50-ohm load?
G5C
Resistors, capacitors, and inductors in series and parallel; transformers
- G5C01What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?
- G5C02What 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?
- G5C03What is the total resistance of a 10-, a 20-, and a 50-ohm resistor connected in parallel?
- G5C04What is the approximate total resistance of a 100- and a 200-ohm resistor in parallel?
- G5C05Why is the primary winding wire of a voltage step-up transformer usually a larger size than that of the secondary winding?
- G5C06What 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?
- G5C07What transformer turns ratio matches an antenna's 600-ohm feed point impedance to a 50-ohm coaxial cable?
- G5C08What is the equivalent capacitance of two 5.0-nanofarad capacitors and one 750-picofarad capacitor connected in parallel?
- G5C09What is the capacitance of three 100-microfarad capacitors connected in series?
- G5C10What is the inductance of three 10-millihenry inductors connected in parallel?
- G5C11What is the inductance of a circuit with a 20-millihenry inductor connected in series with a 50-millihenry inductor?
- G5C12What is the capacitance of a 20-microfarad capacitor connected in series with a 50-microfarad capacitor?
- G5C13Which of the following components should be added to a capacitor to increase the capacitance?
- G5C14Which of the following components should be added to an inductor to increase the inductance?