Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR

USCG Marine Electrical Systems (Set 15)

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Question 1 of 30

What is the correct name for the device used in an electrical circuit to change alternating current to direct current?

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30 MCQs

#1 What is the correct name for the device used in an electrical circuit to change alternating current to direct current? #2 What is the direction of electron current through the load resistor in the circuit shown in the illustration? Illustration EL-0085 #3 What does the drawing in the illustrated circuit represent? Illustration EL-0063 #4 Which section of the circuit shown in the illustration smoothes out highest degree of pulsations? Illustration EL-0085 #5 The characteristics of the device shown in figure "8" of the illustration includes a stable voltage and low current while operating. Because of this, it can be suitably used in what type of circuit? Illustration EL-0065 #6 What is the name of the component labeled Q1 as shown in section "D" of the regulated DC power supply illustrated? Illustration EL-0085 #7 What is the name of the semiconductor that decreases in resistance with an increase in temperature? #8 Which of the pictured solid-state semiconductor devices in the illustration is a rectifier bridge? Illustration EL-0068 #9 A triac thyristor functions as a control device and can be thought of to function similarly as which of the following circuits? #10 Basically, a magnetic amplifier is a saturable-core reactor with the addition of what additional feature? #11 When a solid-state component of an electronic circuit is mounted to a metallic mass, what is the general purpose of that mass? #12 What will happen to a carbon resistor operating in electrical equipment that is NOT properly cooled? #13 How can the nominal resistance value of a typical carbon resistor in a circuit best be determined? #14 Although saturable reactors are extremely useful in some applications, why is their gain low? #15 Before touching a small capacitor connected to a de-energized circuit, or even one that is completely disconnected, you should do what FIRST? #16 Which of the following statements represents the important factor that must be considered when replacing a faulty diode in a generators excitation field rectifier assembly? #17 Two contributors of electronic console failures are heat and vibration. To combat some of their effects, what should be included in performing preventive maintenance procedures? #18 If a delicate component must be soldered into a circuit, how can the component be protected from the heat of the soldering process? #19 Which type of flux should be used when soldering electrical wire connections for electronic components on printed circuit boards? #20 What should be done with a capacitor that is obviously discolored due to excessive heat? #21 If a digital multimeter is set up as shown in figures "A" and "B" of the illustration, what is the status of the silicon diode if the display reads OL ohms when configured as in figure "A" and reads OL ohms when configured as in figure "B"? Illustration EL-0211 #22 If a digital multimeter is set up as shown in figure "B" of the illustration to test a capacitor, what would the display read if the capacitor was functioning properly? Illustration EL-0213 #23 What is the name of the device shown in figure "2" of the illustration? Illustration EL-0068 #24 If a digital multimeter is set up as shown in figures "A" and "B" to test a silicon diode, what is the status of the diode if the screen displays OL V when configured as in figure "A" and displays OL V when configured as in figure "B"? Illustration EL-0212 #25 If a digital multimeter is set up as shown in figure "A" of the illustration to test a capacitor, what would the display read if the capacitor is shorted? Illustration EL-0213 #26 A capacitor is to be tested with a digital multimeter set up to measure ohms. If the meter is connected to a shorted capacitor, how would the meter display respond? #27 When troubleshooting electronic equipment, why should you use a high impedance multimeter? #28 Which of the following conditions would most likely lead to the failure of a resistor due to overheating? #29 What would be the indication of a burned-out LED? #30 Which of the following would best describe a standard electric meter movement that uses the principles of electromagnetism to measure current?

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