Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Marine Electrical Systems (Set 45)
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Question 1 of 30
A carbon resistor has a resistance of 50 ohms, and a tolerance of 5 percent. What would be the respective colors indicated for bands 1, 2, 3 and 4 for this resistor as shown in figure "A" of the illustration? EL-0103
Browse Questions in Set 45
30 MCQs #1 A carbon resistor has a resistance of 50 ohms, and a tolerance of 5 percent. What would be the respective colors indicated for bands 1, 2, 3 and 4 for this resistor as shown in figure "A" of the illustration? EL-0103 #2 Which of the procedures or conditions listed could result in damaging a transistor beyond repair? #3 An ohmmeter used to test for front-to-back resistance of a PN junction diode should produce roughly what ratio? #4 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 functioning properly? EL-0213 #5 What should be done with a capacitor that is obviously discolored due to excessive heat? #6 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 0.70 V when configured as in figure "A" and displays OL V when configured as in figure "B"? Illustration EL-0212 #7 In order to check the performance of a transistor removed from its circuit, what meter or tester should be used? #8 Which of the following conditions would most likely lead to the failure of a resistor due to overheating? #9 What would be the indication of a burned-out LED? #10 What is the most common and reliable type of circuit breaker used for high voltage practice aboard ship? #11 Some shipboard high voltage systems have the neutral point of the generators bonded to the ship's hull with a neutral grounding resistor? What is the purpose of this resistor? #12 Suppose it is desired to determine the integrity of the insulation of a 4160 VAC motor. What type of insulation resistance tester (megger) would be suitable? #13 Before work may safely commence on a high voltage system, what must first be done after disconnection and isolation? #14 In order for a live-line tester to be used to test and prove dead a high voltage circuit, what must be done to verify the ability of the tester to detect a voltage? #15 In addition to high voltage circuit grounding with ground-connecting switching devices, for additional operator safety and confidence, portable grounding straps may be used. What is the proper procedure for connecting these portable grounding straps? #16 When completing repairs on a high voltage circuit where portable grounding straps were used for increased operator safety and confidence, what is the proper procedure for disconnecting these grounding straps? #17 For a motor rated at 3.3 kV, what would be a minimum accepted insulation resistance to hull ground as tested by an appropriate megger (insulation tester)? #18 When an high voltage system insulation test value is suspect or recorded during an annual survey, a polarization index test is performed. What is the polarization index? #19 On vessels with AC distribution systems, which of the following statements represents the most difficult problem involved in obtaining a DC potential suitable for use by computer components? #20 What statement is true concerning read only memory (ROM)? #21 What statement is true concerning random access memory (RAM)? #22 Which of the following devices represents primary storage, where the processor is able to directly read instructions and data and directly return results of its computation in fetch/execute cycles? #23 Which of the following data communication cable types offers the greatest immunity to electromagnetic "noise"? #24 What type of local area network physical topology features point-to-point interconnection between all communicating devices and is the least vulnerable to a break in communication? #25 Modern ships use multiple computers arranged in a client/server network to perform various shipboard functions. What type of computer network would most likely be used aboard ship? #26 What Ethernet cabling technology supports the greatest data transfer speeds? #27 If an 8-bit digital to analog converter (DAC) produces an analog output voltage with a range of 10 volts (0-9 volts), what is the smallest incremental step in voltage that can be generated at the output? #28 If a computer display is flickering, how may this be remedied? #29 According to the liquid crystal data display for the depth sounder shown in the illustration, what is the instantaneous depth currently being displayed? EL-0186
Illustration EL-0186: the U.S. Coast Guard has not released this illustration. #30 Using the trouble analysis chart and faults table provided in the illustration, if the gyrocompass was malfunctioning, but no fault codes are present on the display unit, what is most likely the problem if the DC/DC converter LED status indicator is functioning properly, but the CPU LED status indicator is not blinking? EL-0195
Illustration EL-0195: the U.S. Coast Guard has not released this illustration.
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