Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Marine Electrical Systems (Set 20)
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Question 1 of 30
In figure "A" of the illustration, 12 volts is applied to the circuit where the resistance of R1 is 10 ohms and R2 is 10 ohms. what is the voltage across R2 when the switch is closed? EL-0020
Browse Questions in Set 20
30 MCQs #1 In figure "A" of the illustration, 12 volts is applied to the circuit where the resistance of R1 is 10 ohms and R2 is 10 ohms. what is the voltage across R2 when the switch is closed? EL-0020 #2 As shown in figure "A" of the illustration, what would be the circuit impedance if the capacitive reactance is 10 ohms and the resistance is 10 ohms? EL-0109 #3 In the schematic of the electrical circuit shown in figure "A" of the illustration, what is the value of the total capacitance, when compared to the value of equal individual capacitors? EL-0039 #4 An AC circuit has a capacitive reactance of 30 ohms in addition to an inductive reactance of 40 ohms connected in series. What is the total reactance of the circuit? #5 Two 100 watt light bulbs rated at 100 volts are connected in parallel across a 100 volt power supply. What will be the total power consumed by the two bulbs? #6 If a circuit has resistances of 5, 10, and 20 ohms connected in parallel, what is the combined total resistance of the circuit? #7 In the schematic of the electrical circuit shown in figure "A" of the illustration, what is the value of the total capacitance, when compared to the value of equal individual capacitors? EL-0038 #8 What would be the total capacitance of the circuit illustrated in figure "A" if the value of capacitor C1 was 100 microfarads and capacitor C2 was 200 microfarads? EL-0038 #9 What would be the total current in figure "A" of the circuit illustrated if the value of capacitor C1 was 100 microfarads, capacitor C2 was 200 microfarads and the power supply was 240 volts at 60 Hz? EL-0038 #10 What would be the capacitive reactance of the circuit shown in figure "A" of the illustration if the capacitance of C1 was 100 microfarads, the capacitance of C2 was 200 microfarads and the frequency of the source was 60 cycles per second (Hz)? EL-0038 #11 What is the current flowing through R3 in figure "B" of the illustrated circuit when the switch is closed if the battery voltage is 12 VDC and resistance of R1 is 2 ohms, R2 is 3 ohms, and R3 is 6 ohms, respectively? EL-0019 #12 What would be the voltage drop across the parallel branches of the circuit shown in figure "B" of the illustration if the source voltage is 30 volts, the resistance for R1 is 10 ohms, the resistance for R2 is 10 ohms and the resistance for R3 is 10 ohms? EL-0032 #13 What would be the voltage drop across the series string of the circuit shown in figure "A" of the illustration if the source voltage is 30 volts, the resistance for R1 is 10 ohms, the resistance for R2 is 10 ohms and the resistance for R3 is 10 ohms? Illustration EL-0032 #14 What would be the total current draw of the circuit as shown in figure "A" of the illustration if the source voltage is 24 volts, the resistance for R1 is 12 ohms, the resistance for R2 is 24 ohms, and the resistance for R3 is 36 ohms? Illustration EL-0032 #15 What would the total power consumed by the circuit as shown in figure "A" of the illustration if the source voltage is 12 volts, the resistance for R1 is 470 ohms, the resistance of R2 is 330 ohms, and the resistance of R3 is 800 ohms? Illustration EL-0032 #16 What would the total power consumed by the circuit as shown in figure "B" of the illustration if the source voltage is 12 volts, the resistance for R1 is 470 ohms, the resistance of R2 is 800 ohms, and the resistance of R3 is 330 ohms? Illustration EL-0032 #17 The turns ratio of the tapped step down transformer shown in figure "C" of the illustration is four to one and all taps are equally spaced. If 440 volts were applied between 'H1' and 'H4', what would appear across 'X1' and 'X4'? EL-0082 #18 The turns ratio of the tapped step down transformer shown in figure "C" of the illustration is four to one and all taps are evenly spaced. If 120 volts were applied to terminals 'H1' and 'H3', what would appear at 'X1' and 'X2'? EL-0082 #19 In figure "1" of the diagram shown in the illustration, the three phase step down power transformer has a turns ratio of four to one. If a three-phase 440 volt supply is connected to terminals "A1-B1-C1", what voltage should develop across terminals "A2-B2-C2"? EL-0084 #20 In figure "2" of the diagram shown in the illustration, the three phase step down power transformer has a turns ratio of four to one. If a three-phase 480 volt supply is connected to terminals "A1-B1-C1", what voltage should develop across terminals "A2-B2-C2"? Illustration EL-0084 #21 In figure "4" of the diagram in the illustration, the three phase step down power transformer has a turns ratio of five to one. If a three-phase 4160 volt supply is connected to terminals "A1-B1-B2", what voltage should develop across terminals "A2- B2-C2"? Illustration EL-0084 #22 A simple, untapped, single-phase 480/120 VAC step-down control transformer is rated at 600VA at 60 Hz. Neglecting power factor, what is the rated secondary load current? #23 What would be the synchronous speed of an eight-pole three-phase squirrel-cage induction motor operating at 60 Hz? #24 What would be the synchronous speed of a 24-pole three-phase synchronous motor operating at 20 Hz? #25 What would be the actual rotor speed for a 4-pole three-phase squirrel-cage induction motor operating at 60 Hz if the rotor slip is 3%? #26 If a 12-pole three-phase synchronous alternator is operating at 590 rpm, what will be its output frequency? #27 A six-pole three-phase squirrel-cage induction motor operating at 60 Hz is running at 1155 rpm. What is the percentage slip in this case? #28 Which figure shown in the illustration represents the schematic symbol shown in figure "2"? EL-0034 #29 As shown in the illustrated devices and symbols, which of the symbols shown in the illustration represents a standard normally closed relay contact? EL-0005 #30 Which of the electronic schematic symbols represents the capacitor illustrated in figure 1 of the illustration? Illustration EL-0015
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