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

USCG Marine Electrical Systems (Set 3)

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Question 1 of 30

AC circuits can possess characteristics of resistance, inductance, and capacitance. In terms of units of measure, how is the capacitive reactance of the circuit expressed?

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30 MCQs

#1 AC circuits can possess characteristics of resistance, inductance, and capacitance. In terms of units of measure, how is the capacitive reactance of the circuit expressed? #2 AC circuits may develop resistance, inductance, and capacitance. What is the unit of measure used to express inductive reactance? #3 An electrical connection between the wiring of an electric motor and its metal frame is known as what? #4 An accidental path of low resistance which bypasses the intended resistance and passes an abnormal amount of current is known as what? #5 A direct current passing through a wire coiled around a soft iron core is known as what? #6 The device that most commonly utilizes the principle of electromagnetic induction by mutual inductance is what? #7 The number of cycles per second occurring in AC voltage is known as what characteristic? #8 Electric current is the flow of electrons through a conductor. How is the rate of this flow measured? #9 What happens to the current in a series circuit when the voltage remains constant and the resistance increases? #10 Which of the following statements is correct for the illustrated circuit in figure "B"? Illustration EL-0020 #11 Consider a series circuit employing two resistors. What is true about the resistance value of the second resistor compared to the first when the voltage drop across the first resistor is one half the source voltage? #12 What statement is true concerning the total power consumed in a series circuit? #13 What is true concerning all of the connecting conductors of a DC series circuit? #14 Which of the following statements concerning a circuit with parallel connected resistors is correct? #15 Which of the following statements is true concerning circuits with parallel connected resistances? #16 What is statement is true concerning the total resistance of a parallel circuit? #17 What statement is true concerning the electrical diagram shown in figure "B" of the illustration? Illustration EL-0019 #18 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 50 microfarads? Illustration EL-0038 #19 Which of the electrical properties listed will always be the same across each component in a parallel circuit? #20 What will happen to the total circuit resistance when additional parallel circuits are added to a circuit? #21 As shown in figure "A" of the illustration, with the switch closed what statement is true if 'R1' and 'R2' have unequal resistance values? Illustration EL-0019 #22 Four lamps are connected in parallel in a single circuit. If one of the lamp burns out, what will happen to the other lamps? #23 Which statement is true concerning the total power consumed in a parallel circuit? #24 In a conventional AC generator utilizing brushes, direct current from the exciter output is passed through the windings of the main field rotor by what means? #25 Compared to conventional alternators, brushless alternators are designed to operate without the use of what? #26 Which of the following statements is true concerning all rotating-field three-phase alternators? #27 Why are space heaters provided on larger generators? #28 Of the listed factors that influence the amount of RMS voltage induced in the windings of an AC generator operating at a constant 60 Hz frequency, which factor is variable during generator operation? #29 By what means is voltage and current generated by modern revolving field AC generators brought out from the alternator enclosure to the connected switch board? #30 What is the most common type of AC service generator found aboard ship in terms of armature and field types?

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