Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Marine Electrical Systems (Set 38)
30:00
|Question 1 of 30
Question Navigator
Correct Incorrect Pending Starred
Question 1 of 30
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
Browse Questions in Set 38
30 MCQs #1 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 #2 What will be the resulting total current if a voltage of 125 VDC is applied to the loads of the circuit in figure "A" of the illustration where the resistance of R1 is 12 ohms, and R2 is 115 ohms? EL-0019 #3 As shown in figure "B" of the illustration, if the source voltage at the branch circuit breaker is 220 VAC, what would be the applied voltage to the load? EL-0083 #4 The turns ratio of the step down transformer with dual voltage secondary shown in figure "B" of the illustration is two to one (total). If 220 volts were applied to terminals 'H1' and 'H2', what would be measured across 'X3' and 'X4'? EL-0082 #5 What is the maximum current allowed to be drawn from the secondary of a 2 kVA step- down transformer with a turns ratio of four to one if connected across a 440 volt line? #6 A 440/110 V single phase transformer supplies a load of 5 kW at 0.8 power factor load. What will be its primary current? #7 A 440/110 V single phase transformer supplies a load of 5 kW at 0.8 power factor load. What will be its secondary current ignoring transformer power losses? #8 An AC motor is started and produces 25 horsepower when running at rated speed and load. Neglecting power factor considerations, how much will the kW meter reading increase for the sole generator providing power? #9 The apparent power supplied to a motor is six kilovoltamps at 120 volts. What is the impedance of the motor? #10 An electrical component is connected across a 120 volt 60 hertz AC supply. What is the current drawn by the component if the impedance is 200 ohms? #11 If a 6-pole motor is supplied at 60 Hz and runs with a slip of 5%, what is the actual rotor speed? SB0081 #12 If the values of C1 and R1 shown in the illustration were 1 microfarad and 3 megohms respectively, which of the listed intervals of time would equal one 'time constant'? EL-0086 #13 What will be the resulting current when a voltage of 12 VDC is applied to a capacitance of 470 microfarads in figure "C" of the illustrated circuit after the capacitor has had ample time to fully charge? EL-0018 #14 What does the symbol labeled "OL" represent as shown in the power circuit on lines T1 and T3 to the motor as shown in figure "A" of the illustration? EL-0011 #15 Which figure represents the schematic symbol shown in figure "2"? EL-0034 #16 As shown in the illustrated devices and symbols, which of the symbols represents a standard normally closed relay contact? EL-0005 #17 In electrical circuit schematics, a normally open pressure switch is represented by which of the symbols shown in the illustration? EL-0059 #18 0. Which of the electronic schematic symbols represents the capacitor illustrated in figure 1 of the illustration? EL-0015 #19 As shown in figure "6" of the illustration, what does the symbol represent as used in electrical drawings? EL-0026 #20 The clamp-on AC ammeter consists essentially of a split-core and a rectifier-type instrument connected to the secondary winding of a particular type of transformer. Which type is used? #21 To properly use a clamp-on-type ammeter to check current flow, what must be done FIRST? #22 How should the shunt used in an ammeter be connected? #23 Why are external shunts sometimes used with ammeters? #24 What is an ammeter used to measure? #25 When a resistor is used as a shunt and is connected in parallel with a meter movement coil, what capability does this provide? #26 Which of the following electric meter movements uses a stationary permanent magnet and movable coil? #27 To limit the current flow through a DC voltmeter to as low a value as possible, what is the moving coil circuit provided with? #28 What is the instrument called a galvanometer used to measure? #29 How is a wattmeter electrically connected in a circuit? #30 In testing a hand cranked megger prior to use, what statement is true?
Question Discussion & Notes
0Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.
Loading mariner discussions...