Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Marine Electrical Systems (Set 10)
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Question 1 of 30
In a series wound motor, the current passing through the field windings also passes through what component?
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30 MCQs #1 In a series wound motor, the current passing through the field windings also passes through what component? #2 How is the speed of a series wound winch motor controlled? #3 What type of DC motor is never connected to a belt driven load? #4 As load is added to a DC shunt motor, how will the motor respond? #5 Which of the following types of DC motors has its field connected in parallel with its armature? #6 In a short-shunt cumulatively compound-wound DC motor, how is the shunt field connected? #7 If an unloaded DC compound motor's shunt field were weakened by excessive rheostat resistance or by an open circuit, how would the motor respond? #8 What is the recommended method used to resurface an eccentric DC motor commutator? #9 In general, what can cause D.C. propulsion motor brush sparking to be excessive? #10 What should be included in performing proper maintenance of a D.C. motor's commutator? #11 Which of the listed faults can only be eliminated by turning or grinding the face of a commutator with a rigidly supported tool? #12 For routine cleaning of a commutator, what should be applied? #13 What is an important factor in minimizing D.C. motor commutator wear? #14 In addition to improper brush pressure or seating, what can result in excessive sparking at the brushes of a DC propulsion motor? #15 How can a shorted armature coil in a DC motor be detected? #16 Which of the listed conditions could cause a recently overhauled DC motor to have excessively hot windings and sparking at the brushes? #17 An open in the armature of a DC motor is suspected, but is not found by visual inspection of the commutator. What would be the next step in troubleshooting this problem? #18 If a DC motor runs faster than designed, with all other conditions being normal, what could be the possible cause? #19 Besides for checking for circuit continuity, what can an ohmmeter be used for in diagnosing a DC motor? #20 One method of testing for a reversed shunt field coil in a DC motor is by connecting the coil to a low voltage source, and testing for polarity. How is this done? #21 How may temporary repairs to an open DC propulsion armature coil be made, allowing continued operation until permanent repairs can be made? #22 What would excessive sparking at the brushes of a running DC motor be an indication of? #23 Besides a condition of overload, what could be a cause of an open armature connection in a DC propulsion motor? #24 Which figure represents the schematic symbol shown in figure "2"? Illustration EL-0034 #25 As shown in figure "6" of the illustration, what does the symbol represent as used in electrical drawings? Illustration EL-0026 #26 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? Illustration EL-0011 #27 Which of the electronic schematic symbols represents the capacitor illustrated in figure 2 of the illustration? Illustration EL-0015 #28 Which of the listed figures in the illustration represents a transformer configured for single voltage primary and a tapped secondary? Illustration EL-0055 #29 Which of the illustrated resistors represents the schematic symbol shown in figure "C"? Illustration EL-0021 #30 What is the shape of the schematic symbol for an operational amplifier used in an analog circuit?
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