COMPETENCE 7 – Maintenance and Repair of Electronics and Electrical Equipment
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#1. A thermal-magnetic circuit breaker for a 300 KW alternator is rated at 500 amperes at full continuous load. Which of the following conditions will trip the breaker?
Incorrect!
#2. According to 46 CFR, Subchapter J(Electrical Engineering), the type of control circuit logic associated with auxiliaries vital to the operation of propulsion equipment, where automatic restart after a voltage failure would not create a hazard, is termed what?
Incorrect!
#3. An electrical connection between the wiring of an electric motor and its metal frame is known as what?
Incorrect!
#4. An accidental ground in a motor can be defined as an electrical connection between the wiring of the motor and what other aspect of the motor installation?
Incorrect!
#5. A main switchboard for an AC electrical distribution system is different from a main switchboard for a DC distribution system in that it will be provided with which of the following meters?
Incorrect!
#6. A single-phase capacitor-start induction motor starts, comes up to about 75% rated speed, slows down to a lower speed, and accelerates again. Where is the problem most likely to be?
Incorrect!
#7. An accidental path of low resistance which by passes the intended resistance and passes an abnormal amount of current is known as what?
Incorrect!
#8. According to the 46 CFR, Subchapter J (Electrical Engineering) requires which of the listed features to open the power circuit to a motor due to low voltage and re-close automatically when the voltage is restored to normal?
Incorrect!
#9. 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?
Incorrect!
#10. Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured?
Incorrect!
#11. An accidental path of low resistance by passing the intended path and allowing passage of an abnormally high amount of current is known as what?
Incorrect!
#12. An AC generator produces 60 Hz at1800 RPM. If the generator speed is increased to 1830 RPM, what will happen to the frequency in Hz?
Incorrect!
#13. A voltage amplifier has a calculated voltage gain of 10. Which statement correctly states the gain?
Incorrect!
#14. An AC generator operating in parallel loses its excitation without tripping the circuit breaker. What will be the result?
Incorrect!
#15. A single-phase split-phase induction motor will only start if you spin the rotor rapidly with the line switch closed. After starting, its speed fluctuates between very slow and half-speed. What motor component most likely is faulty?
Incorrect!
There are 15 questions for the actual examination for Competence 7 for OIC-EW with a passing rate of 70%. This means that you are only allowed to make 4 mistakes.
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