OIC-EW MARINA REVIEWER / QUIZ COMPETENCE 7 - PART 6 - Seaman Kowts

COMPETENCE 7 – Maintenance and Repair of Electronics and Electrical Equipment

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#1. In an impressed current cathodic protection system, concerning the anodes associated with the hull, what statement is true?

The anodes are insulated from the hull and do not waste away with time.

The anodes are connected to the hull and waste away with time.

The anodes are connected to the hull and do not waste away with time.

The anodes are insulated from the hull and waste away with time.

Incorrect!

#2. In a single element cartridge-type fuse, what type of protection is provided for lighting and general power applications?

sustained overload protection using a fusible link

sustained overload protection using a spring loaded soldered joint

short-circuit protection using a fusible link

short-circuit protection using a spring loaded soldered joint

Incorrect!

#3. In a short-shunt cumulatively compound wound DC motor, how is the shunt field connected?

in parallel with the armature and series field

in parallel with the armature

in series with the armature

in series with the armature and series field

Incorrect!

#4. If the voltage and the current developed in an AC circuit reach their peak values at the same time (with a phase angle difference of zero), what is the power factor considered to be?

lagging

leading

unity (1.0)

infinity

Incorrect!

#5. If the field current of a paralleled AC generator is increased above normal, what will be the net result to the VAR’s and power factor?

VAR’s will decrease and the power factor will be more leading

VAR’s will increase and the power factor will be more leading

VAR’s will decrease and the power factor will be more lagging

VAR’s will increase and the power factor will be more lagging

Incorrect!

#6. In a three-phase, wye-wye connected transformer, what is the relationship between line current and phase current?

the line current is equal to the phase current

the line current is three times the phase current

the line current is equal to the sum of any two phase currents

the line current is equal to the difference of any two phase currents

Incorrect!

#7. In an alternating current circuit, what factor of a circuit will cause the inductive reactance to vary?

resistance of the circuit

frequency of the circuit

voltage of the circuit

current of the circuit

Incorrect!

#8. In a rectified DC diesel electric plant, raising the AC generator’s field excitation current will have what effect on the DC propulsion motor?

increase in speed

decrease in speed

operate with a lower power factor

operate with a higher power factor

Incorrect!

#9. If you hear a loud buzzing noise coming from a magnetic motor controller, what should you do?

assume that the motor is operating at a full load

assume that the controller is operating normally

notify the electrician or watch engineer of the problem

feel the outside of the casing with your hand to see if it is hot

Incorrect!

#10. In a logic circuit, what statement is true concerning how the NOR and NAND logic gates function?

Both the NOR and NAND logic gates must be used together in a logic circuit and cannot be used individually.

Given the same inputs, the NOR and NAND logic gates are the opposite of each other in terms of outputs.

Given the same inputs, the NOR logic gate has the opposite output from the OR logic gate and similarly the NAND logic gate has the opposite output from the AND logic gate.

The NOR and NAND logic gates can be used interchangeably.

Incorrect!

#11. If the field excitation is increased to one of two alternators operating in parallel and decreased on the other, what will be the result on the alternator with the field excitation increased?

the power factor will change in the lagging direction

the power factor will change in the leading direction

the kilowatt load will be greatly increased

the ampere load will be greatly decreased

Incorrect!

#12. In the flow of one cycle of single phase alternating current past any given point in a circuit, how many times will the current peak to a maximum?

one time

three times

four times

two times

Incorrect!

#13. In general, why are nickel-cadmium storage batteries superior to lead-acid batteries?

they put out higher voltages and require no maintenance

they can remain idle and keep a full charge for a long time

they need fewer cells in series and use less mounting space

they are less costly to replace

Incorrect!

#14. In addition to testing the calibration of a circuit breaker, what additional maintenance should be routinely performed?

changing out of magnetic elements yearly as appropriate

changing out of bimetallic elements yearly as appropriate

performing an external visual inspection

complete disassembly to perform an internal inspection

Incorrect!

#15. In a shunt-wound DC generator, with what generator component are the shunt field windings connected in parallel with?

the interpoles

the compensating windings

the armature circuit

the series field winding

Incorrect!

#16. In a series circuit what is the total applied voltage equal to?

the sum of the individual voltage drops

the total resistance divided by the total current

the sum of the individual currents multiplied by the number of resistors

the total current divided by the total resistance

#17. In a logic circuit, how does a NOT gate function?

it does not alter the input logic condition

it serves to amplify a given signal level

it serves to attenuate a given signal level

it reverses the input logic condition

Incorrect!

#18. Impressed current cathodic hull protection systems are commonly used on modern vessels. What are these systems designed to replace or reduce?

electroplating of the hull

repeated painting of the hull

vacuum tube degaussing systems

sacrificial zinc anodes

Incorrect!

#19. In a basic AC induction motor, by what means are rotor currents induced in the rotor?

a bridge rectifier

an armature and brushes

external variable resistors

magnetically by the rotating stator field

Incorrect!

#20. In a dual element time-delay cartridge-type fuse, what type of protection is provided for motor applications?

short-circuit protection using a fusible link AND sustained overload protection using a spring loaded soldered joint

short-circuit protection using a fusible link only

sustained overload protection using a spring loaded soldered joint only

short-circuit protection using a spring loaded soldered joint AND sustained overload protection using a fusible link

Incorrect!

#21. In a diesel electric plant, raising the generator’s field excitation current will have what effect on the DC propulsion motor speed?

increase in speed

decrease in speed

affect generator speed only

affect main motor speed if done in conjunction with higher generator engine speeds

Incorrect!

#22. In an inductive-resistive circuit, what is the unit of measure for power associated with just the inductive aspects of the load?

kilovolt amps (kVA)

kilovolts (kV)

kilovolt amps reactive (kVAR)

kilowatts (kW)

Incorrect!

Finish

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.

DISCLAIMER

The questionnaires contained in this “reviewer” are extracted from the post released by MARINA on their official website and other review materials. Please note that Seaman Kowts is not affiliated with, endorsed by, or connected to the official website of MARINA. The information provided on this website is for general informational and educational purposes only and should not be relied upon as official or authoritative. If you require official information or services, please visit the official website or any relevant review center. We do not assume any responsibility or liability for any consequences resulting from the use of information or services provided on this website.

Results

#1. In an impressed current cathodic protection system, concerning the anodes associated with the hull, what statement is true?

#2. In a single element cartridge-type fuse, what type of protection is provided for lighting and general power applications?

#3. In a short-shunt cumulatively compound wound DC motor, how is the shunt field connected?

#4. If the voltage and the current developed in an AC circuit reach their peak values at the same time (with a phase angle difference of zero), what is the power factor considered to be?

#5. If the field current of a paralleled AC generator is increased above normal, what will be the net result to the VAR’s and power factor?

#6. In a three-phase, wye-wye connected transformer, what is the relationship between line current and phase current?

#7. In an alternating current circuit, what factor of a circuit will cause the inductive reactance to vary?

#8. In a rectified DC diesel electric plant, raising the AC generator’s field excitation current will have what effect on the DC propulsion motor?

#9. If you hear a loud buzzing noise coming from a magnetic motor controller, what should you do?

#10. In a logic circuit, what statement is true concerning how the NOR and NAND logic gates function?

#11. If the field excitation is increased to one of two alternators operating in parallel and decreased on the other, what will be the result on the alternator with the field excitation increased?

#12. In the flow of one cycle of single phase alternating current past any given point in a circuit, how many times will the current peak to a maximum?

#13. In general, why are nickel-cadmium storage batteries superior to lead-acid batteries?

#14. In addition to testing the calibration of a circuit breaker, what additional maintenance should be routinely performed?

#15. In a shunt-wound DC generator, with what generator component are the shunt field windings connected in parallel with?

#16. In a series circuit what is the total applied voltage equal to?

#17. In a logic circuit, how does a NOT gate function?

#18. Impressed current cathodic hull protection systems are commonly used on modern vessels. What are these systems designed to replace or reduce?

#19. In a basic AC induction motor, by what means are rotor currents induced in the rotor?

#20. In a dual element time-delay cartridge-type fuse, what type of protection is provided for motor applications?

#21. In a diesel electric plant, raising the generator’s field excitation current will have what effect on the DC propulsion motor speed?

#22. In an inductive-resistive circuit, what is the unit of measure for power associated with just the inductive aspects of the load?

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