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OIC-EW MARINA REVIEWER / QUIZ COMPETENCE 7 – PART 4

22 March, 2023
REVIEWER

COMPETENCE 7 – Maintenance and Repair of Electronics and Electrical Equipment

Results

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The breaker cannot be reset to the ON position until the thermal element cools down.

The breaker handle will lock in the OFF position.

The breaker handle will lock in the TRIPPED position.

The thermal element must be replaced after an overload trip has occurred before it can be restored into service.

Incorrect!

the speed of the engine driving the alternator

the resistance applied to the field rheostat

the synchronous speed of induction

the adjustments made to the voltage regulator

Incorrect!

one cell

three cells

six cells

twelve cells

Incorrect!

It will remain unchanged

It will decrease by approximately 3%.

It will become variable.

It will increase.

Incorrect!

adding rubber insulation conductors to the circuit

using higher current and lower voltage

increasing the number of thermal relays in the circuit

using higher voltage and lower current

Incorrect!

One

Two

Three

Four

Incorrect!

#7. How is the speed of the propeller shaft directly coupled to an AC synchronous drive motor changed when powered by either a dedicated or integrated constant frequency alternator in an AC diesel-electric drive system?

Varying the generator speed

Varying the number of motor poles

Varying the field strength of the generator

Varying the output frequency of the power converter

Incorrect!

relative speed of the rotating magnets

number of turns of wire in the armature coil

strength of the magnets used

output voltage

Incorrect!

varying the prime mover speed

varying the load on the alternator

varying the strength of the excitation field

varying the number of poles

Incorrect!

the connected load

prime mover speed

the ground current

the generator’s rated voltage

Incorrect!

in series with the load and in parallel with the meter movement

in parallel with the load and in series with the meter movement

in parallel with the load and in parallel with the meter movement

in series with the load and in series with the meter movement

Incorrect!

in series with a circuit

in parallel with a circuit

without regard to polarity

Incorrect!

in series with the series windings

in parallel with the field rheostat

in series with the armature windings

in parallel with the armature windings

Incorrect!

average temperature at any given latitude

average temperature rise due to resistance at 10% overload

normal temperature rise above the standard ambient temperature at rated load

permissible difference in the ambient temperature of the motor due to existing weather conditions

Incorrect!

minimum torque developed by the motor accelerating from rest to the speed at which breakdown torque occurs

torque developed by the motor operating at rated horsepower, speed, and frequency

maximum torque developed by an overloaded motor with rated voltage and frequency with appreciable drop in speed

torque developed by the motor at the instant voltage is applied to the motor at startup

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.

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OIC-EW MARINA REVIEWER / QUIZ COMPETENCE 7 – PART 4

Results

#1. How will a molded-case circuit breaker with a thermal trip unit react immediately after it has tripped, as a result of an overloaded motor circuit?

#2. How are the number of cycles per second developed by the alternator aboard your vessel determined?

#3. How many cells are within a twelve volt lead acid battery?

#4. How will the value of the output frequency change if the load is removed from a turbo generator having a governor speed droop setting of 3%?

#5. How are the line losses in a distribution circuit kept to a minimum?

#6. How many possible states does a binary logic circuit have?

#7. How is the speed of the propeller shaft directly coupled to an AC synchronous drive motor changed when powered by either a dedicated or integrated constant frequency alternator in an AC diesel-electric drive system?

#8. How is the frequency output of an operating alternator controlled?

#9. How is the output voltage of a 440 volt, 60 hertz, AC generator controlled?

#10. How is the power factor of an AC generator operating singularly determined?

#11. How should the shunt of a DC ammeter be connected?

#12. How would a DC ammeter designed to directly measure current be connected?

#13. How are the field windings of a DC shunt generator connected?

#14. How is the rated temperature rise of an electric motor defined?

#15. How is the full-load (rated) torque of an induction motor defined?