ΚΕΣΕΝ Μηχανικών flashcards
ΚΕΣΕΝ Μηχανικών · Build recall with a focused review session.
30 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Mean indicated pressure
- The effective average pressure representing indicated work over the relevant cycle, distinct from the highest cylinder pressure on a diagram.
- Brake power
- The useful shaft power under the stated operating basis, distinguished from indicated cylinder power and the total fuel-energy input.
- Specific fuel consumption
- Fuel mass divided by useful energy output over a defined interval, requiring compatible units and comparable operating conditions.
- Compressor surge
- An aerodynamic instability involving relevant flow and pressure behavior, which must not be inferred solely from any unexplained engine-room noise.
- Cavitation
- Formation and collapse of vapor cavities when local liquid pressure falls below the relevant vapor pressure under the actual conditions.
- Pump similarity model
- A bounded relationship among flow, head, power and speed that requires stated assumptions and does not replace the real system curve.
- Isenthalpic throttling
- An idealized expansion process preserving specific enthalpy, distinct from constant temperature or an absence of pressure change.
- Conductivity indication
- A measurement related to ionic content under the actual calibration, which is not a complete assessment of every freshwater quality property.
- Displacement
- The vessel weight supported by displaced water under the stated floating and water-density conditions, distinguished from a geometric volume alone.
- Metacentric height
- An initial-stability quantity under the relevant model, whose positivity does not establish every intact or damage-stability requirement.
- Free-surface correction
- A modelled reduction in effective initial stability caused by liquid movement in a slack tank, interpreted with actual geometry and assumptions.
- Hogging
- A hull-girder bending condition with an upward-arching form and corresponding deck tension and bottom compression under the simplified beam model.
- Certificate pathway
- The actual combination of education, service, assessment and authority requirements for a specified national maritime role rather than a generic quiz score.
- Critical equipment
- Equipment or technical systems whose sudden failure can create a hazardous situation and therefore require appropriate reliability measures and evidence.
- Engineering handover
- Communication of the actual machinery state, defects, ongoing work and limitations so the next watch does not rely on unsupported assumptions.
- Safety management evidence
- Records and demonstrated arrangements supporting safe operation and pollution prevention, rather than a document name or a retrospectively completed checkbox.
- Live-zero signal
- A measurement range whose normal zero-value output is above zero electrical signal, allowing some abnormal observations to be distinguished without uniquely diagnosing their cause.
- Feedback error
- The signed difference between the stated reference and measured value, whose interpretation requires the actual loop convention and operating context.
- Sensor range
- The specified interval over which a sensor is intended to measure, distinct from its resolution, accuracy and allowed operating environment.
- PLC input state
- The value presented to the controller by its configured input channel, which may differ from a local process-gauge observation and requires appropriate diagnosis.
- Work sign convention
- An explicit definition of whether positive work is done by or on the system, which must be used consistently in the chosen energy balance.
- Ideal-gas temperature
- Absolute temperature in kelvin used in the stated ideal-gas relationship, rather than inserting an arbitrary Celsius reading into a proportional gas equation.
- Specific heat capacity
- Energy required per unit mass per unit temperature change under the specified process conditions, distinct from a latent heat for phase change.
- Isothermal process
- A process at constant temperature, which gives unchanged internal energy for a fixed amount of the stated ideal gas but not necessarily zero work.
- Adiabatic process
- A process with no heat transfer across the defined boundary, which does not automatically mean constant temperature or absence of work.
- Observed symptom
- A documented change in performance or condition that can motivate investigation but does not alone establish the unique failed component or root cause.
- Condition-based task
- A maintenance action triggered by relevant observed equipment condition under appropriate assessment criteria, rather than simply by elapsed calendar time.
- Root-cause hypothesis
- A proposed explanation for the failure mechanism that must be tested against suitable evidence, not established merely by replacing a named part.
- Controlled restoration
- An authorized return-to-service process including the relevant protective functions, functional checks, records and handover under actual equipment and site requirements.
- Mean repair duration
- A defined average of relevant active repair time divided by the counted repairs, which must not be confused with every elapsed outage or logistical delay.