Marine Engineering Systems

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Questions and Answers

What is the primary function of a transformer in a ship's electrical system?

To transfer electric energy between circuits (correct)

To reduce the current in a circuit

To increase the voltage of a generator

To convert DC to AC power

What is the purpose of the MAIN ENGINE REMOTE CONTROL SYSTEM?

To control the generator's output voltage

To control the main engine from a remote location (correct)

To synchronize multiple generators

To monitor the lube oil temperature

What is the minimum lube oil temperature required before connecting to the main switchboard?

100° F

80° F

110° F

90° F (correct)

What is the primary purpose of the cooling water system in a main engine?

To remove heat from the engine and prevent overheating Signup and view all the answers

What is the purpose of load monitoring and management systems?

To control when a load is added or shed from a power system Signup and view all the answers

What is the ideal temperature for the lubrication system's oil?

At the right temperature and pressure Signup and view all the answers

What is the purpose of air blowing in an engine?

To release any moisture or residues inside the cylinders Signup and view all the answers

What can occur when a generator is operated at low loads?

Reduced efficiency, overcooling, and accumulation of moisture Signup and view all the answers

What is the purpose of a boiler in a ship's electrical system?

To produce steam for propulsion Signup and view all the answers

What is the recommended temperature for fresh water cooling before and after the engine?

80°C - 90°C Signup and view all the answers

What is the purpose of the starting air system?

To provide compressed air for combustion Signup and view all the answers

What can occur when a generator is operated at high loads?

Damage to internal components and costly repairs Signup and view all the answers

What is the purpose of ACB in ship electrical systems?

To provide overcurrent and short-circuit protection Signup and view all the answers

What is the temperature of fuel (HFO) in the service tank?

95°C Signup and view all the answers

What is the temperature for the M/E circulation freshwater stop/standby?

55 DEG. Signup and view all the answers

What is the purpose of the fuel system in a main engine?

To deliver fuel to the engine cylinders Signup and view all the answers

What is the primary function of a Boiler Safety Relief Valve?

To regulate pressure levels in the system Signup and view all the answers

What is the purpose of blowing down the water level gauge?

To control boiler water parameters within prescribed limits Signup and view all the answers

What is the function of a Feed Water Pump?

To pump feedwater into a steam boiler Signup and view all the answers

What is the purpose of an Econimozier?

To remove heat from the flue gas and add it to the incoming feed water Signup and view all the answers

What is the primary cause of corrosion in boilers?

Water analysis showing high chloride levels Signup and view all the answers

What is the purpose of a Stop Valve / Main Steam Valve?

To connect the boiler steam system to the steam main/header Signup and view all the answers

What is the purpose of Purging?

To remove any gases present in the furnace by forcing it out through the funnel Signup and view all the answers

What is the primary function of a Boiler Flame Eye?

To detect when the burner is firing or not Signup and view all the answers

Study Notes

Turning Gear Motor

A reversible electric motor that can be used to turn slowly a large diesel engine or steam turbine and gearbox assembly

Main Engine Remote Control System

A system to control an engine installed in a vessel from an operating panel in the wheelhouse

Generator

Output voltage of generators on ships with very large electrical loads can be 3.3 kV, 6.6 kV, and 11 kV
Generators can be operated at low loads, but this can lead to negative consequences such as reduced efficiency, overcooling, and accumulation of moisture and condensation

Transformers

Devices that transfer electric energy from one alternating-current circuit to one or more other circuits, either increasing or reducing the voltage

Engine Sump Tank

No additional information provided

Manual and Remote Starting Procedures

Lube oil temperature must be at least 90°F before connecting to the main switchboard

Load Monitoring and Management

System allows users to control when a load is added or shed from a power system
Prevents too many high-current loads from operating at the same time

ACB

Used in ship electrical systems for their capability to provide both overcurrent and short-circuit protection, as well as additional features like adjustable trip settings and communication capabilities

Boiler Safety

Boiler safety relief valve is a critical safety component that helps regulate pressure levels in the system
Boiler flame eye is a photocell operated flame sensor that detects whether the burner is firing or not
Deaerator valve is a device that removes dissolved gases like oxygen from a liquid
Boiler control system is a set of devices and software that monitors and regulates the operation of a boiler

Boiler Operations

Purging will remove any gases present in the furnace by forcing it out through the funnel
Stop valve/main steam valve connects the boiler steam system to the steam main/header
Blowing down the water level gauge is used to control boiler water parameters within prescribed limits to minimize scale, corrosion, carryover, and other specific problems
Feed water pump is a specific type of pump used to pump feedwater into a steam boiler

Boiler Instruments

Pressure gauge is usually located on the front of the boiler and has a green and red section that can be used to detect when the pressure is too low, too high, or just right

Exhaust Stack and Economizer

Exhaust stack is the piping that conveys the hot combustion gases away from the boiler to the outside
Economizer is a heat transfer product that removes heat from the flue gas and adds it to the incoming feed water

Corrosion and Water Analysis

Causes of corrosion include water analysis factors such as chloride, pH level, and alkalinity

Main Engine Components

Cascade tank, hot well, feed water tank, and condensate tank are all components of the main engine system
Main engine is any internal combustion, compression-ignition engine that is configured to supply propulsion power for an ocean-going vessel

Cooling and Starting Systems

Cooling water system removes heat from the engine and prevents it from overheating
Starting air system provides compressed air to the engine cylinders to initiate the combustion process
Fuel oil system delivers the fuel from the storage tanks to the engine cylinders, where it is injected and burned to produce power
Lubrication system circulates oil throughout the engine to reduce friction and wear between the moving parts

Engine Temperatures and Preparations

Fresh water cooling temperature before engine: 80°C (176°F) - 90°C
Inbound and outbound cooling temperatures are not specified
Temperature of fuel (HFO) in the service tank: 95°C
Air blowing is carried out to release any moisture or other residues inside the cylinders
Preparation of M/E before departure includes checking the M/E circ. fresh water temp stop/standby at 55°C

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Description

This quiz covers various systems used in marine engineering, including turning gear motors, main engine remote control systems, and generators. It explores the components and functions of these systems in vessels.