15 Questions
Describe two methods for remote operation of tank quick closing valves.
Two common methods for remote operation of tank quick closing valves are hydraulic and pneumatic systems.
List four safety features of main air receivers and explain the purpose of each.
Four safety features of main air receivers include safety valves, pressure gauges, pressure switches, and relief valves. Safety valves release excess pressure to prevent over-pressurization.
Explain why centrifugal pumps are not self-priming.
Centrifugal pumps are not self-priming because they rely on fluid being present in the casing to operate. They cannot draw fluid into the suction line on their own.
State three functions of air conditioning in the context of marine engineering.
Three functions of air conditioning in marine engineering are controlling temperature, humidity, and air quality within enclosed spaces.
Explain the importance of clear working methods and stating all formulae in engineering examinations.
Clear working methods and stating all formulae are important in engineering examinations to demonstrate the candidate's understanding of the concepts, allow for partial credit, and ensure transparency in the problem-solving process.
Describe the operating principles of a centrifugal pump with the aid of sketches.
Centrifugal pumps operate based on the principle of utilizing centrifugal force to move fluid. They consist of an impeller that spins and imparts kinetic energy to the fluid, causing it to move through the pump.
State where tank quick closing valves would typically be fitted on a marine vessel.
Tank quick closing valves are typically fitted at the bottom of tanks or compartments to quickly isolate them in case of emergency.
Explain the concept of absolute humidity in air conditioning.
Absolute humidity refers to the actual amount of water vapor present in the air.
Define relative humidity in the context of air conditioning.
Relative humidity is the ratio of the actual amount of water vapor in the air to the maximum amount it can hold at a given temperature.
What is the significance of dew point in air conditioning?
Dew point is the temperature at which air becomes saturated with water vapor and condensation begins.
How can steering be maintained in an electro-hydraulic steering gear if the telemotor system fails?
Steering can be maintained manually by using the emergency steering gear or by directly operating the steering gear mechanism.
In case of total failure of the hydraulic system in electro-hydraulic steering gear, how can steering be achieved?
Steering can be achieved by using the mechanical backup system, which may involve manual operation of the steering gear.
What are the advantages and disadvantages of using white metal for stern bearings?
Advantages: good load-bearing capacity, self-lubricating. Disadvantages: high maintenance, prone to damage.
Explain the term 'single phasing'.
Single phasing refers to a condition in which one of the three phases supplying a motor is lost.
What are the effects on a motor experiencing single phasing?
Effects include overheating, reduced efficiency, and potential damage to the motor windings.
Prepare for the Yacht Small Vessel Second Engineer exam administered by the Scottish Qualifications Authority on behalf of the Maritime and Coastguard Agency. This quiz covers the Auxiliary Equipment part of the exam, with a focus on Worksheet Q4. Make sure to follow guidelines such as using non-programmable calculators and showing all working steps clearly.
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