Lubricating system wrong and mixed

Most of the world’s deep sea trading vessels are powered by:

• High speed four stroke engines

• Steam turbines

• Medium speed 4 stroke engines

• Slow speed two stroke engines

Why is the cross head bearing on two stroke diesel engine is difficult to lubricate?

• Water can get through from the rudder

•   The connecting rod stops adequate lubrication reaching the surfaces

• Oscillating movement prevents a dynamic oil film being formed

• It is very large and heavy

   

  How fast does a slow speed 2 stroke engine go?

• 10-30 rpm

• 500-800 rpm

• 30-50 rpm

•   18-300 rpm

What is the primary fuel source for most deep sea trading vessels?

• Electricity

• Coal

• Diesel

• LNG

At what speed does a medium speed 4 stroke engine typically operate?

• 100-300 rpm

• 500-800 rpm

• 30-50 rpm

• 10-20 rpm

What is the main challenge in lubricating the cross head bearing on a two stroke diesel engine?

• Water ingress from the propeller

• The large size and weight of the bearing

• Oscillating movement preventing proper oil film formation

• Excessive heat generation

What is the primary purpose of the cooling system on a ship's engine?

• Generate electricity

• Regulate fuel consumption

• Remove excess heat from the engine

Which type of cooling system is commonly used in marine applications to cool engine components?

• Air cooling

• Liquid cooling

• Passive cooling

In a jacket water cooling system, what is the primary coolant for the engine?

• Seawater

• Freshwater

• Air

Which cooling system is commonly found in large ocean-going vessels with powerful engines?

• Keel cooling

• Evaporative cooling

• Closed-loop liquid cooling