轮机英语听力与会话口述答案

第一章

口述

1． The engine room is the heart of a ship. It is generally located at the stern near the ship bottom. In the engine room, there are a lot of machinery and systems, such as the main engine, the generater engine, boilers, pumps, the refrigerating system, and the air conditioning system. The main engine, also called the main propulsion plant，is the largest and most important one . The modern improvement of control systems results in machinery space remaining unattended for long periods. That is UMS.

第二章

口述

1. The main difference between the diesel engine and the gasoline engine include: 1) the combustion medium of a diesel engine is diesel oil or fuel oil, while that for a gasoline engine is gas oil. 2) the diesel engine is ignited through compression of hot, high pressure oil/air mixture, but the gasoline engine is ignited by electrical spark plug. 3) for diesel engine, the air and oil is mixed inside the cylinder, while for gasoline engine, they are mixed outside the cylinder.

2. First, I will tell the cadet the importance the engine room. Second, I should introduce the various machinery and systems in the engine room, such as the main engine, the generater engine, boilers, pumps, the refrigerating system, and the air conditioning system. Third, I will show him how to operate the various equipment and devices safely, and introduce as much safety knowledge as I can.

3. same as question No 2.

4. The power of the diesel engine is transmitted to the propeller through the transmission system. The items of transmission system include various shafts, such as the thrust shaft, one or more intermediate shafts and tail shaft. These shafts are supported by the thrust block, intermediate bearings and the sterntube bearing. The propeller consist of a boss with several blades,. The thrust is transmitted along the shafting to the thrust block and finally to ship structure.

5. When the ship is sailing at full speed, it need four engines running . When the ship is sailing at half speed, it require two engines running. While the ship is operating at about 30 % of full speed, one engine is enough to meet its power requiement. That is, the ship can be operated with single engine, double engines, or four engines according the load condition.Generally, when the ship is sailing at sea speed, it has four enginse running,whie it approaches the wharf, it has two.

6. The structure of the main engine is as follows: the construction mainly include bedplate, frame, cylinders, pistons, connecting rod, main bearing and crankshaft. The crankshaft rests in main bearings built into cross girders of the

bedplate. On the top of A frames there is a scavenging air box. The bedplate, frames and cylinder blocks are secured together by long tie-rods. A piston consists of a lower part called piston skirt and an upper part called piston crown.

7. The moving parts shown in the illustration mainly include the piston, the connecting rod, and the crankshaft. These are all critical parts of the engine. According to the specific condition shown in the picture, the piston is under compression force, the connecting rod is under tension stress and compression force, while the crankshaft is under the torsion forces.

8. Pistons can be divided into two main classes: the crosshead type pistons and the trunk type pistons. The top surface of the crosshead piston can be flat, sunken or convex. The piston shown in the illustration is the crosshead type piston with a sunken surface. It has the advantage of increasing the air turbulance and imporvingthe oil/air mixing quality. Its disadvantage is that the cylinder volumetric clearance will be larger.

9. The piston rings shown in the illustration has the shape of rectangle or trapezoid. Some of them are rounded on the external top or bottom edges. Among these piston rings, No.1 and No.2 are sealing rings, No. 3 and No. 4 are scraper rings, while the No.5 is a distributor ring. Generally, each piston is provided with five or six piston rings.

10. Large marine diesel engines of crosshead construction generally have two systems of lubrication: a totally loss system feeding the cylinders and a

circulating system lubricating the running gear and cooling the pistons. Oil is supplied to the cylinder liner wall and piston rings by means of mechanical lubricators. The lube oil to the varoius moving parts enable the formation of an oil film which reduces friction and wear.

三．A

1 In order to ensure the safe navigation of the ship, frequent communication between the engineers and officers is necessary. The usual means of communication is by telephone and telegraph. If the communication between the engine room and the bridge fails, the ship will be endangered. The records of communication should be maintained which will provide evidence in the event of an accident at sea. Noon report is also a good means of communication between the engine room and the bridge.

4 At the completion of the watch, each member of watchkeeping should hand over to his relief, ensuring that the relief is competent to take over and carry out his duties effectively. Before going off duty, the engineer in charge of the watch shall ensure that all events related to the main and auxiliary machinery are suitalby recorded. He should tell the relieving engineer the standing orders , special intructions and unfinished work, if any. If he has any reason to believe that the relieving engineer is not capable of carrying out the watchkeeping duties effectively, he shall not hand over the watch and the chief engineer shall be notified.

四

1 Last year when I worked on a bulk carrier, I found the exhaust temperature of the main engine is rising quickly. There was a fire in the scavenge air box. The engine was slowed down. The fuel was shut off from the affected cylinders. I opened wide the inlet valve of the cooling water. The duty motorman increased the cylinder lubrication. The fire quickly burnt out.

2 In the event of sudden stoppage of the main engine, the possible cause may be the safety protection system functioning, due to low lube oil pressure, fuel oil breakdown, blackout, overspeed and so on. Generally, we should take the following actions: first, we will carefully examine the main engine and find the causes. Second, we will take measures to remedy the trouble. Third, we will reset and restart the main engine.

3 If the turbocharger surges, the possible causes include high back pressure of exhaust manifold and low flowing quantity, rapid change in load, insufficient fuel oil, bad combustion, scavenge fire and so on. In the event of turbocharger surge, we will slow down the main engine, find the causes, and do some remedies.

8 When we start the emergency generator, we should take the following steps. First, check the lube oil and fuel oil levels, as well as the water level. Second, the selecting switch will change over from “automatic ” to “manual”. Third, push the starting button, and check the voltage and frequency.

9 The maintennace work of emergency battery include: 1) check the electrolyte level. 2) keep the emergency battery clean. 3) measure the voltage of the battery. 4) measure the specific gravity of the electrolyte. 5) periodically charge and discharge the battery so as to protect the plate electrode.

11 Fire is a constant hazard at sea. It is the result of a combination of three

factors, namely, inflammable material, hot spot, and oxygen. According to the material involved, fires can be divided into four classes:. For example, burning light metals will be classified as Class D, burning electric equipment classified as Class C, burning oils is Class B, and burning wood, Class A.

17 In the event of collision, the bridge will inform the captain and the

engine room immediately. The bridge should tell the engine room the striking position, damage extent and so on. The engine room should take measures accordingly. In case of engine room flooding, the engine room personnel should report to the bridge, and take actions according to the muster list.

20 The muster list is an important document on board. It tells the crew

members their position and duties in emergency situations, such as fire, collision, oil spill, abandoning ship, ship grounding and so on. For example, in case of flooding, the chief engineer should go to the engine room and be in general command.The second engineer should maneuver the main engine. Some other members should go to stop the flooding and so on.

21 Once a container ship collided with a bulk carrier. The captain of the

container ship decided to abandon the ship since it was in danger of sinking. The engine room personnel stopped the engine, cut off the electric supply, closed the ventilators, released the compressed air and steam. The chief engineer collected the important documents and all engine room staff evacuated from the engine room.

23 The maintenance work of the lifeboat engine mainly include: 1) check

the various oil levels and water levels. 2) start the lifeboat engine once every week, make it run for about five minutes. 3) protect the engine from freezing with anti-freezing fluid.

24 SOPEP stands for Shipboard Oil Pollution Emergency Plan.Its main

contents include the person to be contacted in case of oil spill, his contacting methods such as phone number and adress, the procedure to be adopted in case of oil spill, such as the disposal methods, anti-pollution equipment and materials.

25 The materials used for oil spillage mainly include the following: 1) the

material used for cleaning up spilled oil, for example, the oil absorbent such as saw dust and oil felt.2)The material for preventing split oil from spreading out, such as oil booms. Oil dispersent is seldom used since it must get the approval from the port administration and may cause secondary pollution.

27 In the event of a man falling overboard, the person who see the accident

must shout for help, inform the bridge, throw a lifebuoy into the water and keep the man in his visual scope. The bridge should sound the alarm, and take measures

to save the man, for example, slowing down, changing the direction, and lowering the lifeboat to pick up the man falling overboard.

28 First aid is emergency care for a victim of sudden illness or injury until

more skillful medical treatment is available. The usual actions taken in the first aid include artificial breathing, stopping bleeding with bandage and so on. Once I saw a sailor who had his hand injured during the firefighting drill. I immediately help him stop the bleeding with the medicine and the bandage.

五

2 When selecting the fuel oil, there are many factors to consider, such as viscosity, cetane number, calorific value and so on. Before bunkering, the engine room personnel should make the bunkering plan and other necessary preparations . The third engineer will go to the oil lighter to measure the content of all the oil tanks. During bunkering, the engine department and deck department should work cooperatively. After bunkering, the crew will flush the oil retained in the hoses with compressed air and calculate the volume of oil received.

4 Before repair, the engine room personnel have a lot of work to do.They should confirm which items in their charge are to be repaired. They will prepare the necessary spare parts and special tools. Then the second engineer will collect all the information about the repair items. After being verified by the chief engineer and signed by the captain, the repair list will be submited to the company for approval.

7 As a chief engineer, if I want to receive a new ship, I will take the following items into consideration. First, check the list of engine room equipment and machinery, as well as the list of stores and spare parts. Second, test all the devices in the engine room. Third, conduct the sea trial, collect and submit all the items of non-conformity to the company.