Table of Contents
BEST IELTS Academic Reading Test 198
IELTS ACADEMIC READING TEST 198 – PASSAGE – 1
IELTS ACADEMIC READING TEST – 198
READING PASSAGE – 1
The Development of Travel Under The Ocean
A. For millennia, humans have been intrigued by what lies beneath the sea* and although submarine travel was attempted from time to time, it did not become commonplace until the middle of last century. Several clever and innovative people had experimented with designs for submersible boats before then. But there was much loss of life and little success.
B. There had long been the use of a primitive diving bell for explorative purposes, but it was as a war machine that the submarine came into its own. The first development in the history of American submarines was a small submersible with a hand-cranked screw-like oar and a crew of one. It had built before the American Revolutionary War (1775—1783) but had adapted for use against the British during this war. Although its pilot twice failed to fasten explosive devices to British ships before losing control of his vessel, he escaped harm.
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C. In 1800, an American inventor, Robert Fulton, designed an underwater machine that he called the Nautilus. Its version brought in features that can still be found in some modem submarines, notably adjustable diving planes for better underwater manoeuvring, dual systems of propulsion, and a compressed air system that allowed it to stay down for about four hours without surfacing?
D. The development of submersible vessels lagged a long way behind the continued progress in the design of surface ships until the American Civil War (1861-1865) when both sides tried out various designs. One of those, called the Hunlcy — named after its financier rather than its inventor, sank twice during training missions with 11 crew members losing their lives including Hunley himself.
Notwithstanding these failures, it had commissioned again in 1864 to attack a ship in Charleston Harbor. A torpedo had used to strike and scuttle the ship – a first in naval history, but the submarine never reappeared, and once again the whole crew perished. Its potential had been recognised, but they still remain the challenge of operating safely under the water.
E. The US Navy could appreciate the strategic benefits of having submarines in its fleet and held a competition to encourage the design and construction of these underwater craft. The inventor, John Holland won the competition. It was his sixth prototype, the Holland, that the navy bought and added to its fleet in 1900.
This submarine was quite different from previous designs. It had propelled by a gasoline engine that turned a propeller while the vessel was on the surface. When it submerged, the engine ran a generator to charge batteries to operate an electric motor. The improved propulsion methods were, unfortunately, highly dangerous. Not only is gasoline flammable and unstable, using it in the restricted environment of a submarine posed quite a hazard for the crewmen. There was another problem, too: the batteries were not only heavy, cumbersome, and inefficient, but they were also extremely volatile.
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F. During the same period as Holland’s efforts were being trialled, a German scientist by the name of Rudolf Diesel created an engine which used a fuel less explosive than gasoline and which could consequently be stored safely. Another advantage was that there was no necessity for an electric spark to ignite the fuel. These safety improvements combined with better fuel economy allowed Diesel engines to power a submarine for longer on the surface; however, batteries had still needed to supply energy for underwater operation.
G. Although diesel-powered submarines were successful and used by the US Navy for almost 50 years, the search for a single power source carried on. It wasn’t long before the concept of nuclear power had realised in Germany and taken up by an American physicist, Ross Gunn. He could envisage its potential in submersibles. A research team was put together to adapt the concept of nuclear power for use in submarines. In effect, modem nuclear submarines have onboard a small nuclear power plant which produces a great amount of energy. This is used to heat water and create steam which drives a huge turbine which turns the propeller.
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H. There has been many adaptations and technological improvements made to submarines over the years, but the shape is basically the same. Obviously, it is a totally enclosed craft, cigar-shaped with narrowed ends. The outer hull is dying the largest part of the died boat and forms the body. The inner hull is designed to resist the considerable water pressure and insulates the crew from the cold.
This is where the crew works, eats, and sleeps. It also contains the engine room and the apparatus that makes clean air and clean water. Between the hulls are the ballast tanks for controlling buoyancy. There is a tall fin-shaped sail that comes up out of the hull. Inside the sail is the conning tower and extending from this to the fore, there is a periscope (through which the captain can see the sea and sky when the submarine is near the surface of the water). Sonar is used for navigation deep below the surface. The other projection from the conning tower is the radio antenna.
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G. Underwater, there are two controls for steering the submarine. The rudder (like a tail fin) controls side-to-side movement, and diving planes influence rise and descent. There are two sets of diving planes: the forward sailplanes and the stem planes, which are located at the back with the rudder and propeller. Advancing technology will undoubtedly result in different shapes and modes of operation, and it is quite possible that, in the future, submarines will be manned by robots or computer technology that communicates information to land bases via satellite.
Questions 1-6
Choose NO MORE THAN THREE WORDS from the text for each answer.
1. What kind of underwater device had used to investigate the ocean before submersible boats had invented?
2. What was the crewman of the first American-built submarine trying to do before his mission failed?
3. What gave the Nautilus the ability to remain submerged for a long time?
4. When was a submarine first used successfully to sink an enemy boat?
5. What new type of propulsion did Holland use on top of the water?
6. For what reason had Diesel’s fuel considered safer than Holland’s?
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Questions 7-13
Label the diagram below.
Choose NO MORE THAN TWO WORDS from the text for each answer.
ANSWERS ARE BELOW
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ANSWERS
1. (A) (PRIMITIVE) DIVING BELL
2. FASTEN EXPLOSIVE DEVICES
3. COMPRESSED AIR ( SYSTEM )
4. TRUE
5. (A) GASOLINE ENGINE / GASOLINE
6. LESS EXPLOSIVE / VOLATILE
7. SAIL PLANES
8. PERISCOPE
9. RADIO ANTENNA
10. RUDDER
11. PROPELLER
12. STERN PLANES
13. OUTER HULL