Diesel engines - Marvel EDU

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Practice Listening: Multiple Choice, Multiple Answers ID: #34098 Medium Diesel engines

Instructions ›

Listen to the recording and answer the question by selecting all the correct responses. You will need to select more than one response.

Transcript:

Diesel engines had to develop engineering interest the hard way. The diesel engine appeared to offer little or nothing as a vehicle power plant in 1909, but it was worth watching at the time because of its high thermal efficiency. The threat of a gasoline shortage in 1917 and 1918 caused more attention to be paid to the diesel, and it became the subject of numerous technical papers. Kleiber Motor Company experimented with diesel-powered trucks in 1929. The engine type known as the diesel had, for many generations, been the dream of engineers. While man had developed mechanical power which was extremely useful, it was seriously inefficient. The steam engine of James Watt, in the late 1700s, was a commercial success; yet it wasted 90 percent of the energy in the fuel. Something far better was needed. Through the 1800s, many engines were built that ran on various mixtures, such as natural gas, coal gas, turpentine, hydrogen, and oil.

Which of the following are true statements about “the most expensive pot in the world”?

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The diesel engine was disregarded because of its low thermal efficiency. Even though James Watt’s steam engine was commercially successful, it was not energy efficient. James Watt continued to build engines through the 1800s: some ran on natural gas. Some experts began writing studies about diesel, especially after there was a gasoline shortage threat.

Result:

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Option 2: "Even though James Watt’s steam engine was commercially successful, it was not energy efficient."

Explanation: This option is correct as the text explicitly mentions that while James Watt's steam engine was a commercial success, it wasted 90 percent of the energy in the fuel, indicating its inefficiency.

Option 1: "The diesel engine was disregarded because of its low thermal efficiency."

Explanation: This option is incorrect because the text states that the diesel engine was initially not considered a viable power plant in 1909, but it was noted for its high thermal efficiency. Therefore, it was not disregarded due to low efficiency.

Option 3: "James Watt continued to build engines through the 1800s: some ran on natural gas."

Explanation: This option is incorrect because the text does not state that James Watt continued to build engines through the 1800s. It only mentions that many engines were built during that time, but does not attribute this to Watt.

Option 4: "Some experts began writing studies about diesel, especially after there was a gasoline shortage threat."

Explanation: This option is correct as the text indicates that the threat of a gasoline shortage in 1917 and 1918 led to increased attention on diesel engines, resulting in numerous technical papers being written about them.

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