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In a steam engine, the distance by which the inner edge of the D-slide valve overlaps the steam port is called lead.

In a steam engine, the distance by which the inner edge of the D-slide valve overlaps the steam port is called lead. Correct Answer False

In actual practise, the displacement of the D-slide valve is greater than the steam lap by a distance known as lead of the valve.

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In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called
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The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap.
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Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it. The first working steam­ powered vehicle was designed and most likely built by Ferdinand Verbies, a Flemish member of a Jesuit mission in China around 1672. It was a 65 cm long scale­ model toy for the Chinese Emperor, that was unable to carry a driver or a passenger. It is not known if Verbiest's model was ever built. Nicolas- Joseph Cugnot is widely credited with building the first full­ scale, self ­propelled mechanical vehicle or automobile in about 1769; he also created a steam­ powered tricycle. He constructed two steam tractors for the French Army, one of which is preserved in the French National Conservatory of Arts and Crafts. His inventions were however handicapped by problems of water supply and maintaining steam pressure. In 1801, Richard Trevithick built and demonstrated his Puffing Devil road locomotive, believed by many to be the first demonstration of a steam ­powered road vehicle. It was unable to maintain sufficient steam pressure for long periods. Sentiment against steam ­powered road vehicles led to the Locomotive Acts of 1865. In 1807 Nicephore Niepce and his brother Claude probably created the world's first internal combustion engine which they called Pyreolophore. The problem with Trevithick's Puffing Devil was:
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