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Exercise 25. Say about the jet engines using the following words and word-combinations.
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Jet Engines
to be divided into
   Air-Breathing Engines
to utilize (to use) air from
to be divided into
Gas Turbine Engines
Turbojet Engines
to be divided into 2 groups
there are … compressors
to be equipped with …
to be used for … aircraft
Turboprop Engines
to use propellers to provide
to be heavier than
to be lower
to be used for …aircraft
Turbofan Engines
to combine features of…
to be replaced by
to be lighter than
to have low fuel consumption
to produce more thrust than
to be used for …aircraft
Turboshaft Engines
to be used for
| Ramjet Engines the simplest to be not widely used in Pulsejet Engines to be used for the main disadvantage |  Rocket Engines
to carry fuel and oxidizer
to operate in
to be divided into:
solid-propellant
rocket engines
liquid- propellant
rocket engines
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Exercise 26. The most important types of engines are turbojet and turboprop engines. Let’s compare them according to the following parameters.
| Turbojet engines | Turboprop engines | |
| Thrust is produced by | the jet of hot gases ejected from the rear | the propellers |
| Weight | ||
| Size | ||
| Speed | ||
| Fuel consumption | ||
| Use in airplanes |
1. What engine is heavier?
2. What about their size?
3. What engine develops higher speed?
4. What engine consumes more fuel?
5. What airplanes are powered by turboprop engines?
6. What airplanes are powered by turbojet engines?
s?
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