Which ONE of the following is NOT an advantage of a hybrid propulsion installation which has both internal combustion engines and battery-powered electrical propulsion? Choose the ONE best answer.
1) Internal combustion engines can be shut down at periods of low engine use
2) Internal combustion engines can be run at optimum loads to increase their efficiency
3) The space required for the propulsion equipment and batteries is smaller
4) Internal combustion engines can be run at optimum loads to reduce their emissions
Answer (2)
The option that is NOT an advantage of a hybrid propulsion installation is 3) The space required for the propulsion equipment and batteries is smaller. Hybrid systems generally require more space due to the inclusion of both internal combustion engines and battery systems. Therefore, the correct choice is option 3.
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To address the question, let's consider the advantages of a hybrid propulsion system that combines internal combustion engines with battery-powered electrical propulsion.
Internal combustion engines can be shut down at periods of low engine use - This is an advantage because it allows the vehicle to rely solely on battery power during periods when the engine load is low, leading to fuel savings and reduced wear on the internal combustion engine.
Internal combustion engines can be run at optimum loads to increase their efficiency - This is also an advantage. When these engines operate at their most efficient load settings, they use fuel more efficiently, which results in better fuel economy and performance.
The space required for the propulsion equipment and batteries is smaller - This is NOT an advantage. A hybrid system typically requires additional space to accommodate both the internal combustion engine components and the batteries, generally resulting in more space utilization compared to a purely internal combustion or electric system.
Internal combustion engines can be run at optimum loads to reduce their emissions - This is another advantage as running engines efficiently tend to emit fewer pollutants.
Based on these considerations, the correct answer is 3) The space required for the propulsion equipment and batteries is smaller , which represents a disadvantage, not an advantage, of hybrid propulsion systems.
