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Consider the following statements regarding performance of turbojet engines:
1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.
2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.
3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.
4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.
Which of the statements given above are correct?
1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.
2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.
3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.
4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.
Which of the statements given above are correct?
- a)1, 2, 3 and 4
- b)1 and 3
- c)1, 2 and 4
- d)2, 3 and 4
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements regarding performance of turbojet en...
Ans. (d) The turbojet is almost a constant thrust engine.
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Consider the following statements regarding performance of turbojet en...
Correct statements:
1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.
2. At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.
3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.
Explanation:
1. The thrust of a turbojet engine is dependent on the mass flow rate of air passing through the engine. At higher altitudes, the density of air decreases, which means there is less air available for the engine to intake. This leads to a lower mass flow rate of air, resulting in a decrease in thrust.
2. At subsonic speeds, the effect of increased velocity is to increase the air flow. As the velocity of the aircraft increases, more air is being ingested into the engine, which leads to an increase in the mass flow rate of air. This, in turn, increases the thrust produced by the engine.
3. At higher speeds, the relative velocity of the jet with respect to the medium (air) decreases. This can be understood by considering an aircraft flying at a very high speed. The jet exhaust is expelled at a high velocity, but as the aircraft speed increases, the relative speed of the jet with respect to the surrounding air decreases. This decrease in relative velocity reduces the thrust produced by the engine.
Incorrect statement:
4. For a turbojet engine, the thrust of the jet at subsonic speeds remains relatively constant.
Explanation:
The statement is incorrect because at subsonic speeds, the thrust produced by a turbojet engine increases with increasing velocity. This is due to the increased mass flow rate of air being ingested into the engine, as explained in statement 2.
Therefore, the correct statements are 1, 2, and 3.
1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.
2. At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.
3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.
Explanation:
1. The thrust of a turbojet engine is dependent on the mass flow rate of air passing through the engine. At higher altitudes, the density of air decreases, which means there is less air available for the engine to intake. This leads to a lower mass flow rate of air, resulting in a decrease in thrust.
2. At subsonic speeds, the effect of increased velocity is to increase the air flow. As the velocity of the aircraft increases, more air is being ingested into the engine, which leads to an increase in the mass flow rate of air. This, in turn, increases the thrust produced by the engine.
3. At higher speeds, the relative velocity of the jet with respect to the medium (air) decreases. This can be understood by considering an aircraft flying at a very high speed. The jet exhaust is expelled at a high velocity, but as the aircraft speed increases, the relative speed of the jet with respect to the surrounding air decreases. This decrease in relative velocity reduces the thrust produced by the engine.
Incorrect statement:
4. For a turbojet engine, the thrust of the jet at subsonic speeds remains relatively constant.
Explanation:
The statement is incorrect because at subsonic speeds, the thrust produced by a turbojet engine increases with increasing velocity. This is due to the increased mass flow rate of air being ingested into the engine, as explained in statement 2.
Therefore, the correct statements are 1, 2, and 3.
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Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer?.
Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer?.
Solutions for Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
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Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer?, a detailed solution for Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Consider the following statements regarding performance of turbojet engines:1. The thrust decreases at higher altitude due to reduced density of air and consequently lower mass flow of air.2 At subsonic speeds, the effect of increased velocity is to increase the air flow and the thrust increases.3. The relative velocity of jet with respect to the medium decreases at higher speeds which tends to reduce the thrust.4 For turbojet engine the thrust of jet at subsonic speeds remains relatively constants.Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 3c)1, 2 and 4d)2, 3 and 4Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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