Mechanical Engineering Exam > Mechanical Engineering Questions > Assertion (A): Propulsion efficiency of prope...
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Assertion (A): Propulsion efficiency of propeller driven aircraft is low at very highspeeds.
Reason (R): At high speeds, shock waves are formed over propeller blades.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'A'. Can you explain this answer?
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Understanding Propulsion Efficiency
The assertion and reason presented in the question relate to the efficiency of propeller-driven aircraft at high speeds.
Assertion (A): Low Propulsion Efficiency at High Speeds
- Propeller-driven aircraft tend to experience reduced propulsion efficiency when operating at very high speeds.
- This is primarily due to aerodynamic factors, including increased drag, which outweigh the benefits of higher thrust.
Reason (R): Formation of Shock Waves
- At high speeds, particularly approaching or exceeding the speed of sound, shock waves form over the propeller blades.
- These shock waves disrupt airflow, leading to increased drag and turbulence, which adversely affects the performance of the propeller.
Analysis of the Options
- Both A and R are individually true and R is the correct explanation of A: This option suggests that the formation of shock waves is the reason for the low propulsion efficiency. However, while both statements are true, R does not fully explain why A is true.
- Both A and R are individually true but R is not the correct explanation of A: This is the correct option because while both statements are accurate, the low efficiency at high speeds is influenced by various factors beyond just shock waves.
- A is true but R is false: This option is incorrect since R is true.
- A is false but R is true: This option is also incorrect as A is indeed true.
Conclusion
The correct answer is option 'A' because both statements are true, but the reason does not adequately explain the assertion about low propulsion efficiency at high speeds.
The assertion and reason presented in the question relate to the efficiency of propeller-driven aircraft at high speeds.
Assertion (A): Low Propulsion Efficiency at High Speeds
- Propeller-driven aircraft tend to experience reduced propulsion efficiency when operating at very high speeds.
- This is primarily due to aerodynamic factors, including increased drag, which outweigh the benefits of higher thrust.
Reason (R): Formation of Shock Waves
- At high speeds, particularly approaching or exceeding the speed of sound, shock waves form over the propeller blades.
- These shock waves disrupt airflow, leading to increased drag and turbulence, which adversely affects the performance of the propeller.
Analysis of the Options
- Both A and R are individually true and R is the correct explanation of A: This option suggests that the formation of shock waves is the reason for the low propulsion efficiency. However, while both statements are true, R does not fully explain why A is true.
- Both A and R are individually true but R is not the correct explanation of A: This is the correct option because while both statements are accurate, the low efficiency at high speeds is influenced by various factors beyond just shock waves.
- A is true but R is false: This option is incorrect since R is true.
- A is false but R is true: This option is also incorrect as A is indeed true.
Conclusion
The correct answer is option 'A' because both statements are true, but the reason does not adequately explain the assertion about low propulsion efficiency at high speeds.
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Assertion (A): Propulsion efficiency of propeller driven aircraft is low at very highspeeds.Reason (R): At high speeds, shock waves are formed over propeller blades.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?
Question Description
Assertion (A): Propulsion efficiency of propeller driven aircraft is low at very highspeeds.Reason (R): At high speeds, shock waves are formed over propeller blades.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. 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 Assertion (A): Propulsion efficiency of propeller driven aircraft is low at very highspeeds.Reason (R): At high speeds, shock waves are formed over propeller blades.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. 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 Assertion (A): Propulsion efficiency of propeller driven aircraft is low at very highspeeds.Reason (R): At high speeds, shock waves are formed over propeller blades.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?.
Assertion (A): Propulsion efficiency of propeller driven aircraft is low at very highspeeds.Reason (R): At high speeds, shock waves are formed over propeller blades.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. 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 Assertion (A): Propulsion efficiency of propeller driven aircraft is low at very highspeeds.Reason (R): At high speeds, shock waves are formed over propeller blades.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. 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 Assertion (A): Propulsion efficiency of propeller driven aircraft is low at very highspeeds.Reason (R): At high speeds, shock waves are formed over propeller blades.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?.
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ample number of questions to practice Assertion (A): Propulsion efficiency of propeller driven aircraft is low at very highspeeds.Reason (R): At high speeds, shock waves are formed over propeller blades.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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