(Electric Propulsion MCQs Aeronautical Engineering

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Which of the following is a primary type of electric propulsion system used in spacecraft? A) Hall Effect Thruster B) Solid Rocket Motor C) Liquid Rocket Engine D) Hybrid Rocket Answer: A) Hall Effect Thruster 2. What principle does a Hall Effect Thruster use to generate thrust? A) Electromagnetic acceleration of ions B) Chemical reaction C) Expanding high-pressure gas D) Magnetic confinement Answer: A) Electromagnetic acceleration of ions 3. Which component in a Hall Effect Thruster creates the electric field needed to accelerate ions? A) Anode B) Cathode C) Magnetic Coil D) Ion Beam Answer: C) Magnetic Coil 4. What is the primary advantage of using electric propulsion over chemical propulsion? A) Higher specific impulse B) Higher thrust-to-weight ratio C) Lower complexity D) Immediate thrust generation Answer: A) Higher specific impulse 5. Which electric propulsion system uses an RF (radio frequency) field to ionize the propellant? A) RF Ion Thruster B) Hall Effect Thruster C) Gridded Ion Thruster D) Pulsed Plasma Thruster Answer: A) RF Ion Thruster 6. What is the typical propellant used in an ion thruster? A) Hydrogen B) Xenon C) Methane D) Nitrogen Answer: B) Xenon 7. In an electric propulsion system, what does the term “specific impulse” refer to? A) The efficiency of the propulsion system in terms of thrust produced per unit of propellant B) The total energy output of the propulsion system C) The amount of fuel required for a mission D) The thrust-to-weight ratio of the propulsion system Answer: A) The efficiency of the propulsion system in terms of thrust produced per unit of propellant 8. Which propulsion system is known for its high efficiency and use of a magnetic field to accelerate plasma? A) Hall Effect Thruster B) Chemical Rocket C) Solid Rocket Motor D) Hybrid Rocket Answer: A) Hall Effect Thruster 9. What is the primary function of the power processing unit in an electric propulsion system? A) To convert electrical power into a suitable form for the thruster B) To store excess energy C) To manage thermal dissipation D) To provide backup power Answer: A) To convert electrical power into a suitable form for the thruster 10. Which electric propulsion system is characterized by its use of a magnetic field to create thrust? A) Magnetoplasma Rocket B) Hall Effect Thruster C) Pulsed Plasma Thruster D) Gridded Ion Thruster Answer: A) Magnetoplasma Rocket 11. Which type of electric propulsion system is best suited for long-duration space missions? A) Hall Effect Thruster B) Chemical Rocket C) Solid Rocket Motor D) Hybrid Rocket Answer: A) Hall Effect Thruster 12. Which propulsion technology uses an electrostatic field to accelerate ions? A) Gridded Ion Thruster B) Hall Effect Thruster C) Pulsed Plasma Thruster D) VASIMR Answer: A) Gridded Ion Thruster 13. In which electric propulsion system are ion beams created and directed by an electric field? A) Gridded Ion Thruster B) Hall Effect Thruster C) Magnetoplasma Rocket D) Pulsed Plasma Thruster Answer: A) Gridded Ion Thruster 14. What is the primary advantage of using xenon as a propellant in ion thrusters? A) High atomic mass and low ionization energy B) Low cost and high availability C) High temperature stability D) High reactivity Answer: A) High atomic mass and low ionization energy 15. Which propulsion system is specifically designed for fine attitude control and station-keeping? A) Cold Gas Thruster B) Hall Effect Thruster C) Chemical Rocket D) Solid Rocket Motor Answer: A) Cold Gas Thruster 16. Which of the following is NOT a characteristic of electric propulsion systems? A) High thrust-to-weight ratio B) High specific impulse C) Low power consumption D) Continuous thrust capability Answer: A) High thrust-to-weight ratio 17. What is the function of the magnetic field in a Hall Effect Thruster? A) To confine and accelerate electrons B) To ionize the propellant C) To generate the initial thrust D) To cool the thruster components Answer: A) To confine and accelerate electrons 18. Which propulsion system utilizes a rotating electric field to accelerate ions? A) Hall Effect Thruster B) RF Ion Thruster C) Gridded Ion Thruster D) Pulsed Plasma Thruster Answer: B) RF Ion Thruster 19. What is the main limitation of electric propulsion systems compared to chemical propulsion systems? A) Lower thrust-to-weight ratio B) Higher complexity C) Lower efficiency D) Shorter operational lifetime Answer: A) Lower thrust-to-weight ratio 20. Which electric propulsion system is known for its use of high-voltage grids to accelerate ions? A) Gridded Ion Thruster B) Hall Effect Thruster C) Magnetoplasma Rocket D) Pulsed Plasma Thruster Answer: A) Gridded Ion Thruster 21. What does the term “thrust-to-power ratio” refer to in electric propulsion systems? A) The amount of thrust produced per unit of electrical power consumed B) The total energy output of the propulsion system C) The efficiency of ion acceleration D) The specific impulse of the propulsion system Answer: A) The amount of thrust produced per unit of electrical power consumed 22. Which electric propulsion system is best for high-precision maneuvers in space? A) Cold Gas Thruster B) Hall Effect Thruster C) Chemical Rocket D) Solid Rocket Motor Answer: A) Cold Gas Thruster 23. In a Hall Effect Thruster, what role does the cathode play? A) It supplies electrons to the discharge chamber B) It generates the magnetic field C) It accelerates the ions D) It ionizes the propellant Answer: A) It supplies electrons to the discharge chamber 24. Which component is used to generate high-energy ions in a gridded ion thruster? A) Ionization Chamber B) Magnetic Coil C) Grid Electrode D) Plasma Chamber Answer: C) Grid Electrode 25. Which electric propulsion technology is characterized by its use of high-temperature superconductors? A) Magnetoplasma Rocket B) Hall Effect Thruster C) RF Ion Thruster D) Pulsed Plasma Thruster Answer: A) Magnetoplasma Rocket 26. What is the primary purpose of a thrust chamber in electric propulsion systems? A) To contain and accelerate the propellant B) To store electrical energy C) To manage thermal dissipation D) To generate high voltage Answer: A) To contain and accelerate the propellant 27. Which propulsion system operates by expelling ionized gas at high velocities? A) Ion Thruster B) Chemical Rocket C) Solid Rocket Motor D) Hybrid Rocket Answer: A) Ion Thruster 28. Which electric propulsion system is known for its low thrust but high efficiency? A) Hall Effect Thruster B) Chemical Rocket C) Solid Rocket Motor D) Pulsed Plasma Thruster Answer: A) Hall Effect Thruster 29. Which electric propulsion system can achieve the highest specific impulse? A) Gridded Ion Thruster B) Hall Effect Thruster C) Chemical Rocket D) Pulsed Plasma Thruster Answer: A) Gridded Ion Thruster 30. What is the main advantage of using xenon over other gases in ion thrusters? A) Higher atomic mass and lower ionization energy B) Lower cost and greater availability C) Higher reactivity and easier storage D) Better performance in low temperatures Answer: A) Higher atomic mass and lower ionization energy 31. Which propulsion system uses a magnetic field to accelerate plasma and produce thrust? A) VASIMR B) Hall Effect Thruster C) Gridded Ion Thruster D) Pulsed Plasma Thruster Answer: A) VASIMR 32. What is the primary function of a plasma chamber in electric propulsion systems? A) To ionize the propellant B) To generate high voltage C) To cool the system D) To store electrical energy Answer: A) To ionize the propellant 33. Which electric propulsion system is designed to operate efficiently at very high speeds? A) Hall Effect Thruster B) Chemical Rocket C) Solid Rocket Motor D) Pulsed Plasma Thruster Answer: A) Hall Effect Thruster 34. What is a key characteristic of the VASIMR propulsion system? A) Use of a magnetic field to ionize and accelerate plasma B) High thrust-to-weight ratio C) Low power consumption D) Use of chemical reactions for thrust Answer: A) Use of a magnetic field to ionize and accelerate plasma 35. Which electric propulsion system provides precise control of thrust for spacecraft maneuvering? A) Hall Effect Thruster B) Chemical Rocket C) Solid Rocket Motor D) Pulsed Plasma Thruster Answer: A) Hall Effect Thruster 36. In an ion thruster, what is the purpose of the ionization chamber? A) To generate ions from the propellant B) To accelerate ions to high velocities C) To contain the magnetic field D) To convert electrical power into ion energy Answer: A) To generate ions from the propellant 37. Which propulsion system is typically used for fine adjustments in satellite orientation? A) Cold Gas Thruster B) Hall Effect Thruster C) Chemical Rocket D) Solid Rocket Motor Answer: A) Cold Gas Thruster 38. Which propulsion system benefits from using a pulsed plasma discharge for ion acceleration? A) Pulsed Plasma Thruster B) Hall Effect Thruster C) Gridded Ion Thruster D) VASIMR Answer: A) Pulsed Plasma Thruster 39. What is the main challenge associated with electric propulsion systems? A) High power consumption B) Complexity of design and operation C) Low specific impulse D) Limited thrust capability Answer: B) Complexity of design and operation 40. Which electric propulsion system is known for its application in deep space missions? A) Ion Thruster B) Chemical Rocket C) Solid Rocket Motor D) Hybrid Rocket Answer: A) Ion Thruster 41. Which electric propulsion system is known for high efficiency and continuous thrust generation? A) Hall Effect Thruster B) Chemical Rocket C) Solid Rocket Motor D) Pulsed Plasma Thruster Answer: A) Hall Effect Thruster 42. What role does the ionization chamber play in an electric propulsion system? A) It ionizes the propellant B) It generates electrical power C) It accelerates ions D) It cools the propulsion system Answer: A) It ionizes the propellant 43. Which electric propulsion system uses a magnetic field to control the direction of the thrust? A) Hall Effect Thruster B) Chemical Rocket C) Solid Rocket Motor D) Hybrid Rocket Answer: A) Hall Effect Thruster 44. What is the advantage of using high-voltage grids in a gridded ion thruster? A) Higher ion acceleration and specific impulse B) Lower power consumption C) Simpler design and operation D) Lower cost Answer: A) Higher ion acceleration and specific impulse 45. Which electric propulsion system is most suitable for deep space missions requiring long-duration thrust? A) Hall Effect Thruster B) Chemical Rocket C) Solid Rocket Motor D) Hybrid Rocket Answer: A) Hall Effect Thruster 46. In an electric propulsion system, what is the role of the propellant management system? A) To regulate the flow of propellant to the thruster B) To generate electrical power C) To accelerate ions D) To ionize the propellant Answer: A) To regulate the flow of propellant to the thruster 47. Which component in a Hall Effect Thruster helps create a uniform magnetic field? A) Magnetic Coil B) Ion Beam C) Anode D) Cathode Answer: A) Magnetic Coil 48. Which electric propulsion system can achieve high thrust at the cost of efficiency? A) Chemical Rocket B) Hall Effect Thruster C) Gridded Ion Thruster D) Pulsed Plasma Thruster Answer: A) Chemical Rocket 49. What is the primary benefit of using a high-efficiency electric propulsion system in space missions? A) Ability to sustain long-duration missions with minimal propellant B) High thrust-to-weight ratio C) Simplicity and ease of maintenance D) Immediate thrust generation Answer: A) Ability to sustain long-duration missions with minimal propellant 50. Which electric propulsion system is known for its ability to provide very precise thrust control? A) Hall Effect Thruster B) Chemical Rocket C) Solid Rocket Motor D) Hybrid Rocket Answer: A) Hall Effect Thruster

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