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Rocket Propulsion Practice Test: Liquid Propellant Rocket Engine
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Liquid Propellant Rocket Engine topics include: Liquid propellants, gas pressure feed systems, propellant tanks, tank pressurization, turbopump feed systems and engine cycles, flow and pressure balance, rocket engines for manueuvering, orbit adjustments or attitude control, liquid propellant rocket engine feed systems and engine support structure. A liquid propellant rocket engine (LRE) is a rocket propulsion system that uses liquid propellants to burn. LREs are used in space vehicles and expandable and reusable launchers worldwide.  LREs use a bipropellant configuration, where the fuel and... Show more
Rocket Propulsion Practice Test: Liquid Propellant Rocket Engine
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25 Questions

1. Pressurizing gas cannot perform ___________
2. What is the nature of thrusters and feed system for attitude control rocket engines?
3. ____________ are used for preventing the propellant flow back into the tanks and avoiding inadvertent mixing of propellants in the flow passage.
4. A thruster firing repeatedly for 0.010 seconds each time followed by a pause of 0.020 seconds or 0.150 seconds is an example for __________
5. When a section of the system has a leak or malfunction ____________ are used to shut it off.
6. If the gear ratio for fuel pump is thrice that of the oxidizer pump, the shaft speed of fuel pump is ____________ the oxidizer pump.
7. Which of the following gases cannot be used for gas pressure feed systems?
8. How are liquid rocket engines classified on the basis of their feed system?
9. In gas generator cycles, the turbine inlet gas is obtained from a portion of exhaust gases about to pass through the rocket nozzle.
10. Determine the amount of propellant trapped in pipe, fittings, and valve corners and lost by other means, if the initial mass of the propellant was M and it had an expulsion efficiency of 97%.
11. At what temperature are the liquid oxygen and the liquid hydrogen kept in their storage tanks of the cryogenic rocket engine?
12. Which of the following is not the function of an OMS?
13. In a turbopump, what are are the gear ratios for ao and af (for oxidizer pump and fuel pump respectively) if no gears are used?
14. Which of the following engines uses a staged combustion cycle?
15. Open cycles perform better than closed cycle in a turbopump feed type rocket engine.
16. For effective propellant utilization, the rate at which tank can expulse the propellants should be ____________ and the amount of residual propellants should be ____________
17. Which of the following ways of thrust chamber cooling may use niobium metal?
18. For the application of pure torques in three directions, it requires ______ thrusters.
19. Which of the following is not a characteristic of staged combustion cycle compared to other cycles?
20. If power of turbines equals PT, power consumed by pumps is PP and the power consumed by auxiliaries is PA, what is the expression for auxiliary power?
21. Which of the following materials of the propellant tank requires a thin inner liner of metal to avoid leakage?
22. Which of the following statements is correct?
23. The thruster is also called as _____________
24. What is the total mass flow rate through the gas generator if the oxidizer flow through it is 15 kg/s and fuel flow is 18 kg/s?
25. For very short pulse duration of the thruster firing, the specific impulse is degraded by __________

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