Q.1
What is the nature of the trajectory of rockets in gravity-free, drag-free environment?
  • a) Two-dimensional, curved path
  • b) One dimensional, curved path
  • c) Two-dimensional, straight line path
  • d) One dimensional, straight line path
Q.2
How will propellant mass flow and thrust change with burn duration in a gravity-free, drag-free environment?
  • a) Mass flow and thrust remains constant
  • b) Mass flow increases, thrust decreases
  • c) Mass flow decreases, thrust increases
  • d) Mass flow decreases, thrust decreases
Q.3
Where do we account for residual propellant mass in a rocket engine?
  • a) Propellant mass
  • b) Inert mass
  • c) Payload mass
  • d) Structural mass
Q.4
What is the nature of the effect of the propellant mass fraction on the vehicle velocity?
  • a) Exponential
  • b) Logarithmic
  • c) Linear
  • d) Parabolic
Q.5
Keeping the system inert mass constant, which of the following changes will not result in flight velocity increment?
  • a) Use of better propellants
  • b) A more favorable nozzle area ratio
  • c) Higher chamber pressure
  • d) Better nozzle cooling
Q.6
For given average effective exhaust velocity(c), which of the following values of propellant mass fractions(ζ) gives maximum vehicle velocity (up)?
  • a) 0.6
  • b) 0.7
  • c) 0.8
  • d) 0.9
Q.7
What is the effect of increasing mass ratio (mo/mb, where mo is the initial mass and mb is the burnout mass) on Isp?
  • a) Increases
  • b) Decreases
  • c) No effect
  • d) Increases only after a limit
Q.8
Which of the following will decrease the effective propellant fraction?
  • a) Higher system inert mass
  • b) More favorable nozzle area ratio
  • c) Higher chamber pressure
  • d) Higher temperature at the inlet of the nozzle
Q.9
Which of these is a reasonable value of the mass ratio (Initial mass/inert mass) for single-stage vehicles for gravitation free drag-free space flight?
  • a) 100
  • b) 1000
  • c) 200
  • d) 20
Q.10
Which of these is a reasonable value of the mass ratio (Initial mass/inert mass) for multistage vehicles for gravitation free drag-free space flight?
  • a) 100
  • b) 1000
  • c) 200
  • d) 20
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