Spaceflight Mechanics MCQ

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• In which case does the optimum velocity increment occur provided exhaust velocities and propellant are same for all the stages?
  ক

  Payload ratios of all stages are equal

  খ

  Structural ratios of all stages are unequal

  গ

  Mass of each stage is unequal

  ঘ

  Structural coefficient of all stages are unequal
• How many stages of a rocket in considered to be an optimum choice?
  ক

  1

  খ

  2-3

  গ

  5-6

  ঘ

  8-10
• In which type of staging, the specific impulse of all the individual stages are same?
  ক

  Restricted staging

  খ

  Optimal staging

  গ

  Parallel staging

  ঘ

  Serial staging
• Similar stages with same size and properties yield different echaust velocities.
  ক

  True

  খ

  False
• For optimal rockets, what should be the value of specific impulse of initial stages compared to later stages?
  ক

  Zero

  খ

  High vaue

  গ

  Low value

  ঘ

  Infinite
• For an optimal rocket, the specific impulse and structural ratio can have any values.
  ক

  True

  খ

  False
• What is a feature of an optimal rocket?
  ক

  Highest payload ratio efficiency

  খ

  Highest structural ratio efficiency

  গ

  Highest propellant mass ratio efficiency

  ঘ

  Highest thrust
• Addition of parallel boosters in a rocket causes increase in payload massfor the same velocity change.
  ক

  True

  খ

  False
• The process of making design changes to improve both the performance and efficiency is known as mission trade-off.
  ক

  True

  খ

  False
• What is one modification done for improvement in rocket’s payload carrying capacity?
  ক

  Increase fuel

  খ

  Advancement in propellant used

  গ

  Addition of strap-on boosters

  ঘ

  Increate burn time
• What is the process of getting rid of burnt out modules of the rocket once its propellant has been consumed called?
  ক

  Staging

  খ

  Space tugging

  গ

  Ejection

  ঘ

  Expulsion
• Which of these is not comprised in total mass of the rocket?
  ক

  Propellant mass

  খ

  Structural mass

  গ

  Payload mass

  ঘ

  Material mass
• What is the special case of parallel staging called in which the burn time of the boosters is same as the burn time of the core stages?
  ক

  Serial staging

  খ

  Compund staging

  গ

  Cluster staging

  ঘ

  Aggregate staging
• The zeroth stage for parallel staging rockets incorporates only the parral boosters which are attached to the space shuttle.
  ক

  True

  খ

  False
• What is the term used to describe the stages of rocket attached to the space vehicle in parallel rocket?
  ক

  Strap on booster rocket

  খ

  Space shuttle

  গ

  Engine

  ঘ

  Subsidiary stages
• In case of parallel staging, the stages of rocelts are burnt sequentially.
  ক

  True

  খ

  False
• What is the advantage of parallel staging over serial staging?
  ক

  Increasing total efficiency

  খ

  Less time consuming

  গ

  More payload capacity

  ঘ

  Aesthetics
• Which of these propellants is used for upper stages in multi-stage rockets?
  ক

  Gas propellants

  খ

  Solid propellant

  গ

  Liquid propellant

  ঘ

  Cryogenic propellant
• Space-shuttles employ which of the staging?
  ক

  Tandem stage

  খ

  Parallel stage

  গ

  Ordered stage

  ঘ

  Sequential stage
• Parallel staging rockets are more efficient than the serial staging rockets.
  ক

  True

  খ

  False
• Which of these is not a dimensionless performance quantity to assess the performance of the rocket?
  ক

  Initial to final mass ratio η

  খ

  Structural ratio ∈

  গ

  Aerodynamic ratio α

  ঘ

  Payload ratio λ
• In which of these multi-stage rockets are the stages arranged alongside one another?
  ক

  Tandem stage

  খ

  Parallel stage

  গ

  Ordered stage

  ঘ

  Sequential stage
• In which of these multi-stage rockets are the stages arranged serially?
  ক

  Tandem stage

  খ

  Parallel stage

  গ

  Ordered stage

  ঘ

  Sequential stage
• Why is single stage rocket not used often?
  ক

  Low exhaust velocity

  খ

  Lesser fuel

  গ

  High mass

  ঘ

  Low delta-v
• What is the ideal propellant used for single-stage rockets?
  ক

  Cryogenic solid

  খ

  Liquid propellant

  গ

  Solid propellant

  ঘ

  Hybrid propellant
• What is the minimum specific impulse required for a single stage rocket?
  ক

  300 s

  খ

  415 s

  গ

  500 s

  ঘ

  525 s
• When the payload ratio increases to 1, the performace of the single rocket diminishes to zero.
  ক

  True

  খ

  False
• What is the minimum value of the structural ratio?
  ক

  1

  খ

  2

  গ

  0.05

  ঘ

  0.5
• Payload mass is included in the structural ratio of the sinle rocket.
  ক

  True

  খ

  False
• What is an advantage of a solid rocket engine?
  ক

  Throttleable

  খ

  No moving parts

  গ

  Low temperature in combustion chamber

  ঘ

  Solid fuel is inert without oxidizer