Chemical Rocket Propellant MCQ

Test your knowledge with important Chemical Rocket Propellant MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Chemical Rocket Propellant MCQs at Bissoy

• Knocking in spark-ignition internal combustion engines is not the same as ____________
  ক

  detonation

  খ

  pinging

  গ

  pinking

  ঘ

  pre-ignition
• ____________ is not a metallic additive in rocket propellants.
  ক

  Beryllium

  খ

  Aluminum

  গ

  Nitroglycerine

  ঘ

  Boron
• 1-methyl-1, 2-dicyclopropyl cyclopropane is also called as ____________
  ক

  Syntin

  খ

  Kerosene

  গ

  RP-1

  ঘ

  Jet fuel
• The fuel which releases the most energy per unit mass of combustion is ____________
  ক

  LH2

  খ

  RP-1

  গ

  Kerosene

  ঘ

  Methane
• Which of the following fuels were used in the first stage of Titan I?
  ক

  RP-1

  খ

  RDX

  গ

  HMX

  ঘ

  LH2
• Which of the following is a highly refined form of kerosene used as rocket fuel?
  ক

  RP-1

  খ

  HMX

  গ

  RDX

  ঘ

  C-4
• Dissociation of the reaction products __________ with the rise in the chamber temperature and _________ with the rise in chamber pressure of a chemical rocket engine.
  ক

  increases, increases

  খ

  decreases, increases

  গ

  decreases, decreases

  ঘ

  increases, decreases
• What is the average diameter of a solid particle in a nozzle flow above which there is a chance of occurrence of thermal lag?
  ক

  0.1 μm

  খ

  10 μm

  গ

  100 μm

  ঘ

  1 μm
• In which of the following modes of analysis does the temperature, velocity or pressure at any normal cross-section of an axisymmetric nozzle remain to be the same?
  ক

  One dimensional

  খ

  Two dimensional

  গ

  Three dimensional

  ঘ

  N-dimensional, where N can be 1,2,3,…
• In which of the following cases is the chemical equilibrium maintained instantaneously, even though the gas composition varies through the nozzle due to temperature and pressure variations along the nozzle?
  ক

  Frozen equilibrium

  খ

  Non-equilibrium

  গ

  Shifting equilibrium

  ঘ

  Isothermal equilibrium
• What is the typical value of penalty incurred by assuming a frozen equilibrium rocket performance?
  ক

  1-4%

  খ

  0%

  গ

  12-15%

  ঘ

  25-30%
• Assertion: The condensed phases (liquid and solid) are assumed to have zero volume. Reason: Particles or droplets are very small in size.
  ক

  The assertion is correct, but the reason is incorrect

  খ

  Both assertion and reason are incorrect
• Which of the following effects are neglected for simple cases of nozzle expansion?
  ক

  Heat exchange

  খ

  Frictional effects

  গ

  Divergence angle

  ঘ

  Reversibility
• Which of the following is not true for an ideal expansion in the nozzle?
  ক

  Adiabatic, reversible expansion

  খ

  Drop in static temperature and pressure

  গ

  Drop in stagnation temperature and pressure

  ঘ

  Conversion of thermal to kinetic energy
• What is the approximate number of species or compounds present in the exhaust for a solid propellant rocket engine?
  ক

  10

  খ

  50

  গ

  100

  ঘ

  200
• Combustion efficiency in liquid propellant rocket engines __________ with an increase in combustion temperature.
  ক

  increases

  খ

  decreases

  গ

  doesn’t change

  ঘ

  oscillates
• Energy release efficiency is also called as ___________
  ক

  isentropic efficiency

  খ

  polytropic efficiency

  গ

  propulsive efficiency

  ঘ

  combustion efficiency
• Out of the following products of the reaction of hydrogen and oxygen, which of them is unstable?
  ক

  Hydrogen

  খ

  Hydrogen peroxide

  গ

  Hydroxyl

  ঘ

  Water
• If the energy balance in the chemical reaction within the thrust chamber is thought of as a two-step process, what is the initial step in the process?
  ক

  Isothermal chemical reaction at the reference temperature

  খ

  Isentropic chemical reaction at the reference temperature

  গ

  Adiabatic chemical reaction at the reference temperature

  ঘ

  Heating of gases with the energy release from the chemical reaction
• The heat created by the combustion in the thrust chamber of a chemical rocket engine equals the change in enthalpy of the gases.
  ক

  True

  খ

  False
• What is the energy released (or absorbed), or the enthalpy change when one mole of a chemical compound is formed from its constituent atoms or elements at one bar and isothermally at 25°C?
  ক

  Heat of formation

  খ

  Heat of reaction
• The decomposition of solid propellants to reaction mixture is a(n) ______________ chemical reaction.
  ক

  reversible

  খ

  irreversible

  গ

  stoichiometric

  ঘ

  ideal
• Rocket propulsion usually operates in ___________ mixture ratio.
  ক

  fuel rich

  খ

  oxidizer rich

  গ

  stoichiometric

  ঘ

  any
• Determine the stoichiometric mixture mass ratio for the complete reaction: H2 + 1/2 O2 → H2O.
  ক

  2:1

  খ

  16:1

  গ

  4:1

  ঘ

  8:1
• What is the number of condensed species in a gaseous mixture, if there are 8 possible species which enter into a relationship and out of these, only 5 are gases?
  ক

  3

  খ

  2

  গ

  9

  ঘ

  6
• In a gaseous mixture, the number of moles and the molecular mass (in their respective units) of each component is given as follows: nA = 1, MA = 23; nB = 2, MB = 48; nC = 3, MC = 19. Find the average molecular mass of the mixture.
  ক

  28.67

  খ

  29.33

  গ

  31.25

  ঘ

  25.47
• Consider two sets of mixture of gases X and Y having the same total temperature of the mixture and having total pressures PX and PY respectively. If PX = 1.4 PY and molecular mass of A MX = 2.3 x MY, determine the ratio of Vmix_X/Vmix_Y.
  ক

  0.26

  খ

  0.52

  গ

  0.62

  ঘ

  0.31
• Consider two sets of mixture of gases A and B having the same specific volume of the mixture and having total pressures PA and PB respectively. If TA = 3TB and molecular mass of A MA = 1/2 MB, determine the ratio of PA/PB.
  ক

  0.75

  খ

  12

  গ

  1.5

  ঘ

  6
• Perfect gas equation applies very closely to ________ gases.
  ক

  low temperature, low pressure

  খ

  high temperature, high pressure

  গ

  high temperature, low pressure

  ঘ

  low temperature, high pressure
• Consider a mixture of three gases a, b and c at equilibrium. If the individual gas components have pressures equal to Pa, Pb and Pc, determine the total pressure P of the mixture of gases. / (Pa + Pb + Pc) d) P = (Pa x Pb / Pc) + (Pb x Pc / P
  ক

  P = Pa + Pb + Pc / (Pa + Pb + Pc) d) P = (Pa x Pb / Pc) + (Pb x Pc / P] + (Pc x Pa / P

  খ

  P = Pa x Pb x Pc /(Pa + Pb + P

  গ

  [ P = [(Pa x Pb) + (Pb x P[ + (Pc x Pa)

  ঘ

  (Pa x Pb) + (Pb x Pc) + (Pc x Pa)