# Propulsion – II

Propulsion means to push forward or drive an object forward. A propulsion system is a machine that produces thrust to push an object forward. On airplanes, thrust is usually generated through some application of Newton's third law of action and reaction. A gas, or working fluid, is accelerated by the engine, and the reaction to this acceleration produces a force on the engine. There are hundreds of different kinds of propulsion; here we only considering some of the Rocket propulsion, air breathing propulsion & electric propulsion.

_________ bypass turbo fan engines are used in sub sonic flights.
Jet engines works from newton’s law of motion.
_________ compressors are used in turbojets.
Turbofans gives more efficiency when the speed is ______ than the mach speed.
____________ compressors can be used in turbojets.
Stationary vanes are present in the ________ of the compressor.
Jet engines have ________ shafts.
Gas generator core is used in turbo fans.
Internal energy in the fuel is converted into __________ of the exhaust in turbojets
Airfoils are present in the ________ of the compressor.
Valve’s are present in the ________ of the centrifugal compressor.
Compressor belts are present in order to avoid ________ losses.
In radial equilibrium method centrifugal force is equated to _____
Stagnation enthalpy is _______ in turbo machine along the radial direction.
Third direction of the flow in turbo machinery is _______
The field produced by centrifugal force distorts the flow velocity.
Radial equilibrium theory assumes that flow is in equilibrium before and after the fluid entering the blade.
Centrifugal forces acts in ________
Over expansion occurs when exit area of nozzle is _________ than primary nozzle.
Convergent divergent nozzles used in rocket engines have _________ area ratio.
A pressure regulator consists of
What happens when nozzle doesn’t open after the burner is on ?
Inert character of nitrogen __________ the commercial value of gas.
What happens to mach number when divergence angle is 7 degrees?
Rocket engines require _______ mass flow rate.
Cryogenic fuels are stored under _______ temperatures.
Rocket engines require _______ mass flow rate.
Cryogenic fuels are in _________ state at room temperature and pressure
Cryogenic rocket engines are also called as hybrid rocket engines.
Hybrid rocket engines are also called as ________ propellant rocket engines.
_______is used as a cryogenic fuel.
Liquid hydrogen and oxygen mixture produces thrust upto ________
Movement speed of motor shaft is _________ when diffuser is used.
Vibration in rotor blades causes ________________
Stresses are divided into ____________
One of the advantages of a solid fuel is ______
One of the disadvantages of a solid fuel is:
The first stage of compression is done in ____ cylinder and next stage in ____ cylinder.
In perfect aftercooling, gas from intercooler has temperature equal to
For minimum work, the compression should be ____
_______ are used as rocket propellants in olden days.
Most available form of solid fuel is:
The volumetric efficiency ____ when carried out in stages.
Rapid combustion is
The lowest temperature at which a Substance catches fire is called its-
Combustion is a reaction in which a Substance reacts with-
Which one of the following is fuel of our body?
Fuel may be-
Explosion is the evolution of
Substance which vaporise during Burning gives
During the process of combustion ________is given out
The most common fire extinguisher is
Ideal fuel has ____ calorific value
Calorific value gives the
Calorific value is measured in
Unburnt carbon particle causes
Amount of heat energy produced on _____combustion of 1kg of fuel is Calorific value
Element showing spontaneous combustion is
Jet engines are classified into _______ types.
Jet engines works on ______ cycle.