ROCKET AND MISSILES
UNIT I
1. What are the types of igniters?
Gaseous igniter
Liquid igniter
Solid igniter
2. Define gaseous igniter.
The propellants used in the ingniter are of gaseous state. Reaction gaseous mixture stored in a
very thin tube with high pressure. Hazardous in natur...
1. What are the types of igniters?
Gaseous igniter
Liquid igniter
Solid igniter
2. Define gaseous igniter.
The propellants used in the ingniter are of gaseous state. Reaction gaseous mixture stored in a
very thin tube with high pressure. Hazardous in nature. Used only for space application.
3. Write down the characteristics of hypergolic liquids with example.
Very high bulk density.
Chemically stable.
Low vapour pressure.
Good heat transfer characteristics.
4. Explain bag igniter with advantage.
It is a old primitive igniter, that we don’t have much control over ignition. After the ignition
of fully charged bag igniter, the heat is released & the pressure generation occurs.
Its rate of increase is very high. So burst may occur.
The main advantage is easy to fabricate &cost of production is very low.
5. What do you meant by jelly roll?
A jell roll is a film coated pyrotechnic & binder is rolled over a rod. After rolling remove the
rod very carefully. Give the squib support at the front & back & rubber support externally.
6. What is alcojet?
Its a type of ballistically controlled igniter in which booster charge is ignited that is located in
the annular spacing between the tubes. The ignition passes through the perforation in the inner
wall to the main charge. There is perforation in the outer tube through which the flames come
out.
7. Explain the purpose of squib.
Squib is primary element of the ignition train that affects the conversion of electrical impulse
from the control console to chemical reaction in the rocket motors.
8. Difference between gas pressure & turbo pump feed system.
Gas pressure feed system:
Inert gas is carried separately..
No moving parts.
System is simple.
Unsuitable for large rocket engines& low range missiles.
Turbo pump feed system:
Not necessary to carry inert gas.
Having moving parts.
System is quite complex.
Suitable for large rocket engines& long range missiles.
9. Define combustion instability.
If the process of rocket combustion is not controlled, then combustion in stability occurs
which can occur very quickly cause excessive pressure, vibration force or excessive heat
transfer. When the fluctuations interact with the natural frequencies of the propellant feed
system periodic superimposed collision referredas instability.
10. What is proof test load?
Proof test load is applied to engines & their components during development &
manufacturing inspection. It is often equal to the design limit load.
, UNIT II
1. What are the components of rockets and missiles?
The body of the missiles may be divided into three major sections,theforebody, or
nose, the mid- section, and the aft or boattail, section.
2. Mention the shapes of forebody?
There are three types of forbody,they are
a) Conical forebody.
b) Ogvialforbody.
c) Hemispherical forebody.
d)
3. What is baottail?
The tapered portion of the aft section of a body is called the boattail. The purpose of
the boattail is to decrease the drag of a body which has a “squared-off” base.
4. What is base pressure?
At supersonic velocities the base of the body experiences a large negative pressure
resulting in a substantial increase in missile drag. An accurate determination of thid
base pressure co-effiecient is also quite involved since it depends in many parameters
including boattailangle,Mach number, and boattail length.
5. What are the effects of aspect ration?
The effects of increasing aspect ratio are as follows:
i) Increase cN0, CD0.
ii) Increase (L/D)max.
iii) Increase spain.
iv) Reduce wing area.
v) Increase structural area.
vi) Negligible effect on contre of pressure .
6. What are the classifications of missiles?
Most missiles can be classified into four general classes:
1. AAM- Air to Air Missiles.
2. SAM –Surface to Air Missiles.
3. ASM- Air to Surface Missiles.
4. SSM- Surface to Air Missiles.
7. What are the types of rocket dispersion?
There are two types of rocket dispersion, such as;
i. In –plane dispersion.
ii. Lateral dispersion.
8. What are the pertubing factors causing angle of attack?
a. Asymmetry of thrust force manufacturing defects in nozzle gas flow.
b. Perturbations when the rocket leaves the launcher.
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