Test 7

Question 1

What are the objectives of internal ballistics

Answer 1

Launch the projo safely
Consistant performance between shots
Acheive the highest possible muzzle velocity

Question 2

What are the four burning characteristics of propellant compositions

Answer 2

Burning rate
Pressure index
Force constant
Co-volume

Question 3

What are the six areas of distribution of energy when the gun is fired

Answer 3

1. Projectile, translational and rotation
2. Heat in the gas
3. Gun recoil
4. Driving band engraving and friction of the bore
5. Unhurt charge and gases
6. Heat in the gun

Question 4

Define pioberts law

Answer 4

The surface of a burning propellant recedes layer by layer in a direction normal to the surface

Question 5

What are the 3 types of flash reduction

Answer 5

Mussle devices
Type of propellant
Propellant additives

Question 6

What are the 4 types of ballistics

Answer 6

Internal
Intermediate
External
Terminal

Question 7

What are the propellant form functions

Answer 7

1. Positive - most degressive
2. Positive near zero - neutral
3. Near zero
4. Negative - most progressive

Question 8

What is the definition for intermediate ballistics

Answer 8

The study of the transition from internal to external ballistics that occurs in the vicinity of the muzzle

Question 9

What are the two types of gas flow fields

Answer 9

1. Precursor field

2. The main blast field

Question 10

What is in the precursurser field

Answer 10

Bottle shock
Barrel shock - sides
Mach disc - front

Question 11

What are the different types of flash

Answer 11

1. Pre-flash
2. Primary flash
3. Muzzle glow
4. Intermediate flash
5. Secondary flash

Question 12

How does a bore evacuation work

Answer 12

High pressure propellant gasses are stored in the evacuator as the round passes through the barrel. As the round exits the muzzle, the high pressure gasses flow out the muzzle. This may increase the secondary flash

Question 13

External ballistics definition

Answer 13

Google

Question 14

What is the definition of trajectory

Answer 14

Is the path taken by the centre of gravity of the projectile

Question 15

What are the main forces acting on a projectile in flight

Answer 15

Total drag
Yaw
Roll
Gravity
Velocity
Center of pressure 
Center of gravity

Question 16

How can the round to round regularity of muzzle velocity be improved

Answer 16

If burning finishes while the shell is still well back in the bore.
Increase pressure
Increase temperature

Question 17

What happens to the rate of burning of propellant if the pressure is increased

Answer 17

It increases

Question 18

What are the phases of internal ballistics.

Answer 18

1. Charge ignition
2. Combustion prior to projectile motion
3. Combustion up to the all burnt point
4. Gas flow and projectile motion after all burnt point to muzzle.

Question 19

How do muzzle devices work.

Answer 19

The work work by breaking up mach disc bottle shock

Question 20

How to over come forces acting on a projectile in flight

Answer 20

Nose shape
Base shape
Base bleed

Question 21

Two types of stability

Answer 21

Static stability

Static instability

Question 22

What are the fundamental elements of terminal ballistics

Answer 22

Kinetic energy
Projectile physical properties
Target type

Question 23

Two factors affecting projo penetration

Answer 23

Projectile velocity

Density

Question 24

What is terminal ballistics

Answer 24

The study of projectile behaviour at the target

Question 25

How does ceramic armour work

Answer 25

Ceramic armour prevents projectiles penetration by reducing the projectiles nose mass while the projectile core decelerates

Question 26

How can the round to round regulator be improved

Answer 26

The all burn point is well back in the bore