Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

AT Course_NE > Test 6 - Fuzes > Flashcards

Test 6 - Fuzes Flashcards

1
Q

Define Fuze:

A

A fuze is a device designed to function an item of ammunition under pre-determined circumstances

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

3 Classifications of Fuzes:

A
  • Filling
  • Position
  • Function
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q 
Define the following:
PD
BD
PIBD
T
CT
MT
VT
CVT
SQ
DLY
MTSQ
TSQ
PDSQ
MO
ET
A 
Point Detonating
Base Detonating
Point Initiating Base Detonating
Time
Combustion Time
Mech Time
Variable Time
Controlled Variable Time
Super Quick
Delay
Mech Time Super Quick
Time Super Quick
Point Detonating Super Quick
Multi Option
Electronic Time
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

2 General Requirements of Fuzes:

A
  • Safety
    • For storage and Transport
    • Against Premature functioning
  • Reliability
    • To high order when required
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

One of the other requirements of a fuse is that it fits the fuse cavity, name five more?

A 
E - Easy time adjustments/setting
O - Optional delay setting
M - Must fit standard cavity sizes
M - Minimum preparation for use
M - Multi role to minimise refusing
S - Standard weight
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

One mechanical device is a Shutter, name three more.

A 
Delay arming shutter
Masking (delay or non delay)
Horse head segments
Bore riding pin
Centrifugal balls
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Explain when a fuse is armed/What is the process of arming?

A

A fuse is armed when it has gone through all of it’s firing forces and the explosive train is inline.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Explain the following:

  • Setback
  • Stored energy
  • Creep forward
  • Centrifugal force
  • Set forward
  • Spin decay
  • Air/gas pressure
A
  • Setback - Rearward Momemtum caused by rapid acceleration forces
  • Stored energy - energy ready to be released (spring under tension)
  • Creep forward - After setback and the momentum starts to decelerate, moving parts return to a forward position
  • Centrifugal force - momentum moves outwards due to a rapid spinning motion
  • Set forward - Forward Momentum caused by violent deceleration on impact
  • Spin decay - decrease in angular velocity
  • Air/gas pressure - used to drive a turbine to generate power in electrically operated fuses
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the four Impact fuse actions?

A
  • Super quick
  • Non delay
  • Graze
  • Delay
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the categories of impact fuses?

A
  • PD
  • BD
  • PIBD
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How does graze sensitive work?

A

Functioned when checked in flight or receives appreciable deceleration, the inertia pellet moves forward to carry the detonator on to the striker or vice versa.
A creep spring keeps the two apart. The detonator is a flash type and the fuse has a small delay.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are boosters made of and what are they for?

A

CE pellet

Carries the explosive wave from the detonator and transfers it to the main fill

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the three types of time fuses?

A
  • Combustion time
  • Mechanical time
  • Electronic time
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the three types of mechanical time fuses?

A
  • THIEL - British MT Fuzes
  • JUNGHANS - American MT Fuzes
  • DIXI - Swiss Fuze
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Differences between VT and CVT?

A
  • Variable time - were unreliable due to premature functioning as they did not contain arming delay mechanisms
  • Controlled variable time - incorporate a clockwork mechanism which prevents the VT element from functioning except during that portion of the trajectory which is close to the target
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Two of the design considerations for a proximity fuse are:
- Sensitive and rapid in operation
- Not subject to false operation
Name three more.

A
  • Rugged
  • Able to function in all conditions
  • Lightweight
  • Economical
  • Able to fit existing projectiles
  • Not easily jammed
  • Safe to handle
  • Have good storage characteristics
17
Q

Describe the Doppler effect.

A
  • Radio waves are emitted by the fuze, some of the waves are reflected and picked up by the receiver
  • The time taken to return affects the reflected waves, which interfere with the radiated waves to give a beat known as the Doppler effect
  • As the Fuze gets closer to the set target distance the impulses increase to a defined peak value and the fuze functions
18
Q

8 Other Components of Fuzes?

A 
P - Pellets
P - Protective Cover/Cap
S - Striker Cover
S - Safety Cap
D - Detonators
D - Delay Systems
B - Booster or Magazine
C - Channel
19
Q

3 Advantages of Electronic Fuzes:

A
  • Lowers costs due to multi role function
  • Versatility in arming
  • Mechanical Preparation or initiation
20
Q

2 Categories of Masking Devices?

A
  • Delay

- Non-Delay

21
Q

What are time fuzes designed to do?

A

Function after a predetermined time whilst in flight.

22
Q

How are time fuzes set for time prior to loading? (4)

A

R - Rotation
U - Use of a moving portion of fuze with fuze key
F - Fuze setter
F - Fuze setting machine

23
Q

3 Types of Time Fuzes?

A
  • Combustion (T)- Powder Train Time Fuze (PTTF)
  • Mechanical (MT)
  • Electronic (ET)
24
Q

7 Forces Available to act upon fuzes + quick explanation of each?

A
  • Set-back
  • Creep Forward
  • Centrifugal Force
  • Spin Decay
  • Set Forward
  • Air or Gas Pressure
  • Stored Energy
25
Q

What is a bore riding pin?

A

A pin that rides inside the bore and when the item leaves the bore the pin ejects by spring tension and the explosive train is aligned

26
Q

What is an inertia pellet?

A

A heavy weight that carries the detonator on rapid deceleration into the firing pin

27
Q

3 Sections of the Prox Fuze?

A
  • Nose
  • Steel Base
  • Sleeve
28
Q

2 Groups of Proximity Fuzes

A

VT

CVT

29
Q

Define Proximity Fuzes?

A

An automatic time fuze with or without PD element designed to function at the optimum lethal distance from target.

30
Q

What are the safety features for mechanical fuzes?

A
  • Cannot be assembled in unsafe condition

- Safety arrangements can be checked during and after assembly

31
Q

Types of Shutters? (2)

A
  • Sliding Shutter

- Rotating Shutter

32
Q

What are the 4 power sources for Elec Fuzes?

A
  • Battery
  • Turbine Generated
  • Pre-charged
  • Electro static
33
Q

Settings for MO Fuzes? (4)

A
  • Delay
  • Prox
  • Near Surface Burst
  • SuperQuick

AT Course_NE (23 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions