Mechanical Action Fuzing(switches)

Question 1

What is the definition of a mechanical fuse

Answer 1

Any mechanical mechanism that is employed in a hazardous device and requires physical action or force to take place in order for the device to function

Question 2

What is the definition of a mechanism

Answer 2

The means by which an affect is produced or accomplished or the mechanical aspect in other words. Typed by function

Question 3

What is an organic safety

Answer 3

A designed safety block or pin that comes with the component to prevent initiation action. This is built in the device and general provided by the manufacturer

Question 4

What is a positive safety

Answer 4

A blocking material pinning or securing the component to positively prevent the final initiating action. This action is generally done forward if the firing pin and behind the primer

Question 5

What are the 2 switch categories

Answer 5

Maintained contact

Momentary contact

Question 6

What is the definition of normally open and normally closed switches

Answer 6

The normal state of rest for the switch with no outside influence

Question 7

What is the definition of safe arm or safe operation switch

Answer 7

A switch which allows for a person to safely set the device and arm it without being there or disturbing the device during the final arming sequence

Question 8

What is the definition of the arming functioning switch

Answer 8

It is the switch which actually “arms” or activated the device so it is ready to function when triggered

Question 9

What must be done prior to cutting any trip wire

Answer 9

You must trace both ends of the wire, then find and block the triggering device

Question 10

Do you ever shoot a switch

Answer 10

No! Shooting a switch may cause the device to function

Question 11

What is the definition of a mechanical switch

Answer 11

A device changing the course of flow in a circuit or cause a non-electric action to occur so as to function the device

Question 12

How do barometric switches function

Answer 12

By detecting changes in air pressure or altitude

Question 13

How does a bi-metal switch function

Answer 13

By detecting changes in ambient temperature

Question 14

What is a door knob switch

Answer 14

A device that is attached to a door knob and activates when the door knob is turned

Question 15

What type of switches are used for anti-disturbance or anti-tampering (4)

Answer 15

Mercury switch
Tilt switch
Vibratory switch
Ball switch

Question 16

What are the 4 types of times delay switches

Answer 16

Mechanical
Chemical
Material fatigue
Other ( Ice, wax, beans etc)

Question 17

What 2 functions can a time delay be utilized

Answer 17

To function the device

To activate the device

Question 18

What types of clocks are examples of mechanical delay(3)

Answer 18

Alarm activated
Spring tension
Electric

Question 19

How does an M-1 chemical time delay pencil function

Answer 19

An ampule of acid is broken in the rear of the device and begins to dissolve the retaining wire until it breaks by material fatigue releasing the firing pin which strikes a primer cap

Question 20

What soluble substances are used in a soluble clothes pin switch

Answer 20

Wax

Aspirin

Question 21

Which type of switch is most hazardous for a bomb tech

Answer 21

Anti-disturbance (Mercury, trembler, vapor, vibratory)

Question 22

What is normally employed in a circuit containing a trembler or vibratory switch to provide an arming delay

Answer 22

A clock or timer safe arm switch

Question 23

What could prevent a clock from functioning a device

Answer 23

Paint or coating on the hands, lack of power, or forgetting to wind the clock

Question 24

What is the maximum time delay for a minute hand clock

Answer 24

59 min

Question 25

What is the maximum delay using the hour hand on a clock

Answer 25

11hr 59min

Question 26

Why is it important that the screw doesn’t come into contact with the face of the clock when using the clock hand method to fire the device

Answer 26

If the screw comes into contact with the clock face the circuit would be completed

Question 27

What must be assumed if a clock is heard running in a device

Answer 27

The device is either armed or fired by a clock

Question 28

What type of device is a chemical pencil

Answer 28

Chemical delay

Question 29

What are the considerations when dealing with grenade fuses

Answer 29

Booby traps
Shirt spoons
Hung cock striker

Question 30

What switch has 2 balls and is sealed in a small metal container with inert gas

Answer 30

Vapor switch (ball switch)

Question 31

What tilt switch when X-rayed has a very dense material in it

Answer 31

Mercury switch

Question 32

What type of switch may you have if you see two wires floating in free space in an x-ray

Answer 32

Foil switch

Question 33

What switch is primarily made of two wires

Answer 33

Loop switch

Question 34

Examples of commercially available switch (10)

Answer 34

Toggle switch
Slide 
Relay
Vapor 
Knife 
Micro 
Mercury 
Trembler 
Reed
Keyboard

Question 35

Examples of improvised switches (8)

Answer 35

Clothes pin 
Loop 
Pressure 
Foil
Tilt
Knife
Float switch (water float timer)
Mouse trap (shoot at the bale w/pan to stop final action)

Question 36

What 2 types of switch functions can a clothes pin produce

Answer 36

Pressure

Pressure release

Question 37

A knife switch can be set up in what 2 configurations

Answer 37

Pull switch

Tension release switch