Mechanical Switches Flashcards
What causes a bimetal switch to function?
Changes in temperature
What two ways can a mousetrap fuze be used in a hazardous device?
Electrical circuit using striker as contact and percussion type using a striker as firing pin
How does a barometric switch operate?
By a change in atmospheric pressure
What mechanical type of function is considered to be the most hazardous to the bomb technician?
Anti-disturbance
What is normally employed in a circuit containing a trembler or vibratory switch to provide an arming delay?
A clock or timer
What is the maximum delay using a minute hand on the clock? Using the hour hand?
59 min; 11 hr 59 min
Why do many clock devices misfire?
The bomber forgets to scrape insulation paint from the contacts and hands
What must be assumed if a clock is heard running in a device?
That the device is armed or fired by the clock
Why is it important that the screw does not come in contact with the face of the clock, when using the clock hand method to fire a device?
If the screw comes in contact with the face of the clock, the firing circuit would be completed
When using the clock hand method, how is the time delay changed from minutes to hours?
By removing the minute hand
