4-49.
Magnetic, acoustic, and pressure
mines are grouped into which of the
following general classifications?
1.
Influence only
2.
Contact only
3.
Influence and contact
4.
Pressure and magnetic
4-50.
Mine cases may be made of which of
the following materials?
1.
Sheet metal only
2.
Aluminum only
3.
Spun glass only
4.
Sheet metal, aluminum, or spun
glass
4-51.
The amount of explosives used in
air-laid mines ranges from 160
pounds to what maximum number of
pounds ?
1.
1,300 lb
2.
1,500 lb
3.
1,700 lb
4.
1,900 lb
4-52.
Depending on the type of mine, the
explosive system may contain which
of the following components?
1.
A booster only
2.
A main charge only
3.
An initiating system only
4.
A booster, a main charge, and
an initiating system
4-53.
Air-laid mines contain which of the
following types of explosives?
1.
HBX, Comp B, H6, or TNT
2.
Comp B, TNT, RDX or tritonal
3.
Comp B, TNT, H6, or RDX
4.
TNT, H6, tritonal, or BOOM I
4-54.
In an air-laid mine, what device
opens a hole in the mine case,
causing the mine to sink?
1.
A booster
2.
A main charge
3.
An initiating system
4.
An auxiliary explosive
4-55.
The arming device in an air-laid
mine consist of what type of (a)
switch piston and (b) aligning
piston?
1.
(a) Electrical (b) mechanical
2.
(a) Hydrostatic (b) explosive
3.
(a) Electrical (b) explosive
4.
(a) Hydrostatic (b) mechanical
4-56.
In an air-laid mine, what component
prevents firing until the mine has
been submerged for a predetermined
period of time?
1.
The hydrostatic switch piston
2.
The explosive aligning piston
3.
The clock-delay mechanism
4.
The mechanical time-delay fuze
4-57.
What time delay range can be
programmed into a clock-delay
mechanism?
1.
6 min to 8 days
2.
8 min to 10 days
3.
10 min to 12 days
4.
12 min to 14 days
4-58.
What type of firing mechanism
detects the sound waves generated
by nearby ships?
1.
Pressure
2.
Acoustic
3.
Magnetic
4.
Contact
4-59.
What type of firing mechanism is
actuated by a decrease in the water
pressure surrounding the mine?
1.
Pressure
2.
Acoustic
3.
Contact
4.
Depth
4-60.
What type of parachute pack is used
to release a mine from an aircraft
that is flying at a high altitude?
1.
Large
2.
Quick-release
3.
Small
4.
Delayed-opening
4-61.
When a mine is released with a
parachute installed, the parachute
is deployed by what means?
1.
The airstream
2.
The parachute release band
3.
The removal of the arming wire
4.
The firing of an explosive
fitting
4-62.
A Mk 55 service mine is classified
as what type of mine?
1.
A moored mine
2.
A bottom mine
3.
A surface mine
4.
A floating mine
21
