REVIEW NUMBER 3 ANSWERS

passing ship. The Mk 55 exercise mine is an inert service mine equipped with exercise components. REVIEW NUMBER 3 ANSWERS A1. The mine case contains or carries all other components. A2. The explosive components of a mine include the main charge, booster, initiating system, and auxiliary explosive devices. A3. Between 160 and 1,300 pounds of explosives are used in air-laid mines. A4. After a mine is planted, a clock-delay mechanism prevents the mine from firing until it has been submerged for a predetermined time. A5. The range of the delay time in planted air-laid mines is from 8 minutes to 10 days. A6. Influence-actuated firing mechanisms in- clude acoustic, pressure, and magnetic. A7. Acoustic mines are detonated by the sound waves generated by nearby ships' rotating screws. A8. A decrease in the water pressure immediately surrounding the mine actuates the pressure mine. A9. A change in the earth's magnetic field actuates the magnetic type of mine. Mk 62, 63, and 64 Quickstrike Mines The Mk 62, 63, and 64 (fig. 5-12) mines are air-laid, all modular, influence-actuated bottom mines. 5-12 Figure 5-12.—Mk 62, 63, and 64 quickstrike mines.