Smokeboat Quiz #46

Torpedo Tubes - Part 4.

1) On torpedoes that are electrically set, the:
a) gyro spindles must still be used
b) depth and speed spindles must still be used
c) impulse air is not needed
d) gyro spindles are kept retracted

 

3) The transfer switch is shifted from 'Emergency power' to Normal power:
a) by pulling the silent fire handle inboard
b) by pulling the hand fire handle inboard
c) by pressing the firing switch
d) when the ready to fire interlock is lowered

 

5) In the silent fire method:
a) it is not necessary to equalize tube pressure
b) the stop bolt is retracted by hand
c) ships service air is used to fire the tube
d) only '21' inch torpedoes can be fired by this method

 

7) Regarding runout firing:
a) the stop bolt is raised manually
b) only '21' inch torpedoes are fired by this method
c) it is the quietest method of firing
d) the firing valve does not open

 

9) To shift the tube from normal fire to water slug, it is necessary to:
a) position the selector valve to the water slug position in order to isolate the impulse air from the poppet valve operating unit
b) position the selector valve to allow impulse air to act against the valve plunger of the poppet valve operating unit
c) isolate the torpedo stop cylinder pilot valve from impulse pressure with the selector valve
d) put the lifting cup loading valve in the water slug position
2) Liquid is used in the firing valve because:
a) tube pressure would be too low if there was no liquid
b) the liquid acts as a throttling force
c) the liquid forms an air seal
d) the liquid causes the valve to open faster

 

4) In electrical or hand fire the stop bolt is lifted upon firing by:
a) the moving of the hand retraction lever
b) air moving the torpedo stop cylinder
c) interlock drive shaft
d) the stop cylinder spring

 

6) The breech door is shut but the drain valve interlock will not raise.  The reason is the:
a) ready to fire lever is not raised
b) drain valve is open
c) muzzle door is open
d) semi-circular lug is not installed

 

8) The major interlock sections on a torpedo tube are the:
a) firing mechanisms, breech and muzzle door, and power operation
b) breech and muzzle door, torpedo run and firing time
c) muzzle door open, muzzle door shut, and drain valve locked shut
d) firing mechanisms, breech and muzzle door, and tube drain and muzzle door

 

10) The action which takes place when a tube is fired is ______ , and allows impulse air to enter the tube through the water check valve.
a) ships service air enters the stop cylinder piston, moving stop rod breechward, retracting gyro spindle, lifting stop bolt, knock pilot valve off its seat, which vents air off the top of firing valve
b) ships service air enters the stop cylinder piston, moving stop rod breechward, retracting gyro spindle, knock pilot valve off its seat, which vents air off the top of firing valve
c) ships service air enters the stop cylinder piston, moving stop rod muzzleward, retracting gyro spindle, lifting stop bolt, knock pilot valve off its seat, which vents air off the top of firing valve
d) ships service air enters the stop cylinder piston, moving stop rod muzzleward, retracting gyro spindle,  knock pilot valve off its seat, which vents air off the top of firing valve

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