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NDSTC > MK 20 UBA > Flashcards

MK 20 UBA Flashcards

1
Q

surface supply max depth for MK 20 is:

A

60 fsw

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2
Q

SCUBA max depth for MK 20 is:

A

190 fsw

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3
Q

which MK 20 mod is positive pressure?

A

MOD 0

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4
Q

which MK 20 mod is non-positive pressure?

A

MOD 1

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5
Q

which MK 20 mod is good for enclosed space diving?

A

MOD 0

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6
Q

which MK 20 mod is good for category 3 contaminated water?

A

MOD 0

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7
Q

which MK 20 mod is good for when you have a limited air supply?

A

MOD 1

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8
Q

what is the required material for the face mask when diving in contaminated water?

A

natural rubber

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9
Q

what is used to achieve a proper seal on the mask body assembly?

A

tygon tubing

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10
Q

the inner oral-nasal mask is made up of what components?

A
  • pressure equalization assembly
  • microphone
  • two-way inhalation valves
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11
Q

the MK 20 MOD 0 second stage regulator is capable of maintaining a slight positive pressure in the FFM of approximately _____ psi

A

0.03 psi

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12
Q

what are the minimum / desired / maximum OBP operating limits for MK 20 surface supply?

A
  • minimum: 90 psig
  • desired: 135 psig
  • maximum: 135 psig
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13
Q

for MK 20 SCUBA mode, the OBP is set to the manufacturer’s recommended pressure, but not lower than ______

A

135 psig

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14
Q

who controls the MMP?

A

console operator (topside)

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15
Q

MMP =

A

MMP = bottom pressure + OBP

or

MMP = (depth x 0.445) + OBP

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16
Q

the air supply system for MK 20 must be able to provide an average sustained flow of ____ acfm to divers

A

1.4 acfm

17
Q

MK 20 free flow mode is ____ acfm

A

8 acfm

18
Q

the MK 20 regulator has a built-in relief valve that will lift at _____ +/- ____ psig and reset at 10 psig below set pressure

A

210 +/- 36 psig

19
Q

how long is the MK 20 hose assembly?

A

30 in

20
Q

the MK 20 hose has a rated working pressure of:

A

250 psi

21
Q

what are the two types of MK 20 communications assemblies?

A
  • preamplified

- non-preamplified

22
Q

the communication adapter is used for the ___________ assembly only

A

preamplified

23
Q

what functional tests can be performed with the mini test kit?

A
  • check valve sealing
  • leak check
  • automatic positive pressure
  • exhalation resistance without positive pressure
  • water tightness
  • airflow capacity
24
Q

an adequately charged SCUBA cylinder is defined as the pressure that provides sufficient air to bring the diver to his ______________ or __________

A
  • first decompression stop

- surface (for no-decompression dives)

25
Q

EGS OBP is set to ____ psi if submerged and ___ psi if topside

A
  • 135 psi

- 150 psi

26
Q

definition: dive mission

A

period of time during which the equipment is in continuous daily use

27
Q

a MK 20 dive mission is considered complete if there is a break in service of ___ days or more

A

7

28
Q

an extended MK 20 dive mission is one that exceeds ____ days without any break in service of 7 days or more

A

30

29
Q

during extended dive missions, mission maintenance must be performed every ____ days

A

30

30
Q

T/F: mission maintenance is required at the end of every dive mission as well as before a dive mission

A

FALSE: mission maintenance is required at the end of every dive mission but is no longer required before a dive mission unless certain conditions are met

31
Q

mission maintenance is required prior to a mission only if one of which conditions apply?

A
  1. equipment has never been used
  2. equipment has been idle for more than 18 months
  3. condition of equipment is suspect (humidity)
32
Q

when is mission maintenance not required prior to a mission?

A

if FFM has been idle for 18 months or less and bears a tag that certifies sat completion of the full maintenance procedure within the last 18 months

33
Q

mission maintenance required at the END of every mission and when which conditions apply?

A
  1. diving supervisor anticipates immediate break in service of 7 days or more
  2. 30 day milestone is reached during extended dive mission
  3. condition of equipment is suspect
34
Q

surface supplied max working limit for MK 20 is:

A

60 fsw

35
Q

for MK 20 a current above ____ knots requires extra weight

A

1.5 knots

NDSTC (9 decks)

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