MK 20 UBA

Question 1

surface supply max depth for MK 20 is:

Answer 1

60 fsw

Question 2

SCUBA max depth for MK 20 is:

Answer 2

190 fsw

Question 3

which MK 20 mod is positive pressure?

Answer 3

MOD 0

Question 4

which MK 20 mod is non-positive pressure?

Answer 4

MOD 1

Question 5

which MK 20 mod is good for enclosed space diving?

Answer 5

MOD 0

Question 6

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

Answer 6

MOD 0

Question 7

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

Answer 7

MOD 1

Question 8

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

Answer 8

natural rubber

Question 9

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

Answer 9

tygon tubing

Question 10

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

Answer 10

• pressure equalization assembly
• microphone
• two-way inhalation valves

Question 11

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

Answer 11

0.03 psi

Question 12

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

Answer 12

• minimum: 90 psig
• desired: 135 psig
• maximum: 135 psig

Question 13

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

Answer 13

135 psig

Question 14

who controls the MMP?

Answer 14

console operator (topside)

Question 15

MMP =

Answer 15

MMP = bottom pressure + OBP

or

MMP = (depth x 0.445) + OBP

Question 16

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

Answer 16

1.4 acfm

Question 17

MK 20 free flow mode is ____ acfm

Answer 17

8 acfm

Question 18

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

Answer 18

210 +/- 36 psig

Question 19

how long is the MK 20 hose assembly?

Answer 19

30 in

Question 20

the MK 20 hose has a rated working pressure of:

Answer 20

250 psi

Question 21

what are the two types of MK 20 communications assemblies?

Answer 21

• preamplified

- non-preamplified

Question 22

the communication adapter is used for the ___________ assembly only

Answer 22

preamplified

Question 23

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

Answer 23

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

Question 24

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

Answer 24

• first decompression stop

- surface (for no-decompression dives)

Question 25

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

Answer 25

- 135 psi | - 150 psi

Question 26

definition: dive mission

Answer 26

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

Question 27

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

Answer 27

7

Question 28

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

Answer 28

30

Question 29

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

Answer 29

30

Question 30

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

Answer 30

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

Question 31

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

Answer 31

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

Question 32

when is mission maintenance not required prior to a mission?

Answer 32

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

Question 33

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

Answer 33

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

Question 34

surface supplied max working limit for MK 20 is:

Answer 34

60 fsw

Question 35

for MK 20 a current above ____ knots requires extra weight

Answer 35

1.5 knots