E4

Question 1

In addition to the flag alpha, what shapes could a diving vessel display during daylight hours if she is restricted in her ability to manoeuvre?

Answer 1

circle, diamond, circle - VERTICAL

Question 2

Which of the following is NOT a danger specifically associated with gas mixtures supplied in cylinders / quads from a major gas supply company?

Answer 2

co toxicity

Question 3

What is the most likely cause of an outboard engine faltering, coughing and then stopping?

Answer 3

no fuel

Question 4

Whilst engaged in diving at night, a vessel may additionally display 2 green lights on one side and two red lights on the other side. What does this signify?

Answer 4

Pass on the green side, keep clear of the red side

Question 5

If a 20kg lift bag was fully inflated with air at 30m, how much free air would spill out of it as it was lifted to the surface

Answer 5

60litres
(80litres- 20 = 60)

Question 6

Approximately what speed does sound travel underwater?

Answer 6

4.4 times faster

Question 7

Which of the following most accurately describes the composition of Air?

Answer 7

a complete mixture of gases manily nitrogen

Question 8

If you wanted to send your tender the signal lower which of the following signals would you send?
Select one:

a.
2 bells

b.
3 bells

c.
4 bells

d.
5 bells

e.
Succession of 2 bells

Answer 8

3 bells