<div style='text-shadow: 0.08em 0.08em #000'>2011 North Central Regional Technician Team Exam (21-30)</div>

In order to get 100%, you must answer all of the following correctly.

21. The rule-of-thumb when altering ventilation is not to change the ventilation into an explored area.

True
False

22. A pitot tube can be inserted through a duct or tubing to measure:

23. A U-tube water gauge is a:

device for measuring water depth behind a bulkhead.
device for measuring pressure in a water line.
device for measuring elevation differences in a slope or inclined shaft.
type of differential pressure gauge.
none of the above.

24. The cross-section of an airway is determined by multiplying the width times the length.

True.
False

25. For the technician team event at a MNM mine rescue contest, extra brattice making materials, if available, should not be packed for the team.

True.
False

26. What is the standard mine rescue team map symbol for a body?

27. "Pogo sticks" are adjustable-height devices that can be quickly deployed to secure a loose roof.

True
False

28. What is the standard mine rescue team map symbol for a power center?

29. If a mine rescue team deploys an auxiliary fan and tubing to ventilate a dead-end heading, should they use rigid or collapsible tubing?

rigid
collapsible
it depends on the situation
a mine rescue team should never deploy an auxiliary fan unless directed to do so by the command center
none of the above

30. Air velocity is always measured in cubic feet per minute (for mining applications).

True
False

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•	Questions 1-10
•	Questions 11-20
•	Questions 21-30