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a) A steel brake a foot (30 centimetres) or so in diameter;
b) A steel reel 80 centimetres in diameter;
c) A steel engine;
d) a steel spool a foot (30 centimetres) or so in diameter.

14. What do the rig personnel use instead of friction cathead?
a) a carshaft;
b) air hoists;
c) air engines;
d) a supply reel.

15. For what purpose is the automatic cathead used?
a) to absorb the momentum created by the load being raised or lowered;
b) to provide the driller a way of slowing and stopping the drum;
c) to make up or break out the drill string when running it into or pulling it from
the hole;
d) produce electricity that flows through cables to electric switch and control
equipment enclosed in a control cabinet.

16. What is the diameter of the drilling line?
a) from 50 to 71 millimetres;
b) from 32 to 51 millimetres;
c) from 22 to 51 millimetres;
d) from 12 to 21 millimetres.

17. From the deadline anchor, the drilling line runs up to:
a) the top of the mast or derrick to a set of large pulleys;
b) the top of the engine;
c) to the top of the hoist;
d) to the top of the main and auxiliary brake.

18. What is the diameter of the sheaves around which the drilling line passes?
a) 10 feet or more in diameter;
b) 15 feet or more in diameter;
c) 5 feet or more in diameter;
d) 20 feet or more in diameter

19. What is the diameter of the pins on which the sheaves rotate?
a) 10 foot or so in diameter;
b) 5 foot or so in diameter;
c) 15 foot or so in diameter;
d) 1 foot or so in diameter.

20. Manufacturers have to make masts:
a) strong and portable;

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