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kelly bushing – вкладиш під квадратну штангу
internal combustion engines – двигуни внутрішнього згорання

Exercises

Exercise 1. Choose the correct variant
1. In the 1800s various ______________type rotary
machines were used to drill both water and oil wells.
a) engine
b) primitive
c) modern
2. The____________is an alloy steel casting on which the
ring gear and upper race of the main bearing are shrunk.
a) gear table
b) chain
c) engine
3. The ________________ is a split steel casting with API
standard driving square for the kelly bushing and slip seat.
a) rotary table
b) master bushing
c) main bearing
4. The pinion __________ consists of an alloy steel shaft
with the pinion gear shrunk on it.
a) muster bushing
b) bearing assembly
c) shaft assembly
5. Most rotaries take their power through the _________, by
means of chains and sprockets, from the primary engines.
a) bearings
b) drawworks
c) engine

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