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mod 6 > 6.10 > Flashcards

6.10 Flashcards

1
Q

what are the advantages of control cables

A

strong, light weight, flexible, can be set up without backlash and high mechanical efficiency

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2
Q

what are the disadvantages of control cables

A

tension must be adjusted constantly, wear at points of contact, tension varies with temperature

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3
Q

what is a strand

A

a number of wires braided together

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4
Q

what is a cable

A

a number of strands braided together

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5
Q

what is a regular lay

A

strands and wires are twisted in opposite directions to stop uncoiling

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6
Q

what is a lang lay

A

strands twisted around a central core

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7
Q

what are the 4 common types of steel cable used

A

non flexible 1x7
non flexible 1x19
flexible 7x7
flexible 7x19

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8
Q

when are non flexible cables used

A

only for straight runs which do not pass over any pulleys

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9
Q

when is a flexible 7x7 cable used

A

for straight runs or passing over large pulleys

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10
Q

when is an extra flexible 7x19 cable used

A

when a cable must change direction over a relatively small pulley

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11
Q

what are terminal fitting generally

A

swaged

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12
Q

what are the fittings for a cable end fitting

A

threaded, fork, eye, single shank and double shank ball ends

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13
Q

what fittings are used for linkage in the system

A

threaded, fork and eye ends

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14
Q

when are the ball terminals used

A

attaching cables to quadrants and special connection where there is limited space

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15
Q

what is a lock clad cable

A

a cable that has swaged aluminium alloy tubing on the outside of the cable

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16
Q

when is a lock clad cable used

A

to eliminate sagging and when assembly passes through bulkheads

17
Q

what are the advantages of a lock clad cable

A

stretch is reduced, sag is eliminated, cable can be sealed when going through bulkheads, abrasion of outer wires is stopped, vibration is reduced

18
Q

why are turnbuckles installed

A

if there are minor adjustments needed for adjusting cable tension

19
Q

how many threads must be exposed on both sides of the turnbuckle barrel

A

3

20
Q

what must a turnbuckle be before being used

A

locked by either wire or a locking device

21
Q

what does a cable tensioning device do

A

it extends or compresses springs to make sure the tension is correct

22
Q

what are pulleys used for

A

to guide cables and change direction of cable movement

23
Q

what is attached to the structure to support the pulley

A

a bracket

24
Q

what is used to keep the cables in place on a pulley

A

guards

25
Q

what is a fairlead or grommet used for

A

preventing a cable from contacting the structure

26
Q

what motion does a control system do

A

push and pull

27
Q

what is a bell crank or quadrant used for

A

change direction of travel or control movement in a push-pull tubing system

28
Q

what is used when an angular or twisting movement is required in a control system

A

a torque tube

29
Q

what are the 2 most common flexible control systems

A

bowden cables and teleflex

30
Q

what is a bowden cable

A

an inner steel cable that can slide inside an outer housing

31
Q

what happens to bowden cables if water or contaminants get in

A

it fails to function smoothly

32
Q

what is a teleflex cable

A

a flexible transmitting cable inside a rigid metal or flexibile conduit

33
Q

what is the advantage of a flexible control system over control cables

A

it allows force to go in both directions

34
Q

how many types of teleflex cable are there

A

3

35
Q

are different types of teleflex cable interchangeable with each other

A

no they are not

36
Q

what are the different types of joint for a teleflex cable

A

single entry unit, double entry unit, straight lead unit, junction box unit, anti-torsion tube and swivel joint

mod 6 (10 decks)

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