Tech Grade 8 Question Preview (ID: 42468)
Tech.
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What is the purpose of an idler gear in a gear system?
a) An idler gear is a gear wheel placed between two other gear wheels to synchronise their direction of rotation.
b) Gear wheels for movement
c) Idler gear wont' allow movement
d) Gear system needs to stay stationery
Which gear system from the two below would you recommend for a person who wants to ascend a steep slope with ease?. Explain the reasons for your choice.
a) Gear system 1
b) The driven gear is larger than the driver gear
c) that makes the system to have less input force than the output force.
d) All of the above
Calculate the gear ratio of the gear system with a driven gear that has 105 teeth and a driver gear that has 15 teeth. Use the formula : Gear Ratio = Number of teeth on driven gear ÷ Number of gears on the driver gear
a) Gear Ratio = Number of teeth on driven gear ÷ Number of gears on the driver gear
b) =105/15 = 7/1 =7:1
c) None
d) No. 1 and 2
Give TWO examples where a crank mechanism is used.
a) A cam is used with a follower
b) and is driven by an axle so that when the axle rotates the cam rotates
c) When the cam rotates, the follower slides on the cam
d) All of the above
Give TWO examples where a crank mechanism is used.
a) The shape of the cam will make the follower to reciprocate
b) Cranck will reciprocate
c) Crank device
d) Neither
Give TWO examples where a crank mechanism is used.
a) Coffee maker
b) eggbeater
c) Hand drill
d) No. 2 and 3
A pair of scissors with the fulcrum in the middle of the blades and handles
a) will reduce mechanical advantage
b) will not have mechanical advantage.
c) will increase mechanical advantage
d) neither
A king post..
a) is attached to a tie beam.
b) can span very long distances.
c) is a common form of roof truss.
d) has vertical beams that are evenly spaced.
What effect does a shear force has on a structural members?
a) A pulling effect.
b) A pushing effect.
c) A twisting effect.
d) A sliding effect.
Single second-class levers is used to
a) give a mechanical advantage.
b) increase the speed.
c) increase the applied force.
d) do all of the above.
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