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Tech Grade 8
Test Description: Tech
Instructions: Answer all questions to get your test result.
1) What is the purpose of an idler gear in a gear system?
A
Gear wheels for movement
B
Gear system needs to stay stationery
C
Idler gear wont' allow movement
D
An idler gear is a gear wheel placed between two other gear wheels to synchronise their direction of rotation.
2) 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
that makes the system to have less input force than the output force.
C
The driven gear is larger than the driver gear
D
All of the above
3) 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
None
C
=105/15 = 7/1 =7:1
D
No. 1 and 2
4) Give TWO examples where a crank mechanism is used.
A
When the cam rotates, the follower slides on the cam
B
All of the above
C
A cam is used with a follower
D
and is driven by an axle so that when the axle rotates the cam rotates
5) Give TWO examples where a crank mechanism is used.
A
Neither
B
The shape of the cam will make the follower to reciprocate
C
Crank device
D
Cranck will reciprocate
6) Give TWO examples where a crank mechanism is used.
A
No. 2 and 3
B
Coffee maker
C
eggbeater
D
Hand drill
7) A pair of scissors with the fulcrum in the middle of the blades and handles
A
neither
B
will not have mechanical advantage.
C
will reduce mechanical advantage
D
will increase mechanical advantage
8) A king post..
A
has vertical beams that are evenly spaced.
B
can span very long distances.
C
is attached to a tie beam.
D
is a common form of roof truss.
9) What effect does a shear force has on a structural members?
A
A twisting effect.
B
A pushing effect.
C
A pulling effect.
D
A sliding effect.
10) Single second-class levers is used to
A
give a mechanical advantage.
B
increase the speed.
C
do all of the above.
D
increase the applied force.
*select an answer for all questions
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