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