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Systems and control
Which of these are levers used for?
Levers are used for applying a force.
Levers are used for changing the amount of force.
Levers are used for changing the direction of movement.
Levers are used for changing the amount of movement.
Levers are used for all of the above.
What class of lever is a wheelbarrow?
How is the velocity ratio of a lever calculated?
Distance divided by load
Effort multiplied by load
Load divided by effort
Distance moved by load multiplied by distance moved by effort
Distance moved by effort divided by distance moved by load
A load of 600N is moved by an effort of 200N. What is the mechanical advantage?
Linkages can be used to change:
The direction of motion
The type of motion
The size of a force
All of the above.
A bicycle breaking system is an example of a reverse-motion linkage: true or false?
Windscreen wipers are an example of a treadle linkage: true or false?
A cam mechanism has three basic parts: cam, slide and follower: true or false?
What type of cam is required to make the follower dwell for half the cycle, then rise and fall smoothly?
An eccentric cam
A snail cam
A pear-shaped cam
A dwelling cam
A drop cam
A number of gears connected together are called a what?
The input, perhaps a motor, is connected to the what?
What type of gears change the direction of rotary motion by 90 degrees?
Compound gear trains
Worm gears or bevel gears
Compound gear trains or worm gears
A pulley system has two pulley wheels. The driven wheel is 90mm wide and the driver wheel is 30mm wide. What is the velocity ratio?
What type of motion is a pendulum in a clock?
Which of the mechanisms listed below would be used to change linear motion to rotary motion, or rotary to linear?
Wheel and axle
Rack and pinion
Rope and pulley
Chain and sprocket
Any of the above
An open driving belt will cause two pulleys to turn in the same direction. What effect will a crossed driving belt have on two pulleys?
A crossed driving belt will cause two pulleys to turn in opposite directions
A crossed driving belt will cause two pulleys to turn in the same direction.
A crossed driving belt will cause two pulleys to cancel each other out.