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WorksheetsAR 1.6 - Time to Switch Gears
Total questions: 44
Worksheet time: 22mins
If you want to lift a heavy object with a motor, how should you adjust the gears to increase torque?
Use a larger output gear
Use a smaller output gear
Use the same size input and output gears
If a driving gear has 60 teeth and the driven gear has 20 teeth, what is the gear ratio based on the number of teeth?
1:3
3:1
1:1
1:2
A gear train consists of a driving gear with 48 teeth and a driven gear with 24 teeth. What can you conclude about the gear ratio?
The gear ratio is 1:2
The gear ratio is 2:1
The gear ratio is 1:1
The gear ratio is 3:2
In a gear train, if the driving gear has 50 teeth and the driven gear has 25 teeth, what is the gear ratio based on the number of teeth?
1:2
2:1
1:1
5:1
What does a gear ratio compare in a gear system?
The number of rotations between the driving and driven gears
The torque of the entire system
The size of the gears
The speed of the smallest gear compared to the size of the entire structure
In a gear system, if the driving gear rotates faster than the driven gear, what is most likely true?
The driven gear is larger
The driven gear is smaller
The gears are the same size
The driving gear has more teeth
What conclusion can be drawn about the relationship between speed and torque in a gear train?
Speed and torque are inversely related
Speed and torque are directly related
Speed increases torque without any changes
Torque only changes with the motor size
In a system where the output gear is smaller than the input gear, what will likely happen to the output torque?
The output torque will decrease
The output torque will increase
The output torque will stay the same
The output torque will double
What would happen to the torque if the number of teeth on the input gear is 60 and the number of teeth on the output gear is 24?
The torque will decrease
The torque will increase
The torque will stay the same
The torque will reverse
Imagine a robotic arm build with a motor but no gear train. Why would it not be able to lift the heavy arm?
The motor does not have enough torque
The motor does not have enough speed
The motor is not connected properly
The motor’s gears are too small
Which of the following best describes the relationship between speed and torque in a gear system?
Speed increases as torque decreases
Speed and torque both increase together
Speed and torque both decrease together
Torque stays the same while speed changes
If the driving gear has 24 teeth and the driven gear has 48 teeth, what will happen to the output torque?
It will increase
It will decrease
It will stay the same
It will reverse
In a system where the output gear turns slower than the input gear, what happens to the torque?
The torque increases
The torque decreases
The torque stays the same
The torque doubles
What happens to the torque when the output gear is larger than the input gear in a gear train?
The torque increases
The torque decreases
The torque stays the same
The torque reverses direction
If you are calculating the gear ratio based on the number of teeth, what would be the correct setup for a driving gear with 40 teeth and a driven gear with 20 teeth?
20:40
40:20
40:40
1:1
Which of the following correctly describes the difference in calculating gear ratios based on rotations and teeth?
The gear in the numerator and denominator is reversed for rotations versus teeth
Both methods place the driving gear in the denominator
The number of teeth method always gives a higher ratio than the rotation method
The rotation method places the larger gear in the numerator
When calculating the gear ratio based on the number of rotations, which gear is placed in the numerator?
The driving gear
The gear with the most rotations
The driven gear
The gear with the least rotations
When calculating the gear ratio based on the number of teeth, which gear is placed in the numerator?
The driven gear
The larger gear
The smaller gear
The driving gear
If the driven gear has more teeth than the driving gear, what happens to the output speed?
Output speed decreases
Output speed increases
Output speed stays the same
Output speed fluctuates randomly
What is the relationship between the size of a gear and the number of teeth it has?
Larger gears have more teeth
Larger gears have fewer teeth
Gear size and number of teeth are unrelated
Smaller gears always have more teeth
How is the size of a gear typically measured?
By the number of teeth it has
By its weight
By its diameter
By the speed it rotates
In a gear train with a gear ratio of 7:3, what is the effect on the output speed (the driven gear on the right side of the gear train)?
The output speed decreases
The output speed increases
The output speed stays the same
The output speed is halved
For a gear train with a gear ratio of 3:5, what happens to the output speed (on the right side) compared to the input speed (on the left side of the gear train)?
The output speed increases
The output speed decreases
The output speed stays the same
The output speed doubles
A gear train has a gear ratio of 3:1. How does the output speed (on the right) change compared to the input speed (on the left side of the gear train)?
The output speed decreases
The output speed increases
The output speed stays the same
The output speed reverses
In a gear train with a gear ratio of 1:1 with the driving gear on the left side, how does the output speed compare to the input speed?
The output speed stays the same
The output speed increases
The output speed decreases
The output speed fluctuates
If a gear ratio is 3:1, what does this mean about the driving and driven gears?
The driving gear rotates three times for every one rotation of the driven gear
The driving gear is three times larger than the driven gear
Both gears rotate at the same speed
The driven gear rotates three times for every one rotation of the driving gear
What is the purpose of calculating a gear ratio?
To determine the speed or torque of a gear system
To change the color of the gears
To calculate the total number of teeth on all gears
To measure the weight of each gear
If the driving gear rotates 100 times and the driven gear rotates 25 times, what is the gear ratio?
4:1
1:4
2:1
1:2
How is a gear ratio written?
As the number of rotations of the driving gear divided by the number of rotations of the driven gear.
As the number of rotations of the driven gear divided by the number of rotations of the driving gear
As the size of the gears divided by the speed of the system
As the number of teeth divided by the number of gears
Which of the following ratios is equivalent to 1:4?
2:8
4:1
3:6
5:5
How can a ratio be expressed mathematically?
As a fraction
As a multiplication sign
As a decimal
As an equation
Which of the following is an example of a ratio?
4:1
3 miles
60 minutes
100 rpm
What is the primary reason engineers use gear ratios in designing machines?
To calculate how gears affect speed and force
To determine the shape of the gears
To align the gears perfectly
To determine the best material for the gears
If a system requires a driven gear to rotate at 120 rpm and the driving gear rotates at 60 rpm, what gear ratio is needed?
1:2
2:1
1:1
3:1
If the gear ratio is 3:1, what can you conclude about the rotations of the driving and driven gears?
The driving gear rotates three times for every one rotation of the driven gear.
The driven gear rotates three times for every one rotation of the driving gear.
The driven gear rotates slower than the driving gear.
The driven gear rotates at the same speed as the driving gear.
A gear turns 6,000 times in an hour. What is its speed in revolutions per minute (rpm)?
100 rpm
10 rpm
60 rpm
30 rpm
What is the gear ratio when the driving gear rotates 40 times and the driven gear rotates 80 times?
1:2
2:1
4:1
1:1
If a driving gear rotates 60 times per minute and a driven gear rotates 30 times per minute, what is the gear ratio?
2:1
1:2
3:1
1:1
What does a gear ratio compare?
The number of rotations of two gears
The weight of two gears
The color of two gears
The shape of two gears
What is the first step in calculating the gear ratio?
Identify the input and the output of the mechanism
Simplify the fraction
List the number of teeth of the INPUT gear
List the number of teeth of the OUTPUT gear
What is the second step in calculating the gear ratio?
Count the number of teeth on the input and output gears
Simplify the fraction
Identify the input and the output of the mechanism
Put the number of teeth into the ratio
What is the third step in calculating the gear ratio?
Put the number of teeth into the ratio, listing the output teeth first, then the input.
Simplify the fraction
Identify the input and the output of the mechanism.
Count the number of teeth on both the input and output gears.
Which two gear ratios have increased torque?
9:4 and 4:5
8:3 and 9:4
3:8 and 4:9
8:3 and 4:9
Which ratio has a higher increased speed?
1:4
4:5
