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Worksheets

Gear Ratios and Mechanisms

Total questions: 100

Worksheet time: 4hrs 38mins

Name
Class
Date
1.

In a simple gear train, which component is considered the output gear?

a)

The Idler Gear

b)

The Driven Gear

c)

The Input Gear

d)

The Driving Gear

2.

In a simple gear train, which component is considered the input gear?

a)

The Driven Gear

b)

The Driving Gear

c)

The Output Gear

d)

The Idler Gear

3.

What is the primary purpose of an idler gear in a simple gear train?

a)

To transmit motion over a long distance.

b)

To increase the gear ratio (speed).

c)

To change the direction of rotation of the output gear.

d)

To increase the torque ratio.

4.

A driving gear has 40 teeth and a driven gear has 20 teeth. What is the gear ratio?

a)

1:2

b)

2:1

c)

40:20

d)

20:40

5.

What is the gear ratio if the driven gear has 60 teeth and the driving gear has 15 teeth?

a)

16:40

b)

1:4

c)

4:1

d)

60:15

6.

A simple gear train has an input gear with 10 teeth and an output gear with 50 teeth. What is the simplified gear ratio?

a)

1:10

b)

5:1

c)

10:5

d)

1:5

7.

The driven gear has 75 teeth and the driver gear has 25 teeth. Calculate the gear ratio.

a)

3:1

b)

1:3

c)

75:25

d)

26:15

8.

If the driving gear has 18 teeth and the driven gear has 9 teeth, what is the gear ratio?

a)

3:1

b)

2:1

c)

01:03:00

d)

01:02:00

9.

A worm and wheel has a 50-tooth wheel and a single-start worm. What is the gear ratio?

a)

50:2

b)

1:50

c)

50:1

d)

1:25

10.

Driver: 30 teeth, Driven: 90 teeth. Gear Ratio is:

a)

1:3

b)

3:1

c)

30:90

d)

90:30

11.

Output gear (100 teeth) is driven by input gear (25 teeth). Ratio is:

a)

25:100

b)

1:4

c)

2:40

d)

4:1

12.

Gear ratio for a 12-tooth driver and a 36-tooth driven gear?

a)

1:3

b)

3:1

c)

36:12

d)

12:36

13.

Driven gear has 8 teeth, Driving gear has 64 teeth. Ratio?

a)

8:64

b)

1:8

c)

64:8

d)

8:1

14.

A 48-tooth gear drives a 16-tooth gear. Ratio is:

a)

16:48

b)

1:3

c)

3:1

d)

48:16

15.

Calculate the gear ratio for a 30-tooth wheel driven by a single-start worm.

a)

1:30

b)

1:3

c)

30:1

d)

3:1

16.

Input: 20 teeth, Output: 100 teeth. Gear Ratio is:

a)

21:40

b)

1:5

c)

100:20

d)

5:1

17.

Driven (24 teeth), Driving (48 teeth). What is the gear ratio?

a)

1:2

b)

2:1

c)

24:48

d)

48:24

18.

Driver (5 teeth), Driven (50 teeth). Gear Ratio is:

a)

1:10

b)

5:50

c)

10:1

d)

50:5

19.

9-tooth driver, 81-tooth driven gear. Ratio is:

a)

81:9

b)

1:9

c)

10:21

d)

9:1

20.

What is the ratio for a 70-tooth output and a 10-tooth input?

a)

70:10

b)

1:7

c)

7:1

d)

11:10

21.

If the wheel has 45 teeth and the worm has 1 start, what is the ratio?

a)

1:5

b)

45:1

c)

5:1

d)

1:45

22.

Driver (35 teeth), Driven (7 teeth). Ratio is:

a)

1:5

b)

5:1

c)

07:35

d)

35:7

23.

Driven gear (18 teeth) is connected to a driving gear (18 teeth). Ratio?

a)

1:2

b)

1:1

c)

2:1

d)

18:1

24.

Input gear has 6 teeth. Output gear has 42 teeth. Ratio is:

a)

1:7

b)

18:6

c)

6:42

d)

7:1

25.

60-tooth gear drives a 20-tooth gear. What is the gear ratio?

a)

3:1

b)

1:3

c)

60:20

d)

21:60

26.

Driven (80 teeth), Driving (40 teeth). Ratio is:

a)

1:2

b)

2:1

c)

80:40

d)

40:80

27.

A worm and wheel has 20 teeth on the wheel and a 1-start worm. Ratio?

a)

10:1

b)

20:1

c)

1:20

d)

01:10

28.

Input (10 teeth), Output (30 teeth). Gear Ratio is:

a)

1:3

b)

3:1

c)

10:30

d)

16:10

29.

Driver (4 teeth), Driven (32 teeth). Gear Ratio is:

a)

1:8

b)

32:4

c)

8:1

d)

4:32

30.

Driven (25 teeth), Driving (100 teeth). Ratio is:

a)

1:4

b)

4:1

c)

24:40

d)

50:2

31.

Input (96 teeth), Output (12 teeth). Ratio is:

a)

8:1

b)

1:8

c)

16:8

d)

13:36

32.

What is the ratio for Driven (45 teeth) and Driver (9 teeth)?

a)

9:45

b)

1:5

c)

21:9

d)

5:1

33.

Find the ratio for a 75-tooth wheel and a single-start worm.

a)

5:1

b)

75:1

c)

2:15

d)

1:5

34.

Driver (15 teeth), Driven (60 teeth). Gear Ratio is:

a)

1:4

b)

16:1

c)

60:15

d)

4:1

35.

Output (33 teeth), Input (11 teeth). Ratio is:

a)

3:1

b)

1:3

c)

11:33

d)

9:11

36.

Driving (56 teeth), Driven (8 teeth). Ratio is:

a)

7:1

b)

1:7

c)

56:8

d)

1:1

37.

Driven (14 teeth), Driving (70 teeth). Ratio is:

a)

14:70

b)

1:5

c)

5:1

d)

40:70

38.

A 4-tooth gear drives a 24-tooth gear. Ratio is:

a)

1:6

b)

6:1

c)

4:24

d)

1:1

39.

A double-start worm drives a 60-tooth wheel. What is the gear ratio?

a)

1:30

b)

60:2

c)

30:1

d)

3:1

40.

Input (8 teeth), Output (48 teeth). Gear Ratio is:

a)

1:6

b)

8:48

c)

2:8

d)

6:1

41.

Driven (30 teeth), Driver (10 teeth). Ratio is:

a)

3:1

b)

1:3

c)

10:30

d)

30:10

42.

Driving (50 teeth), Driven (25 teeth). Ratio is:

a)

1:2

b)

22:25

c)

2:1

d)

1:5

43.

Driven (100 teeth), Driving (10 teeth). Ratio is:

a)

10:100

b)

10:1

c)

1:10

d)

11:40

44.

Input (40 teeth), Output (8 teeth). Ratio is:

a)

5:1

b)

1:5

c)

16:8

d)

1:40

45.

A wheel with 40 teeth is driven by a 1-start worm. Ratio is:

a)

20:01

b)

1:40

c)

40:1

d)

01:20

46.

Driver (2 teeth), Driven (16 teeth). Gear Ratio is:

a)

2:16

b)

1:8

c)

8:1

d)

16:2

47.

Driven (49 teeth), Driving (7 teeth). Ratio is:

a)

7:1

b)

1:7

c)

21:7

d)

7:49

48.

3-tooth driver, 15-tooth driven gear. Ratio is:

a)

3:15

b)

1:5

c)

15:3

d)

5:1

49.

Output (44 teeth), Input (4 teeth). Ratio is:

a)

4:44

b)

11:1

c)

20:4

d)

1:11

50.

Driving (27 teeth), Driven (3 teeth). Ratio is:

a)

3:3

b)

1:9

c)

3:27

d)

9:1

51.
A worm drive has a 99-tooth wheel and a single-start worm. Ratio is:
a)
2:39
b)
99:1
c)
1:10
d)
10:1
52.
Driven (12 teeth), Driving (36 teeth). Ratio is:
a)
3:1
b)
1:3
c)
12:36
d)
12:12
53.
Input (25 teeth), Output (75 teeth). Ratio is:
a)
3:1
b)
1:3
c)
2:1
d)
75:25
54.
Driver (54 teeth), Driven (9 teeth). Ratio is:
a)
1:6
b)
6:1
c)
6:9
d)
9:54
55.
Output (28 teeth), Input (4 teeth). Ratio is:
a)
7:1
b)
1:7
c)
4:28
d)
59:4
56.
Driven (36 teeth), Driving (18 teeth). Ratio is:
a)
2:1
b)
1:2
c)
12:18
d)
18:36
57.
What is the gear ratio for a 120-tooth wheel and a double-start worm?
a)
2:120
b)
60:1
c)
120:2
d)
1:60
58.
Driving (6 teeth), Driven (30 teeth). Ratio is:
a)
5:1
b)
1:5
c)
6:30
d)
30:6
59.
Input (90 teeth), Output (10 teeth). Ratio is:
a)
1:9
b)
9:1
c)
18:10
d)
11:30
60.
Driven (63 teeth), Driver (7 teeth). Ratio is:
a)
1:9
b)
9:1
c)
15:7
d)
8:3
61.
22-tooth gear drives a 44-tooth gear. Ratio is:
a)
2:1
b)
1:2
c)
22:44
d)
20:22
62.
Driver (70 teeth), Driven (14 teeth). Ratio is:
a)
5:1
b)
1:5
c)
22:14
d)
15:10
63.
Does a universal joint (U-joint) change the speed or torque transmitted from the input shaft to the output shaft?
a)
Yes, it increases the speed.
b)
No, it only changes the angle of the shaft.
c)
Yes, it decreases the torque.
d)
Yes, it changes both speed and torque.
64.

A 15-tooth driver gear is connected to a 45-tooth driven gear. What is the gear ratio?

a)

45:15

b)

1:3

c)

3:1

d)

15:45

65.

If a 2-start worm drives a 40-tooth wheel, what is the gear ratio?

a)

20:1

b)

40:2

c)

2:40

d)

1:20

66.

Calculate the gear ratio for a driving gear with 60 teeth and a driven gear with 12 teeth.

a)

5:1

b)

1:5

c)

60:12

d)

12:60

67.
When speed decreases, what happens to the value of torque?
a)
increases
b)
decreases
c)
stays constant
68.
When speed increases, what happens to the value of torque?
a)
increases
b)
decreases
c)
stays constant
69.
When speed is constant, what happens to the value of torque?
a)
increases
b)
decreases
c)
stays constant
70.
What is a Ratio?
a)
It's a comparison of two things
b)
Multiplying two fractions 
c)
A number over another number
d)
Two decimals that can be multiplied
71.

When a input gear is larger than a output gear you have.....

a)

Increased Speed

b)

Increased Torque

72.

What's the ratio?

a)

1:1

b)

84 : 60

c)

60 : 84

73.
Which gear train would you use to ride up a hill?
a)
A
b)
B
74.

Which of the following pics shows a simple gear train that will turn the gears at a constant speed/torque?

a)
b)
c)
75.

If we have a gear ratio of 1:2, there is increased:

a)

speed

b)

torque

76.

If this gear ratio is 5:3, we have increased:

a)

speed

b)

torque

77.

Which gear is the output?

a)

A

b)

B

78.
Which gear is the drive (input)? 
a)
A
b)
B
79.
Which gear train provides more torque?
a)
A
b)
B
80.
If speed increases, torque ________.
a)
decreases
b)
increases
81.
If torque increases, speed _________.
a)
decreases
b)
increases
82.

If the small gear is input gear, what is happening to the torque?

a)

Increase

b)

Decrease

c)

Remains constant

d)

Not enough information

83.
When gears are equal in size, what happens to the speed and torque?
a)
Speed increases; torques decreases
b)
Speed decreases; torque increases
c)
Speed and torque are constant
84.

What does a 1:6 gear ratio mean?

a)

It means the input gear has to turn 1 time to turn the output gear 6 times.

b)

It means the output gear has to turn 1 time to turn the input gear 6 times.

85.
When gears are the same size they turn the same number of times.
a)
True
b)
False
86.

A force in a circular direction is called

a)

rotary motion.

b)

torque.

87.
Movement in a circular motion
a)
Rotary 
b)
Oscillating
c)
Linear
d)
Reciprocating
88.
Movement that goes back and forth in a straight line
a)
Rotary
b)
Linear
c)
Oscillating
d)
Reciprocating 
89.
Movement along an arched path; back and forth
a)
rotary
b)
oscillating
c)
reciprocating
d)
linear
90.

What is the BEST explanation for a gear train with a 7:1 gear ratio?

a)

The driven gear turns 1 time for every 7 turns of the drive gear.

b)

The driven gear turns 7 times for 1 turn of the drive gear.

c)

The gear goes fast!

d)
91.
The image shown is a vice grip.  When the lever is rotated, the grips move towards each other.  What are the input and output motions?
a)
input=linear
output=linear
b)
input=linear
output=reciprocating
c)
Input=rotary
output=rotary
d)
Input=rotary
Output=linear
92.
What is the name of this mechanism?
a)
Simple Gear Train
b)
Gear Train with Idler
c)
Worm and Wheel
d)
Rack and Pinion
93.
What happens to the torque in this mechanism?
a)
Increases
b)
Decreases
c)
Remains Constant
94.
What happens to the speed in this mechanism?
a)
Increases
b)
Decreases
c)
Remains Constant
95.

The ratio of the speed of the driving member of a gear train to that of the driven member.

a)

Gear Ratio

b)

Driven Gear

c)

Drive Gear

d)

All of these

96.

The member of a pair of gears to which motion and power are transmitted by the other. The output gear.

a)

Gear Ratio

b)

Driven Gear

c)

Drive Gear

d)

All of these

97.

The gear which transmits power and motion to the rest of the system. The input gear.

a)

Gear Ratio

b)

Driven Gear

c)

Drive Gear

d)

All of these

98.

Toothed wheel that works to alter the relation between the speed of an engine and the speed of the driven parts.

a)

Mechanism

b)

Input

c)

Force

d)

Gear

99.

A push or pull on an object is called

a)

Mechanism

b)

Input

c)

Force

d)

Gear

100.

Information fed into a system is called

a)

Mechanism

b)

Input

c)

Force

d)

Gear

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