Question 1

Diametrical pitch can be defined as:

Accepted Answer

A) Diameter of the gear blank divided by two. 
B) A ratio equal to the number of teeth on a gear per inch of pitch diameter. 
C)  The chordal thickness divided by the pressure angle. 
D)  Number of teeth divided by the dedendum. 
A) Diameter of the gear blank divided by two. 
B) A ratio equal to the number of teeth on a gear per inch of pitch diameter. 
C)  The chordal thickness divided by the pressure angle. 
D)  Number of teeth divided by the dedendum. B

Question 2

The circular pitch of a bevel pinion having a 16 diametrical pitch and 20 teeth is 1.43.

Accepted Answer

A) True 
 B)False  False

Question 3

When cutting teeth for a worm gear, how does one compute the pitch diameter?

Accepted Answer

A) D + (2 × a) 
B) .686 × Pa 
C)  P × N 
D)  DO - (2 × a) 
A) D + (2 × a) 
B) .686 × Pa 
C)  P × N 
D)  DO - (2 × a) D

Question 4

A worm gear is used to transmit motion and power at 90 degrees between intersecting shafts.

Accepted Answer

A) True 
 B)False

Question 5

The main difference between a miter gear and a bevel gear is the ratio of teeth.

Accepted Answer

A) True 
 B)False

Question 6

Gears are unable to change direction of rotation.

Accepted Answer

A) True 
 B)False

Question 7

What is the dedendum of a spur gear having a pitch diameter of 3.000 and 48 teeth?

Accepted Answer

A) 0.3857 
B) 0.2692 
C)  1.4617 
D)  0.3889 
A) 0.3857 
B) 0.2692 
C)  1.4617 
D)  0.3889

Question 8

What is the diametrical pitch of a pinion gear having 75 teeth and 3.208 outside diameter? (Use the formula P = N/D.)

Accepted Answer

A) 19.68 
B) 23.38 
C)  24.83 
D)  23.21 
A) 19.68 
B) 23.38 
C)  24.83 
D)  23.21

Question 9

The pitch diameter of a gear can be thought of as the outside diameter of the friction wheel.

Accepted Answer

A) True 
 B)False

Question 10

Gears are designed to do all of the following except:

Accepted Answer

A) change speed 
B) change direction 
C)  change rotary motion into reciprocating motion 
D)  change distance of travel 
A) change speed 
B) change direction 
C)  change rotary motion into reciprocating motion 
D)  change distance of travel

Question 11

The length of the chord measured across at the pitch diameter is:

Accepted Answer

A) chordal thickness 
B) chordal addendum 
C)  clearance 
D)  whole depth 
A) chordal thickness 
B) chordal addendum 
C)  clearance 
D)  whole depth

Question 12

To connect large turbine gears together, a _____ gear should be used.

Accepted Answer

A) spur 
B) ring 
C)  herringbone 
D)  helical 
A) spur 
B) ring 
C)  herringbone 
D)  helical

Question 13

A rack gear is designed to change rotary motion into _____ motion.

Accepted Answer

A) reciprocating 
B) straight-line 
C)  rotary 
D)  all of the above 
A) reciprocating 
B) straight-line 
C)  rotary 
D)  all of the above

Question 14

A rack gear is similar to a spur gear except the teeth are in a straight line.

Accepted Answer

A) True 
 B)False

Question 15

All pairs of spur gears must have the same:

Accepted Answer

A) root diameter 
B) outside diameter 
C)  diametral pitch 
D)  pressure angle 
A) root diameter 
B) outside diameter 
C)  diametral pitch 
D)  pressure angle

Question 16

An angle gear is designed with teeth at 45, 60, or 90 degrees to each other.

Accepted Answer

A) True 
 B)False

Question 17

The overall length of a gear is the:

Accepted Answer

A) distance of the root diameter 
B) distance of the inside diameter 
C)  distance of the outside diameter 
D)  distance from the hub outside to the other side of the gear 
A) distance of the root diameter 
B) distance of the inside diameter 
C)  distance of the outside diameter 
D)  distance from the hub outside to the other side of the gear

Question 18

Which of the following is not a widely used type of gear?

Accepted Answer

A) pinion 
B) spur 
C)  circular 
D)  helical 
A) pinion 
B) spur 
C)  circular 
D)  helical

Question 19

Power and motion are transmitted between intersecting shafts at right angles to each other by bevel gears.

Accepted Answer

A) True 
 B)False

Question 20

A gear train can best be described as:

Accepted Answer

A) a series of gears linked together 
B) two or more gears used to achieve a designed rpm 
C)  a power transmission device for transferring motion 
D)  a series of gear pinions 
A) a series of gears linked together 
B) two or more gears used to achieve a designed rpm 
C)  a power transmission device for transferring motion 
D)  a series of gear pinions

Exam 17: Gears

Diametrical pitch can be defined as:

The circular pitch of a bevel pinion having a 16 diametrical pitch and 20 teeth is 1.43.

When cutting teeth for a worm gear, how does one compute the pitch diameter?

A worm gear is used to transmit motion and power at 90 degrees between intersecting shafts.

The main difference between a miter gear and a bevel gear is the ratio of teeth.

Gears are unable to change direction of rotation.

What is the dedendum of a spur gear having a pitch diameter of 3.000 and 48 teeth?

What is the diametrical pitch of a pinion gear having 75 teeth and 3.208 outside diameter? (Use the formula P = N/D.)

The pitch diameter of a gear can be thought of as the outside diameter of the friction wheel.

Gears are designed to do all of the following except:

The length of the chord measured across at the pitch diameter is:

To connect large turbine gears together, a _____ gear should be used.

A rack gear is designed to change rotary motion into _____ motion.

A rack gear is similar to a spur gear except the teeth are in a straight line.

All pairs of spur gears must have the same:

An angle gear is designed with teeth at 45, 60, or 90 degrees to each other.

The overall length of a gear is the:

Which of the following is not a widely used type of gear?

Power and motion are transmitted between intersecting shafts at right angles to each other by bevel gears.

A gear train can best be described as:

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