Deck 17: Gears

Question 1

Rotary motion is changed into reciprocating motion by a rack.

Answer 1

True

Question 2

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

Answer 2

True

Question 3

Gears are unable to change direction of rotation.

Answer 3

False

Question 4

Gears are designed to do all of the following except:

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

Question 5

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

Question 6

Diametrical pitch can be defined as:

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.

Question 7

How many teeth are on a spur gear having a pitch diameter of 1.750, diametrical pitch of 20, and outside diameter of 1.850?

A)3.24
B)37
C) 16
D) 35

Question 8

The outside diameter of a spur gear having a pitch diameter of 1.500 and 48 teeth is 1.68.

Question 9

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

Question 10

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

Question 11

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

Question 12

The outside diameter of a friction is called the pitch diameter.

Question 13

The pitch diameter of a spur gear having 40 teeth and a diametrical pitch of 20 is 19.68.

Question 14

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

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

Question 15

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

Question 16

A ratio of 2:1 between Gear A and Gear B means that Gear B rotates two times every time Gear A rotates once.

Question 17

Two or more gears used to achieve a designed rpm is a gear blank.

Question 18

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

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

Question 19

The root diameter of a spur gear having a pitch diameter of 2.000 and 32 teeth is 1.75.

Question 20

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

Question 21

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

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

Question 22

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

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

Question 23

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

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

Question 24

When cutting the teeth for bevel gears, how does one compute diametrical pitch (P)?

A).5(2.188) + sin d
B)1/p
C) 3.1416 × sin d
D) 3.1416/p

Question 25

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

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

Question 26

To draw two spur gear teeth in contact, begin by:

A)laying out the center-to-center distance
B)laying out the pressure line at 20 degrees
C) calculating the center-to-center distance
D) drawing the outside diameter of each gear

Question 27

​The most efficient method to draw teeth is to:

A)use a gear tooth caliper
B)draw one tooth then trace the rest
C) use a gear template
D) All of the above can be used.

Question 28

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

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

Question 29

All pairs of spur gears must have the same:

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

Question 30

How does one compute the center-to-center distance between worm and worm gear?

A)P × .3181
B)D + .636 × Pa
C) Nworm gear/Dworm
D) Dworm + Dworm gear/2

Question 31

The overall length of a gear is the:

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 32

A gear train can best be described as:

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

Question 33

The diametral pitch is a ratio equal to the number of teeth per inch of the _____.

A)circular pitch diameter
B)root diameter
C) overall diameter
D) pitch diameter

Question 34

The ratio of the first gear to the last gear is called the:

A)gear velocity
B)pitch diameter
C) gear ratio
D) train value

Question 35

If the teeth of a gear are not parallel to the shaft, it is called a _____ gear.

A)herringbone
B)helical
C) bevel
D) miter