Deck 20: Gears and Cams

Question 1

A _____ circle is a circle connecting the outer edge of the gear teeth.

A) addendum
B) pitch
C) dedendum
D) base

Answer 1

A

Question 2

Which of these is NOT a type of cam follower?

A) round
B) flat faced
C) key
D) pointed

Answer 2

C

Question 3

Grid layouts can be used to establish the exact shape of the circumference of cam shapes.

Answer 3

True

Question 4

The surface of the gear tooth that applies pressure on the adjacent gear's tooth is called the:

A) clearance
B) tooth face
C) dedendum
D) flank

Question 5

What type of gears transmit power between shafts that intersect at an angle?

A) helical
B) worm
C) rack and pinion
D) bevel

Question 6

When gears are shown in pictorial drawings, they usually include teeth details.

Question 7

The changes in direction from a _____ motion curve are abrupt and cause a jerky motion in the follower.

A) harmonic
B) uniform
C) cycloidal
D) uniform accelerated and decelerated

Question 8

Cam shapes are determined by the desired motion of a follower.

Question 9

A _____ circle is the circle from which the involute tooth profile begins.

A) dedendum
B) addendum
C) pitch
D) base

Question 10

On a displacement diagram, all nonhorizontal lines result in an upward or downward movement of the follower.

Question 11

An involute curve is formed by connecting the position of a point at evenly-spaced intervals on the circumference of a circle as that circle is rolled on a flat surface.

Question 12

A displacement diagram must be converted to radial distances to create a cam shape.

Question 13

Friction wheels transmit power between shafts using a belt.

Question 14

The difference between the rotation speed of two gears in contact is known as the:

A) gear ratio
B) gear axis
C) acceleration disparity
D) deceleration disparity

Question 15

Gears that operate on parallel shafts with gear teeth cut in a twisted, oblique angle to the shaft are known as _____ gears.

A) hypoid
B) helical
C) worm
D) spur

Question 16

All gears are toothed.

Question 17

What are the three types of cams?

A) drum, face, and plate
B) stationary, rotary, and reciprocating
C) standard, follower, and shaft
D) vertical, horizontal, and diagonal

Question 18

What term refers to the lower side of a gear tooth between the base circle and root?

A) gear axis
B) fillet
C) flank
D) clearance

Question 19

The lead of the worm is the distance the worm gear will travel in three revolutions of the worm.

Question 20

Angular gears are neither perpendicular nor parallel.

Question 21

Imagine that you need to determine the specifications of a spur gear. What should you do need to determine first?

A) addendum
B) pitch diameter
C) number of teeth
D) diametral pitch

Question 22

Imagine that you are plotting the parabola for a uniform accelerated and decelerated motion curve. Into what displacement ratios should you divide the vertical follower distance line?

A) 1:3:5
B) 2:3:4
C) 2:4:6
D) 3:5:7

Question 23

Imagine that you are drawing a uniform motion plate cam. What do you need to do immediately before laying out the rise displacement circles from the displacement diagram?

A) plot the points from intersecting rise circles and circumference divisions
B) lay out the base circle
C) lay out the circumference divisions
D) connect the points

Question 24

If the addendum is 4 units, the dedendum is 6 units, and the working depth is 2 units, what is the clearance?

A) 2
B) 4
C) 10
D) 12

Question 25

Which statement about bevel gear teeth is correct?

A) They are designed in pairs.
B) They are interchangeable.
C) They are rectangular in shape.
D) They are basically screws with single or multiple threads.

Question 26

Imagine that you need to determine the specifications of a bevel gear. If the pitch angle is 68°, the root angle is 57°, and the dedendum angle is 5°, what size should the angle of the shaft be?

A) 52°
B) 62°
C) 68°
D) 90°

Question 27

Imagine that you need to determine the specifications for a worm gear and you have just calculated the addendum. What do you need to determine next?

A) pressure angle
B) whole depth
C) number of teeth
D) pitch diameter

Question 28

What type of gears are primarily used in automobile differentials?

A) hypoid gears
B) cross helical gears
C) ring gears
D) rack and pinion gears

Question 29

When drawing a cam, if intersecting points are too far apart to produce a smooth curve, a(n) _____ template may be used to smooth out the contour.

A) J-curve
B) S-curve
C) bell curve
D) irregular curve

Question 30

Which geometric line shape holds the follower at a fixed position?

A) straight angular line
B) parabolic curve
C) harmonic curve
D) straight horizontal line