Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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In a gear drive the ratio of the ___________ can be used to compute gear
ratio.
a. | pitch diameters | c. | the gear pitches | b. | outer diameters | d. | shaft diameters |
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2.
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The purpose of the idler gear is to either ______________ of the driven gear or
transfer power to a location which is farther from the driver shaft.
a. | increase torque | c. | increase speed | b. | change the direction of
rotation | d. | decrease
speed |
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3.
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A gear drive has a 12-tooth driver gear and an 18-tooth driven gear. If
the driver gear is rotating at 720 RPM the rotational speed of the driven gear will be ________ RPM.
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4.
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The pitch of a gear is the distance between ___________.
a. | the top point of each tooth to the corresponding point on the adjacent
tooth | c. | one point on a tooth and the corresponding point on the next tooth measured along the
pitch circle | b. | the distance between two corresponding teeth located at the base of the
teeth | d. | the angle of the
teeth between the top of the teeth and the base |
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5.
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A gear drive system using two spur gears connected by an idler gear is an
example of a _____________ gear drive
a. | parallel axis | c. | non-intersecting axis | b. | intersecting
axis | d. | moving
axis |
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6.
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A rack and pinion drive is an example of a(n) _____________ gear drive.
a. | parallel axis | c. | non-intersecting axis | b. | intersecting
axis | d. | moving
axis |
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7.
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One disadvantage of helical gears is __________________.
a. | excess noise | c. | side thrust | b. | low efficiency | d. | excess weight |
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8.
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Diametral pitch is the ratio of _________________.
a. | the pitch diameter to the outer diameter | c. | pitch diameter to the
pitch | b. | outer diameter to the base circle diameter | d. | number of teeth to the pitch
diameter |
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9.
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A gear with a diametral pitch of 16 will mesh with _______________.
a. | any gear having a diametral pitch of 16 or lower | c. | only a gear having a diametral
pitch of 16 | b. | any gear having a diametral pitch of 16 or higher | d. | only a gear haveing a diametral pitch greater
than 16 |
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10.
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Backlash is the ________________.
a. | distance between the bottom land and the top land of a gear | c. | working depth of a
gear | b. | difference between the thickness of a tooth and the width of the tooth
space | d. | difference between
the runout of two shafts having meshing gears installed on each shaft |
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11.
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The ideal center distance between two gears is that distance which
________________.
a. | causes the gears’ pitch to be tangent to each other | c. | allows maximum
space between the top land and the bottom land | b. | produces no backlash | d. | maximizes
backlash |
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12.
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One of the features of a gear is the tooth profile, which is defined as the
_______________.
a. | surface area on top of the tooth | c. | surface area of the tooth which is
below the pitch circle | b. | line on the tooth edge which blends with the
root | d. | shape made by the edge
of the tooth |
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13.
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Two types of tooth profiles are involute and cycloidal. Most spur gears
use the involute design which provides an additional advantage in that ___________________.
a. | the teeth roll more than slip, reducing friction | c. | has no straight tooth
rack | b. | no backlash | d. | increased torque |
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14.
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The first step in aligning and installing a spur gear system is
_________________.
a. | mount gears on the shaft | c. | mesh the gears | b. | inspect gears for
wear | d. | mount and level the
motor and driven component |
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15.
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The diametral pitch can be determined by calculating the _______________.
a. | number of teeth and tooth angle | c. | number of teeth and center
distances | b. | number of teeth and pitch diameter | d. | center distance and pitch
diameter |
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16.
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The actual backlash between two gears can be measured using which of the
following methods?
a. | Tachometer reading at the center of each gear | c. | Direct dial indicator
measurement | b. | Micrometer reading of gear teeth width | d. | Spirit level reading between the gear
centers |
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Matching
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SEGMENT 1
a. | gear | d. | change | b. | number | e. | closed | c. | idler | f. | pitch |
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17.
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A gear that transfers speed and torque from a driver gear to a driven gear is
called a(n) ________________ gear.
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18.
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Idler gears ___________ the direction of rotation or transfer power to a
location that is farther from the driven shaft.
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19.
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A gear drive that has a housing which contains the gears and lubricant is
called a(n) ________________ unit gear drive.
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20.
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The ________ ratio is determined by dividing the pitch diameter of the driven
gear by that of the driver gear.
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21.
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The same ratio can also be determined by using the ratio of the __________ of
the teeth of the two gears.
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22.
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The circle along which speed and torque are directly transferred is called the
___________ circle.
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SEGMENT 2
a. | parallel | e. | directly | b. | moving axis | f. | non-intersecting | c. | helical | g. | 90-degrees | d. | inversely | h. | spur |
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23.
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The speed ratio of a gear drive is __________ proportional to the gear ratio.
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24.
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A(n) ratio of a gear drive is __________ proportional to the gear ratio.
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25.
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A(n) ___________ axis gear drive is one in whih the driver and driven shafts
lie side-by-side and point in the same direction.
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26.
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A worm gear drive is an example of a(n) ____________ axis gear drive.
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27.
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The shafts of an intersecting gear drive are at a(n) ________ angle to each
other.
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28.
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A rack pinion gear drive is an example of a(n) _________ gear drive system.
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29.
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The most basic type of gear, whose teeth are cut parallel to the shaft axis, is
known as a(n) ________ gear.
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30.
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A type of gear whose teeth are cut at an angle to the axis of rotation and can
be operated at higher speeds than a spur gear is known as a(n) ___________ gear.
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SEGMENT 3
a. | tooth profile | d. | tooth space | b. | line, action | e. | pinion | c. | meshing | f. | backlash |
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31.
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_____________ is the volume of space between two teeth of a gear.
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32.
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The characteristics shape made by the edge of a tooth is known as the
___________.
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33.
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When the gears of a gear drive are differing sizes, the smaller gear is known
as the _______.
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34.
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The __________ of ______________ is the path made by the point where the two
gears make contact.
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35.
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____________ is the difference between the thickness of a tooth and the width
of the tooth space.
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36.
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The _________ is the distance from the pitch circle to the bottom land and
coincides with the tooth flank.
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SEGMENT 4
a. | diametral | d. | lubricated | b. | adjusted | e. | alignment | c. | lubricant | f. | backlash |
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37.
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Some types of gear drives are designed so that the backlash can be __________.
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38.
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The _____________ of a gear drive can be accomplished through the use of a
straight edge or a length of string.
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39.
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Metal gears must be ___________, which is accomplished with gear oil.
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40.
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____________ is defined as the clearance between the back of the engaged tooth
of the driver gear and the front of the engaged tooth of the driven gear.
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41.
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A certain amount of backlash is necessary to enable the gears to mesh smoothly
and to allow ____________ to get to each tooth.
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42.
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The appropriate amount of backlash taht should be used in a gear drive can be
determined by locating the _____________ pitch of the gears in a table.
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SEGMENT 5
a. | direct | d. | rotated | b. | direct, indirect | e. | length | c. | dial
indicator | f. | indirect |
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43.
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Backlash can be measured by using a(n) _____________ _________.
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44.
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When measuring backlash, one gear must be held in a fixed position while the
other is ____________ back and forth.
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45.
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The two methods of measuring backlash are known as ___________ and ____________
measurement.
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46.
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The _____________ method of measuring backlash is most often used for larger
gears.
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47.
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In one method of measuring backlash, a bar is attached to the driven shaft and
a dial indicator measures its movement. This method must be adjusted to account for the __________ of
the bar.
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48.
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The _____________ method of measuring backlash is used when the gears are not
easy to access or the gear teetch are very small.
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