2–31.
2–32.
2-29.
Gears B and C in the gear
arrangement shown in figure 2C are
rigidly fixed together.
If gear A
is turned counterclockwise at a
rate of 120 rpm, in what direction
and at what rate will gear D turn?
1.
Clockwise at 20 rpm
2.
Clockwise at 50 rpm
3.
counterclockwise at 50 rpm
4.
Counterclockwise at 100 rpm
2–30.
The product of all the driving
teeth of a turbine reduction
gearing is 400 and the product of
the driven teeth is 4,000.
When
the output shaft turns at 200 rpm,
the turbine turns at
o
1.
200 rpm
2E.
2.
400 rpm
3.
2,000 rpm
2–33.
4.
4,000 rpm
2–34.
2–35.
The speed ratio of the gear train
in figure 2D is 2 to 1.
If gear B
is removed and gear C is placed so
that it runs directly off gear A.
the
1.
2.
3.
4.
The
1.
2.
3.
4.
speed ratio will be
2.0 to 1
2.4 to 1
3.0 to 1
4.0 to 1
purpose of an idler gear is to
increase the speed ratio
take up lost motion
change the direction of
rotation
keep another gear in place
Items 2–33 through 2–36
on the gear train shown
Which gear serves as an
1. D
2. C
3. B
4. A
are based
in figure
idler gear?
If gear A turns at 300 rpm, how
fast does gear G turn?
1.
180 rpm
2.
100 rpm
3.
87 rpm
4.
80 rpm
What is the mechanical advantage of
the train?
1.
Five
2. Two
3.
Three
4.
Four
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