3-63.
Rocker arms are a variation of
which of the following parts?
1.
The clevis
2.
The lever
3.
The turn buckle
4.
The coupling
3-64.
The counterbalance weights on the
clamps of a sleeve coupling serve
to
1.
increase speed
2.
decrease shaft vibration
3.
transmit motion from a link
moving in one direction to a
link moving in a different
direction
4.
change rotary motion to linear
motion
365.
The coil spring in an Oldham
coupling serves to
1.
reduce friction between the
coupling disks
2. keep the coupling disks in
place
3.
make allowance for changes in
shaft length
4.
strengthen the coupling
3-66.
What device is used to couple two
shafts that meet at a 15° angle?
1.
Sleeve coupling
2.
Hooke joint
3.
Oldham coupling
4.
Flexible coupling
367.
The amount of whip in shafts
coupled by a Hooke joint depends on
the
1.
strength of the joint
2.
number of degrees the shafts
are out of line
3.
difference in the lengths of
the shafts
4.
combined weight of the shafts
and the joint
368.
The fixed, flexible, and Oldham
couplings have a common use, which
is to connect rotating shafts that
are
1.
perfectly aligned
2.
misaligned by more than 25°
3.
slightly misaligned
4.
severely stressed
369.
What advantage does a verniertype
coupling have over a sliding lug
coupling?
1.
Simplicity of operation
2.
Strength
3.
Flexibility
4.
Accuracy of adjustment
370.
Cams are generally used for all of
the following purposes EXCEPT
1.
transmitting power
2.
changing the direction of
motion from up and down to
rotary
3.
controlling mechanical units
4.
synchronizing two or more
engaging units
371.
When the valve of figure 3E is not
being lifted by the cam lobe, the
cam roller is held in contact with
the edge of the cam by the
1.
speed of the camshaft
2.
spring as it shortens
3.
weight of the valve
4.
spring as it lengthens
372.
A function of the clutch in the
drive mechanism of a power boat is
to
1.
permit changes in gear ratio
2.
disconnect the engine from the
propeller shaft
3.
reverse the pitch of the
propeller
4.
reverse the direction of the
engine rotation
31