REFER TO FIGURE 2-11 OF YOUR TEXTBOOK IN
ANSWERING QUESTIONS 1-29 AND 1-30, WHICH
DEAL WITH THE MULTIPLICATION OF FORCES
IN POWER SYSTEMS.
1-29.
Assume that the input piston has
an area of 3 square inches with a
force of 45 pounds.
What is the
pressure in the system?
1.
5 psi
2.
10 psi
3.
15 psi
4.
20 psi
1-30.
Assume that the output piston has
a diameter of 6 inches and is
subject to a pressure of 10
pounds per square inch.
What is
the force exerted on the output
piston?
1.
28.26 pounds
2.
31.4 pounds
3.
282.6 pounds
4.
314.0 pounds
Refer to figure 1A in answering
questions 1-31 and 1-32.
The rule
applying to the action of the piston
states that the force acting on the
piston surface area from chamber C is
proportional to the pressure in chamber
C times the area of the piston head.
The force acting on the piston from
chamber D is proportional to the
pressure in chamber D times the
effective area of the piston head (which
is the cross-sectional area of the
piston minus the cross-sectional area of
the piston shaft.)
The piston surface
in chamber C is 25 square inches, and
the effective area in chamber D is 20
square inches.
1-31.
The pressure in line A is 200
psi.
No force is exerted on
shaft S.
How much pressure will
be required in line B to prevent
the piston from moving?
1.
160 psi
2.
200 psi
3.
250 psi
4.
500 psi
1-32.
Lines A and B are pressurized to
50 psi.
How much force is
applied to each surface and which
way will the piston move?
1.
C = 1250 pounds, D = 1000
pounds, piston will move to
the right
2.
C = 1250 pounds, D = 1000
pounds, piston will move to
the left
3.
C = 1000 pounds, D = 1250
pounds, piston will move to
the right
4.
C = 1000 pounds, D = 1250
pounds, piston will move to
the left
1-33.
For two pistons in the same fluid
power system, the distances moved
are inversely proportional to the
1.
pressure of the fluid
2.
volume of fluid moved
3.
expansion of the fluid
4.
areas of the pistons
Learning Objective:
Recognize
the characteristics and behavior
of fluids in motion, including
methods for measuring volume and
velocity, and relate the dynamic
and static factors involved with
fluid flow.
1-34.
In fluid power syetems using
liquids, the measurement of the
volume of fluid flow is made in
units of
1.
cubic inches per minute
2.
gallons per minute
3.
cubic feet per minute
4.
cubic yards per minute
Figure 1A
4