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WorksheetsActuator - Types
Total questions: 24
Worksheet time: 16mins
Actuators are used to:
Sense an object
Activate a chemical
Make a mechanical movement
None of the above
Which type of motion is transmitted by hydraulic actuators?
a. Linear motion
b. Rotary motion
Both a and b
None of the above
What is the function of electric actuator?
Converts electrical energy into mechanical torque
Converts mechanical torque into electrical energy
Converts mechanical energy into mechanical torque
None of the above
What is the advantage of using a single acting cylinder?
High cost and reliable
Honing inside the inner surface of pump is not required
Piston seals are not required
All the above
Why are hydraulic cylinders cushioned?
a. cushioning decelerates the piston of a cylinder
b. stress and vibrations can be reduced
Both a and b
None of the above
In single acting hydraulic cylinders, the piston comes back to its original position due to
Spring force
Self-weight
Momentum of a flywheel
All the above
In a telescopic cylinder, as the number of stages increase
Diameter of piston rod also increases
Diameter of piston rod decreases
Diameter of the piston rod remains the same
None of the above
Which of the following statements is true for standard hydraulic cylinder and a telescopic cylinder?
Telescopic and standard cylinders give same stroke length
Telescopic cylinders give lesser stroke length than standard cylinder
Telescopic cylinders give greater stroke length than standard cylinder
None of the above
Telescopic cylinders have
Only two stage units
Only three stage units
Two or three stage units
Multistage units
Which type of hydraulic cylinder has one piston connected to piston rod extended on both the sides of the cylinder?
a. Telescopic cylinder
b. Tandem cylinder
Both a and b
None of the above
How does cushioning affect the speed of the piston when the cylinder is cushioned at extreme end?
Cushioning decreases the speed of piston near the extreme ends of the cylinder
Cushioning increases the speed of piston near the extreme ends of the cylinder
Cushioning increases the speed of piston at the beginning of the stroke in the cylinder
Cushioning decreases the speed of piston at the beginning of the stroke in the cylinder
Which of the following is a type of cushioning in hydraulic cylinders?
Trunnion cushioning
Adjustable cushioning
Clevis cushioning
None of the above
Low-torque high-speed motors are used in
Cranes
Fans
Winches
All the above
What is the function of hydraulic motor?
1. hydraulic motor converts hydraulic oil under pressure into torque and angular displacement
2. hydraulic motor converts hydraulic oil under pressure into force and linear displacement
3. hydraulic motor converts hydraulic energy into mechanical energy
4. hydraulic motor converts mechanical energy into hydraulic energy
1 and 4
1 and 3
2 and 3
2 and 4
Match the following group 1 items with group 2 items and select the correct option.
1. Radial motor --------------------------- A. Swash plate
2. Axial motor ----------------------------- B. Crank shaft motor
3. Orbit -------------------------------------- C. Vane motor
4. Low torque motor ---------------------- D. Geroller motor
1-B, 2-A, 3-D, 4-C
1-A, 2-C, 3-B, 4-D
1-C, 2- A, 3-B, 4-D
1-B, 2-D, 3-A, 4-C
A pneumatic cylinder is required to extend at a minimum speed of 0.75 m/s in a system with a flow rate of 50 LPM. What cylinder size is required?
dp = 37.6mm
dp = 35.6mm
dp = 39.6mm
dp = 33.6mm
An 8 cm diameter pneumatic cylinder has a 4 cm diameter rod. If the cylinder receives flow at 100 LPM and 6 bar, find the (a) Extension and retraction speeds
Vext = 0.3115 m/s, Vret = 0.422 m/s
Vext = 0.3315 m/s, Vret = 0.442 m/s
Vext = 0.422 m/s, Vret = 0.3115 m/s
Vext = 0.442 m/s, Vret = 0.3315 m/s
In---------------------- type of cylinder, the force on the piston rod is almost doubled.
Rodless Cylinder
Telescopic Cylinder
Tandem Cylinder
Double acting cylinder
Telescopic cylinders are normally used for ----------------- stroke lengths
(a)
Cylinder with -------mounting generally require strong machine frames to resist bending moments
non-centreline
centreline
All the above
None of the above
Telescopic cylinder is used when long stroke length and short retracted length are required.
True
False
An 8 cm diameter pneumatic cylinder has a 4 cm diameter rod. If the cylinder receives flow at 100 LPM and 6 bar, find the (a) Extension load carrying capacities.
(a)
The following is Graphical symbol of
Telescopic cylinder – double acting
Double acting cylinder
Double acting cylinder –double piston rod
Tandem cylinder
The following is Graphical symbol of
Telescopic cylinder –double acting
Double acting cylinder –double piston rod
Double acting cylinder – variable cushion on one side–
Double acting cylinder – variable cushion on both sides
