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WorksheetsHydraulic circuits
Total questions: 25
Worksheet time: 13mins
Hydraulic circuits are working based on which law
Boyle's law
Charle's law
Pascal's law
Avagadro's law
Which mode of power transmission is best suited for the automatic machine tool feed movement
Pneumatic
Hydraulic
Electric
Mechanical
Which mode of power transmission is best suited for longer distance power transmission
Hydraulic
Electric
Mechanical
Pneumatic
Select the wrong statement
hydraulic motors can produce a large amount of torque while operating at low speeds
Fluid power systems can deliver constant torque or force regardless of speed changes
The hydraulic system has a low weight to power ratio compared to electromechanical systems
A single hydraulic pump can provide power and control for numerous machines using valve manifolds and distribution systems
Hydraulic systems are faster than electric systems
Select the wrong statement
An oil hydraulic system operates at pressures up to 700 bar
A pneumatic system usually operates at 5–10 bar
Pneumatic systems are heavier in weight
Accurate positioning of feed movement is not possible in pneumatic system
None of the above
The pump which is not suitable for a hydraulic system is
Centrifugal pump
Positive displacement pumps
Gear pump
Vane pump
which device is responsible for setting the maximum pressure in a hydraulic system
Direction control valve
Flow control valve
Sequence valve
Pressure relief valve
For getting higher force output from actuator
Stroke length should be increased
Piston diameter should be increased
Flow rate of oil should be increased
Heavier oil should be used
The retraction speed of double acting cylinder is higher than extension stroke since
Effective piston area of retraction is less
Less volume of fluid is required for retraction stroke.
Extension stroke is used for taking higher load
All of the above
None of the above
Which of the following properties of an oil is not desirable for a hydraulic system
Demulsibility.
Incompressibility
Fire resistance
Foam resistance
High density
The temperature at which an oil surface gives off sufficient vapours to ignite when a flame is passed over the surface.
fire point
boiling point
flash point
melting point
The function of a flow control valve is to
Regulate the pressure of oil
regulate the direction of flow of oil
regulate the rate of flow of oil
relief the pressure
A 4/3 direction control valve consists of ------- Ports
4
3
7
2
figure shows the symbol of ------------ valve
Unloading valve
Sequence valve
pressure relief valve
counterbalance valve
Figure shows the symbol of ------- valve
pilot operated check valve
check valve
relief valve
solenoid valve
A sequence valve operates only when
the system pressure is below the set value
the system pressure is above the set value
when input and output pressure are equal
when output pressure is low
figure shows the symbol of a ------------ valve
4/2 solenoid operated dcv
4/3 solenoid operated dcv
3/4 push button operated dcv
4/3 push button operated dcv
which of the statement is true for an accumulator
Act as an auxiliary power source
Act as a leakage compensator
Act as a hydraulic shock absorber
Act as a thermal expansion compensator
All of the above
An intensifier is used as
an emergency power source
a relief valve
a pressure compensator
a pressure amplifier
A solenoid valve is operated by
pilot pressure
push button
lever
electric current
speed of an actuator can be varied by
adjusting the flow control valve
adjusting the pressure of pump
setting the relief valve
controlling the dcv
Rotary actuator in a hydraulic system is known as
pump
semi rotary actuator
hydraulic actuator
hydraulic motor
select the wrong statement
A hydraulic motor can be rotated in both directions
speed of a hydraulic motor can be varied by a flow control valve
Torque of a hydraulic motor is less than an electric motor of same size
hydraulic motor is compact than an electric motor of same power rating
which of the following is a variable discharge positive displacement pump
Gear pump
Lobe pump
Piston pump
Swash plate piston pump
How much is the force developed on a single acting cylinder of piston area 100 square cm under an oil pressure of 10MPa
100 kN
10 kN
1000 kN
1 kN
