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WorksheetsSiemens Level 1 Hydraulic/Pneumatic #1
Total questions: 37
Worksheet time: 1hrs 14mins
If the cross section area A (in cm2) of the piston, the supplied air pressure pe (in Bar), and the reset force of the spring FR (in N) are given, which of the following equations is correct to determine the force F (in N) of extension of the single-acting cylinder shown below.
The force of retraction F (in N) of a double-acting cylinder when retracting should be calculated. In which of the following formulas is the relationship correct mathematically described?
For the extension of the cylinder shown below, a force of F = 300 N is needed. If the frictional force is 10 % of F, how high must the applied air pressure pe be to move the slide?
pe = 0.25 bar
pe = 4.5 bar
pe = 5.5 bar
pe = 6.5 bar
pe = 9.7 bar
As shown below, the force required to advance the cylinder should be 600 N. During the cylinder extension, the back pressure of the adjustable one-way flow control valve is 1.5 bar. What is the applied air pressure pe in bar?
pe = 3.0 bar
pe = 5.5 bar
pe = 6.0 bar
pe = 6.5 bar
pe = 12.0 bar
Which of the following statements about advantages and disadvantages of pneumatics is correct?
A
B
C
D
E
Given for the system shown below: A1 = 50 cm2, A2 = 800 cm2, s1 = 16 cm. Determine s2.
s2=25mm
s2=0.256cm
s2=1cm
s2=2.56cm
s2=10cm
Which of the following components are parts of an air service unit?
Cooler, filter, accumulator, pressure regulating valve
Manometer, filter, lubricator, vacuum generator
Pressure regulating valve, filter, cooler, pressure sensor
Filter, accumulator, manometer, lubricator
Filter, pressure regulating valve, lubricator
Which statements about the component shown below are correct? Two answers are correct.
The air pressure at X acts on a cylinder surface. If the force exerted exceeds the spring force of the return spring, the piston moves and operates the contact set.
An electronic pressure sensor with digital output signal is shown. Instead of actuating mechanical contacts, the output is switched electronically.
Y is a knob for adjusting the spring force of the return spring.
When the piston moves to operate the contact set the connection between 2 and 4 is closed.
Y is a pushbutton to check the functionality of the pressure switch.
What is the use of the cushioning of a double-acting cylinder?
It protects the cylinder against excessively high air pressure.
It reduces the noise of the escaped air.
It prevents a hard striking of the piston at the end positions.
It holds the piston in position.
It controls the speed motion of the cylinder during extension.
Which statement about a single-acting cylinder is correct?
The retraction of the piston is usually achieved by a spring.
The piston speeds in extension and retraction can be set.
Both piston sides will alternately be pressurized with compressed air.
Work can be conducted during extension and retraction of the piston.
It has a larger air consumption than a double-acting cylinder.
A pneumatic valve is defined as a 5/2 - way valve. What does the number 5 mean in this definition?
The valve has a port for the exhaust.
The valve has 5 switching positions.
The valve has a neutral position and 4 other switching positions.
The valve has 5 ports.
The valve has 5 ports for work conductions.
Which statement about the mode of action of the symbolically represented flow control valve is correct?
The compressed air can flow unthrottled from 1 to 2.
The stream of air flow can be continuously adjusted.
The compressed air can flow unthrottled through the valve in two directions.
The valve stops the flow of the compressed air from 2 to 1.
The valve can throttle the stream of air from 1 to 2 and 2 to 1.
Which component is represented symbolically?
3/2- way valve
5/2- way valve
4/2- way valve
5/3-way valve
Quick exhaust valve
Which symbol represents a pilot controlled 5/2-way double solenoid valve?
How can the piston speed of cylinder 1A be greater during retraction than it is in extension for the control system shown below?
By installation of a quick exhaust valve between valve 1V1 and 1V2
By installation of a silencer in valve 1V1
By installation of a flow control valve instead of the one-way flow control valve 1V3
By installation of an air reservoir between valve 1V3 and cylinder 1A
By installation of a quick exhaust valve instead of the one-way flow control valve 1V2
Which of the following statements about the control system shown below are correct? Two answers are correct.
The directional control valve 1V1 has four ports, two switching positions and is electrically actuated.
1V3 is an adjustable non-return valve.
The flow rate to retract cylinder 2A is determined by the adjustable one-way flow control valve 2V2.
The force for advancing the cylinder 1A is higher than the force for retracting it.
The directional control valve 2V1 has two ports, two switching positions and is electrically actuated.
Which statements about an electropneumatic control system are correct? In the event of failure of the electrical power supply or a wire break … Two answers are correct.
… a double solenoid valve moves to the neutral position.
… a double solenoid valve position is unchanged.
… a spring-return valve combined with a dominant "ON" latching circuit moves to the neutral position.
… a spring-return valve combined with a dominant "OFF" latching circuit moves to the neutral position.
… a spring-return valve is ever actuated.
Which statement about the mode of operation of the 3/2 - way valve in the switching positions a and b represented symbolically is correct?
A
B
C
D
E
A simplified displacement step diagram is shown below. Which of the following statements about the operation of the control system is correct?
While cylinder 2A advances, cylinder C1 remains in the actuated position.
Cylinder 2A advances after cylinder 1A has reached its retracted end position.
Cylinder 2A extends. When the forward end position is reached, the piston rod returns automatically.
The solenoid coil of 1V1 is energized as long as cylinder 1A advances and retracts.
Cylinder 1A retracts as soon as valve 2V1 is actuated.
Which of the following displacement step diagrams show the operations of the cylinder 1A and the valve 1V1 correctly in the pneumatic circuit diagram below?
The electrical circuit diagram and the pneumatic circuit diagram of a control system are shown below. Which statements about the mode of operation are correct?
The push button S1 acts directly on the coil 1Y1 of the double solenoid valve.
The prerequisite for the return movement is that first pushbutton S1 must have been released.
When the advancing piston rod reaches the forward end position, the solenoid coil 1Y2 is actuated via limit switch 1S2 and the piston rod retracts.
If the pushbutton is released during the advancing movement, the piston rod is retracted without having reached the forward end position.
The relay K1 with latching function is to be used for signal storage.
The electrical circuit diagram and the pneumatic circuit diagram of a control system are shown below. Which statements about the mode of action are correct? Two answers are correct.
The piston rod of cylinder 1A is to advance when pushbutton S1 and S2 are pressed at the same time.
The relay K1 with latching function is to be used for signal storage.
If the "ON" and "OFF" pushbuttons are both pressed at the same time, the relay coil is energized. The circuit is referred to as a dominant "ON" latching circuit.
The piston rod of cylinder 1A is to advance when pushbutton S1 is pressed. When the latching is released by actuation of pushbutton S2, the piston rod retracts.
The signal storage is effected in the power section of the valve.
The electrical circuit diagram and the pneumatic circuit diagram of a control system are shown below. Which statements about the mode of action are correct? Two answers are correct.
As long as no pushbutton is pressed, the directional control valve remains in the retracted end position.
If one of the two pushbuttons is pressed, the directional control valve remains in the retracted end position.
The piston rod of the cylinder is to be advanced only if both pushbuttons S1 and S2 are pressed.
The piston rod is advanced. When one of the two pushbuttons is released, the directional control valve switches to the normal position. The piston rod is retracted.
The piston rod of the cylinder is to be advanced if either of the two pushbuttons S1 or S2 is pressed.
Which statement about detecting the advanced or retracted end position of a piston rod, as shown below, is correct?
The contact reeds are opened by a magnetic field.
The field of a magnet causes the two reeds to close, allowing current to flow.
Reed switches have a long service life but have a long switching time.
In contrast to proximity switches, reed switches operate independently and without an external mechanical actuating force.
An electrostatic field causes the two reeds to close.
For the pneumatic circuit diagram shown below, what happens, when valve 1V is briefly actuated?
Cylinder 1A extends a little and then stops in this position.
Cylinder 1A extends and stops in the forward end position.
Cylinder 1A extends and retracts so long as valve 1V1 is not briefly actuated.
Cylinder 1A extends out to the forward end position and then immediately retracts again.
Cylinder 1A extends a little and then immediately retracts again.
For the electropneumatic controlled system shown below, which statements about the operating sequence of the components are correct? Two answers are correct.
The electrical circuit for solenoid coil 1Y2 is closed via limit switch 1S1.
When S1 is pressed the electrical circuit for the solenoid coil 1Y1 is closed and the piston rod of the cylinder advances to the forward end position.
After leaving the rear end position, the electrical circuit for the solenoid coil 1Y1 is opened via limit switch 1S1.
The electrical circuit for the solenoid coil 1Y1 is closed via limit switch 1S2.
By pressing of S1 the electrical circuit for solenoid 1Y1 is closed. When S1 is released the electrical circuit for 1Y1 is opened.
For the pneumatic circuit diagram shown below, which task does valve 1V2 do?
It serves to set the forward speed of cylinder 1A.
It stops the piston rod of cylinder 1A in the present position, when there is a sudden drop of pressure.
It brakes the piston of the cylinder 1A shortly before reaching its stroke end.
It blows off free, when the pressure rises above the set value.
It serves for setting the piston force of the cylinder 1A when advancing.
Which of the following statements about the operation of the cylinders 1A and 2A shown below is correct?
The piston rod of cylinder 1A retracts unthrottled.
The retracting movement of cylinder 2A is throttled.
The exhaust air is throttled when cylinder 1A retracts.
The piston rod of cylinder 2A advances unthrottled.
The piston rods of both cylinders advance unthrottled and retract throttled.
In the control circuit shown below, which action will trigger the extension of cylinder 2A?
By activating the proximity sensor 1B1.
By activating the limit switch 2S2.
By cylinder 1A leaving the forward end position.
By activating the limit switch 2S1.
By activating the proximity sensor 1B2.
Which statement about the operation of the control circuit shown below is correct?
After pushing S1 cylinder 2A extends immediately.
After pushing S1 cylinder 1A retracts immediately.
After pushing S1 cylinder 1A retracts 10s later.
After pushing S1 cylinder 2A extends 10s later.
After pushing S1 cylinder 2A retracts 10s later.
The text below represents the logical association between transition conditions. Which of the transition conditions represented by Boolean expressions, logic symbols and standardized circuit symbols are correct? Two answers are correct.
Solution A
Solution B
Solution C
Solution D
Solution E
For a time-limited operation that is executed in Step 1, which letter is to be used in field "a" of the command field?
L
D
N
S
P
Which statement about the parts of a command field in a function chart shown below is correct?
The effect of the command, for example to retract a cylinder drive, is shown in field "a".
The feedback signal acknowledging execution of a command is entered in field "c".
The signal, for example in the form of a number or by specifying the corresponding sensor is shown in field "b".
The information, that an output of the PLC is only actuated for this step, is shown in field "c".
The types of commands are indicated by numbers in field "a".
The displacement step diagram and the pneumatic circuit diagram of a control system are shown in Figure (a). The system does not work as expected as you can see from the simplified displacement step diagram in Figure (b). What could be the cause?
There is a leak between the valves 2V2 and 2V3.
Limit switch 1S2 does not actuate valve 2V1.
The supply port and working port of 1V4 are accidentally interchanged.
The supply port and working port of 2V4 are accidentally interchanged.
Limit switch 1S2 accidentally actuates the valve 1V2.
After exchanging the adjustable one-way flow control valve 1V2 in the control circuit shown below the supply port and working port are accidentally interchanged. Which would be the effect of this mistake on the operation of the control circuit?
The piston rod of cylinder 1A will retract unthrottled at all times.
Both chambers of cylinder 1A will be pressurized and its piston rod will remain in mid-position.
After retracting cylinder 1A, it can not be brought in the extended end position anymore.
The piston rod of cylinder 1A will be permanently in the forward end position.
The piston rod's retracting movement will be throttled
In the pneumatic controlled system shown below, the cylinder does not extend. Given the following measurements, what could be the possible cause of the malfunction?
Cylinder 1A
Valve 1V1
Solenoid coil 1Y2
Adjustable one-way flow control valve 1V2
Adjustable one-way flow control valve 1V3
In the pneumatic controlled system shown below, the cylinder does not retract. Given the following measurements, what could be the possible cause of the malfunction?
Cylinder 1A
Valve 1V1
Solenoid coil 1Y2
Adjustable one-way flow control valve 1V2
Adjustable one-way flow control valve 1V3
