Siemens Level 1 sample exam

...an XOR gate.

A system contains two identical circuits operating in parallel as shown below. As long as both are operating properly, the outputs of both circuits are always the same. If one of the circuits fails, the outputs will be at opposite levels. To indicate the failure, the outputs of the circuits are connected to the inputs of ... One Answer is correct ...a NOR gate. ...an OR gate. ...an XOR gate. ...an XNOR gate. ...a NAND gate.

B: It is possible to detect parts in areas of restricted access, e.g. through holes. E: A broken fiber-optic cable at the light emitter is evaluated as "work piece present".

As shown below, a through-beam sensor with fiber-optic cable is used to detect parts on a workpiece carrier. If no part is present, the sensor sends a high signal to the PLC. Which of the following statements about the operation of the sensor are correct? Note: Two answers are correct. A: Power failure of the light emitter is evaluated as "work piece not present". B: It is possible to detect parts in areas of restricted access, e.g. through holes. C: It is possible to detect completely transparent work pieces. D: Cable break on the receiver side is evaluated as "work piece not present". E: A broken fiber-optic cable at the light emitter is evaluated as "work piece present".

Incorrect: *NOT 0.9 V 0.5ms 2.0Khz* Incorrect: 1.8 V 1ms 1.0Khz

Based on the control settings, find the peak-to-peak amplitude and the period of the waveform displayed on the scope screen and calculate the frequency. Note: One answer is correct Vpp T F 0.9 V 0.1ms 10Khz 0.9 V 0.5ms 2.0Khz 1.8 V 1ms 1.0Khz 1.8 V 0.5ms 2.0Khz 2.4 V 1ms 1.0Khz

64 combinations

Determine the number of possible combinations of a six digit binary number. One Answer is correct 6 combinations 16 combinations 32 combinations 64 combinations 128 combinations

-L

For a time-limited operation that is executed in Step 1, which letter is to be used in field "a" of the command field? One Answer is correct -L -D -N -S -P

19,200 bits

If a given memory unit consists of 2,400 bytes the memory capacity would be rated: One Answer is correct 2,400 bits 4,800 bits 9,600 bits 19,200 bits 38,400 bits

Increase in voltage drop across sensing resistor R Increase in motor current IMotor

If an object were caught in the upward movement of the car window, stalling the motor, what effect would this have on the window control circuit for a car door shown below? Note: Two answers are correct. Increase in voltage drop across sensing resistor R Decrease in motor current IMotor Increase in motor current IMotor Decrease in voltage drop across sensing resistor R Decrease in Analog Output Signal

... OR instruction.

If you want to know when one or both matching bits in two different words are logic '1' you would use the ... One Answer is correct ... AND instruction. ... OR instruction. ... NOT instruction. ... XOR instruction. ... NAND instruction.

... branchs.

Parallel connections of a ladder logic program are typically called ... One Answer is correct ... rungs. ... branchs. ... loops. ... inputs. ... outputs.

Y = (A) + (CD) + (BC)

The Boolean equation for the logic represented in the ladder diagram shown below can be expressed as ... One Answer is correct Y = (A) + (CD) + (BC) Y = (A) + (B) + (CD) Y = (A) + (CD) + (BC) Y = A(BCD) Y = (AB) + (CD)

189.375

The conversion of the floating point binary number 1011 1101.0110 to decimal is ... One Answer is correct 187.625 189.375 189.625 190.375 191.375

... limited only by the memory size.

The maximum number of networks allowed in a Step 7 program is ... One Answer is correct ... 1. ... 8. ... 256. ... 1024. ... limited only by the memory size.

... limited only by the memory size.

The maximum number of outputs allowed per network in a Step 7 program is ... One Answer is correct ... 1. ... 4. ... 8. ... 16. ... limited only by the memory size.

C

There are metal work pieces on a circular conveyor belt. The position of the work piece carrier is detected by a switch that is magnetically sensitive. The block diagram of the sensor is shown below: Note: One answer is correct C D E B A

current, the ammeter must be in series with the current path.

To measure electrical ... Note: Only one answer is correct. current, the ammeter must be in series with the current path. voltage, you must disconnect a component lead or a wire before you connect the voltmeter. resistance, connect the ohmmeter across the component without disconnecting the supply voltage. resistance, the ohmmeter must be placed in series with the component. none of the above.

It prevents a hard striking of the piston at the end positions.

What is the use of end position cushioning of a double-acting cylinder, as shown below? One Answer is correct -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.

It prevents a hard striking of the piston at the end positions.

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.

Variable signal

What kind of signal varies continuously? One Answer is correct Analog signal Variable signal Digital signal Discrete signal Permanent signal

Brushes

Which component has to be maintained most often in a small DC machine? Only one answer is correct Armature Brushes Permanent Magnets Bearings Commutator

-3/2- way valve

Which component is represented symbolically? -3/2- way valve -5/2- way valve -4/2- way valve -5/3-way valve -Quick exhaust valve

Quick exhaust valve

Which component is represented symbolically? 2/2- way valve 3/2- way valve Shuttle Valve Vacuum Generator Quick exhaust valve

Timing Belts Power Screws

Which components are used for energy transport between different machine units of a system? Two answers are correct Timing Belts Washers Bearings Screws Power Screws

A

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

If both pulleys are properly aligned, all four edges of the pulleys (1, 2, 3, and 4) should be touching the straight edge. If the pulleys are not aligned, the belt will run up against the pulley flanges causing excessive belt wear.

Which statements about the installation and adjustment of the synchronous belt drive shown below are correct? Two answers are correct If both pulleys are properly aligned, all four edges of the pulleys (1, 2, 3, and 4) should be touching the straight edge. After installation, it is important to check the tension of the belt while the machine is running. Loosening of both pulleys is always required to properly align the belt. If the pulleys are not aligned, the belt will run up against the pulley flanges causing excessive belt wear. If the pulleys are not aligned, the belt still remains perfectly centered on the pulleys.

Shuttle Valve

Which component is represented symbolically? 2/2- way valve 3/2- way valve Shuttle Valve Vacuum Generator Quick exhaust valve

Vacuum Generator

Which component is represented symbolically? 2/2- way valve 3/2- way valve Shuttle Valve Vacuum Generator Quick exhaust valve

Pressure regulation valve with adjusting knob - A Air filter with water separator - C

Which components in the air supply unit, as shown below, are correctly identified? Note: Two answers are correct. Pressure regulation valve - C Air filter - A Pressure gauge - C Pressure regulation valve with adjusting knob - A Air filter with water separator - C

-Filter, pressure regulating valve, lubricator

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

Up/Down counter

Which of the following counter is available in STEP 7? One Answer is correct Up/Up counter Up/Down counter Retentive Down counter Reset counter Incremental counter

-Diagram A

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?One Answer is correct -Diagram A -Diagram B -Diagram C -Diagram D -Diagram E

C AND D

Which of the following input combinations will definitely result in an output? One Answer is correct A AND B AND C A AND NOT B AND NOT C NOT C AND D C AND NOT D C AND D

Bearing a, c and d.

Which of the following rolling contact bearings are able to absorb thrust forces at least from one side? Only one answer is correct Bearing b and e. Bearing a, c and d. Bearing a and d. All bearings. None of the answers given.

E

Which of the following statements about advantages and disadvantages of pneumatics is correct? One Answer is correct A B C D E

The rotation speed of the upper shaft is smaller than the speed of the lower shaft.

Which of the following statements about the gear train shown in the picture below is not correct? Only one answer is correct The module of both gears has to be the same. The pictured gears are used to lower the noise in operation. The gear train exerts thrust (axial) forces. The rotation speed of the upper shaft is smaller than the speed of the lower shaft. The torque of the upper shaft is smaller than the torque of the lower shaft.

-The directional control valve 1V1 has four ports, two switching positions and is electrically actuated. -The force for advancing the cylinder 1A is higher than the force for retracting it.

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.

The lamp will be connected to the storage battery as long as the relay remains de-energized. As long as the main power is available, it energizes the relay coil.

Which of the following statements about the functionality of the emergency lighting circuit, as shown below, are correct? Note: Two answers are correct. In the event of main power failure, the emergency lamp is not lighted. The lamp will be connected to the storage battery as long as the relay remains de-energized. As long as the main power is available, it energizes the relay coil. Since the relay coil is energized, the N.C. contact is open and the emergency lamp is lighted. In the event of main power failure, the secondary of the transformer keeps the battery charged through the rectifier.

-The exhaust air is throttled when cylinder 1A retracts.

Which of the following statements about the operation of the cylinders 1A and 2A shown below is correct? One Answer 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.

Adjustable one-way flow control valve 1V2.

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.

Contactor activated: 400 V between terminal 1 and 4. Contactor activated: 400 V between terminals 1 and 6

A 24 V DC contactor controls a 3-phase AC motor (230V/400V). Which of the following measurements are correct? Note: Two answers are correct Contactor activated: 400 V between terminal 1 and 4. Contactor activated: 400 V between terminals 1 and 6 Contactor not activated: 400V between terminal 33 and earth. Contactor not activated: 0V between terminals 3 and 5. Contactor activated: 230V between terminals 1 and 2.

4.4 kohms

A Wheatstone bridge is used in a temperature-sensing application. The temperature of a liquid in an industrial process is monitored using a thermistor in one branch of the bridge, as shown below. From the graph of thermistor resistance versus temperature, the calculated resistance value to which the potentiometer R2 must be set in order to balance the bridge at 60°C is: Note: One answer is correct 4.4 kohms 5.6 kohms 6.8 kohms 8.2 kohms 3.3 kohms

More torque ripple and more noise. Less maximum torque.

A frequency inverter has a malfunction: one low-side switch is broken and as a result always opens. Result for the driven asynchronous machine: Two answers are correct Half of the speed. More torque ripple and more noise. Less maximum torque. Much less no-load speed. The maximum torque will increase and possibly break the machine.

a solenoid operated directional control valve.

A part of a product data sheet is shown below. The product information belongs to ... a shuttle valve. a shut-off valve. a pressure actuated switch. a solenoid operated directional control valve. a non-return valve.

When the carriage is not located at the end of travel points, both limit switches are not triggered (contacts are open). If both motor contactors are accidentally energized at the same times, a short occurs.

A part placed on a carriage must be transferred forward from the left-most to the right-most position and than back to its start position, as shown below. Which of the following statements about the mode of operation are correct? Note: Two answers are correct. If PLC output Q5.0 is switched on, the carriage moves forward until limit switch 4S1 is not triggered anymore. If PLC output Q5.1 is switched on, the carriage moves forward until limit switch 4S2 is triggered. When the carriage is not located at the end of travel points, both limit switches are not triggered (contacts are open). If both motor contactors are accidentally energized at the same times, a short occurs. PLC input I1.6 is switched to "High" when the carriage has reached its start position.

-The valve has 5 ports.

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.

The speed could get very high and probably destroy the machine.

A pump is connected with a clutch to a series-wound DC machine. What happens with the machine if the clutch is suddenly opened during operation? Only one answer is correct The speed could get very high and probably destroy the machine. The machine gets very hot. The speed breaks down to zero. The motor's voltage will directly increase. Nothing; the machine will continue to run at the rated speed.

While cylinder 2A advances, cylinder 1A remains in the actuated position.

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 1A 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.

The swivel arm's rotation cylinder is operated by the 5/3-way double solenoid valve +SWIV-1V1. As long as solenoid +SWIV-Y3 of DCV +SWIV-1V2 is energized, vacuum is switched on.

A swivel arm unit and its corresponding pneumatic circuit diagram are shown below. Which statements about the operation are correct? Note: Two answers are correct. If both solenoids +SWIV-Y1 and +SWIV-Y2 are de-energized, the swivel arm moves until it reaches an end position. The end positions of the swivel are detected by +SWIV-1V2 or +SWIV-1V3. The swivel arm's rotation cylinder is operated by the 5/3-way double solenoid valve +SWIV-1V1. As long as solenoid +SWIV-Y3 of DCV +SWIV-1V2 is energized, vacuum is switched on. +SWIV-B3 represents a pressure actuated sensor with switching function.

The piston rod of cylinder 1A will retract unthrottled at all times.

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

... 0110 0100.

An 8-bit binary counter has to count balls going into a box from a conveyor belt. A sensor detects the passing of a ball. If it has counted one hundred balls, the binary value of the counter is ... One Answer is correct ... 0110 0010. ... 0110 1000. ... 0110 0100. ... 0001 0100. ... 0000 0100.

˜ 1.2 V, 3000 r.p.m.

An automotive application involves an inductive sensor that detects the crankshaft positionto adjust the fuel control system. The result of a test measurement at the output of thesensor is shown below. The magnitude and rotational speed are ...Note: Only one answer is correct.r.p.m. = revolutions per minute ˜ 1.2 V, 1000 r.p.m. ˜ 1.2 V, 3000 r.p.m. ˜ 12 V, 1200 r.p.m. ˜ 1.2 V, 12,000 r.p.m. ˜ 12 V, 300 r.p.m.

There is malfunction in the cooling system. The load increased.

An electrical DC machine gets too hot during operation. What could be the cause? Two answers are correct There is malfunction in the cooling system. The load increased. The supply voltage broke down. The load decreased. The brushes broke and have to be maintained.

140 rpm

An image of the internals of an automotive differential are shown below. The pinion gear with 14 teeth is driving the ring gear with 42 teeth. If the pinion turns at 420 rpm, what will be the speed of the ring gear? Only one answer is correct 42 rpm 140 rpm 160 rpm 110 rpm 1260 rpm

pe = 5.5 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

parallel paths.

Branch instructions are used to create: One Answer is correct series paths. parallel paths. a series of energized output conditions. parallel connection of networks. none of the above.

There is a short between A and B.

By looking at the given measuring results of the electrical circuit shown below, determine the type of failure in the circuit. Note: Only one answer is correct. Measuring Results: Vs = 24 V VAD = 24 V VBD = 24 V There is a short between A and B. There is a short between B and GND. There is a short between D and -Vs. Between A and B is an open circuit. Between A and + of Vs is an open circuit.

There is a solder splash short circuit between point A and point B.

By reading the multimeters in the electrical circuit shown below, determine the type of failure in the circuit and which component failed. Note: One answer is correct There is a solder splash short circuit between point A and point B. R2 is shorted. R1 is shorted. R4 and R5 are open. R3 is shorted.

B: If sensor 1B1 is triggered but does not send a signal to PLC input I0.5, an input error has occurred.

For a pallet lift and feeding application the pneumatic circuit diagram and function chart are shown below. The pallet lift cylinder extends but the pallet feed cylinder fails to extend. Which statement about the error situation is correct? Note: One answer is correct A: Step 2 was the last step that was still carried out by the system, Step 3 is not executed. B: If sensor 1B1 is triggered but does not send a signal to PLC input I0.5, an input error has occurred. C: If PLC output Q3.7 is switched on, solenoid 2M2 can be the cause of the problem. D: The pallet feed cylinder fails to extend because PLC output Q4.0 is not activated. E: Possibly involved in the error situation are sensor 2B1 and solenoid 1M2.

-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.

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.

-pe = 2.75 bar

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 = 2.75 bar -pe = 4.5 bar -pe = 5.5 bar -pe = 6.5 bar

Cylinder 1A extends a little and then immediately retracts again.

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.

-It serves to set the forward speed of cylinder 1A.

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.

NAND gate

Given below is the truth table of a 3-input logic gate. Which logic gate represents the behavior between inputs and outputs according to the truth table? One Answer is correct NAND gate AND gate NOR gate OR gate XOR gate

s2=1cm

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

-By installation of a quick exhaust valve instead of the one-way flow control valve 1V2

How can the piston speed of cylinder 1A be greater during retraction than it is in extension for the control system shown below?One Answer is correct -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

Exchange two terminals with each other.

How could you change the direction of rotation for an asynchronous machine (ASM) with squirrel cage? Only one answer is correct Use secondary shaft on opposite side. Exchange three terminals with each other. Exchange two terminals with each other. Possible only with mechanical solutions (gear box and clutch). Apply negative voltage to the terminals.

... reading the status of inputs, evaluating control logic, and updating outputs.

In PLC operation, a scan is usually a sequential process of ... One Answer is correct ... reading control logic, evaluating outputs, and updating inputs. ... writing control logic, evaluating outputs, and updating inputs. ... reading/writing the status of inputs and updating outputs. ... reading the status of inputs, evaluating control logic, and updating outputs. ... updating and evaluating inputs according to control logic and updating outputs.

... coil symbols.

In programs that are written in ladder logic, all outputs are represented by ... One Answer is correct ... contact symbols. ... coil symbols. ... schematic load device symbols. ... either a or b, depends on the output interface module. ... negative contact symbols when relays are connected to outputs.

-By activating the proximity sensor 1B2.

In the control circuit shown below, which action will trigger the extension of cylinder 2A? One Answer is correct -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.

Incorrect: The reed switch contacts are operated by an electric field coming from the piston of cylinder 2A1. If the electro magnet attached to the piston of cylinder 2A1 is moved over the glass tube of the reed switch, the contact closes.

In the feeding application, as shown below, reed switch sensors are used as cylinder limit switches. Which of the following statements about the functioning of the reed switch sensors are correct? Note: Two answers are correct. A reed contact consists of a ferromagnetic switching contact protected in a small glass tube. If a permanent magnet is moved over the glass tube of the reed switch, the contact opens. If the permanent magnet attached to the piston of the cylinder is moved over the glass tube of the reed switch, the contact closes. The reed switch contacts are operated by an electric field coming from the piston of cylinder 2A1. If the electro magnet attached to the piston of cylinder 2A1 is moved over the glass tube of the reed switch, the contact closes.

The friction plates in the clutch are loosely set.

In the mechatronic subsystem shown below, when the forward contactor is activated and Motor M rotates, which of the following statements could be true if the carriage does not move in the forward direction? Note: Only one answer is correct. The friction plates in the clutch are loosely set. The friction plates in the clutch are tightly set. The contacts of reverse contactor K2 are accidentally closed. There is no output signal from limit switch 2. Limit switch 2 is not properly adjusted.

D: In Figure (d) a 3/2-way valve, normally open is shown.

In which of the following statements does the symbol correspond to the given description? One Answer is correct A: In Figure (a) a valve is actuated by pressured air. B: In Figure (b) a valve is actuated electro-magnetically. C: In Figure (c) a valve is actuated manually. D: In Figure (d) a 3/2-way valve, normally open is shown. E: In Figure (e) a 5/2-way valve pressure actuated is shown.

The switching distance of sensor (b) is typically 25 cm (adjustable within the range of 10 to 80 cm). The measuring range of both sensors is the same. Sensor (a) provides an analog output signal. Sensor (b) has a switching output.

Specifications and output pattern of two distance measuring sensors are shown below. Which statements about the functionality are correct? Note: Two answers are correct. Sensor (a) provides an analog output signal. The higher the detecting distance, the higher the analog output voltage. The switching distance of sensor (b) is typically 25 cm (adjustable within the range of 10 to 80 cm). The power consumption of sensor (a) is higher then the power consumption of sensor (b). The measuring range of both sensors is the same. Sensor (a) provides an analog output signal. Sensor (b) has a switching output. The output voltage at a detecting distance of 50 cm of both sensors is the same.

-The shuttle valve performs and "OR" function. The cylinder extends by either hand "OR" foot actuation. -The shuttle valve is switched based on the compressed air entering into either input connection 1 and leaving via an output connection 2

The Cross section of a shuttle valve and an application are shown below. Which of the following statements about the operation of the single-acting cylinder are correct? Two answers are correct. -The shuttle valve performs and "AND" function. The cylinder extends only by hand "AND" by foot actuation. -The shuttle valve performs and "OR" function. The cylinder extends by either hand "OR" foot actuation. -The shuttle valve is switched based on the compressed air entering into either input connection 1 and leaving via an output -The shuttle valve increases the return stroke speed of the single-acting cylinder. -The shuttle valve increases the forward stroke speed of the single acting cylinder.

Incorrect: Process - image input table

The PLC program is uploaded from the programming device into the PLC. Into which specific CPU-Memory of the PLC is the program loaded? One Answer is correct Block stack Load memory System memory Process - image input table Work memory

... accept inputs, make logical decisions, and send outputs.

The basic function of a PLC is to ... One Answer is correct ... amplify various weak signal sources. ... control the speed of motors. ... accept inputs, make logical decisions, and send outputs. ... control a high voltage output with a low voltage input. ... convert nonelectrical quantities into electrical voltage.

2mm

The builder of the automotive racing engine shown in the picture decided to use socket head cap screws to attach the valve covers. What is the pitch of the screws used? Only one answer is correct 2mm 12mm 34mm 54mm 18mm

-The relay K1 with latching function is to be used for signal storage. -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 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.

-As long as no pushbutton is pressed, the directional control valve remains in the retracted end position. -The piston rod of the cylinder is to be advanced if either of the two pushbuttons S1 or S2 is pressed.

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.

-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.

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? Two Answers 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 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.

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? Two Answers 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.

1.0 kohm(s) 2.2 kohm(s) 4.7 kohm(s)

The figure below shows a graph of current as a function of voltage for three resistance values. Determine R1, R2, and R3. Note: One answer is correct 1.0 ohm(s) 4.7 ohm(s) 3.3 ohm(s) 4.7 ohm(s) 2.2 ohm(s) 1.0 ohm(s) 1.0 kohm(s) 2.2 kohm(s) 4.7 kohm(s) 4.7 kohm(s) 2.2 kohm(s) 3.3 kohm(s) 1 Mohm(s) 2.2 Mohm(s) 4.7 kohm(s)

Register A: 1000 0110 Comparator input B: 0101 0110

The following digital system controls the number of work pieces going into a carton. The preset number of 86 is entered on the keypad and also appears on the 7-segment display. What is the specified content of register A and the data on 8-bit input B of the comparator when the carton is full? One Answer is correct Register A: 1000 0110 Comparator input B: 0101 0110 Register A: 1000 0110 Comparator input B: 0110 1000 Register A: 0110 1000 Comparator input B: 0101 0110 Register A: 1000 0110 Comparator input B: 1000 0110 Register A: 0101 0110 Comparator input B: 0101 0110

Sensor IN6_SENS6 The solenoid operated directional control valve to operate pick-up cylinder 10A1.

The function diagram and function chart of a pick and place system are shown below. After the vacuum was switched on at the pick-up position (you can here the noise at the exhausting port), the pick-up cylinder 10A1 fails to retract. Which component can be the possible cause of this failure? Note: Two answers are correct. Sensor 10B1 Sensor IN6_SENS6 Sensor 9B1 The solenoid operated directional control valve to operate pick-up cylinder 10A1. The solenoid operated directional control valve to operate vacuum generator 11A1.

Check PLC output Q3.7. Use the manual override of DCV 1V1 that operates the pallet feed cylinder 1A.

The function diagram and the function chart of a feeding and lifting device are shown below. The pallet lift cylinder 2A extends, sensor 2B2 is triggered, status indicator of PLC I0.5 is on, the pallet feed cylinder 1A does not extend. What makes sense to do next to fix the problem? Note: Two answers are correct. Check the cable between sensor 2B2 and PLC input I0.5. Check PLC output Q3.7. Check PLC output Q3.5. Use the manual override of DCV 1V1 that operates the pallet feed cylinder 1A. Measure the supply voltage of sensor 2B2.

Non-symmetrical stator windings. Non-ideal net situation.

The ideal rotating magnetic field in the stator of a three-phase machine is deformed by: Two answers are correct Group of answer choices High no-load speed. Non-symmetrical stator windings. Wrong direction of rotation. Non-ideal net situation. Alternating voltages and currents.

The teeth of both gears must be the same size. The shafts must be parallel

The internals of an automotive gearbox are shown below. What condition must hold true if any two gears of the type shown are to mesh properly? Two answers are correct The teeth of both gears must be the same size. Both gears must have the same outer diameter. The teeth must be produced by hobbing in order to ensure proper mating. The shafts must be parallel None of the above .

... process image input file.

The status bit of switches and pushbuttons connected to a PLC input module are stored in the ... One Answer is correct ... process image input file. ... process image output file. ... user program. ... in the ROM. ... none of the above.

Annoying noise.

The switching frequency of a power electronic for a DC machine is set to 2 kHz. This could cause: Only one answer is correct Torque ripples. Annoying noise. More losses than necessary. High armature currents. Nothing; 2 kHz is an appropriate switching frequency and often used in industries.

... can be thought of as a contact that is usually opened.

The symbol shown below in the ladder diagram ... One Answer is correct ... can be thought of as a contact that is usually closed. ... can be thought of as a contact that is usually opened. ... represents a capacitor. ... is always a logic 0. ... is always a logic 1.

-Solution B -Solution E

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

There is an open circuit between pin 4 and pin 5 (R5 open).

The voltage divider circuit board, as shown below, does not provide the specified voltages: 24 V at pin 3 and pin 4, all other pins have 0V. The voltages specified with respect to the negative terminal of the power supply are given: Pin 1: negative terminal of the 24 V power supply Pin 2: 5.4 V ± 5 % Pin 3: positive terminal of the 24 V power supply Pin 4: 20.8 V ± 5 % Pin 5: 16.0 V ± 5 % Pin 6: 14.6 V ± 5 % Pin 7: 2.0 V ± 5 % The circuit does not provide the specified voltages. Identify the likely fault for the following case: 24 V at pins 3 and 4. All other pins have 0 V. Note: One answer is correct There is an open circuit between pin 4 and pin 5 (R5 open). There is a solder splash between pin 4 and pin 5. There is a cable break between pin 1 and the negative terminal of the 24 V power supply. There is a solder splash between pin 6 and pin 7. There is an open circuit between R5 and R6.

-The retraction of the piston is usually achieved by a spring.

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.

-The field of a magnet causes the two reeds to close, allowing current to flow.

Which statement about detecting the advanced or retracted end position of a piston rod, as shown below, is correct? One Answer 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.

-The stream of air flow can be continuously adjusted.

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.

-After pushing S1 cylinder 1A retracts immediately.

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 feedback signal acknowledging execution of a command is entered in field "c".

Which statement about the parts of a command field in a function chart shown below is correct?One Answer 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".

-a double solenoid valve position is unchanged.... -a spring-return valve combined with a dominant "ON" latching circuit moves to the neutral position....

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.

-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. -Y is a knob for adjusting the spring force of the return spring.

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.

Incorrect: If S1 is pressed the motor will rotate in the forward direction until S3 or S2 are pressed. If "STOP" and "START" are both pressed at the same time nothing will happen. Both contactors K1 and K2 cannot be activated at the same time to prevent short circuit?

Which statements about the mode of operation of the forward/reverse control circuit, as shown below are correct? Note: Two answers are correct. If S1 is pressed the motor will rotate in the forward direction until S3 or S2 are pressed. To stop the motor S3 has to be pressed or S1/S2 (depending on direction) have to be pressed. Both contactors K1 and K2 cannot be activated at the same time to prevent short circuit? To change the rotation direction during operation, S3 has to be pressed first to stop the motor. If "STOP" and "START" are both pressed at the same time nothing will happen.

A: To achieve a required safety level, the drilling station is equipped with two pushbuttons (S1 and S2) allowing two-hand operation. E:If the coil of the motor contactor K1 is energized (24V DC is applied) and the contact of the motor circuit is closed but the drill motor does not start, a possible cause of the problem is the 230V AC motor.

Which statements about the operation of the drilling station, as shown below, are correct? Note: Two answers are correct. A: To achieve a required safety level, the drilling station is equipped with two pushbuttons (S1 and S2) allowing two-hand operation. B: The drill motor is switched on when a part is present (contact of B1 is closed) and one of the pushbuttons is pushed. C: If both pushbuttons are pressed and the contact of sensor B1 is closed, it is not possible to start the drill motor. D:If the coil of the motor contactor K1 is energized (24V DC is applied) but the drill motor does not start, a possible cause of the problem can be sensor B1. E:If the coil of the motor contactor K1 is energized (24V DC is applied) and the contact of the motor circuit is closed but the drill motor does not start, a possible cause of the problem is the 230V AC motor.

-Picture D

Which symbol represents a pilot controlled 5/2-way double solenoid valve? -Picture A -Picture B -Picture C -Picture D -Picture E

The wiper arm of the potentiometer R is disconnected from its resistive element. There is a short between point A and C of the potentiometer.

While checking the functionality of the circuit shown below, you set the wiper arm of the potentiometer R from point B to point A. The lamp is on but the brightness of the lamp cannot be regulated. What can be the source of the problem? Note: Two answers are correct. There is a disconnection between the fuse and the switch. The wiper arm of the potentiometer R is disconnected from its resistive element. There is a short between point B and C of the potentiometer. There is a short between point A and C of the potentiometer. The fuse is blown.