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WorksheetsSiemens Level 1 Electrical #2
Total questions: 19
Worksheet time: 38mins
To measure electrical …
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.
As shown below, a through-beam sensor with fiber-optic cable is used to detect parts on a work piece 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? Two answers are correct.
Power failure of the light emitter is evaluated as “work piece not present”.
The presence of the work piece can only be detected if the light beam is visible.
It is not possible to detect completely transparent work pieces.
Fiber-optic cable break on the receiver side is evaluated as “work piece not present”.
A broken fiber-optic cable at the light emitter is evaluated as “work piece present”.
An automotive application involves an inductive sensor that detects the crankshaft position to adjust the fuel control system. The result of a test measurement at the output of the sensor is shown below. The magnitude (Vpp) and rotational speed are …
≈ 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.
Which of the following statements about the functionality of the emergency lighting circuit, as shown below, are correct? 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.
Which statements about the mode of operation of a reflective light barrier shown below are correct? Two answers are correct.
If no object is present, the reflector must absorb the light emission.
The interruption of the light beam by an object causes the output of the sensor to switch.
Failure of the transmitter is evaluated as “object present”.
No voltage between BN(1) and BU(3) is evaluated as “no object present”.
An advantage is that both transparent and reflecting objects can be detected.
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? 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
By looking at the given measuring results of the electrical circuit shown below, determine the type of failure in the circuit.
There is a short between A and B.
There is a short between B and GND.
There is a open between D and -Vs.
Between A and B is an open circuit.
Between A and + of Vs is an open circuit.
In the control system shown below, after PLC output X.0 is “ON” and K4 is energized, the voltage measured across …
terminal K4-14 and K4-24 should be 0V.
terminal K4-13 and K4-14 should be 24V.
terminal K4-23 and K4-24 should be 24V
terminal K5-14 and K5-24 should be 24V.
terminal K5-13 and K5-23 should be 0V.
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?
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.
A lamp circuit is shown below. It is assumed that one of the three bulbs is burned out. Which of the following conclusions are correct? … Two answers are correct.
The open branch of the circuit does not change the voltage across all parallel branches.
When an open circuit occurs in a parallel branch, the total current delivered by the source increases.
When an open circuit occurs in a parallel branch, the total current delivered by the source remains the same.
When an open circuit occurs in a parallel branch, the total current delivered by the source decreases.
The open branch of the circuit decreases the voltage across all parallel branches.
An electrical power supply is shown below. Which statements about the functionality of the circuit are correct? Two answers are correct.
The voltage between point 4 and 5 is a DC voltage.
The diode rectifier changes the AC voltage to a pulsating full-wave DC voltage that is smoothed by capacitor C1.
The voltage between point 3 and point 2 is 230 V DC.
The voltage regulator provides a constant DC voltage over a specified range of load current.
If the fuse is blown, the AC voltage between point 2 and 3 will be 230 V.
A potentiometer voltage divider is used as an automotive fuel-level sensor, as shown below. Which statement about the output voltage is correct?
If the wiper slide is moved to chassis ground, the output voltage increases.
If the wiper slide is moved to “Full”, the output voltage decreases.
The maximum of the output voltage is +10V with respect to chassis ground.
The maximum of the output voltage is +12V with respect to chassis ground.
If the potentiometer is linear and the wiper slide is in middle position, the output voltage is +6V with respect to chassis ground.
While checking the functionality of the circuit shown below, you set the wiper arm of the potentiometer R from point A to point B. The lamp is on but the brightness of the lamp cannot be regulated. What can be the source of the problem?
There is a disconnection between the fuse and the switch.
The wiper slide 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.
By observing the meters in the electrical circuit shown below, determine the type of failure in the circuit and which component failed.
R1 is open.
R3 or R4 are shorted.
R3 is shorted.
R4 and R5 are open.
R1 and R2 are shorted.
As shown below, the task of the system is to distinguish between aluminum and acrylic parts. The parts which are transferred on the conveyor belt pass under the proximity sensor B1. The material type activates the sensor output in a pre-determined combination (aluminum = 24V, acrylic = 0V). The switching distance for both material types is shown in the table below. Assuming that you run a sequence of aluminum pieces, the output of the sensor is always 0 V. What could be the cause of malfunction? Two answers are correct.
The switching distance between sensor and work piece surface is less than 3.2 mm.
The switching distance between sensor and work piece surface is 2.7 mm.
There is no supply voltage at sensor B1.
The switching distance between sensor and work piece surface is greater than 7.4 mm.
The switching distance between sensor is less than 2.7 mm.
The current error situation of the control circuit, as shown below, is described as follows: The claw is closed, motor M1 does not start. Which statements about troubleshooting are correct? Two answers are correct.
If the sensor B1 does not send a 1 signal to the PLC input I1.6, contactor K1 should be checked first.
If the sensor B1 sends a 1 signal to the PLC input I1.6 and Q5.0=1, output module 5 should be checked.
If the sensor B1 sends a 1 signal to the PLC input I1.6 and Q5.0=1, input module 1 should be checked
If the input signal I1.6 is low,the sensor B1 should be checked.
If the input i1.6 of the PLC is high and the output Q5.0 is also high, contactor K1 and motor M1 should be checked.
Which of the following statements indicate a problem with the wiring to/from an input device or with the input device itself? Two answers are correct.
Input device is energized and triggered (LED “ON”), PLC input module status indicator is “OFF”.
Input device is energized and triggered (LED “ON”), PLC input module status indicator is “ON”.
No supply voltage is applied to the input device.
The PLC output module status indicator to execute the next step is “ON” but this step is not executed.
The input device sends a signal to the PLC and the PLC input module status indicator is “ON’.
A capacitive proximity sensor is used to detect the presence of an object moving along a conveyor. At some point, the part is no longer being detected. The possible causes of this malfunction are: Two answers are correct.
The part to the sensor head distance has decreased.
The part size has increased.
The sensitivity adjustment has been altered.
The part size has decreased.
The switching distance is too small.
In the function diagram shown below, a part is pushed out from the magazine. Than it is transferred along a belt conveyor unit. Finally it is picked-up by a swivel arm via a vacuum suction cup and transferred to the next station. Which statements about the mode of operation are correct? Two answers are correct.
The swivel arm starts to move to the pick-up position of the belt conveyor unit when the part has reached the end of the conveyor unit. This is detected by sensor +BCL-B1.
The vacuum must be switched on when the swivel arm sensor +SWIV-B2 is triggered.
The micro switch +MAG-S3 checks that cube halves are present in the magazine.
Sensor +SWIV-B2 monitors the vacuum pressure at the suction cup of the swivel arm.
The swivel arm’s movement is triggered by +BCL-M1.
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