FEB - 2012Slide 1

Task No.: Point(s): 1 Only one answer is correct. Cat. No.

To measure electrical …

A current, the ammeter must be in line 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.

B

C

D

E

TEST QUESTION 1

A

FEB - 2012Slide 2

Task No.: Point(s): 2 Two answers are correct. Cat. No. 1.3As shown below, a through-beam sensor with fibre-optic cable is used to detect workpieces on a work piece carrier. Which of the following statements about the optical sensors adapted for use with fibre-optic cables are correct?

A In the case of failure of the light emitter is evaluated as “work piece not present”.It is possible to detect work pieces in areas of restricted access, e.g. through holes.The response range is accurately determined by the aperture of the fibre-optic cable ends. This makes possible an accurate lateral approach, even with small work pieces.It is possible to detect completely transparent work pieces.

It is not suitable for aggressive environments.

B

C

D

E

TEST QUESTION 4

B,C

FEB - 2012Slide 3

Task No.: Point(s): 2 Two answers are correct. Cat. No.

Which statements about the mode of operation of a reflective light barrier shown below are correct?

A 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 sensorto switch.Failure of the transmitter is evaluated as “object present”.

Failure of the transmitter is evaluated as “no object present”.

An advantage is that both transparent and reflecting objects can be detected.

B

C

D

E

B,C

TEST QUESTION 6

FEB - 2012Slide 4

Task No.: Point(s): 2 Two answers are correct. Cat. No. 1.3If 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?

A Increase in VRDecrease in IMOTORIncrease in IMOTORDecrease in VRDecrease in Analog Output Signal

B

C

D

E

A,C

TEST QUESTION 7

FEB - 2012 Slide 5

Task No.: Point(s): 2 Only one answer is correct. Cat. No. 1.3

By looking at the given measuring results of the electrical circuit shown below, determine the type of failure in the circuit.

A 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.

Measuring Results: Vs = 24 V VAD = 24 V VBD = 24 V.

B

C

D

E

A

TEST QUESTION 8

FEB - 2012 Slide 6

Task No.: Point(s): 2 Only one answer is correct. Cat. No. 1.2In the control system shown below, after PLC output X.0 is “ON”, the voltage measured across …

A 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.

B

C

D

E

4S1, 4S2: Limit Switches K4: Forward Contactor K5: Reverse Contactor

D

TEST QUESTION 9

FEB - 2012 Slide 7

Task No.: Point(s): 2 Two answers are correct. Cat. No. 1.3A lamp circuit is shown below. It is assumed that one of the three bulbs is burned out. Which of the following conclusions are correct? …

A 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.

B

C

D

E

A,D

TEST QUESTION 11

FEB - 2012 Slide 8

TEST QUESTION 16

Task No.: Point(s): 2 Only one answer is correct. Cat. No. 1.3By observing the meters in the electrical circuit shown below, determine the type of failure in the circuit and which component failed.

A R1 is shorted.

R2 is shorted.

R3 is shorted.

R4 and R5 are open.

R1 and R2 are shorted.

B

C

D

E

E

FEB - 2012 Slide 9

TEST QUESTION 19

Task No.: Point(s): 1 Only one answer is correct. Cat. No. 5

At the operator panel you find out that the output of the PLC to execute the next step is set, but this step is not executed. Which action should you take to find the fault?

A

verifying input signals of the PLC

checking the signals between sensor and input module of the PLC

checking the signals between output module and actuator

switching off the control voltage

measuring the supply voltage and output voltage at the sensor

B

C

D

E

C