# Siemens Review – Chapters 2 and 3

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## Siemens Review – Chapters 2 and 3

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Slide1

Siemens Review – Chapters 2 and 3

Potentiometers

Slide2

A potentiometer voltage divider is used as an automotive fuel-level sensor, as shown

below. Which statement about the output voltage is correct?

A

If the wiper arm is moved to chassis ground, the output voltage increases. If the wiper arm 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 arm is in the middle position, the output voltage is +6V with respect to chassis ground. BCDE

TEST QUESTION 14

Slide3

A potentiometer voltage divider is used as an automotive fuel-level sensor, as shown

below. Which statement about the output voltage is correct?

A

If the wiper arm is moved to chassis ground, the output voltage increases. If the wiper arm 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 arm is in the middle position, the output voltage is +6V with respect to chassis ground. BCDE

TEST QUESTION 14

Slide4

TEST QUESTION 15

A B C

Point(s):

2

Cat. No.

1.2

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?

A

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.

B

C

D

E

A B C

Slide5

TEST QUESTION 15

A B C

Point(s):

2

Cat. No.

1.2

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?

A

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.

B

C

D

E

A B C

Slide6

The circuit below shows a basic panel illumination circuit schematic. Which of the following statements about the functionality of the panel illumination circuit, as shown below, are correct?

A  The fuse is for circuit protection in case of a short circuit B The brightness of the lamp is proportional to the amount of current through the lamp C The brightness of the lamp is proportional to the resistance value of the potentiometer D If the moving contact (wiper arm) of the potentiometer is disconnected from its resistive element, the amount of light on the instrument is at its maximum.E In the case of a cable break between switch and potentiometer, the fuse should be blown

Slide7

The circuit below shows a basic panel illumination circuit schematic. Which of the following statements about the functionality of the panel illumination circuit, as shown below, are correct?

A  The fuse is for circuit protection in case of a short circuit B The brightness of the lamp is proportional to the amount of current through the lamp C The brightness of the lamp is proportional to the resistance value of the potentiometer D If the moving contact (wiper arm) of the potentiometer is disconnected from its resistive element, the amount of light on the instrument is at its maximum.E In the case of a cable break between switch and potentiometer, the fuse should be blown

Slide8

A 3.3 kΩ resistor has burned out in a circuit. You must replace it with another resistor with the same resistance value. If the resistor carries 50 mA, what should be its power rating? Assume that you have available resistors in the following power ratings:   ¼ W, ½ W, 1 W, 2 W, 5 W, 10 W, and 20W.

A  10 WB 1 WC 5 WD ½ W E 2 W

Slide9

A 3.3 kΩ resistor has burned out in a circuit. You must replace it with another resistor with the same resistance value. If the resistor carries 50 mA, what should be its power rating? Assume that you have available resistors in the following power ratings:   ¼ W, ½ W, 1 W, 2 W, 5 W, 10 W, and 20W.

A  10 WB 1 WC 5 WD ½ W E 2 W

Slide10

You are measuring the current in a circuit that is operated by a 24 V DC power supply. The ammeter measures 48 mA. Later, you notice that the current has dropped to 40 mA. Eliminating the possibility of a resistance change, you conclude that the voltage has changed. How much has the voltage of the power supply changed?

A  40 VB 20VC 15VD 10VE 25V

Slide11

You are measuring the current in a circuit that is operated by a 24 V DC power supply. The ammeter measures 48 mA. Later, you notice that the current has dropped to 40 mA. Eliminating the possibility of a resistance change, you conclude that the voltage has changed. How much has the voltage of the power supply changed?

A  40 VB 20VC 15VD 10VE 25V

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