Question 1

A high voltage on the pressure sensor signal wire would most likely be caused by which of the following?&#10;A)An open in the supply circuit.&#10;B) An open in the signal circuit .&#10;C)A short to ground in the supply circuit .&#10;D) A short to ground in the signal circuit. .

Accepted Answer

An open in the signal circuit can cause a high voltage reading because the circuit is incomplete, leading to a lack of proper voltage drop across the sensor, resulting in a higher voltage reading at the signal wire.

Question 2

The Wheatstone bridge is:&#10;A)A pressure sensing device that uses a variable capacitor.&#10;B)A pressure sensing device that uses varying resistances in a series-parallel circuit design.&#10;C)Used to measure motion by use of magnetic inductance.&#10;D)None of these choices.

Accepted Answer

The Wheatstone bridge is a circuit design that uses four resistors, arranged in a series-parallel configuration, to measure an unknown resistance. It is commonly used in pressure sensing devices and strain gauges. It is not related to capacitors or magnetic inductance.

Question 3

A low voltage on the pressure sensor's supply circuit could be caused by any of the following EXCEPT :&#10;A)An open in the supply circuit wire.&#10;B) A short to ground in the supply circuit wire.&#10;C)High internal resistance in the sensor.&#10;D) Excessive voltage drop in the supply circuit.

Accepted Answer

High internal resistance in the sensor would not cause a low voltage on the pressure sensor's supply circuit. The other options (an open circuit, a short to ground, or excessive voltage drop) would all cause a low voltage on the supply circuit.

Question 4

What is the Whetstone Bridge used to measure?&#10;A)Pressure&#10;B) Motion&#10;C)Temperature&#10;D) All of these choices

Accepted Answer

The Whetstone Bridge is primarily used to measure pressure. Although it can be adapted to measure other variables such as strain or temperature, it is most commonly used for measuring pressure. Therefore, option A is the best choice.

Question 5

The scan tool displays 5 volts for the ambient temperature sensor. This indicates:&#10;A) An open in the reference voltage circuit.&#10;B) An open in the voltage sensing circuit&#10;C)An open in the sensor.&#10;D) All of these choices.

Accepted Answer

The answer of The scan tool displays 5 volts for...

Question 6

When inspecting magnetoresistive sensors, all of the following must be checked EXCEPT:&#10;A)Bias voltage&#10;B) Proper contact between the sensor and the tone wheel&#10;C)Proper mounting of the sensor&#10;D) Tone wheel teeth condition

Accepted Answer

The answer of When inspecting magnetoresistive sensors, all of the...

Question 7

All of the following can be used to measure movement or position, EXCEPT:&#10;A)Potentiometer&#10;B)Magnetic pulse generator&#10;C)Piezoelectric device&#10;D)Hall-effect sensor

Accepted Answer

Three out of the four choices listed (A, B, and D) are commonly used to measure movement or position, while piezoelectric devices are typically used to measure force or pressure.

Question 8

When inspecting Magnetoresistive sensors, all of the following must be checked except:&#10;A)AC output signal&#10;B) Proper air gap between the sensor and the tone wheel&#10;C)Proper mounting of the sensor&#10;D) Tone wheel teeth condition

Accepted Answer

AC output signal is not relevant when inspecting magnetoresistive sensors. The other options are important factors to check for proper functioning of the sensor.

Question 9

Which of the following would NOT be considered a computer input?&#10;A)Throttle position sensor&#10;B)Magnetic pulse generator&#10;C)Park/Neutral switch&#10;D)EGR vent solenoid

Accepted Answer

The EGR vent solenoid is an output device that controls the emission system, not an input device that sends data to the computer. The other options listed are input devices that provide information to the computer.

Question 10

Which of the following is an example of a piezoelectric sensor?&#10;A)Fuel gauge sender unit&#10;B)Knock sensor&#10;C)Coolant temperature sender unit&#10;D)Hall-effect sensor

Accepted Answer

A piezoelectric sensor generates an electrical signal when subjected to mechanical stress or pressure. The knock sensor is one such example as it converts the vibrations caused by engine knocking into electrical signals which are then used by the engine control module to adjust engine timing and prevent damage. The fuel gauge sender unit and coolant temperature sender unit are examples of resistive sensors that change their resistance in response to changes in the fuel level or coolant temperature respectively. The Hall-effect sensor is a magnetic sensor that uses the Hall effect to measure magnetic fields.

Question 11

The piezoelectric sensor operates by:&#10;A)Altering the resistance values of the bridge circuit located on a ceramic disc.&#10;B) Dropping voltage over a fixed resistor as pressure is applied to the switching transistor.&#10;C)Generating a voltage within a thin ceramic disc voltage generator that is attached to a diaphragm that stresses the crystals in the disc.&#10;D)None of these choices.

Accepted Answer

The answer of The piezoelectric sensor operates by:&#10;A)Altering the resistance...

Deck 10: Computer Input Sensor Diagnostic Routines