Question 1

The Wheatstone bridge is:

Accepted Answer

A) A pressure sensing device that uses a variable capacitor. 
B) A pressure sensing device that uses varying resistances in a series-parallel circuit design. 
C) Used to measure motion by use of magnetic inductance. 
D) None of these choices. B

Question 2

Which of the following would NOT be considered a computer input?

Accepted Answer

A) Throttle position sensor 
B) Magnetic pulse generator 
C) Park/Neutral switch 
D) EGR vent solenoid D

Question 3

Which of the following is an example of a piezoelectric sensor?

Accepted Answer

A) Fuel gauge sender unit 
B) Knock sensor 
C) Coolant temperature sender unit 
D) Hall-effect sensor B

Question 4

When inspecting magnetoresistive sensors, all of the following must be checked EXCEPT:

Accepted Answer

A) Bias voltage 
B)  Proper contact between the sensor and the tone wheel 
C) Proper mounting of the sensor 
D)  Tone wheel teeth condition

Question 5

A low voltage on the pressure sensor's supply circuit could be caused by any of the following EXCEPT :

Accepted Answer

A) An open in the supply circuit wire. 
B)  A short to ground in the supply circuit wire. 
C) High internal resistance in the sensor. 
D)  Excessive voltage drop in the supply circuit.

Question 6

When inspecting Magnetoresistive sensors, all of the following must be checked except:

Accepted Answer

A) AC output signal 
B)  Proper air gap between the sensor and the tone wheel 
C) Proper mounting of the sensor 
D)  Tone wheel teeth condition

Question 7

What is the Whetstone Bridge used to measure?

Accepted Answer

A) Pressure 
B)  Motion 
C) Temperature 
D)  All of these choices

Question 8

The scan tool displays 5 volts for the ambient temperature sensor. This indicates:

Accepted Answer

A)  An open in the reference voltage circuit. 
B)  An open in the voltage sensing circuit 
C) An open in the sensor. 
D)  All of these choices.

Question 9

The piezoelectric sensor operates by:

Accepted Answer

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

Question 10

All of the following can be used to measure movement or position, EXCEPT:

Accepted Answer

A) Potentiometer 
B) Magnetic pulse generator 
C) Piezoelectric device 
D) Hall-effect sensor

Question 11

A high voltage on the pressure sensor signal wire would most likely be caused by which of the following?

Accepted Answer

A) An open in the supply circuit. 
B)  An open in the signal circuit . 
C) A short to ground in the supply circuit . 
D)  A short to ground in the signal circuit. .

Exam 10: Computer Input Sensor Diagnostic Routines