Question 1

A Wheatstone bridge is used to convert an AC voltage into a DC voltage.

Accepted Answer

A Wheatstone bridge is used to measure electrical resistance, not to convert AC voltage into DC voltage.

Question 2

All temperature sensors are classified as thermocouples.

Accepted Answer

True

Question 3

A variable capacitance pressure sensor determines pressure by a change in capacitance as the pressure being measured causes a change in the distance between the two plates of a capacitor.

Accepted Answer

A variable capacitance pressure sensor operates by detecting changes in capacitance caused by the movement of a diaphragm, which alters the distance between capacitor plates as pressure changes.

Question 4

Volatile memory would typically be lost (cleared) when the power supply is disconnected.

Accepted Answer

Volatile memory, such as RAM, requires power to maintain the stored information, so when the power is disconnected, the data is lost.

Question 5

Referring to the figure shown below, closing the switch in the circuit with the 1k ohm resistor with all the other switches open would result in 12V referenced to ground measured at the A/D input.

Accepted Answer

The answer of Referring to the figure shown below, closing...

Question 6

Referring to the following figure, this is an example of time-division multiplexing.

Accepted Answer

The answer of Referring to the following figure, this is...

Question 7

The 120 ohm characteristic impedance of J1939 cable can be measured with a DMM ohmmeter.

Accepted Answer

A DMM ohmmeter measures DC resistance, not characteristic impedance, which is a property of AC signals and requires specialized equipment like a network analyzer.

Question 8

Referring to the figure shown below, a shorted to ground circuit between the relay coil and the low side driver would cause the air fan clutch solenoid to be energized.

Accepted Answer

The answer of Referring to the figure shown below, a...

Question 9

Which of the following would most likely NOT be a temperature sensor?
A) Thermistor
B) RTD
C) Thermocouple
D) Hall effect sensor

Accepted Answer

A Hall effect sensor is primarily used to measure magnetic fields, not temperature.

Question 10

Technician A says that a damaged thermocouple wire should be repaired using a splice clip with solder and heat shrinkable tubing. Technician B says that most anti-lock brake systems use a strain gauge sensor to detect wheel speed. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Thermocouple wires should not be repaired with solder as it can affect the temperature reading; they should be replaced. Anti-lock brake systems typically use wheel speed sensors, not strain gauges, to detect wheel speed.

Question 11

A _____ would most likely be used to determine accelerator position.
A) potentiometer
B) rheostat
C) strain gauge
D) PRT

Accepted Answer

A potentiometer is commonly used to measure the position of an accelerator pedal by converting the pedal's position into an electrical signal.

Question 12

Technician A says that a variable reluctance sensor may be used to determine engine crankshaft position. Technician B says that a variable reluctance sensor may be used to determine engine crankshaft speed. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

A variable reluctance sensor can be used to determine both the position and speed of the engine crankshaft by detecting changes in magnetic fields as the crankshaft rotates.

Question 13

Referring to the following figure, closing all four switches at the same time would cause ____ at the A/D input referenced to ground.

A) more than 6V
B) 12V
C) less than 6V
D) more than 8V

Accepted Answer

The answer of Referring to the following figure, closing all...

Question 14

Technician A says that the amplitude of the output voltage of a variable reluctance sensor is dependent upon the sensor air gap. Technician B says that the output voltage of a variable reluctance sensor is dependent upon the rotational speed of the target. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

The amplitude of the output voltage of a variable reluctance sensor is affected by both the sensor air gap and the rotational speed of the target.

Question 15

Which of the following is a true statement?
A) The engine control module (ECM) is always in charge of a CAN network.
B) The parameter group number (PGN) indicates the type of module that is transmitting a J1939 message.
C) A J1939 SPN is similar to a J1587 PID.
D) All of the above are true statements.

Accepted Answer

A J1939 SPN (Suspect Parameter Number) is similar to a J1587 PID (Parameter Identifier) as both are used to identify specific data parameters within their respective communication protocols.

Question 16

An electronic module digital input that is internally-pulled down would most likely be connected to which of the following?
A) A variable reluctance sensor
B) A switch that when closed provides a positive voltage to the electronic module input terminal
C) A switch that when closed provides a ground for the electronic module input terminal
D) Battery positive terminal

Accepted Answer

An internally-pulled down digital input is typically connected to a switch that, when closed, provides a positive voltage, allowing the input to detect a high signal.

Question 17

Referring to the figure below, technician A says that if the resistance of the engine coolant temperature sensor is 1k ohms, the voltage at the A/D input terminal would be 2.5V reference to ground. Technician B says that if the fan override switch is closed, the voltage at the microprocessor Input A would be 12V. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

The answer of Referring to the figure below, technician A...

Question 18

Referring to the figure shown below, an open circuit between the engine coolant temperature sensor and the 1k ohm pull-up resistor would result in ___ at the A/D input referenced to ground. 
A) 0V
B) 2.5V
C) 5V
D) 12V

Accepted Answer

The answer of Referring to the figure shown below, an...

Question 19

An AND gate is most like which of the following?
A) Two resistors connected in parallel
B) Two switches connected in series
C) Two switches connected in parallel
D) Three switches connected in series-parallel

Accepted Answer

An AND gate is most like two switches connected in series because both require all inputs to be on for the output to be on.

Question 20

___ describes the relationship between the output of a sensor and the physical variable being measured such as pressure or temperature.
A) Multiplexing
B) Impedance
C) Floating impedance
D) Transfer function

Accepted Answer

The transfer function describes the relationship between the output of a sensor and the physical variable being measured, such as pressure or temperature.

Quiz 11: Sensors, Digital Electronics, and Multiplexing

A Wheatstone bridge is used to convert an AC voltage into a DC voltage.

All temperature sensors are classified as thermocouples.

A variable capacitance pressure sensor determines pressure by a change in capacitance as the pressure being measured causes a change in the distance between the two plates of a capacitor.

Volatile memory would typically be lost (cleared) when the power supply is disconnected.

Referring to the figure shown below, closing the switch in the circuit with the 1k ohm resistor with all the other switches open would result in 12V referenced to ground measured at the A/D input.

Referring to the following figure, this is an example of time-division multiplexing.

The 120 ohm characteristic impedance of J1939 cable can be measured with a DMM ohmmeter.

Referring to the figure shown below, a shorted to ground circuit between the relay coil and the low side driver would cause the air fan clutch solenoid to be energized.

Which of the following would most likely NOT be a temperature sensor?

Technician A says that a damaged thermocouple wire should be repaired using a splice clip with solder and heat shrinkable tubing. Technician B says that most anti-lock brake systems use a strain gauge sensor to detect wheel speed. Who is correct?

A _____ would most likely be used to determine accelerator position.

Technician A says that a variable reluctance sensor may be used to determine engine crankshaft position. Technician B says that a variable reluctance sensor may be used to determine engine crankshaft speed. Who is correct?

Referring to the following figure, closing all four switches at the same time would cause ____ at the A/D input referenced to ground.

Technician A says that the amplitude of the output voltage of a variable reluctance sensor is dependent upon the sensor air gap. Technician B says that the output voltage of a variable reluctance sensor is dependent upon the rotational speed of the target. Who is correct?

Which of the following is a true statement?

An electronic module digital input that is internally-pulled down would most likely be connected to which of the following?

Referring to the figure shown below, an open circuit between the engine coolant temperature sensor and the 1k ohm pull-up resistor would result in ___ at the A/D input referenced to ground.

An AND gate is most like which of the following?

___ describes the relationship between the output of a sensor and the physical variable being measured such as pressure or temperature.