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1. Which of the following is NOT a solid state component?
a.
Transistor
b.
Diode
c.
Solenoid
d.
Zener diode
2. Which of the following materials is defined as a semiconductor?
a.
Gold
b.
Silicon
c.
Aluminum
d.
Plastic
b
3. What has to be done to a semiconductor material before it can be used in a solid state device?
a.
Purified
b.
Doped
c.
Decomposed
d.
Activated
b
4. Which type of diode produces an electrical response when subjected to light?
a.
Zener diode
b.
LED
c.
Clamping diode
d.
Photodiode
d
5. What type of transistor can be used in an ECU to switch actuators?
a.
power transistor
b.
field effect transistors
c.
silicon controlled rectifiers
d.
MOSFET
6. Which Digital Multimeter (DMM) test mode would be used to bench-test transistors?
a.
Volts DC
b.
Volts AC
c.
Ohms
d.
Milliamps
7. What would be required of a two-switch AND gate to produce an output?
a.
Both switches OFF
b.
Both switches ON
c.
Either switch ON
d.
Neither switch ON
b
8. Which of the following electrical devices is often used to measure temperature?
a.
Rheostat
b.
Potentiometer
c.
Pulse generator
d.
Thermistor
d
9. Which type of thermistor would most likely be used as an input to a truck’s computer circuit?
a.
NTC
b.
PTC
c.
AMP
d.
CRT
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10. Which of the following numbers would be equivalent to the binary coded number 0000 1000?
a.
4
b.
8
c.
256
d.
1000
b
11. What is the common value used as reference voltage (V-Ref) in truck chassis electronics?
a.
1 V
b.
5 V
c.
12.6 V
d.
13.8-14.2 V
b
12. Which of the following input sensors could be used to signal pressure values?
a.
Piezo-resistive
b.
Pulse generator
c.
Thermistor
d.
Potentiometer
13. Which of the following best explains how Doppler-effect is used to determine relative velocity?
a.
Analysis of radiated light waves
b.
Frequency shift analysis
c.
Bouncing sonar signals
d.
Measuring amplitude deterioration
b
14. What is the term we use in truck electronics to describe what happens when two or more chassis computers are
connected “talk” to each other?
a.
Chat
b.
Internet
c.
Multiplexing
d.
Handshake
15. A fixed frequency signal in which the percentage of ON time can be varied is known as:
a.
sine wave
b.
pulse width modulation
c.
frequency modulation
d.
3-Phase AC
b
16. What is hertz used to measure?
a.
duty cycle
b.
frequency
c.
PWM
d.
pulse width
17. Which of the following best describes how a diode functions in an electrical circuit?
a.
current amplifier
b.
voltage amplifier
c.
relay switch
d.
one-way switch
d
18. When a diode allows current to flow through it, what state is it in?
a.
forward bias
b.
reverse bias
c.
neutral bias
d.
none of the above
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19. Which of the following components would likely use a Zener diode in a truck electrical circuit?
a.
rectifier
b.
voltage regulator
c.
electric wiper motor
d.
spike suppressor
b
20. Which type of diode can be used in a digital display window?
a.
light emitting diode
b.
zener diode
c.
small signal diode
d.
photo diode
21. Which terminal of a transistor can be regarded as the “switch”?
a.
emitter
b.
collector
c.
base
d.
anode
22. Which terminal of a transistor is the output terminal?
a.
emitter
b.
collector
c.
base
d.
anode
23. How many terminals are there on a diode?
a.
one
b.
two
c.
three
d.
four
b
24. Which of the following solid state devices can be used to function in much the same way that a relay does?
a.
diode
b.
transistor
c.
thermistor
d.
LED
b
25. What is the amplification capacity of a typical transistor?
a.
10 times
b.
100 times
c.
10,000 times
d.
2 times
26. Approximately how much voltage is required to forward bias a bipolar transistor?
a.
.6 volts
b.
2.4 volts
c.
4.8 volts
d.
12 volts
27. Which of the following is a collision mitigation system (CMS) designed to perform?
a.
detect objects in front of and at the sides of a truck
b.
evaluate potential danger from other vehicles
c.
actuate brakes
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d.
all of the above
d
28. Which of the following computer memory categories is volatile?
a.
RAM
b.
ROM
c.
PROM
d.
EEPROM
29. Which of the following is the most recent truck data bus system?
a.
SAE J1587
b.
SAE J1708
c.
SAE J1939
d.
SAE J-2010
30. How many bits are there in one byte?
a.
2
b.
8
c.
256
d.
512
b
31. How many different states can be expressed by one byte of data?
a.
2
b.
8
c.
256
d.
512
32. A NTC type thermister is supplied with V-Ref. What will happen to signal voltage when temperature goes up?
a.
no change
b.
increases
c.
decreases
d.
none of the above
b
33. With which part of a computer processing cycle are sensors associated with?
a.
input
b.
processing
c.
output
d.
actuator
34. What electrical operating principle is used by a ‘non–contact’ throttle position sensors?
a.
thermister
b.
potentiometer
c.
variable capacitance
d.
Hall-effect
d
35. How many terminals are required by a potentiometer such as that used as a ‘contact’ throttle position sensor?
a.
one only
b.
two
c.
three
d.
four
36. What type of sensor can be used to signal pressure values in truck electronic systems?
a.
thermister
b.
potentiometer
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c.
variable capacitance
d.
inductive pulse generator
37. Which of the following types of input circuit sensor does not require V-Ref?
a.
variable capacitance
b.
inductive pulse generator
c.
thermister
d.
potentiometer
38. Which of the following sensors could use an inductive pulse generator principle?
a.
wheel speed sensor
b.
tailshaft speed sensor
c.
engine speed sensor
d.
all of the above
d
39. What is used to convert the results of ECU processing into action?
a.
actuators
b.
hydraulic circuits
c.
valve cams
d.
diodes
40. What is used in a truck system ECM or ECU to switch output circuit devices?
a.
transistors
b.
sensors
c.
relays
d.
transformers
41. What hardware component within a vehicle ECU performs arithmetic and logic processing?
a.
RAM
b.
ROM
c.
PROM
d.
CPU
d
42. Technician A says that most vehicle microprocessors run on voltages higher than the usual 12-volt chassis voltage
system. Technician B says that the rated processing frequency of a CPU is known as its clock speed. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
b
43. Technician A says that when an ECU is exposed to voltage spikes its circuitry can be damaged. Technician B says that
because of the sensitivity of chassis electronic systems, great care should be exercised when connecting break-out box and
diagnostic Tee-connectors into a circuit. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
44. Which of the following types of data is retained electronically in a vehicle computer system?
a.
RAM
b.
ROM
c.
PROM
d.
EEPROM
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45. Technician A says that an NTC thermister type temperature sensor produces non-linear readings, so intermediate
resistance values cannot be used to calculate a specific temperature value. Technician B says that resistance values on a
typical NTC type thermister range between 50 kilo-ohms and 100 kilo-ohms. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
46. Which of the following types of sensor would be associated with a Wheatstone bridge circuit?
a.
variable capacitance
b.
Piezo resistive
c.
Piezo-electric
d.
thermister
b
47. What component in a computer controlled chassis system manages V-Ref (reference voltage)?
a.
battery
b.
alternator voltage regulator
c.
voltage sensor
d.
ECU
d
48. Where in a chassis electronic system is the master program for system management usually located?
a.
RAM
b.
ROM
c.
PROM
d.
EEPROM
b
49. When PROM and EEPROM data retention are combined in a card or set of chips, what is this called by some OEMs?
a.
personality module
b.
ROM
c.
NV–RAM
d.
cache
50. Where is the radar antenna located in a Wingman collision mitigation system (CMS)?
a.
behind mirrors
b.
under the dash
c.
on the steering wheel
d.
center of front bumper
d