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Use material from Unit
Three, and Chapter 15, Auto Fundamentals - Stockel,
Stockel and Johanson, to complete the following questions.
1. Technician A says that the primary purpose of engine
control computers is to control
emissions. Technician
B says that the primary purpose of engine control computers
is to improve performance.
Who is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
2. Which of the following types of computer memory stores data temporarily?
a. read only memory (ROM)
b. programmable read only memory (PROM)
c. random access memory (RAM)
d. all of the above
3. When does the ECU go into "open loop" mode?
a. when the engine is cold
b. when the engine is hot
c. when the engine is at wide open throttle
d. both A and C
4. Computer system trouble codes are stored in _____
a. ROM
b. PROM
c. RAM
d. all of the above
5. The simplest type of input sensor is the
a. on-off switch
b. pressure switch
c. magnetic pickup coil
d. reed switch
6. The ignition module can be an ________
a. output device
b. input sensor
c. knock sensor
d. both A and B
7. In a piezoelectric element, electricity is produced by
a. heat
b. light
c. chemical action
d. mechanical force
8. Technician A says that manifold vacuum is the negative
pressure in the intake
manifold when the engine
is running. Technician B says that manifold absolute
pressure changes correspond
to changes in manifold vacuum. Who is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
9. In a mass air flow (MAF) sensor, the wire is heated by
a. incoming air
b. electricity
c. engine heat
d. exhaust gases
10. The difference between the oxygen in the exhaust and the
outside air causes
_______ in the oxygen
sensor.
a. heat
b. pressure
c. a chemical reaction
d. a short circuit
11. The mixture control solenoid is used only on engines with ___
a. electronic ignition
b. carburetors
c. fuel injection
d. air cooling
12. A relay is used when an electrical component uses more
current than the
_______ can handle.
a. battery
b. sensors
c. ignition system
d. internal computer circuits
13. The ECU energizes the fuel pump relay when ____
a. the engine starts
b. more fuel is needed for acceleration
c. the key is turned to the on position
d. the mechanical fuel pump stops operating
14. On a late model vehicle, the transmission control solenoids
are used to control
the automatic transmission
____
a. fluid temperature
b. shift points
c. noise
d. pump output
15. The gate circuit that requires two or more switches in
series to be closed to complete
the circuit to turn a
lamp on is a(n) _______ circuit.
a. AND
b. OR
c. NAND
d. NOR
16. When a incoming signal to the ECU must be amplified and/or
changed from analog
to digital, this is known
as __________
a. linear amplification
b. reference voltage setting
c. input conditioning
d. output driving
17. The reference voltage from most ECU's is ________ volts.
a. 1
b. 5
c. 9
d. 12
18. Which of the following inputs requires a reference voltage?
a. throttle position sensor
b. heated oxygen sensor
c. distributor pickup coil
d. crankshaft position sensor
19. The gate circuit that uses two or more switches in parallel
that can be used
to turn a light on is
a(n) ______ circuit.
a. AND
b. OR
c. NAND
d. NOR
20. Engine control computers can be used to control
a. spark timing
b. fuel
c. emissions
d. all of the above
21. Transistors that are switched by the computer to control
various circuits are
called __________
a. relays
b. output drivers
c. solenoids
d. input conditioners
22. Engine control computers are also known as an______
a. electronic engine controller
b. electronic control module
c. powertrain control module
d. all of the above
23. The gate circuit that uses two or more switches in series
to turn a light off
is called a(n)
____________ circuit.
a. AND
b. OR
c. NAND
d. NOR
24. Distributors use a ____________ pickup to send camshaft
position and speed
information to the computer.
a. magnetic
b. Hall Effect
c. optical
d. all of the above
25. The gate circuit that uses two or more switches in parallel
so that any one can
be used to turn a light
off is called a(n) _________ circuit.
a. AND
b. NAND
c. OR
d. NOR
KEY - UNIT THREE