Description
Computerized Engine Controls 10th Edition by Steve V. Hatch – Test Bank
Sample Questions
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| Chapter 02
1. What decimal (base 10) value is represented by the binary code “10110011”?
| |
a. |
14 |
b. |
115 |
| |
c. |
179 |
d. |
243 |
|
2. What does a “baud rate” of 41,600 mean?
| |
a. |
41,600 bits are communicated per second |
b. |
41,600 bits are communicated per minute |
| |
c. |
41,600 bytes are communicated per second |
d. |
41,600 bytes are communicated per minute |
|
3. A scan tool is displaying the hexadecimal value for the binary code “1010000100111110”. Which hex value is displayed on the scan tool?
| |
a. |
$A13E |
b. |
$1010 |
| |
c. |
$B2CF |
d. |
$A690 |
|
4. Which component is a memory type that allows the microprocessor to change the information that is stored in it?
| |
a. |
ROM |
b. |
PROM |
| |
c. |
RAM |
d. |
CPU |
|
| 5. Which component in an engine computer is a volatile memory and stores sensor input values until updated, strategy results, fuel trim data, and memory type fault codes?
| |
a. |
ROM |
b. |
PROM |
| |
c. |
RAM |
d. |
CPU |
|
6. Which of the following defines a computer input?
| |
a. |
Voltage & ground supplied to power up the computer |
b. |
A signal from a sensor that measures various conditions |
| |
c. |
Stored information in memory that the computer uses in making decisions |
d. |
A command signal to a relay, a motor, or a solenoid |
|
7. Technician A says that a PCM uses an output actuator to keep itself informed of engine operating conditions. Technician B says that a PCM uses an output actuator to cause a change in the performance of a circuit or system. Who is correct?
| |
a. |
Technician A only |
b. |
Technician B only |
| |
c. |
Both A and B |
d. |
Neither A nor B |
|
| 8.
Concerning the logic gate pictured in Figure 3 above, which condition would produce binary “one” for “C” (the output)?
| |
a. |
“A” is a “zero” and “B” is a “one” |
b. |
“A” is a “one” and “B” is a “zero” |
| |
c. |
“A” and “B” are both “ones” |
d. |
All of the above |
|
| 9. A vehicle’s engine computer does not operate properly. The vehicle’s battery is checked with a DVOM and has an open circuit voltage of 8.3 volts.
Technician A says that the PCM is probably defective and should be replaced. Technician B says that, before condemning the PCM, the battery should be charged and retested. Then the appropriate voltage drop tests of the PCM’s power and ground circuits should be performed. Who is correct?
| |
a. |
Technician A only |
b. |
Technician B only |
| |
c. |
Both technicians |
d. |
Neither technician |
|
10. Which of the following is NOT required in order for an engine computer to enter closed loop operation?
| |
a. |
The oxygen sensor must be up to operating temperature. |
b. |
The engine’s coolant temperature must be at or above a specified temperature. |
| |
c. |
The vehicle must be at or above a designated speed as measured by the vehicle speed sensor. |
d. |
A specified time period must have passed since the engine was started. |
|
11. In addition to providing voltage to the computer’s internal circuits, what is the purpose of the reference voltage regulator within a modern PCM?
| |
a. |
To provide 5 volts to the sensors on the input side of the PCM |
b. |
To provide 5 volts to the actuators on the output side of the PCM |
| |
c. |
To provide 12 volts to the sensors on the input side of the PCM |
d. |
To provide 12 volts to the actuators on the output side of the PCM |
|
12. “Closed loop” is defined as a system operating mode:
| |
a. |
in which the computer becomes part of a communications loop with other computers |
b. |
in which the computer ignores the input from the oxygen sensor |
| |
c. |
in which the computer monitors the results of its own control |
d. |
that the computer enters only when the throttle is closed |
|
13. Which gas is naturally produced within the engine’s cylinders through combining the hydrogen atom of the HC molecule with atmospheric oxygen?
| |
a. |
CO |
b. |
CO2 |
| |
c. |
NOX |
d. |
H2O |
|
14. Technician A says that closed loop is the most efficient operating mode and allows the engine computer to control the air-fuel ratio with the most precision. Technician B says that open loop operation is used to improve performance during cold engine warm-up and is also used under heavy load or during wide open throttle operation. Who is correct?
| |
a. |
Technician A only |
b. |
Technician B only |
| |
c. |
Both technicians |
d. |
Neither technician |
|
15. What is indicated if the oxygen sensor voltage is cycling back and forth across the stoichiometric value several times per second?
| |
a. |
The air-fuel ratio is too lean and the voltage cannot stabilize |
b. |
The air-fuel ratio is too rich and the voltage cannot stabilize |
| |
c. |
The computer is properly controlling the air-fuel ratio |
d. |
The computer is malfunctioning |
|
16. Which operating condition(s) has/have the programmed goal of _____ maintaining a stoichiometric air-fuel ratio?
| |
a. |
open loop operation only |
b. |
closed loop operation only |
| |
c. |
both closed loop and open loop operation |
d. |
limp-in mode only |
|
17. What is the advantage of controlling the air-fuel ratio to a stoichiometric ratio?
| |
a. |
A stoichiometric ratio reduces the production of toxic emissions within the engine’s cylinders |
b. |
A stoichiometric ratio helps the three-way catalytic converter perform at its peak efficiency |
| |
c. |
A stoichiometric ratio increases the potential for performance when the engine is under heavy load |
d. |
Both A and B |
|
18. Which air-fuel ratio would provide the most power?
| |
a. |
14.4:1 |
b. |
12.5:1 |
| |
c. |
14.7:1 |
d. |
16:1 |
|
19. Which designation is NOT one of the three basic logic gates from which all of the more complex gates are built?
| |
a. |
AND gate |
b. |
OR gate |
| |
c. |
NOR gate |
d. |
NOT gate |
|
20. Exhaust gasses are being discussed. Technician A says nitrogen (N) is considered a harmful gas. Technician B says carbon monoxide (CO) is considered a harmful gas. Who is correct?
| |
a. |
Technician A only |
b. |
Technician B only |
| |
c. |
Both A and B |
d. |
Neither A nor B |
|
| Chapter 04
1. Reid Vapor Pressure (RVP) is a unit of measurement used to measure a fuel’s:
| |
a. |
Alcohol content |
b. |
Ability to atomize |
| |
c. |
Octane |
d. |
Volatility |
|
2. In order to ease cold weather starting, gasoline refiners produce gasoline in the winter months that has a:
| |
a. |
Lower volatility |
b. |
Higher volatility |
| |
c. |
Lower octane |
d. |
Higher octane |
|
3. All of the following are used to combat the potential for vapor lock to occur EXCEPT:
| |
a. |
The addition of a fuel return line |
b. |
The deletion of the fuel return line |
| |
c. |
The relocation of the fuel pump back to within the fuel tank |
d. |
The use of higher pressures within the fuel management system |
|
4. Technician A says that on fuel injection systems, the fuel pump relay carries the high amperage current for the fuel pump. Technician B says that on fuel injection systems with a return line, the fuel pressure regulator is located after the fuel pump and before the fuel injectors. Who is correct?
| |
a. |
Technician A only |
b. |
Technician B only |
| |
c. |
Both technicians |
d. |
Neither technician |
|
5. Technician A says that if a fuel supply line ruptures during an accident resulting in fuel pressure loss and engine stall, the PCM will shut down the fuel pump. Technician B says that the fuel pump is controlled by the ignition switch only and should always run whenever the ignition switch is in the “run” position. Who is correct?
| |
a. |
Technician A only |
b. |
Technician B only |
| |
c. |
Both technicians |
d. |
Neither technician |
|
6. With the engine running, how is the PCM programmed to pulse the fuel injectors in a sequential fuel injection (SFI/SMPI) system?
| |
a. |
Pulse all injectors simultaneously once each crankshaft revolution |
b. |
Pulse one half of the injectors simultaneously on each crankshaft revolution |
| |
c. |
Pulse the injectors in pairs |
d. |
Pulse the injectors individually in the engine’s firing order |
|
7. In a GDI system the fuel injectors spray fuel directly into the combustion chamber and require higher fuel pressures under heavy load, typically as high as:
| |
a. |
150 PSI |
b. |
625 PSI |
| |
c. |
2,140 PSI |
d. |
10,500 PSI |
|
8. In an electronic return-less SMPI system, the PCM controls all of the following EXCEPT:
| |
a. |
Intake manifold pressure |
b. |
Fuel pump speed |
| |
c. |
Fuel rail pressure |
d. |
Fuel pressure differential across the fuel injectors |
|
9. With modern terminology, the acronym “DI” refers to which type of ignition system?
| |
a. |
A distributor ignition system using only one ignition coil |
b. |
A “Waste Spark” distributorless ignition system using one ignition coil for each pair of cylinders |
| |
c. |
A “Coil-On-Plug” distributorless ignition system using one ignition coil for each cylinder |
d. |
Both B and C |
|
10. What level of tach reference information is required in order for the PCM to properly control a distributor ignition system?
| |
a. |
Level one information indicating that “a pair” of cylinders’ pistons are approaching TDC |
b. |
Level two information indicating “which pair” of cylinders’ pistons are approaching TDC |
| |
c. |
Level three information indicating which cylinder of the piston pair approaching TDC is on the compression stroke |
d. |
None of this information is required in order for the PCM to control a distributor ignition system |
|
11. What level of tach reference information is required in order for the PCM to properly control a “Waste Spark” ignition system?
| |
a. |
Level one information indicating that “a pair of cylinders`pistons is approaching TDC” |
b. |
Level two information indicating “which pair of cylinders`pistons is approaching TDC” |
| |
c. |
Level three information indicating “which cylinder of the piston pair approaching TDC is on the compression stroke” |
d. |
None of this information is required in order for the PCM to control a “Waste Spark” system |
|
12. What level of tach reference information is required for the PCM to properly control a COP ignition system?
| |
a. |
Level one information indicating that “a pair of cylinders`pistons is approaching TDC” |
b. |
Level two information indicating “which pair of cylinders`pistons is approaching TDC” |
| |
c. |
Level three information indicating “which cylinder of the piston pair approaching TDC is on the compression stroke” |
d. |
None of this information is required for the PCM to control a COP ignition system |
|
13. What level of tach reference information is required in order for the PCM to properly control an SFI fuel management system?
| |
a. |
Level one information indicating that “a pair of cylinders`pistons is approaching TDC” |
b. |
Level two information indicating “which pair of cylinders`pistons is approaching TDC” |
| |
c. |
Level three information indicating “which cylinder of the piston pair approaching TDC is on the compression stroke” |
d. |
None of this information is required in order for the PCM to control a SFI fuel management system. |
|
14. During closed-loop operation of a fuel injection system, the PCM is programmed to perform all of the following functions EXCEPT:
| |
a. |
controlling how much fuel is introduced into the intake manifold |
b. |
fine-tuning the air-fuel ratio to minimize toxic emissions while maximizing fuel economy |
| |
c. |
retaining good driveability under cruise and light-to-moderate acceleration |
d. |
maximizing driveability during cold starts and hard accelerations |
|
| 15.
When battery voltage drops below a specified value, the PCM:
| |
a. |
increases ignition dwell to compensate for a weakened ignition spark |
b. |
enters open-loop operation |
| |
c. |
enriches the air-fuel mixture |
d. |
Both A and C |
|
16. Technician A says one advantage of a variable valve timing system is that it allows a higher-compression engine to burn a lower octane fuel while still being able to control the potential for detonation. Technician B says that most VVT systems use engine oil pressure to control them hydraulically. Who is correct?
| |
a. |
Technician A only |
b. |
Technician B only |
| |
c. |
Both technicians |
d. |
Neither technician |
|
17. What is the primary purpose for replacing 14-volt systems with 42-volt systems?
| |
a. |
To eliminate the charging system |
b. |
To make the vehicle’s electrical systems safer to work on |
| |
c. |
To increase the KV that the ignition coil(s) can provide |
d. |
To provide more total wattage than a 14-volt system can provide |
|
18. Technician A says in a return-less fuel system, the regulator is located in the fuel tank. Technician B says in a return-type system, the regulator is located on the fuel inlet line. Who is correct?
| |
a. |
Technician A only |
b. |
Technician B only |
| |
c. |
Both A and B |
d. |
Neither A nor B |
|
19. The emission control system that is designed to recirculate blow by gasses from the crankcase to the intake manifold is known as:
| |
a. |
PCV |
b. |
EGR |
| |
c. |
EVAP |
d. |
AIR |
|
20. The emission system that is designed to route ambient air into the exhaust manifold during cold engine warm up only is known as:
| |
a. |
EGR |
b. |
AIR |
| |
c. |
EVAP |
d. |
PCV |
|
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