SNS COLLEGE OF TECHNOLOGY (An Autonomous Institution) Coimbatore-35 DEPARTMENT OF AUTOMOBILE ENGINEERING 16AU206-ELECTRONIC ENGINE MANAGEMENT SYSTEMS TWO MARK QUESTIONS & ANSWERS

UNIT 1 ELECTRONICS

1. Define Semiconductors? Semiconductor devices are basic building blocks for electronic circuits. Semiconductors devices are commonly called solid state devices because they are made from solid material.

2. What is Diode? Diode is a two terminal electrical device having one electrode that is called anode (P-type semiconductor) and another that is called the cathode (N-type semiconductor).

3. Define Transistors? Transistors are active elements because they can amplify or transform a signal level. Transistors are three terminal circuit elements that act like current valves. Types: NPN Transistor & PNP transistor.

4. Define Amplifier? Amplifier is an electronic device that can increase the power of a signal. Types: Power amplifier, Vacuum type amplifier, Transistor amplifier & Magnetic amplifier.

5. Define Integrated Circuits? Integrated circuits more often called on IC, microchip, silicon chip , computer chip is a piece of specially prepared silicon or another semiconductor into which a very complex electronic circuit is etched using photographic techniques.

6. Define logic Gates? Logic gate is an elementary building block of digital circuit. Logic gate has two input and one output.

7. Write the types of logic gates?    AND gate    OR gate    XOR gate    NOT gate    NAND gate   NOR gate

SNS COLLEGE OF TECHNOLOGY (An Autonomous Institution) Coimbatore-35 DEPARTMENT OF AUTOMOBILE ENGINEERING 16AU206-ELECTRONIC ENGINE MANAGEMENT SYSTEMS TWO MARK QUESTIONS & ANSWERS

8. Define Microcontroller? Microcontroller is a small computer on a single integrated circuit containing a processor core, memory and programmable input/output peripherals.

9. Define Analog to digital convertor? An electronic circuit which transforms a signal from analog to digital form. Analog signals are directly measurable. Digital signals only have two states.

10. Define Digital to analog convertor? A digital to analog convertor converts a digital input to an analog voltage or current output.

11. Write the application of DAC?    Digital motor control    Computer printouts    Digital   Electronic circuit control.

SNS COLLEGE OF TECHNOLOGY (An Autonomous Institution) Coimbatore-35 DEPARTMENT OF AUTOMOBILE ENGINEERING 16AU206-ELECTRONIC ENGINE MANAGEMENT SYSTEMS TWO MARK QUESTIONS & ANSWERS

UNIT 2 SENSORS

1. Define air flow sensors? AFS converts the amount of air drawn into the engine into voltage signal. AFS is located directly in the intake air stream between air cleaner and .

2. Mention the types of air flow sensors?    Mass air flow sensor   Vane air flow sensor 

3. Define Pressure sensor? Pressure sensor is used to measure intake manifold pressure, atmospheric pressure, vapour pressure in etc.

4. Write the types of pressure sensor?    Manifold absolute pressure sensor    Barometric pressure sensor    Vapour pressure sensor   sensor. 

5. Define Temperature sensors? Device used to measure air and liquid temperatures between -40°C and +130°C for proper amount of .

6. Mention the types of temperature sensors?    Engine coolant temperature    Intake air temperature   Exhaust recirculation gas temperature sensor. 

7. Define intake air temperature sensor? Detects the temperature of incoming air stream on a cold starts, heat up the incoming on MAF sensor equipped vehicles.

8. Define EGR sensor? EGR sensor is located in the EGR passage and measures the temperature of the exhaust gases.

SNS COLLEGE OF TECHNOLOGY (An Autonomous Institution) Coimbatore-35 DEPARTMENT OF AUTOMOBILE ENGINEERING 16AU206-ELECTRONIC ENGINE MANAGEMENT SYSTEMS TWO MARK QUESTIONS & ANSWERS

UNIT 3 GASOLINE INJECTION SYSTEM 1. Define Catalytic Convertor? Catalytic convertor is an electronic device that converts the harmful gases from automobiles exhaust into harmless gas. Located in exhaust pipe mainly used catalyst are platinum, palladium & rhodium.

2. Define MPFI? Multi Pint Fuel Injection is a system that combines the injection along with spark timing. A multipoint fuel injection is a system used in multi Petrol engines.

3. Write the components of MPFI?    Common rail    ECU    Injectors    Fuel tank         Sensors 

4. Mention the Advantages of MPFI?    High Performance    Low fuel consumption   Quicker warm up start 

5. Define Direct Injection System? Fuel injected directly into the . This allows engine to operate in two modes.    Homogeneous mode   Stratified mode.  6. Write the advantages of Direct Injection system?    Improved volumetric Efficiency    Increased    Less fuel consumption & high power    Reduced emissions   Resistance to pre ignition.

SNS COLLEGE OF TECHNOLOGY (An Autonomous Institution) Coimbatore-35 DEPARTMENT OF AUTOMOBILE ENGINEERING 16AU206-ELECTRONIC ENGINE MANAGEMENT SYSTEMS TWO MARK QUESTIONS & ANSWERS

7. Write the basic requirements of gasoline injection system?   To supply the engine with optimal air fuel mixture for any given operating conditions.   Meet emission norms.   Maintaining air fuel mixture within precisely defined limits, which translates into  superior performance.  

8. Mention the classification of gasoline injection system?

Injection system

External A/F mixture formation Internal A/F mixture formation

Direct Injection SPI MPFI

9. Define Idle Speed? Idle is the rotational speed of the engine runs on when the engine is uncoupled to the drive train and the throttle pedal isn’t depressed of a combustion engine. At idle speed engine generates enough power to run reasonably smoothly and operates water pump, .

10. Define Knock? Knock in spark ignition internal combustion engine occurs when combustion of air fuel mixture in the cylinder does not start off correctly in response to ignition by the , but one or more pockets of air/fuel mixture explode outside the envelope of normal combustion front.

SNS COLLEGE OF TECHNOLOGY (An Autonomous Institution) Coimbatore-35 DEPARTMENT OF AUTOMOBILE ENGINEERING 16AU206-ELECTRONIC ENGINE MANAGEMENT SYSTEMS TWO MARK QUESTIONS & ANSWERS

UNIT 4 DIESEL INJECTION SYSTEM

1. Define CRDI? CRDI means common rail injection system. It is a device used to inject the diesel to injector equally to all cylinders at same pressure.

2. Write the components of CRDI system?    High Pressure Fuel Feed Pump    Common Rail    Pressure Regulator    Electronic Injector    ECM   Group of Sensors 

3. What is the purpose of Electronic Diesel control? It is a fuel injection control system for the precise metering and delivery of fuel into the combustion chamber of modern diesel engines used in .

4. Define Unit Injector system? It is an integrated direct fuel injection system for diesel engines, combining the injector nozzle and injection pump in a single component.

5. Write the sequences of operation in unit injector system?    Full Phase    Spill Phase    Injection Phase    Pressure Reduction Phase 6. Write the advantages of CRDI?    Fuel quantity is controlled    Better control of start of injection    Idle speed, control is better   Cruise control can be accomplished

SNS COLLEGE OF TECHNOLOGY (An Autonomous Institution) Coimbatore-35 DEPARTMENT OF AUTOMOBILE ENGINEERING 16AU206-ELECTRONIC ENGINE MANAGEMENT SYSTEMS TWO MARK QUESTIONS & ANSWERS

7. Write the components of electronic diesel control of pumps?    Sensors    Fuel Pressure Sensor    Engine position Sensor    Air Cleaner Vacuum Pressure Sensor   Temperature Sensor 

8. Write the Function of electronic diesel control of pumps?   Engine protection, overheating, to avoid damage the engine power output is limited.    Remote engine shut down when auxiliary equipment is in used   Constant engine speed

SNS COLLEGE OF TECHNOLOGY (An Autonomous Institution) Coimbatore-35 DEPARTMENT OF AUTOMOBILE ENGINEERING 16AU206-ELECTRONIC ENGINE MANAGEMENT SYSTEMS TWO MARK QUESTIONS & ANSWERS

UNIT 5 IGNITION SYSTEMS

1. Define solid state ignition systems? It is a process used to ignite the spark in with air fuel mixture. Main advantage to deliver a fuel in proper pressure with required temperature.

2. Write the components of solid state ?       Primary winding    Cathode    Anode      Spark Plug  3. Write the advantages of solid state ignition system?    Firing of will be proper    Cost is low    Maintenance is low   Will have more life time 

4. What are the function of ignition system?  Ignition system is a system for igniting a fuel air mixture in petrol  (gasoline) engines.  To supply a spark inside the cylinder, near the end of the compression , to ignite the compressed charge of air fuel vapor.  5. Write the design consideration for ignition system?    Air-fuel ratio    Combustion chamber design    Engine load   Intended use 

6. Define ? HEI is characterized by the incorporation of the ignition coil built into the cap for most application. The system consists of control module and a magnetic pick up mounted in the distributor. This eliminates ignition points & coil wire.

SNS COLLEGE OF TECHNOLOGY (An Autonomous Institution) Coimbatore-35 DEPARTMENT OF AUTOMOBILE ENGINEERING 16AU206-ELECTRONIC ENGINE MANAGEMENT SYSTEMS TWO MARK QUESTIONS & ANSWERS

7. Define & write the formula for calculation? Ignition Timing = 0.01737*Stroke*Ignition Timing RPM + 3 Compression Ignition Timing is set according to the time it takes to ignite and burn fuel so that the flame/pressure front contacts the TDC. Ignition Timing is measured in crank degrees.

8. What is the purpose of Dwell Meter? Contact breaker setting can be accurately measured by dwell meter.