Draw a labeled block diagram of CNG conversion Kit. Describe it’s working

1 Answer

Answer :

Working of CNG Kit: The Sequential Injection system still has a high pressure tank, filler, filter and regulator, the regulator is different in that it puts out a steady pressure as opposed to variable pressure. The Natural Gas is then injected by natural gas injectors which are controlled by the gasoline injector pulse. This system also uses its own MAP (manifold absolute pressure) sensor, natural gas pressure sensor, natural gas temperature sensor and coolant temperature sensor to operate and control the system.

image  

Related questions

Description : Draw a labeled block of LPG conversion kit. Describe its working.

Last Answer : Working of CNG Kit: The Sequential Injection system still has a high pressure tank, filler, filter and regulator, the regulator is different in that it puts out a steady pressure as opposed ... , natural gas temperature sensor and coolant temperature sensor to operate and control the system.

Description : Explain working of LPG kit with labeled block diagram.

Last Answer : Working of LPG Kit: LPG Tank: It is used to store the LPG at 10 bar Filler Valve: It allows the LPG into the tank while feeling. Pressure Relief Valve: It is used to limit ... regulator Mixer / gas injection which flows the LPG into the combustion chamber  Block diagram:  

Description : Draw a block diagram of CRDI system and describe its working.

Last Answer : Working of CRDI system: High pressure pump provides high pressure fuel to the common rail. The common rail stores the fuel and maintains a constant pressure in the common rail line (approximately 1500 bars.). ... rate can be modified by controlling the nozzle needle movement. OR

Description : Draw block diagram for EDC type fuel pump in diesel engine.

Last Answer : Block diagram for EDC type fuel pump in diesel engine OR

Description : Draw a labelled block diagram of CRDI system

Last Answer : block diagram of CRDI system

Description : With the help of neat sketch, describe block diagram of Electronic Diesel Control Unit (EDC).

Last Answer : EDC: The ECU determines the correct quantity of the fuel to be injected based on the inputs and the data in the look up table. The fuel input depends on the rack position and thus ECU ... ECU can also protect the engine against overheating by regulating the maximum quantity of fuel delivered.

Description : With neat labeled figure, explain the working of any two position of PCV (positive crank case ventilation) valve.

Last Answer : PCV Valve: It consists of a spring loaded tapered valve for flow control. The crankcase pressure and manifold vacuum act together to close the valve where as the spring pressure tends to keep it open.(Fig a ... back seat sealing the inlet and crankcase is protected from the back fire.(Fig d).

Description : CNG is used as alternative fuel, justify with four merits and four demerits.

Last Answer : 1. CNG reduces the harmful emission 2. Operating cost of the vehicle running on CNG is lower. 3. Reduced vehicle maintenance. 4. Fuel theft is not possible. Since NG cannot be siphoned ... 5. Inconsistent fuel properties. So above merits and demerits suggest that CNG is used as alternative fuel.

Description : Compare the following fuels on the basis of calorific value and knocking. LPG, CNG and bio-diesel 

Last Answer : Parameter LPG CNG Bio-diesel Calorific value 46.4MJ/Kg LPG has consistent & higher calorific value.  52.34 MJ/Kg Which is higher than LPG. 37.27 MJ/Kg this ... 65 which is higher than petro-diesel. So intensity of knocking is less in biodiesel compared to petro diesel.

Description : What is EGR? Explain with the help of block diagram.

Last Answer : Exhaust Gas Recirculation Valve (Operation-2 marks, Sketch-2 marks) When the engine is idling, the EGR valve is closed and there is no EGR flow into the manifold. The EGR valve remains closed until the ... exhaust gas (less than 10% of total) to be supplied into the incoming air: fuel mixture

Description : Draw P-Q diagram for stages of combustion in SI engine and write stages of combustion with its explanation.

Last Answer : The stages of combustion in S.I. engine: Stage I: Ignition Lag or Preparation Phase: It is a chemical process which depends on-nature of fuel, temperature & pressure, ... The rate of combustion reduces due to surface of the flame front becoming smaller and reduction in turbulence.

Description : Draw the circuit diagram of glow plug and explain its operation.

Last Answer : Answer: Operation of glow plug: Glow plug is an aid for cold starting of a C.I. engine. The selfignition temperature of diesel is 250°C. For compression ignition, the charge (air + diesel) ... is automatically interrupted. But starting may be attempted again as soon as the driver wishes. 

Description : Draw P-ⱷ diagram showing stages of combustion in SI engine.

Last Answer : Stages of combustion in SI engines  Stage I: Ignition Lag or Preparation Phase: The time elapsed between the fuel injection into the combustion chamber and starting of combustion. It is the growth ... reduces due to surface of the flame front becoming smaller and reduction in turbulence.   

Description : Describe the working of high pressure fuel pump. 

Last Answer : Working: Downward motion of plunger: The safety valve at the inlet opens if the pre-supply pressure of fuel exceeds 1.5 bars and fuel comes and fills the chamber till the plunger moves up to BDC. ... . A constant pressure of about 1400 to 1600 bar is maintained in the common rail. 

Description : With the help of suitable sketch describe the working of pressure regulator.

Last Answer : Working of pressure regulator : The fuel pump provides more fuel than the maximum required by the engine. Fuel not used by the engine is returned to the fuel tank. The fuel rail supplies all injectors. The pressure ... between 2.0 and 3.5 bar and allows excess fuel to return to the fuel tank.

Description : Describe the working of EGR valve with neat sketch.

Last Answer : Answer: Exhaust Gas Recirculation Valve (Operation-2 marks, Sketch-2 marks) When the engine is idling, the EGR valve is closed and there is no EGR flow into the manifold. The EGR valve remains closed ... exhaust gas (less than 10% of total) to be supplied into the incoming air: fuel mixture

Description : Describe the construction and working of D-MPFI and L-MPFI with help of neat sketch.

Last Answer : D-LMFI System: It is Manifold fuel injection system.In this type, the vacuum in the intake manifold and volume of air by its density are sensed in this type of MPFI system .As air enters into ... intake manifold , the air flow sensor measures the amount of air and sends information to ECU.

Description : Describe the working of fuel injector with neat sketch

Last Answer : Fuel Injector: The injector assembly consists of - i) a needle valve ii) a compression spring iii) a nozzle iv) an injector body When the fuel is supplied to lift the injection ... spring tension and hence the valve opening pressure is controlled by adjusting the screw provided at the top.

Description : Describe the working of electronically controlled diesel injection pump. 

Last Answer : Answer: Electronically controlled diesel injection pump: This is similar to conventional pumps, but its injection is controlled by Electronic Control Unit (ECU) which control solenoid valve in the injection pump ... modifies the current to the solenoid valve, to supply fuel as per requirement.  

Description : Describe construction and working of TBI system with suitable sketch.

Last Answer : Construction and working of TBI system: Throttle Body Injection is an electronically controlled injection system in which an electronic fuel injector injects the fuel intermittently in to the intake manifold ... to calculate the triggering signals for the injectors and other system actuators.

Description :  Draw a neat labeled block diagram of 3-phase Electronic Energy meter.

Last Answer : Labeled diagram of 3-phase electronic energy meter:

Description : Draw the labeled block diagram of process control system and explain each block.

Last Answer : Explanation - Process control system consists of process or plant, sensor, error detector, automatic Controller, actuator or control element. 1) Process or plant- process means some manufacturing sequence ... process which changes the process variable. Output of this block is denoted by u .

Description : Draw a labeled block diagram of sine wave generator and state function of each block. 

Last Answer : Function Generator:  This instrument can deliver sine, triangular & square waves with frequency range of 0.01 Hz to 100 kHz.  The frequency control network is governed by a frequency ... voltage reaches a predetermined level on the negative slope of the integrator's output voltage.

Description : Draw neat sketch of pre-combustion chamber and name its parts.

Last Answer : Fig. Pre-combustion chamber

Description : Draw neat sketch to show TBI system of SI engine and name its parts.

Last Answer : Draw neat sketch to show TBI system of SI engine and name its parts.

Description : Draw a layout of fuel injection system in CRDI diesel engine. State its fundamental requirement.

Last Answer : Fundamental requirement:-The line diagram of CRDI shows that the system is controlled by ECU. The sensors in the system are used to feed the input in the ECU.ECU will provide the signal ... fuel injector, common rail, High pressure fuel pump, ECM/ECU, Pressure sensor, Rail pressure limiter. 

Description : State the different types of SI engine combustion chambers. Draw a neat sketch of any one.

Last Answer : 1) T Head Type Combustion chambers 2) L Head Type Combustion chambers 3) F- Head combustion chamber 4) Over head valve or I head combustion chamber 5) Hemispherical combustion chamber 6) Bathtub ... - Head combustion chamber 4) Over head valve or I head combustion chamber

Description : Draw neat sketch of swirl type combustion chamber of IDI engine.

Last Answer : Fig. swirl type combustion chamber of IDI engine.

Description : Explain the phenomenon of diesel knocking with the help of P-Ø diagram.

Last Answer : Explanation- The knock phenomenon of C.I. engine depends upon delay period. If delay period is small then less amount of fuel is admitted into cylinder. When small amount of ... I. engines, higher compression ratio causes lesser ignition delay and hence lesser possibility of diesel knocks.

Description : Explain working of Variable Valve Timing and Electronic lift control (VTEC) system. Enlist its advantage and Drawbacks

Last Answer : Answer: Working of Variable Valve Timing and Electronic lift control (VTEC) system:- VTEC (which stands for Variable Valve Timing and Lift Electronic Control) is an electronic and mechanical system ... 2) Maintenance cost is high 3) Very complex structure required complicated control system.

Description : Explain the working computer controlled EGR system.

Last Answer : Exhaust Gas recirculation: EGR System is control by the ECM. A pressure sensor monitors the exhaust system pressure. The sensor signals this information of pressure to the ECM. The ECM sends the signal ... open and close the EGR valve. Thus it controls the amount of exhaust gas recalculated.

Description : Explain the working of series hybrid vehicle.

Last Answer : Series-Hybrid vehicle In Series Hybrid vehicles, the Internal Combustion Engine (ICE) drives a generator, which charges the battery and supplies current to the electronically controlled motor. The electric motor ... have to be rated to the maximum power. It has low overall system efficiency.

Description : List the actuators used in MPFI system and working of any one. 

Last Answer : Actuators of MPFI 1.Fuel Injector 2. Idle speed control valve. 3. Inlet metering valve. 4. Vacuum solenoid valve 5. Cam actuators. Fuel Injector-In MPFI system, Top feed fuel ... fuel between the Pintle and discharge opening to form a fine spray pattern that has a cone shape.  

Description : Explain the working of diesel engine glow plugs with neat sketch

Last Answer : Glow plug is an aid for cold starting of a C.I. engine. The self-ignition temperature of diesel is 250°C. For compression ignition, the charge (air + diesel) should reach a temperature of ... plugs is automatically interrupted. But starting may be attempted again as soon as the driver wishes.   

Description : Explain the construction and working of throttle body injection (TBI) system. 

Last Answer : The throttle body injection (TBI) system uses one or two injector valves mounted in a throttle body assembly. The injectors spray fuel into the top of the throttle body air horn The TBI fuel ... are then used to calculate the triggering signals for the injectors and other system actuators.  

Description : What is hybrid vehicle? Explain working with the help of layout of a series hybrid vehicle. 

Last Answer : Hybrid Vehicle: A hybrid vehicle is one that uses two different methods to propel the vehicle. A hybrid electric vehicle, abbreviated HEV uses both an internal combustion engine and an electric motor to propel ... have to be rated to the maximum power. It has low overall system efficiency.

Description : Explain the working of high pressure accumulator in CRDI system. 

Last Answer : In common rail systems, a high-pressure pump stores a reservoir of fuel at high pressure - up to and above 2,000 bars (psi). The term "common rail" refers to the fact that ... in that it only has to maintain a commanded pressure at a target (either mechanically or electronically controlled). 

Description : Draw the block diagram of basic wind energy conversion system and write function of each block. 

Last Answer : Block diagram of basic wind energy conversion system: OR Components of wind power plant and their functions:  1) Rotor /Blade/Aero-turbine: Blade extracts significant power from the ... stronger and smoother. Towers are supports to raise the main part of the turbine up in the air.

Description : List three methods of fuel injection. Describe sequential method with suitable sketch.

Last Answer : Methods of petrol injection 1. Sequential fuel injection. (SFI) 2. Grouped fuel injection. 3. Simultaneous fuel injection 4. Continuous injection.  Sequential Injection: Each injector ... to crank/ camshaft position and pulse width, can be optimized for each individual cylinder.

Description : Describe air fuel- ratio requirements for diesel engines at no load to full load.

Last Answer : Irrespective of load at any given speed, an approximately constant supply of air enters the cylinder. With change in load, the quantity of fuel injected is changed varying the air fuel ratio. The ... engine always designed to operate with an excess air of 15 to 40% depending upon the application

Description : State input and output control functions of ECM. Describe the idle speed control with sketch. 

Last Answer : Inputs and outputs of Electronic Control Module The inputs of ECM 1. The Ignition (Engine Speed Sensor). 2. Temperature Sensor (Coolant Temperature). 3. Throttle Potentiometer (Intake ... through. The Idle speed control valve stepper motor allows 125 possible valve opening positions. 

Description : Write neat sketch, describe MPFI system.

Last Answer : MPFI system In the port injection arrangement, the injectoe is placed on the side of the intake manifold near the intake port. The injector sprays gasoline into the air, inside the intake manifold. The ... manifold. If there are six cylinders, there will be six injectors as shown in figure.

Description : Describe four effects of detonation.

Last Answer : 1. Noise and roughness: Mild knock is seldom audible and is not harmful. When intensity of knock increases a loud pulsating noise is produced due to development of a pressure wave. The ... and combustion chamber wall and this overheating leads to ignite the charge before the passage of spark.

Description : Describe the concept of Gasoline Direct Injection (GDI)

Last Answer : Gasoline Direct Injection (GDI), also known as Petrol Direct Injection. This system is employed in modern two-stroke and four-stroke gasoline engines. The gasoline is highly pressurized, and ... mixtures are much leaner than in a conventional engine and reduce fuel consumption considerably.  

Description : Describe with neat sketch operation of PCV valve under different engine operating condition to control/ emission

Last Answer : PCV Valve: It consists of a spring loaded tapered valve for flow control. The crankcase pressure and manifold vacuum act together to close the valve whereas the spring pressure tends to keep it open.( ... at idle and low speed (c)High speed/Load operation (d)Preventing backfire during cranking  

Description : Describe DTSI system. Write two advantage of it. 

Last Answer : DTSI technology provides a combination of the light weight and twice the power offered by two-stroke engines with a significant power boost, i.e. a considerably high "power-to ... winter season & cold climatic conditions or at very  low temperatures because of increased Compression ratio

Description : Describe four properties of gasoline as a fuel for SI engine

Last Answer : Volatility: volatility depend upon fractinal composition of fuel. Method of measuring volatility has been standardized by ASTM ( American society of Testing Materials) and the graohical representation ... gasoline to improve the gasoline stability during storage by inhibiting the formation of gums.

Description : Describe glow plug. Why and where it is used.

Last Answer : Glow Plug: Some diesel engines use an electric heater called glow plug inside the cylinders to heat the intake air and help ignite fuel: air mixture. Glow plug is an aid for cold starting of a ... into the secondary chamber. On D.I engines, the glow element extends into the main combustion chamber. 

Description : List three method of fuel injection. Describe any one.

Last Answer : Methods of petrol injection 1. Sequential fuel injection. (SFI) 2. Grouped fuel injection. 3. Simultaneous fuel injection 4. Continuous injection. Sequential Injection: Each injector is ... to crank/camshaft position and pulse width, can be optimized for each individual cylinder.  

Description : Describe any four variable affection detonations.

Last Answer : Variable affecting detonations. 1. Temperature : Increasing the temperature of the unburned mixture increase the possibility of knock in the SI engine following are the effect on SI engine ... atmospheric humidity decreases the tendency to knock by decreasing the reaction time of the fuel.