L-MPFI system uses a) port injection b) direct injection c) manifold injection d) throttle body injection

L-MPFI system uses a) port injection b) direct injection c) manifold injection d) throttle body injection
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Answer: a Explanation: L-MPFI system uses port injection while multi-point fuel injection system uses port injection and throttle body injection while D-MPFI system uses direct injection.
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D-MPFI system uses a) port injection b) direct injection c) manifold injection d) throttle body injection

Description : D-MPFI system uses a) port injection b) direct injection c) manifold injection d) throttle body injection

Last Answer : Answer: b Explanation: D-MPFI system uses direct injection and L-MPFI system uses port injection while multipoint fuel injection system uses port injection and throttle body injection.

The _____________ sensor, senses rotation of engine camshaft for speed and timing of injection. a) throttle position b) manifold pressure c) camshaft position d) knock

Description : The _____________ sensor, senses rotation of engine camshaft for speed and timing of injection. a) throttle position b) manifold pressure c) camshaft position d) knock

Last Answer : Answer: c Explanation: The camshaft position sensor, senses rotation of engine camshaft for speed and timing of injection whereas the throttle position sensor, senses the movement of the throttle ... engine intake manifold so that the mixture strength can be adjusted with changes in engine load.

The _____________ sensor,is a microphone type sensor that detects ping or pre-ignition noise so that the ignition timing can be retarded. a) throttle position b) manifold pressure c) camshaft position d) knock

Description : The _____________ sensor,is a microphone type sensor that detects ping or pre-ignition noise so that the ignition timing can be retarded. a) throttle position b) manifold pressure c) camshaft position d) knock

Last Answer : Answer: d Explanation: The knock sensor,is a microphone type sensor that detects ping or pre-ignition noise so that the ignition timing can be retarded while the camshaft position sensor, senses ... the engine intake manifold so that the mixture strength can be adjusted with changes in engine load.

The ___________ sensor, monitors vacuum in the engine intake manifold so that the mixture strength can be adjusted with changes in engine load. a) throttle position b) manifold pressure c) camshaft position d) knock

Description : The ___________ sensor, monitors vacuum in the engine intake manifold so that the mixture strength can be adjusted with changes in engine load. a) throttle position b) manifold pressure c) camshaft position d) knock

Last Answer : Answer: b Explanation: The manifold pressure sensor, monitors vacuum in the engine intake manifold so that the mixture strength can be adjusted with changes in engine load and the camshaft position sensor, senses rotation of engine camshaft for speed and timing of injection.

The _____________ sensor, senses the movement of the throttle plate so that the mixture flow can be adjusted for engine speed and acceleration. a) throttle position b) manifold pressure c) camshaft position d) knock

Description : The _____________ sensor, senses the movement of the throttle plate so that the mixture flow can be adjusted for engine speed and acceleration. a) throttle position b) manifold pressure c) camshaft position d) knock

Last Answer : Answer: a Explanation: The throttle position sensor, senses the movement of the throttle plate so that the mixture flow can be adjusted for engine speed and acceleration while the manifold ... the camshaft position sensor, senses rotation of engine camshaft for speed and timing of injection.

Mixing of air and fuel in the diesel engine occurs in a. injection pump b. carburetor c. engine cylinder d. inlet manifold

Description : Mixing of air and fuel in the diesel engine occurs in a. injection pump b. carburetor c. engine cylinder d. inlet manifold

Last Answer : ANSWER c. engine cylinder

Compare throttle body injection with port fuel injection systems.

Description : Compare throttle body injection with port fuel injection systems.

Last Answer : Sr. No. TBI system PFI System 1 Fuel is injected into the center of the throttle body. Fuel is injected into the port 2 TBI uses bottom feed ... the throttle body. Hither power output due to low resistance at intake manifold and higher volumetric efficiency.

Common rail injection system uses injection pressures of the order a) 100-200 bar b) 200-400 bar c) 400-600 bar d) 1500 bar

Description : Common rail injection system uses injection pressures of the order a) 100-200 bar b) 200-400 bar c) 400-600 bar d) 1500 bar

Last Answer : Answer: d Explanation: Generally, common rail injection system uses injection pressures of the order 1500 bar.

The _____________ sensor, monitors mass or volume of air flowing into the intake manifold for adjusting the quantity of fuel. a) engine temperature b) exhaust gas c) air flow d) air inlet temperature

Description : The _____________ sensor, monitors mass or volume of air flowing into the intake manifold for adjusting the quantity of fuel. a) engine temperature b) exhaust gas c) air flow d) air inlet temperature

Last Answer : Answer: c Explanation: The air flow sensor, monitors mass or volume of air flowing into the intake manifold for adjusting the quantity of fuel while exhaust gas senor senses the amount of oxygen in the engine exhaust and calculates air-fuel ratio.

The condition of refrigerant before entering the expansion or throttle valve, in a vapour compression system (a) dry vapour (b) wet vapour (c)liquid-vapour mixture (d) high pressure saturated liquid

Description : The condition of refrigerant before entering the expansion or throttle valve, in a vapour compression system (a) dry vapour (b) wet vapour (c)liquid-vapour mixture (d) high pressure saturated liquid

Last Answer : Ans: d

In vapour compression cycle the condition of refrigerant is superheated vapour (a) after passing through the condenser (b) before passing through the condenser (c) after passing through the expansion or throttle valve (d) beforeentering the expansion valve

Description : In vapour compression cycle the condition of refrigerant is superheated vapour (a) after passing through the condenser (b) before passing through the condenser (c) after passing through the expansion or throttle valve (d) beforeentering the expansion valve

Last Answer : Ans: b

In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid (a) after passing through the condenser (b) before passing through the condenser (c) after passing through the expansion or throttle valve (d) before entering the expansion valve

Description : In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid (a) after passing through the condenser (b) before passing through the condenser (c) after passing through the expansion or throttle valve (d) before entering the expansion valve

Last Answer : Ans: d

In vapour compression cycle, the condition of refrigerant is very wet vapour (a) after passing through the condenser (b) before passing through the condenser (c) after passing through the expansion or throttle valve (d) before entering the expansion valve

Description : In vapour compression cycle, the condition of refrigerant is very wet vapour (a) after passing through the condenser (b) before passing through the condenser (c) after passing through the expansion or throttle valve (d) before entering the expansion valve

Last Answer : Ans: c

In vapour compression cycle, the condition of refrigerant is saturated liquid (a) after passing through the condenser (b) before passing through the condenser (c) after passing through the expansion throttle valve (d) before entering the expansion valve

Description : In vapour compression cycle, the condition of refrigerant is saturated liquid (a) after passing through the condenser (b) before passing through the condenser (c) after passing through the expansion throttle valve (d) before entering the expansion valve

Last Answer : Ans: a

In spark ignition engines, the knocking tendency can be decreased by a) decreasing compression ratio b) controlling intake throttle c) controlling ignition timing d) adding dopes like tetraethyl lead and ethylene dibromide

Description : In spark ignition engines, the knocking tendency can be decreased by a) decreasing compression ratio b) controlling intake throttle c) controlling ignition timing d) adding dopes like tetraethyl lead and ethylene dibromide

Last Answer : Answer: d Explanation: None.

Name the sensors which are placed at intake manifold ,throttle valve, water jacket and exhaust manifold.

Description : Name the sensors which are placed at intake manifold ,throttle valve, water jacket and exhaust manifold. 

Last Answer : Sensors: Intake manifolds:- Mass air flow sensor (MAF), Manifold absolute pressure sensor (MAP) Throttle valve:- Throttle position sensor (TPS) Water jacket:- Engine temperature sensor or coolant temperature sensor Exhaust manifolds: - Exhaust gas temperature sensor, Oxygen sensor (O2)

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

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.  

In _____________ injection system only one pump is sufficient for multi-cylinder engine. a) air b) mechanical c) compression fuel d) common rail

Description : In _____________ injection system only one pump is sufficient for multi-cylinder engine. a) air b) mechanical c) compression fuel d) common rail

Last Answer : Answer: d Explanation: None.

Removal of air from the pipeline is termed as ____________ in injection system. a) bleeding b) wound c) sweating d) none of the mentioned

Description : Removal of air from the pipeline is termed as ____________ in injection system. a) bleeding b) wound c) sweating d) none of the mentioned

Last Answer : Answer: a Explanation: Generally, the removal of air from the pipeline is termed as bleeding in injection system.

Continuous injection system usually has a) plunger pump b) rotary pump c) gear pump d) vane pump

Description : Continuous injection system usually has a) plunger pump b) rotary pump c) gear pump d) vane pump

Last Answer : Answer: b Explanation: In common use continuous injection system usually has rotary pump.

Solid injection in CI engine means injection of A. solid fuel only B. liquid fuel only C. liquid fuel and air D. solid fuel and air

Description : Solid injection in CI engine means injection of A. solid fuel only B. liquid fuel only C. liquid fuel and air D. solid fuel and air

Last Answer : ANSWER : B

Solid injection is also called ________________ a) air injection b) mechanical injection c) compression fuel injection d) none of the mentioned

Description : Solid injection is also called ________________ a) air injection b) mechanical injection c) compression fuel injection d) none of the mentioned

Last Answer : Answer: b Explanation: Generally, solid injection is also called mechanical injection.

The methods used on fuel injection are : a) air injection b) mechanical injection c) solid fuel injection d) all of the mentioned

Description : The methods used on fuel injection are : a) air injection b) mechanical injection c) solid fuel injection d) all of the mentioned

Last Answer : Answer: d Explanation: The methods used on fuel injection are air injection, mechanical injection and solid fuel injection.

In electronic fuel injection, there is improvement in the _____________ efficiency due to comparatively less resistance in the intake manifolds which will cause less pressure losses. a) mechanical b) volumetric c) overall d) none of the mentioned

Description : In electronic fuel injection, there is improvement in the _____________ efficiency due to comparatively less resistance in the intake manifolds which will cause less pressure losses. a) mechanical b) volumetric c) overall d) none of the mentioned

Last Answer : Answer: b Explanation: In electronic fuel injection, there is improvement only in the volumetric efficiency due to comparatively less resistance in the intake manifolds which will cause less pressure losses and no other efficiencies are hindered.

With EFI of diesel engines a) sharp start and stop is not possible b) very high injection pressure can be obtained c) sudden cylinder cut-off is impossible d) diagnostic properties are poor

Description : With EFI of diesel engines a) sharp start and stop is not possible b) very high injection pressure can be obtained c) sudden cylinder cut-off is impossible d) diagnostic properties are poor

Last Answer : Answer: b Explanation: Generally, with EFI of diesel engines very high injection pressure can be obtained.

A 4S diesel engine, when running at 2000 rpm has an injection duration of 1.5 ms.What is the corresponding of the crank angle in degrees? (a) 18° (b) 9° (c)36° (d) 15°

Description : A 4S diesel engine, when running at 2000 rpm has an injection duration of 1.5 ms.What is the corresponding of the crank angle in degrees? (a) 18° (b) 9° (c)36° (d) 15°

Last Answer : Ans :a

Which of the following factors increases the tendency of knocking in the CI engines? (a) Increasing both the r and coolant temperatures (b) Increasing both the speed and the injection advance (c) Increasing the speed, injection advance and coolant temperature (d) Increasing the compression ratio

Description : Which of the following factors increases the tendency of knocking in the CI engines? (a) Increasing both the r and coolant temperatures (b) Increasing both the speed and the injection advance (c) Increasing the speed, injection advance and coolant temperature (d) Increasing the compression ratio

Last Answer : Ans :c

The tendency of knocking in CI engine reduces by (a) High self ignition temperature of fuel (b) Decrease in jacket water temperature (c) Injection of fuel just before TDC (d) Decrease in injection pressure

Description : The tendency of knocking in CI engine reduces by (a) High self ignition temperature of fuel (b) Decrease in jacket water temperature (c) Injection of fuel just before TDC (d) Decrease in injection pressure

Last Answer : Ans :c

In a 4 S diesel engine, the term ‘squish’ refers to the (a) Injection of fuel in the precombustion chamber (b) Discharge of gases from the precombustion chamber (c) Entry of air into the combustion chamber (d) Stripping of fuel from the core

Description : In a 4 S diesel engine, the term ‘squish’ refers to the (a) Injection of fuel in the precombustion chamber (b) Discharge of gases from the precombustion chamber (c) Entry of air into the combustion chamber (d) Stripping of fuel from the core

Last Answer : Ans :c

The process of breaking up a liquid into fine droplets by spraying is called a. vaporization b. carburetion c. injection d. atomization

Description : The process of breaking up a liquid into fine droplets by spraying is called a. vaporization b. carburetion c. injection d. atomization

Last Answer : ANSWER d. atomization

Rate of burning in the compression ignition engine can be controlled by a. rate of injection of fuel b. rate of air taken into carburetor c. both a. and b. d. none of the above

Description : Rate of burning in the compression ignition engine can be controlled by a. rate of injection of fuel b. rate of air taken into carburetor c. both a. and b. d. none of the above

Last Answer : ANSWER a. rate of injection of fuel

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

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.

Aqua ammonia is used as refrigerant in the following type of refrigeration system (a) compression (b) direct (c) indirect (d) absorption

Description : Aqua ammonia is used as refrigerant in the following type of refrigeration system (a) compression (b) direct (c) indirect (d) absorption

Last Answer : Ans: d

Absorption system normally uses the following refrigerant (a) Freon-11 (b) Freon-22 (c) C02 (d) ammonia.

Description : Absorption system normally uses the following refrigerant (a) Freon-11 (b) Freon-22 (c) C02 (d) ammonia.

Last Answer : Ans: e

For a multistage compressor, the polytropic efficiency is A. the efficiency of all stages combined together B. the efficiency of one stage C. Constant throughout for all the stages D. a direct consequence of the pressure ratio

Description : For a multistage compressor, the polytropic efficiency is A. the efficiency of all stages combined together B. the efficiency of one stage C. Constant throughout for all the stages D. a direct consequence of the pressure ratio

Last Answer : ANSWER : C

Domestic refrigerator working on vapour compression cycle uses the following type of expansion device (a) electrically operated throttling valve (b) manually operated valve (c) thermostatic valve (d) capillary tube

Description : Domestic refrigerator working on vapour compression cycle uses the following type of expansion device (a) electrically operated throttling valve (b) manually operated valve (c) thermostatic valve (d) capillary tube

Last Answer : Ans: d

The domestic refrigerator uses following type of compressor (a) centrifugal (b) axial (c) miniature sealed unit (d) piston type reciprocating

Description : The domestic refrigerator uses following type of compressor (a) centrifugal (b) axial (c) miniature sealed unit (d) piston type reciprocating

Last Answer : Ans: d

Which of the following cycles uses air as the refrigerant? (a) Ericsson (b) Stirling (c) Carnot (d) Bell-coleman

Description : Which of the following cycles uses air as the refrigerant? (a) Ericsson (b) Stirling (c) Carnot (d) Bell-coleman

Last Answer : Ans: d

The cooling tower uses the phenomenon of evaporative cooling to cool warm water above the dbt of air. A. true B. false

Description : The cooling tower uses the phenomenon of evaporative cooling to cool warm water above the dbt of air. A. true B. false

Last Answer : ANSWER : B

Heat engine uses ______ energy to produce mechanical work. a. Thermal b. Fluid c. Kinetic d. Electric (Ans:a)

Description : Heat engine uses ______ energy to produce mechanical work. a. Thermal b. Fluid c. Kinetic d. Electric (Ans:a)

Last Answer : Which of the following is not an internal Combustion (IC) engine? a. Gas engine b. Wankel engine c. Jet engine d. Stirling engine (Ans:d)

Air standard cycle uses ____ as a working medium. a. Perfect gas b. Real gas c. Ideal gas d. Natural gas

Description : Air standard cycle uses ____ as a working medium. a. Perfect gas b. Real gas c. Ideal gas d. Natural gas

Last Answer : ANSWER a. Perfect gas

What are the symptoms of a failed fuel pressure regulator on a 1988 Mercury Cougar with a 3.8L MPI (multi port injection) V6 engine?

Description : What are the symptoms of a failed fuel pressure regulator on a 1988 Mercury Cougar with a 3.8L MPI (multi port injection) V6 engine?

Last Answer : Okay I’m shooting from the hip; car runs rough, stalls when coming to a stop, tailpipe is blackened and dark smoke comes out, oil smells like gasoline and gas mileage has dropped.

List four types of sensors used in MPFI system, state their locations and functions.

Description : List four types of sensors used in MPFI system, state their locations and functions.

Last Answer : Sr. Name Function Location 1 Oxygen Sensor Measuring the quantity of oxygen in exhaust  Located at inlet and outlet side of catalytic converter 2 Mass air flow(MAF ... the combustion process and supplies signal to the ECU. This sensor is fitted on cylinder block.

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

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.  

Give any four sensors used in MPFI system.

Description : Give any four sensors used in MPFI system.

Last Answer : Four sensors used in MPFI system: 1) Oxygen sensor 2) Mass air flow (MAF) sensor 3) Coolant temperature sensor 4) Throttle position sensor 5) Crank position sensor 6) Manifold absolute pressure sensor ... Sensor 9) Knock Sensor 10) Cam Shaft Position Sensor 11) Intake air temperature sensor (IAT) 

Write neat sketch, describe MPFI system.

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.

Compare carbureted engine fuel supply system with MPFI system.

Description : Compare carbureted engine fuel supply system with MPFI system.

Last Answer : Sr.No. Carbureted fuel supply system MPFI fuel supply system 1 Mal-distribution of charge.  Uniform distribution of charge.  2 Due to resistance in intake manifold volumetric ... is take place inside the manifold. fuel being injected into or close to the cylinder. 

Compare carbureted engine with MPFI engine

Description : Compare carbureted engine with MPFI engine

Last Answer : Sr.  Carbureted fuel system Electronic fuel injection system 1 Mal-distribution of charge.  Uniform distribution of charge.  2 Due to resistance in intake manifold volumetric ... is take place inside the manifold. Fuel being injected into or close to the cylinder. 

State FOUR advantages if MPFI engine.

Description : State FOUR advantages if MPFI engine.

Last Answer : Advantages if MPFI engine. 1) MPFI improved fuel consumption. 2) Better Drivability. 3) ECM technique is used to control the engine. 4) Precise supply of air-fuel mixture 5) Engine ... -fuel mixture. 9) Cleaner emissions 10) MPFI improves functionality and durability of the engine components.

Following are the diagnostic tools used in fault finding of MPFI engines

Description : Following are the diagnostic tools used in fault finding of MPFI engines

Last Answer : 1. Engine Code Readers 2. Compression Testers 3. Spark Plug Testers 4. Mechanic’s Stethoscope 5. Scan Tool 6. Battery Tester 7. Power Probe III