High speed compression engines operate on
High speed compression engines operate on
The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be
The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be
In a cycle, the spark lasts roughly for
In a cycle, the spark lasts roughly for
The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)
The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)
Which of the following is not an intern’s combustion engine?
Which of the following is not an intern’s combustion engine?
The delay period in compression ignition engines depends upon
The delay period in compression ignition engines depends upon
The effective inhibitor of pre-ignition is
The effective inhibitor of pre-ignition is
Pour point of fuel oil is the
Pour point of fuel oil is the
In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as
In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as
The correct mixture strength (by weight) for petrol is about
The correct mixture strength (by weight) for petrol is about
A 5 BHP engine running at full load would consume diesel of the order of
A 5 BHP engine running at full load would consume diesel of the order of
The following volume of air is required for consuming 1 liter of fuel by a four stroke engine
The following volume of air is required for consuming 1 liter of fuel by a four stroke engine
The loud pulsating noise heard within the cylinder of an internal combustion engine is known as
The loud pulsating noise heard within the cylinder of an internal combustion engine is known as
The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is
The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is
A diesel engine is _________ as compared to petrol engine, both running at rated load.
A diesel engine is _________ as compared to petrol engine, both running at rated load.
The colour of exhaust from diesel engine is generally
The colour of exhaust from diesel engine is generally
The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is
The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is
Which of the following statements is correct?
Which of the following statements is correct?
Stoichiometric ratio is
Stoichiometric ratio is
The combustion in compression ignition engines is
The combustion in compression ignition engines is
Which of the following is false statement? Some of the methods used to reduce diesel smoke are as follows
Which of the following is false statement? Some of the methods used to reduce diesel smoke are as follows
In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.
In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.
The operation of forcing additional air under pressure into the engine cylinder is known as
The operation of forcing additional air under pressure into the engine cylinder is known as
The power actually developed by the engine cylinder of an I.C. engine is known as
The power actually developed by the engine cylinder of an I.C. engine is known as
In petrol engines, advancing of the spark timing will _________ the knocking tendency.
In petrol engines, advancing of the spark timing will _________ the knocking tendency.
The increase of cooling water temperature in petrol engine will _________ the knocking tendency.
The increase of cooling water temperature in petrol engine will _________ the knocking tendency.
The cetane number of diesel oil, generally available, is
The cetane number of diesel oil, generally available, is
Supercharging is the process of
Supercharging is the process of
Supercharging is the process of supplying the intake air to the engine cylinder at a density _________ the density of the surrounding atmosphere.
Supercharging is the process of supplying the intake air to the engine cylinder at a density _________ the density of the surrounding atmosphere.
Solid fuel fabricated into various small shapes, which are assembled to form fuel elements, is in the form of
Solid fuel fabricated into various small shapes, which are assembled to form fuel elements, is in the form of
Which of the following fuel detonates readily?
Which of the following fuel detonates readily?
The ignition quality of petrol is expressed by
The ignition quality of petrol is expressed by
Which of the following statement is correct regarding normal cetane?
Which of the following statement is correct regarding normal cetane?
A supercharged engine as compared to an ordinary engine
A supercharged engine as compared to an ordinary engine
The function of a distributor in a coil ignition system of I.C. engines is
The function of a distributor in a coil ignition system of I.C. engines is
The knocking tendency in compression ignition engines for a given fuel will be
The knocking tendency in compression ignition engines for a given fuel will be
The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.
The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.
If the compression ratio in I.C. engine increases, then its thermal efficiency will
If the compression ratio in I.C. engine increases, then its thermal efficiency will
In a four stroke cycle petrol engine, the expansion
In a four stroke cycle petrol engine, the expansion
Installation of supercharger on a four cycle diesel engine can result in the following percentage increase in power
Installation of supercharger on a four cycle diesel engine can result in the following percentage increase in power
The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in meters, and d = Dia. of rope in meters)
The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in meters, and d = Dia. of rope in meters)
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
A diesel engine, during suction stroke, draws
A diesel engine, during suction stroke, draws
The reference fuels for knock rating of spark ignition engines would include
The reference fuels for knock rating of spark ignition engines would include
Thermal efficiency of a two stroke cycle engine is _________ a four stroke cycle engine.
Thermal efficiency of a two stroke cycle engine is _________ a four stroke cycle engine.
In a petrol engine, the fuel supplied to the engine cylinder is mixed with required quantity of air and the mixture is ignited with a
In a petrol engine, the fuel supplied to the engine cylinder is mixed with required quantity of air and the mixture is ignited with a
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of
The mechanical efficiency (ηm) of the engine is given by
The mechanical efficiency (ηm) of the engine is given by
Which of the following statement is correct regarding petrol engines?
Which of the following statement is correct regarding petrol engines?
A carburettor is used to supply
A carburettor is used to supply
The ratio of the indicated thermal efficiency to the air standard efficiency is known as
The ratio of the indicated thermal efficiency to the air standard efficiency is known as
The process of breaking up or a liquid into fine droplets by spraying is called
The process of breaking up or a liquid into fine droplets by spraying is called
Morse test is used to determine the I.P. of a
Morse test is used to determine the I.P. of a
The fuels in order of decreasing knock tendency for spark ignition engines are
The fuels in order of decreasing knock tendency for spark ignition engines are
Volatility of diesel fuel oil is
Volatility of diesel fuel oil is
The minimum cranking speed in case of petrol engine is about
The minimum cranking speed in case of petrol engine is about
A mixture containing 65% of iso-octane and 35% of normal heptane will have
A mixture containing 65% of iso-octane and 35% of normal heptane will have
Pick up the wrong statement about supercharging
Pick up the wrong statement about supercharging
The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called
The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called
The frictional power (F.P.) is given by
The frictional power (F.P.) is given by
A heat engine utilizes the
A heat engine utilizes the
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called
A diesel engine as compared to petrol engine (both running and rated load) is
A diesel engine as compared to petrol engine (both running and rated load) is
The object of supercharging the engine is
The object of supercharging the engine is
Compression ratio of I.C. Engines is
Compression ratio of I.C. Engines is
The voltage required to produce a spark across the gap, between the sparking points is
The voltage required to produce a spark across the gap, between the sparking points is
The operation of forcing additional air under pressure in the engine cylinder is known as
The operation of forcing additional air under pressure in the engine cylinder is known as
The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft
The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft
The specific fuel consumption per B.P. hour for a diesel engine is about
The specific fuel consumption per B.P. hour for a diesel engine is about
Air fuel ratio at which a petrol engine cannot work is
Air fuel ratio at which a petrol engine cannot work is
Compression loss in I.C engines occurs due to
Compression loss in I.C engines occurs due to
Antiknock for compression ignition engines is
Antiknock for compression ignition engines is
In the opposed piston diesel engine, the combustion chamber is located
In the opposed piston diesel engine, the combustion chamber is located
The firing order in an I.C. engine depends upon
The firing order in an I.C. engine depends upon
Flash point of fuel oil is
Flash point of fuel oil is
In a naturally aspirated diesel engine, the air is supplied by
In a naturally aspirated diesel engine, the air is supplied by
The injection pressure in a diesel engine is about
The injection pressure in a diesel engine is about
If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by
If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by
The object of providing masked inlet valve in the air passage of compression ignition engines is to
The object of providing masked inlet valve in the air passage of compression ignition engines is to
The working pressure and temperature inside the cylinder of an internal combustion engine is _________ as compared to a steam engine.
The working pressure and temperature inside the cylinder of an internal combustion engine is _________ as compared to a steam engine.
Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to
Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to
In a typical medium speed 4-stroke cycle diesel engines
In a typical medium speed 4-stroke cycle diesel engines
The ignition quality of diesel oil is expressed by
The ignition quality of diesel oil is expressed by
Combustion in compression ignition engines is
Combustion in compression ignition engines is
Supercharging is essential in
Supercharging is essential in
The ignition of the charge by some hot surface within the engine before the passage of spark is called
The ignition of the charge by some hot surface within the engine before the passage of spark is called
Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.
Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.
The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is
The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is
If the speed of the engine is increased, the indicated power will
If the speed of the engine is increased, the indicated power will
An engine indicator is used to determine the following
An engine indicator is used to determine the following
The advancing of spark timing in spark ignition engines will _________ knocking tendency.
The advancing of spark timing in spark ignition engines will _________ knocking tendency.
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be
The octane number of petrol, generally available, is
The octane number of petrol, generally available, is
Detonation is harmful due to
Detonation is harmful due to
In a petrol engine, if diesel is used, then the engine will
In a petrol engine, if diesel is used, then the engine will
Most high speed compression engines operate on
Most high speed compression engines operate on
The knock in diesel engine occurs due to
The knock in diesel engine occurs due to
The brake power of a diesel engine, keeping other parameters constant, can be increased by
The brake power of a diesel engine, keeping other parameters constant, can be increased by
The volumetric efficiency of a well designed engine may be
The volumetric efficiency of a well designed engine may be
The specific fuel consumption per B.P. hour for a petrol engine is about
The specific fuel consumption per B.P. hour for a petrol engine is about
