Recent questions tagged combustion

The calorific value of fuel is expressed in unit called a) kilojoule per litre c) kilogram per millilitre b) kilogram per gram d) kilo joule per kilogram

Description : The calorific value of fuel is expressed in unit called a) kilojoule per litre c) kilogram per millilitre b) kilogram per gram d) kilo joule per kilogram

Last Answer : d) kilo joule per kilogram

Choose the incorrect statement from the following : Forest fires are usually due to a) carelessness of humans c) heat of sun b) cutting of trees d) lightning strike

Description : Choose the incorrect statement from the following : Forest fires are usually due to a) carelessness of humans c) heat of sun b) cutting of trees d) lightning strike

Last Answer : b) cutting of trees

Choose the correct statement about inflammable substance from the following. They have a) low ignition temperature and cannot catch fire easily. b) high ignition temperature and can catch fire easily . c) low ignition temperature and can catch fire easily d) high ignition temperature and cannot catch fire easily

Description : Choose the correct statement about inflammable substance from the following. They have a) low ignition temperature and cannot catch fire easily. b) high ignition temperature and can catch fire easily ... temperature and can catch fire easily d) high ignition temperature and cannot catch fire easily

Last Answer : c) low ignition temperature and can catch fire easily

On placing an inverted tumbler over a burning candle, the flame extinguishes after some – time . This is because of non –availability of a) oxygen b)water vapour c)carbon dioxide d)wax

Description : On placing an inverted tumbler over a burning candle, the flame extinguishes after some – time . This is because of non –availability of a) oxygen b)water vapour c)carbon dioxide d)wax

Last Answer : a) oxygen

The substance that does not burn with flame is a) LPG b)camphor c)dry grass d)charcoal

Description : The substance that does not burn with flame is a) LPG b)camphor c)dry grass d)charcoal

Last Answer : d)charcoal

Magnesium ribbon on burning in air produces a) magnesium oxide ,water and light c) magnesium oxide and heat b) magnesium oxide , heat and light d) magnesium oxide, water and heat

Description : Magnesium ribbon on burning in air produces a) magnesium oxide ,water and light c) magnesium oxide and heat b) magnesium oxide , heat and light d) magnesium oxide, water and heat

Last Answer : b) magnesium oxide , heat and light

Which one of the following has highest calorific value? a) kerosene b)biogas c)LPG d)petrol

Description : Which one of the following has highest calorific value? a) kerosene b)biogas c)LPG d)petrol

Last Answer : c)LPG

A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance? a) iron nail b)glass c)stone piece d)wood

Description : A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance? a) iron nail b)glass c)stone piece d)wood

Last Answer : d)wood

On a cold winter night , the process sleeping in a room with closed door and windows with coal fire burning inside may die due to the excessive accumulation of a) nitrogen monoxide b) nitrogen dioxide c) carbon dioxide d) carbon monoxide

Description : On a cold winter night , the process sleeping in a room with closed door and windows with coal fire burning inside may die due to the excessive accumulation of a) nitrogen monoxide b) nitrogen dioxide c) carbon dioxide d) carbon monoxide

Last Answer : d) carbon monoxide

The ________ zone of a candle flame is the hottest zone. a) innermost b)outermost c)middle d)none

Description : The ________ zone of a candle flame is the hottest zone. a) innermost b)outermost c)middle d)none

Last Answer : b)outermost

The _________ gas produced during burning of coal is responsible for causing acid rain . a) oxygen b)sulphur dioxide c)nitrogen d)water vapour

Description : The _________ gas produced during burning of coal is responsible for causing acid rain . a) oxygen b)sulphur dioxide c)nitrogen d)water vapour

Last Answer : b)sulphur dioxide

The lowest temperature which at which a substance catches fire is ________ temperature. a) ignition b)boiling c)freezing d)none

Description : The lowest temperature which at which a substance catches fire is ________ temperature. a) ignition b)boiling c)freezing d)none

Last Answer : a) ignition

________ fuels produce least amount of harmful gases and do not leave behind solid residue on combustion. a) solid b)gaseous c)liquid d )semi-solid

Description : ________ fuels produce least amount of harmful gases and do not leave behind solid residue on combustion. a) solid b)gaseous c)liquid d )semi-solid

Last Answer : b)gaseous

Increase in temperature due to excess of carbon dioxide in air which traps heat energy is known as _______ . a) global warming b)soot c)ash d)acid rain

Description : Increase in temperature due to excess of carbon dioxide in air which traps heat energy is known as _______ . a) global warming b)soot c)ash d)acid rain

Last Answer : a) global warming

The unit of calorific value of fuel is __________ . a) Kj /Kg b) J/Kg c)Kj /g d)J/g

Description : The unit of calorific value of fuel is __________ . a) Kj /Kg b) J/Kg c)Kj /g d)J/g

Last Answer : a) Kj /Kg

The middle zone of a candle flame is known as the ________ zone. a) luminous b)non-luminous c)wax d)burning

Description : The middle zone of a candle flame is known as the ________ zone. a) luminous b)non-luminous c)wax d)burning

Last Answer : a) luminous

_______ is highly poisonous gas produced as a result of incomplete combustion. a) oxygen b)carbon dioxide c)carbon mono oxide d)soot

Description : _______ is highly poisonous gas produced as a result of incomplete combustion. a) oxygen b)carbon dioxide c)carbon mono oxide d)soot

Last Answer : c)carbon mono oxide

_________ is a substance which undergoes spontaneous combustion. a) wood b)coal c)sodium d)cow dung cakes

Description : _________ is a substance which undergoes spontaneous combustion. a) wood b)coal c)sodium d)cow dung cakes

Last Answer : c)sodium

________ present in air helps in combustion of fuel. a) oxygen b)nitrogen c)carbon-di-oxide d)carbon –mono-oxide

Description : ________ present in air helps in combustion of fuel. a) oxygen b)nitrogen c)carbon-di-oxide d)carbon –mono-oxide

Last Answer : a) oxygen

The material which on heating in presence of oxygen catches fire easily and produces heat and light energy is known as _________ material. a) combustible b)non-combustible c)conducting d)none

Description : The material which on heating in presence of oxygen catches fire easily and produces heat and light energy is known as _________ material. a) combustible b)non-combustible c)conducting d)none

Last Answer : a) combustible

Discuss in brief process of combustion in SI engines with a sketch.

Description : Discuss in brief process of combustion in SI engines with a sketch.

Last Answer : Combustion In S I Engine According to Ricardo, There are three stages of combustion in SI Engine as shown in figure above 1. Ignition lag stage 2. Flame propagation stage 3. After ... combustion is known as after burning. This generally happens when the rich mixture is supplied to engine. 

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