What is the relationship between calorific value and efficiency of a fuel How is calorific value expressed?( 2?

The efficiency of fuel of food is dependent on the calorific value; higher the value, higher the efficiency, and similarly lower the calorific value, lower is the efficiency. Therefore, it can be said that the calorific value of a substance is directly related to or proportional to its efficiency.

How is calorific value related to a fuel?

The calorific value of food indicates the total amount of energy, a human body could generate during its metabolism which is expressed in Kilojoules per 100 grams or 100 ml. The calorific value of food is generally expressed in kilocalories i.e. kcal….Calorific Value of Fuel.

What is the difference between fuel consumption and specific fuel consumption?

Specific fuel consumption is the amount of fuel consumed by a vehicle for each unit of power output. A vehicle’s specific fuel consumption is more or less independent from its nitrogen oxide emissions per kilometer. The specific fuel consumption of an engine is the rate of fuel burnt to produce a unit of thrust.

What is the formula of specific fuel consumption?

In traditional units, it measures fuel consumption in pounds per hour divided by the brake horsepower, lb/(hp⋅h); in SI units, this corresponds to the inverse of the units of specific energy, kg/J = s2/m2. It may also be thought of as power-specific fuel consumption, for this reason.

What is the difference between fuel efficiency and calorific value?

Fuel efficiency is measured as the amount of heat that 1 kg of fuel (any fuel) produces on combustion. This is known as the calorific value of the fuel. The unit of measurement of fuel efficiency is kilojoules per kg, i.e. kJ/kg.

What do you mean by calorific value of a fuel distinguish between gross and net calorific value of fuel?

The key difference between net calorific value and gross calorific value is that net calorific value is the amount of heat that is created when water is converted into water vapor upon combustion of a material, whereas gross calorific value is the amount of heat created when water is converted into water vapor and back …

What is calorific value of a fuel define gross calorific value and net calorific value of a fuel and write down the relation between them?

Net Calorific Value & Gross Calorific Value So the gross calorific value indicates how much energy can be released during the complete combustion of a given amount of fuel: It is comprised of the net calorific value plus the energy contained in the exhaust gases and in the water vapor produced during combustion.

What is the difference between mileage and MPG?

MPG, or miles per gallon, is the distance, measured in miles, that a car can travel per gallon of fuel. MPG is also the primary measurement of a car’s fuel efficiency: The higher a car’s MPG, the more fuel efficient it is.

What is the relation between thermal efficiency and specific fuel consumption Mcq?

Explanation: Specific fuel consumption is the ratio of fuel consumption rate to the power produced. Thermal efficiency is the ratio of the power produced to the fuel consumption rate. Hence both are inversely proportional to each other.

What affects specific fuel consumption?

SFC is dependent on engine design, but differences in the SFC between different engines using the same underlying technology tend to be quite small. SFC varies with throttle setting, altitude, climate. For jet engines, air flight speed is an important factor too. Air flight speed counteracts the jet’s exhaust speed.

What do you mean by fuel efficiency what role it plays in selection of fuel?

Fuel efficiency is a form of thermal efficiency, meaning the ratio of effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work.

Which calorific value of fuel should be considered for calculating thermal efficiency?

Gross or higher calorific value – The amount of heat obtained by the complete combustion of 1 kg of fuel, when the products of its combustion are cooled down to the temperature of supplied air (Usually taken as 15 °C) is called gross or calorific value of the fuel.

What is the calorific value of fuel?

The calorific value is the measurement of heat value or amount of energy produced and is either measured in gross calorific value or net calorific value. Gross calorific value (GCV) or Higher Heating Value (HCV) is the amount of heat released by the complete combustion of a unit of fuel.

What is specific specific fuel consumption of an engine?

specific fuel consumption is a way of comparing different engine of different size on its efficiency. it is the ratio of fuel consumption per unit time to the power developed by engine. According to power produced it has two types 1) indicated specific fuel consumption and 2) brake fuel consumption.

What is the relationship between fuel economy and fuel consumption?

Because fuel economy and fuel consumption are reciprocal, each of the two metrics can be computed in a straight-forward manner if the other is known. In mathematical terms, if fuel economy is X and fuel consumption is Y, their relationship is expressed by XY = 1.

What is the formula for fuel consumption?

The fuel consumption rate is proportional to the horsepower (HP), so that: (11)dW f / dt = ˆcHP where c is the horsepower specific fuel consumption (hpsfc) with units of pounds per hour per horsepower.