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          Fuel And Lubricants                          Fuel:         A Fuel is a substance that can be made to combine with oxygen with evolution of light and thermal energy that can be utilized for domestic as well as industrial heating.       Classification of Fuels: According to the physical state in which they exist in nature - solid, liquid and gaseous. According to the mode of their procurement- natural and manufactured.    Fuel------- (a) Natural Fuels                             (B) Manufactured Fuels    Natural Fuels:  (1) solid( wood,coal) (2) Liquid (petroleum). (3) Gas (Natural gas). Manufactured Fuels: (1) solid (coke, charcoal).   (2) Liquid ( coal tar, kerosene).     (3) Gas ( coal gas, producer gas)       ...

                        TRIGONOMETRY • Trigonometry  is a very important branch of mathematics. IT deals with the angles of a triangle and the measure of all sorts of positive and negative angles which falls within the perview of the subject. Measurement of Trigonometrical Angles: •systems of measuring Angles: 1.sexagesimal system (or English system): In this system,     1 right angle = 90 degrees (or 90°) 1 degree (or 1°) = 60 minutes (or 60') 1 miniute (Or 1') = 60 seconds (or 60°) 2. Centesimal system:   Radian: In any circle , the angle subtended at it's centre by an arc of the circle whose length is equal to the radius of the circle is called a radian.           Download pdf Click here👉 Trigonometrical Ratios formula