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Why the Circuit Power factor (Cos θ) Decreases, when Inductance (L) or inductive reactance (XL) increases, In inductive circuit? OR Explain the statement that  “  the Circuit Power factor   (Cos θ)  Decreases,  when Inductance (L) or inductive reactance (X L ) increases” Explanation:    Suppose,  when Inductance (L) = 0.02H V=220, R= 10 Ω,  L=0.02 H , f=50Hz. X L  = 2πfL = 2 x 3.1415 x 50 x 0.02 = 6.28 Ω Z = √ (R 2 +X L 2 ) = √ (10 2  + 6.28 2 ) = 11.8 Ω Cos θ = R/Z = 10/11.05 =   0.85 Now we increases Inductance (L) form 0.02 H to 0.04 H, V=220, R= 10 Ω,  L=0.04 H , f=50Hz. X L  = 2πfL= 2 x 3.1415 x 50 x 0.04 = 12.56 Ω Z = √ (R 2 +X L 2 ) = √ (10 2  + 12.56 2 ) = 16.05 Ω Cos θ = R/Z = 10/16.05 =  0.75 Conclusion : We can see that, When inductance (L) was 0.02, then circuit current were 18.64 A, and Circuit power factor was (Co...

Why we can’t store AC in Batteries instead of DC.or Can we store AC in batteries instead of DC? We  cannot store AC in batteries  because AC changes their polarity up to 50 (When frequency = 50 Hz) or 60 (When frequency = 60 Hz) times in a second. Therefore the battery terminals keep changing Positive (+ve) becomes Negative (-Ve) and vice versa, but the battery cannot change their terminals with the same speed so that’s why we can’t store AC in Batteries. in addition, when we  connect a battery with AC Supply , then It will charge during positive half cycle and discharge during negative half cycle, because the Positive (+ve) half cycle cancel the negative (-Ve) half cycle, so the  average voltage or current in a complete cycle is Zero . So there is no chance to store AC in the Batteries. If you want more books, slide, ppt's and notes,Request in the comment section. Visit the site for more knowledge and share this site link to the needy one....

      INTRODUCTION OF TRANSDUCERS  A transducer is a device that convert one form of energy to other form. It converts the measurand to a usable electrical signal.   In other word it is a device that is capable of converting the physical quantity into a proportional electrical quantity such as voltage or current. BLOCK DIAGRAM OF TRANSDUCERS • Transducer contains two parts that are closely related to each other i.e. the sensing element and transduction element.  • The sensing element is called as the sensor. It is device producing measurable response to change in physical conditions.  • The transduction element convert the sensor output to suitable electrical form. CHARACTERISTICS OF TRANSDUCERS 1. Ruggedness  2. Linearity  3. Repeatability  4. Accuracy  5. High stabilityand reliability  6. Speed of response  7. Sensitivity  8. Small size TRANSDUCERS SELECTION FACT...

Thermal Power Plants Thermal power plants use water as working fluid. Nuclear and coal based power plants fall under this category. The way energy from fuel gets transformed into electricity forms the working of a power plant. In a thermal power plant a steam turbine is rotated with help of high pressure and high temperature steam and this rotation is transferred to a generator to produce electricity. Fig.1 Power is produced in thermal power plants by rotating steam turbine Energy absorption from steam When turbine blades get rotated by high pressure high temperature steam, the steam loses its energy. This in turn will result in a low pressure and low temperature steam at the outlet of the turbine. Here steam is expanded till saturation point is reached. Since there is no heat addition or removal from the steam, ideally entropy of the steam remains same. This change is depicted in the following p-v and T-s diagrams. If we can bring this low pressure, low temperature st...