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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...

Induction Motor | Working Principle | Types of Induction Motor One of the most common electrical motor used in most applications which is known as  induction motor . This motor is also called as asynchronous motor because it runs at a speed less than its synchronous speed. Here we need to define what is synchronous speed. Synchronous speed is the speed of rotation of the magnetic field in a rotary machine and it depends upon the frequency and number poles of the machine. An  induction motor  always runs at a speed less than synchronous speed because the rotating magnetic field which is produced in the stator will generate flux in the rotor which will make the rotor to rotate, but due to the lagging of flux current in the rotor with flux current in the stator, the rotor will never reach to its rotating magnetic field speed i.e. the synchronous speed. There are basically two  types of induction motor ...