Question

Current b. Power .. Voltage Fogy The relative permy 9. of 0.0050 H T 3.97% 1930 None of the above is to 10. The basic function of power DC AC Сер AC to AC DC to DC All the shore None of the above 11. Which of the following does not change Frequency b. Current & Voltare d. All the above e. None of the above 12. In Synchronous Generator, the term field winding is applied A rotor stator separated exciti three pune curent ? 13. The friction losses in Real Transformers are a) 596 b) 25% c) 5096 d) Different from one transfer to e) None of the above the primary las a ge of 14. A single phase transformer with a ratio of 10:20, So, then the secondary will generate 100 C75 D None of the above

Answer 1

© Primary to A Trans for men transforms @voltage le voltage and current value changes from Secondary whereas, Power remains constant. 6 Given, H=50 and B = 255 . . Relative permeability (per) = ? B В-р кун 25 ,. | 9 KY -- 3 Е, на чтх (-7x So 2 347887•36 ( High) Hence Relative permeability of a ferromagnetic mate is very nigh. is V Ans - @ None of the above. ③ O @ The basic function of Power transformer is to transfer - © Ac to hea ice gt only steps up or steps down the AC input. Voltage to AC output. which of the following does not changes in transformes.. ~ @ frequency. go Transformer, Core is magnetized, Thus flux change will vary sinusoidally at a particular frequency . also, it works on mutual induction , due to this frequency is always kept constant.

② in synchronous Generator, field winding is applied to ② rotor. Because, supply is given to stator, hence rotating magnetica field is Produced, which interacts with the magnetic field Produced by field winding on the rotor. And hence, torque is produced and rotor rotates. ③ The frictional losses in Real Transformers are @ None of the above Because there is no ang rotating part in the transformers and hence, there will not be any frictional less.