Textbook of Electrical Technology: Pt. 2: AC and DC Machines by B.L. Teraja, A.K. Teraja

By B.L. Teraja, A.K. Teraja

A textbook of electric expertise: quantity 2 ac and dc machines elaborately covers the themes, ac and dc machines, that's part of electric know-how. electric know-how, as an issue, covers a variety of divisions of electric engineering like simple electric engineering, electronics, keep an eye on structures, instrumentation and communique platforms. The e-book discusses and explains a number of theories concerning ac and dc machines. The chapters include quite a few workouts, examples, and a number of illustrations that reduction in figuring out the topic higher. This booklet is acceptable for college kids, and has been written in uncomplicated language. numerous solved examples assist in simplifying the subject material, and the illustrations make it visually extra enticing to scholars. the subjects coated within the publication variety from dc turbines and dc cars to alternators and synchronous cars. distinct value has been laid on chapters discussing cars. the target attempt part has additionally been rigorously revised to assist the readers larger. The twenty third revised version of a textbook of electric expertise: quantity 2 ac and dc machines was once released through s chand publishing in 2006. it's to be had in paperback. Key good points: this illustrated version offers complicated fabric in an built-in and rational series for b. E. , b. Tech. , and different comparable commencement classes.

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37 (a) shows how current through a varistor increase rapidly when the applied voltage increases beyond a certain amount (nearly 100 V in the present case). Fig. 37 There is a corresponding rapid decrease in resistance when the current increases. Hence, varistors are generally used to provide over-voltage protection in certain circuits. , its resistance decreases with increase in temperature as shown in Fig. 30 (b). Fig. 30 (c) shows how the resistance of an incandescent lamp increases with voltage whereas Fig.

Engg. Pune Univ. 5 Solution. 12. 767 Ω at 100°C. Find the resistance at 0°C and the temperature-coefficient of resistance at 40°C. ) Solution. 13. A potential difference of 250 V is applied to a field winding at 15°C and the current is 5 A. 91 A, applied voltage being constant. 5. (Elect. Engg. ) Solution. Let R1 = winding resistance at 15°C; R2 = winding resistance at unknown mean temperature t2°C. 94 Ω. 14. Two coils connected in series have resistances of 600 Ω and 300 Ω with tempt. coeff. 4% respectively at 20°C.

00352 In view of the dependence of α on the initial temperature, we may define the temperature coefficient of resistance at a given temperature as the charge in resistance per ohm per degree centigrade change in temperature from the given temperature. (iv) The above expression can be simplified by a little approximation as follows : R2 −1 = (1 + α0 t2) (1 + α0 t1) R1 = (1 + α0 t2) (1 − α0 t1) [Using Binomial Theorem for expansion and neglecting squares and higher powers of (α0 t1)] = 1 + α0 (t2 − t1) 2 ∴ R2 = R1 [1 + α0 (t2 − t1)] [Neglecting product (α0 t1t2)] For more accurate calculations, Eq.

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