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

A textbook of electric know-how: quantity 2 ac and dc machines elaborately covers the themes, ac and dc machines, that's part of electric know-how. electric expertise, as a topic, covers numerous divisions of electric engineering like simple electric engineering, electronics, keep watch over structures, instrumentation and communique platforms. The booklet discusses and explains a variety of theories relating to ac and dc machines. The chapters encompass quite a few routines, examples, and a number of illustrations that relief in figuring out the topic larger. This booklet is appropriate for college kids, and has been written in easy language. quite a few solved examples assist in simplifying the subject material, and the illustrations make it visually extra attractive to scholars. the subjects coated within the e-book variety from dc turbines and dc automobiles to alternators and synchronous vehicles. distinct significance has been laid on chapters discussing cars. the target try out part has additionally been conscientiously revised to assist the readers higher. The twenty third revised version of a textbook of electric expertise: quantity 2 ac and dc machines used to be released through s chand publishing in 2006. it truly is on hand in paperback. Key good points: this illustrated variation offers complicated fabric in an built-in and rational series for b. E. , b. Tech. , and different similar commencement classes.

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**Example text**

The unit of conductance is siemens (S). Earlier, this unit was called mho. It is seen from the above equation that the conductivity of a material is given by G siemens × l metre σ = G l = = G l siemens/metre 2 A A A metre Hence, the unit of conductivity is siemens/metre (S/m). 9. Effect of Temperature on Resistance The effect of rise in temperature is : (i) to increase the resistance of pure metals. The increase is large and fairly regular for normal ranges of temperature. The temperature/resistance graph is a straight line (Fig.

Fig. 12 Fig. 13 ∴ V = V1 + V2 + V3 = IR1 + IR2 + IR3 But V = IR where R is the equivalent resistance of the series combination. ∴ IR = IR1 + IR2 + IR3 or R = R1 + R2 + R3 1 + 1 + 1 1 Also = G G2 G3 G 1 As seen from above, the main characteristics of a series circuit are : 1. same current flows through all parts of the circuit. 2. different resistors have their individual voltage drops. 3. voltage drops are additive. 4. applied voltage equals the sum of different voltage drops. 5. resistances are additive.

The resistivity of a ferric-chromium-aluminium alloy is 51 × 10 Ω-m. 014 cm thick. Determine resistance between (a) opposite ends and (b) opposite sides. ) Solution. (a) As seen from Fig. 1 × 10 3 Ω (b) As seen from Fig. 3 × 10 10 Ω Fig. 10. The resistance of the wire used for telephone is 35 Ω per kilometre when the −8 weight of the wire is 5 kg per kilometre. 95 × 10 Ω-m, what is the cross-sectional area of the wire ? What will be the resistance of a loop to a subscriber 8 km from the exchange if wire of the same material but weighing 20 kg per kilometre is used ?