Graded Exercises in Electrical and Electronic Engineering by Christopher R. Robertson

By Christopher R. Robertson

This publication is designed to enrich the 2 volumes electric and digital rules 1 and a pair of. as a result of the graded nature of the task questions, lots of them are really challenging, and should as a result even be stumbled on of use for better nationwide, first-year undergraduate reports in electric engineering, and linked bridging classes. Of necessity, the project questions on the finish of every bankruptcy of so much textbooks are inclined to focus completely at the subject coated through the appropriate bankruptcy. despite the fact that, this has a tendency to fragment the subject material. hence the coed, as soon as verified, has a tendency to 'forget' approximately previous issues and concentrates exclusively at the present subject of analysis. This impact is compounded through the present approach of section checks and assignments rather than a accomplished finish attempt on of completion of the unit of analysis. the target of this booklet is to offer extra lifelike engineering difficulties. in lots of instances which means the scholar has to utilise wisdom received over a number of themes which will arrive at an answer. this may support the scholar to view the unite s) as a cohesive complete, instead of remoted wallet of information. to be able to improve the integrative element, a few routines contain subject matters from the BTEC Electronics syllabuses including a few components from purposes. the subject material of this final unit has enormous overlap with that of electric and digital Principles.

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Up fiat mild steel plates, having a mass of 250 kg and cross-sectional area 40 cm2• Due to surface irregularities there is an effective air-gap between the pole faces and the plate of 3 mm at each pole face. The mean magnetic path length through the magnet is 500 mm, whilst that for the plate is 200 cm. The arrangement is illustrated in Fig. 11. 4, and that for the mild steel plate may be obtained from Fig. 1. Calculate the current required for the 250-turn coil, wound around the central limb of the electromagnet, in order to lift one plate.

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13 An amplifier has a power gain of 60 dB, and an input resistance of 75 n. d. across the load when an input of 10 m V is applied. 14 An amplifier has a voltage gain factor of 64, its input and output impedances are non-reactive and have values of 200 n and 600 n respectively. A transmission line connected to the amplifier output has a power loss of -10 dB. Express the amplifier power gain in dB and hence determine the overall power gain of the complete system, measured in decibels. c. 5 H inductor by the use of a two-position switch as shown in Fig.

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