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Ece 152: Electrical Engineering Materials Question Paper

Ece 152: Electrical Engineering Materials 

Course:Bachelor Of Engineering In Electrical And Telecommunication Engineering

Institution: Moi University question papers

Exam Year:2008



ECE 152: ELECTRICAL ENGINEERING MATERIALS

1. What is the reluctance of a magnetic circuit in which a total flux of 0.002 Wb is set up by a 5-A current flowing in a solenoid consisting of 200 turns of wire?

2. What current must be passed through a 500-turn solenoid to produce a total flux of 1.2mWb in a magnetic circuit whose reluctance is 2x10^6 At/Wb?

3. The core of a solenoid consists of a brass cylinder 10 cm in length and 2 cm in diameter. What is its reluctance?

4. How many turns of wire are there in a solenoid if a 500 mA current through it produces a total flux of 8 x 10^-4 Wb in a magnetic circuit whose reluctance is 5 x 10^5 At/Wb?

5. A piece of iron 10 cm in length and having a rectangular cross section of 1 x 2 cm has a reluctance of 1.25 x 10^6 At/Wb. What is the permeability of the iron?

6. A magnetic field intensity of 2000 At/m produces a flux density of 1.0 T in a certain type of iron. What is its permeability at this flux density?




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