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Circuit Theory Question Paper

Circuit Theory

Course:Bachelor Of Electrical And Electronics Engineering

Institution: Moi University question papers

Exam Year:2010

CIRCUIT THEORY
REVIEW QUESTIONS

1. Current changing at the rate of 200 mA/s in an inductor induces in it a voltage of 50 mV. What is its inductance?

2. What inductunce must the collector load of a transistor have if collector current rising at a uniform rate from 2 mA in 0.05ms induces in it a voltage of 20 mV?

3. What voltage will be induced into a 10-H inductor in which the current changes from 10 A to 7 A in 90ms?

4. How long will it take the current in a 2-H inductor to rise from zero to 6 A if the voltage induced into the inductor is constant at 3 V?

5. If we can assume no leakage flux, what is the approximate inductance of an air-core coil of 20 turns with an inside diameter of 2 cm and a length of 2 cm?

6. How many turns must we wind on an air-core coil 3 cm long and 3 cm in diameter to obtain an inductance of 0.02mH?

7. A 2-H inductor has 1200 turns. How many turns must we add to raise its inductance to 3 H?

8. A 500-mH inductor has 750 turns. Where must we place a tap to obtain an inductance of 250 mH between the end and the tap? What inductance is available if we use the other end and the tap?

9. Three inductors whose inductances are 30 mH, 40 mH, and 50 mH, respectively, are located so that there is no mutual induction between them. What is the effective inductance when the three coils are connected
a. In series and
b. In parallel?

10. What inductance must be placed in parallel with an inductance of 0.06 mH to reduce the net inductance to 0.015 mH?

Circuit Theory Question Paper

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