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Ece 112: Circuit Theory Question Paper

Ece 112: Circuit Theory

Course:Bachelor Of Engineering In Electrical And Telecommunications Engineering

Institution: Moi University question papers

Exam Year:2009

ECE 112: CIRCUIT THEORY

1. How long after the switch is closed will it take the current to reach its maximum value in a circuit whose resistance is 8 ohms and whose inductance is 2.4 H?

2. What is the resistance of a solenoid whose inductance is 4 H if it takes 0.2 s for the current to reach its maximum value?

3. What voltage must be applied to an 0.08 mH inductor if the initial rate of change of current is to be 10000 A/s?

4. A 120-mH inductor has a resistance of 6 ohms. The initial rate of rise of current is 1000 A/s. What is the final current?

5. A choke with an inductance of 20 H and a resistance of 16 ohms is connected through a switch to a 24 volts source.
a. What is the initial current when the switch is closed?
b. What is the initial rate of change of cure when the switch is closed?
c. What is the final steady-state current?
d. How long does it take the current to reach its maximum value?

6. An inductor has an inductance of 20 H and a resistance of 500 ohms. In parallel with this coil is a 1000 ohm resistor. This combination is connected across a 120 volt dc source whose internal resistance is negligible.
a. What initial current is drawn from the source when the switch is closed?
b. What is the initial change of current in the coil?
c. What is the steady-current in the coil?
d. How long does it take the current to reach its steady-state value?

Ece 112: Circuit Theory Question Paper

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