1
Find the equivalent resistance of the circuit shown in Fig

2 M

2
Define RMS voltage.

2 M

3
What is reciprocity theorem?

2 M

4
Why do you short circuit the voltage source and open the current source when you find Thevenin's voltage of a Network?

2 M

5
Define quality factor in the resonant circuit.

2 M

6
Determine the quality factor of a coil for the series resonant circuit consisting of R=10 ohm, L=0.1h, and C=10 microfarad.

2 M

7
Distinguish between natural and forced response.

2 M

8
What is the time constant for RL and RC circuit?

2 M

9
Write the effect of power factor in energy consumption billing

2 M

10
Distinguish between unbalanced source and unbalanced load.

2 M

11 (a) (i)
Find the current I and voltage across 30 ? of the circuit shown in Fig. 11 (a) (i).

8 M

11 (a) (ii)
Determine the current in all the resistors of the circuit shown in Fig. 11 (a) (ii).

8 M

11 (b) (i)
Determine the current through each resistor in the circuit shown in Fig. 11(b) (i)

6 M

11 (b) (ii)
When a dc voltage is applied to a capacitor, voltage across its terminals is found to build up in accordance with v

(1) Find the value of capacitance in farad.

(2) How much energy stored in the electric field?

_{c}=50 (1-e^{-100t}). After 0.01 S the current flow is equal to 2 mA.(1) Find the value of capacitance in farad.

(2) How much energy stored in the electric field?

10 M

12 (a) (i)
Determine the current in the 5? resistor in the network shown in Fig. 12 (a) (i).

8 M

12 (a) (ii)
Find out the current in each branch of the circuit shown in Fig.12 (a) (ii)

8 M

12 (b) (i)
Determine current in each mesh of the circuit shown in Fig 12 (b) (i)

8 M

12 (b) (ii)
Determine the voltage at each node of the of the circuit shown in Fig. 12 (b) (ii)

8 M

13 (a)
For the circuit shown in Fig 13(a), determine the impedance at resonant frequency, 10 Hz above resonant frequency, and 10Hz below resonant frequency.

16 M

13 (b)
Explain that how to derive Q factor of parallel resonance.

16 M

14 (a)
A series RL circuit with R=30? and L=15H has a constant voltage V=60 v applied at t=0 as shown in Fig. 14(a). Determine the current i, the voltage across resistor and the voltage across the inductor.

16 M

14 (b)
The circuit shown in Fig. 14 (b) consists of resistance, inductance and capacitance in series with 100V DC when the switch is closed at t=0. Find the current transient.

16 M

15 (a) (i)
A symmetrical three-phase; three wire 440V supply to a star connected load. The impedance in each branch are Z

_{R}=2+j?, Z_{Y}=1-j2? and Z_{B}=3+j4?. Find its equivalent delta connected load.
8 M

15 (a) (ii)
A three phase, balanced delta-connected load 4+j? is connected across a 400V, 3? balanced supply. Determine the phase currents and line currents. (Phase sequence is RYB).

8 M

15 (b) (i)
A symmetrical three-phase, three 400V, supply to a star connected load. The impedance in each branch are Z

_{RY}=10?30? ?, Z_{YB}=10?45? ? and Z_{BR}=2.5?60? ?. Find its equivalent star-connected load.
8 M

15 (b) (ii)
A balanced star connected load having an impedance 15+j20? per phase is connected to 3?, 440V, 50Hz. Find the line current and power absorbed by the load.

8 M

More question papers from Circuit Theory