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Question 1
Convert the complex number into polar form 6-j9.

Question 2
Find the value of impedance Z2 in the series circuit.

106_circuit.jpg

Question 3
Using KVL calculate the voltage across the resistance of 5Ω if it is in series with an inductance of 0.02H and connected across a 100 V, 40Hz supply.

1978_circuit1.jpg

Question 4
If a current of 70∠-25° mA passes through the impedance Z1 = 90∠40°Ω, find the current passed through the impedance Z2 = 35∠50°Ω using Cartesian co-ordinates.

978_circuit2.jpg

Question 5

Find the current passing through a branch whose impedance is Z = (7 + j7) when a voltage of V = 150V is applied.

Question 6

If the voltage V= 80V, 50Hlis applied across a coil of resistance of 10Ω and inductance of 30mH find the magnitude of the impedance.

Question 7
For the circuit shown below, find the value of VI.

1128_circuit3.jpg

Question 8
Calculate the impedance value (in phasor notation) for the following circuit (assume f = 1000Hz).

803_circuit4.jpg

Question 9
Calculate the impedance value (in phasor notation) for the following circuit (assume f = 1000Hz). Would this cicuit use more power at high or low frequencies?

803_circuit4.jpg

Question 10
A voltmeter placed across a 90 resistor reads 20V as shown in the figure below. Calculate the ammeter reading and the phase angle of the current I.

18_circuit5.jpg

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