01․ Two resistors R

_{1}and R_{2}give combined resistance of 4.5 Ohm when connected in series and 1 Ohm when in parallel, the resistances areR

_{1}+ R_{2}= 4.5; R_{1}R_{2}/ (R_{1}+ R_{2}) = 1; R_{1}R_{2}= 4.5; Solving R_{1}= 3 and R_{2}= 1.5 .02․ Three resistors each R Ohm is connected to form a triangle. The equivalent resistance across any terminals is

R || (R+R)

03․ How many 200W / 220V bulbs connected in series across 220V supply will consume 100W?

When ‘n’ number of bulbs are connected in series, voltage across each lamp will be 220/n V as they are of same ratings. If voltage is reduced n times, the power consumed reduces by n

^{2}times. So, n×P/n^{2}= 100W. P = 200W. Therefore n = 2.04․ The terminals across the source are ___________ if a current source is to be neglected.

If a circuit is open no current will flow in the circuit.

05․ The terminals across the source are ___________ if a voltage source is to be neglected.

There will be no voltage drop across the terminals if they are short circuited.

06․ A load is connected to an active network. At the terminals to which the load is connected, R

_{TH}= 10 Ohm, V_{TH}= 60V. Then maximum power supplied to the load isMaximum power transferred is given by V

_{TH}^{2}/4R_{TH}.07․ The maximum power that can be transferred to the load resistor R from the voltage source in the figure is

Maximum power is transferred when R = 2 Ohm and the value of maximum power is 3

_{2}/(4×2) = 9/8W.08․ A two port network is defined by the relation
The value of Z

_{12}isY

_{12}= 3, ΔY = -41; therefore, Z_{21}= -Y_{12}/ΔY.09․ Find the Z parameters of the circuit shown in figure.

Applying KVL in the left hand side loop,

10․ Condition for reciprocity in case of ABCD parameters is

A two port network is reciprocal if AD – BC = 1.

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