01․ A two port network is defined by the relation
The value of Z

_{11}isY

_{11}= 2, ΔY = -11; therefore, Z_{11}= Y_{11}/ΔY.02․ Which of the following statement is incorrect?

Voltage source can supply energy to other elements so it is an active element.

03․ Which of the following is not equivalent to watts?

Watt is the unit of power and ampere/volt is the unit of conductance.

04․ Three parallel resistive branches are connected across a DC supply. The ratio of the branch resistances are given as R

_{1}:R_{2}:R_{3}:: 2:4:6. The ratio of the branch currents isLet I

_{1}, I_{2}and I_{3}be the branch currents. Voltage drop across each branch is same. So, I_{1}R_{1}= I_{2}R_{2}= I_{3}R_{3}. R_{1}:R_{2}:R_{3}:: 2:4:6. If the common ratio is Z. Then R_{1}= 2Z, R_{2}= 4Z and R_{3}= 6Z. 2ZI_{1}= 4ZI_{2}= 6ZI_{3}; I_{1}/I_{2}= 2:1 and I_{2}/I_{3}= 3:2. So I_{1}:I_{2}:I_{3}:: 6:3:205․ Four resistances 80 Ohm, 50 Ohm, 25 Ohm and R are connected in parallel. Current through 25 Ohm resistance is 4A. Total current of supply is 10A. The value of R will be

Voltage drop across each parallel branch = 25×4 = 100V
Total current is 10A. So equivalent resistance is 10 Ohm
1/10 = 1/80+1/25+1/50+1/R
R = 36.36 Ohm

06․ The Norton equivalent of a network is given as I

_{N}= 4A and R_{N}= 2 Ohm. When this circuit is connected across a 2 Ohm load, the current through the load isThe connection diagram will be as shown in figure below
So current through load resistance of 2 Ohm will be 2×4/2 + 2 = 2A.

07․ A particular current is made up of two component : a 10 A and a sine wave of peak value 14.14 A. The average value of current is

Average DC current = 10 A.
Average AC current = 0 A as it is alternating in nature.
Average current = 10 + 0 = 10 A.

08․ Cells are connected in parallel in order to increase

The current capacity increases with the increase in number of cells connected in parallel.

09․ The arrangement of 12 cells each of internal resistance 1.5 Ohm to give maximum current in external load resistance of 2 Ohm will be

To give maximum current in external circuit, the internal resistance must be equal to the external resistance. If all the cells are connected in series, the internal resistance will be 18 Ohm. If all the cells are connected in parallel, the internal resistance will be 0.125 Ohm. So the cells must be connected in series – parallel combination. If S is the number of cells connected in series and P be the number of parallel rows, then equivalent resistance is S*1.5/P = 2 So S = 4 and P =3.

10․ A current is said to be alternating when it changes in

An alternating current changes in both magnitude and direction with time.

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