The voltage applied to a circuit is volts and the circuit draws
a current of amperes. Taking the voltage as the
reference phasor, the phasor representation of the current in amperes is

**A. **

**B. **

**C. **

**D. **

**Answer : ****Option B**

**Explaination / Solution: **

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R_{A} and R_{B} are the input resistances of circuits as shown below. The circuits extend infinitely in the
direction shown. Which one of the following statements is TRUE?

**A. ** R_{A }= R_{B}

**B. ** RA = RB = 0

**C. ** RA < RB

**D. ** RB = RA/(1+RA)

**Answer : ****Option D**

**Explaination / Solution: **

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The input voltage given to a converter is

**A. ** 181W

**B. ** 500W

**C. ** 707W

**D. ** 887W

**Answer : ****Option B**

**Explaination / Solution: **

The current drawn by the converter is

The active power drawn by the converter is

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For maximum power transfer between two cascaded sections of an electrical
network, the relationship between the output impedance Z_{1} of the first section
to the input impedance Z_{2} of the second section is

**A. ** Z_{2} = Z_{1}

**B. ** Z_{2} = -Z_{1}

**C. **
**D. **
**Answer : ****Option C**

**Explaination / Solution: **

Consider the cascaded network shown below

Z_{2} = Z_{1}^{*}

Z_{2} = -Z_{1}^{*}

Consider the cascaded network shown below

Since, the output impedance of system 1 is Z_{1} and input impedance of system 2
is Z_{2}. So, we have the equivalent circuit is

Now, we consider a circuit with internal impedance Z_{in} and load impedance Z_{L}

For maximum power transfer, the condition is

Z_{in}^{* }= Z_{2}

Comparing this condition to cascaded system, we have the required condition for
maximum power transfer as

Z_{1}^{* }= Z_{2}

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The impedance looking into nodes 1 and 2 in the given circuit is

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In the following figure, C_{1} and C2 are ideal capacitors. C1 has been charged to 12 V before the ideal
switch S is closed at t = 0. The current i(t) for all t is

**A. ** zero

**B. ** a step function

**C. ** an exponentially decaying function

**D. ** an impulse function

**Answer : ****Option D**

**Explaination / Solution: **

Time constant = RC In the given circuit, R = 0 Rise time = 0; hence capacitor charges instantaneously and the current can be represented as impulse function

Time constant = RC In the given circuit, R = 0 Rise time = 0; hence capacitor charges instantaneously and the current can be represented as impulse function

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Two passive two-port networks are connected in cascade as shown in figure. A voltage source is
connected at port 1.

_{2} = C_{2}V_{3}
+ D_{2}I_{3}**A. **

**B. **

**C. **

**D. **

**Answer : ****Option D**

**Explaination / Solution: **

Given V_{1} = A_{1}V_{2} + B_{1}I_{2}

I_{1} = C_{1}V_{2} + D_{1}I_{2}

V_{2} = A_{2}V_{3} + B_{2}I_{3}

A1 ,B1 ,C1 ,D1 ,A2 ,B2 ,C2 and D2 are the generalized circuit constants. If the Thevenin equivalent
circuit at port 3 consists of a voltage source VT and impedance ZT connected in series, then

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Consider a delta connection of resistors and its equivalent star connection as shown below. If all elements of the delta connection are scaled by a factor k, k>0, the elements of the corresponding star equivalent will be scaled by a factor of

No Explaination.

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The switch in the circuit has been closed for a long time. It is opened at t = 0. At t = 0^{+},
the current through the 1µF capacitor is

**A. ** 0A

**B. ** 1A

**C. ** 1.25A

**D. ** 5A

**Answer : ****Option B**

**Explaination / Solution: **

No Explaination.

No Explaination.

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If the electrical circuit of figure (b) is an equivalent of the coupled tank system of figure (a), then

No Explaination.

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