A current sheet    A/m lies on the dielectric interface x=0 between two dielectric media with εr1=5, µr1=1 in Region -1 (x0). If the magnetic field in Region-1 at x=0- is  A/m the magnetic field in Region-2 at x=0+ is x>0 (Region-2) : εr2, µr2=2   x

1.  

2.  

3.  

4.  

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A transmission line of characteristic impedance 50W is terminated in a load impedance ZL. The VSWR of the line is measured as 5 and the first of the voltage maxima in the line is observed at a distance of λ/4 from the load. The value of ZL is

1.  10Ω

2.  250Ω

3.  (19.23 + j46.15)Ω

4.  (19.23 − j46.15)Ω

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4
Correct Answer :

10Ω


Explanation :
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X(t) is a stationary random process with autocorrelation function This process is passed through the system shown below. The power spectral density of the output process Y(t) is

1.  (4π2f2+1) exp (-πf2)

2.  (4π2f2-1) exp (-πf2)

3.  (4π2f2+1) exp (-πf)

4.  (4π2f2-1) exp (-πf)

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Correct Answer :

(4π2f2+1) exp (-πf2)


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The output of a 3-stage Johnson (twisted ring) counter is fed to a digital-to-analog (D/A) converter as shown in the figure below. Assume all the states of the counter to be unset initially. The waveform which represents the D/A converter output V0 is

1.  

2.  

3.  

4.  

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Two D flip-flops are connected as a synchronous counter that goes through the following QBQA sequence 00→11→01→10→00→…The combination to the inputs DA and DB are

1.  DA=QB; DB=QA

2.  

3.  

4.  

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Explanation :
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In the circuit shown below, for the MOS transistors, μnCOX=100μA/V2 and the threshold voltage VT=1V. The voltage VX at the source of the upper transistor is

1.  1V

2.  2V

3.  3V

4.  3.67V

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Correct Answer :

3V


Explanation :
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An input x (t) = exp (-2t)u(t) + d (t-6) is applied to an LTI system with impulse response h(t) = u(t) . The output is is

1.  [1-exp (-2t)]u(t) + u(t+6)

2.  [1-exp (-2t)] u(t) + u(t-6)

3.  0.5[1-exp(-2t)]u(t) + u(t+6)

4.  0.5[1-exp(-2t)]u(t) + u(t-6)

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4
Correct Answer :

0.5[1-exp(-2t)]u(t) + u(t-6)


Explanation :
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For a BJT the common base current gain a = 0.98 and the collector base junction reverse bias saturation current ICO = 0.6μA. This BJT is connected in the common emitter mode and operated in the active region with a base drive current IB=20μA. The collector current IC for this mode of operation is

1.  0.98mA

2.  0.99mA

3.  1.0mA

4.  1.01mA

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Correct Answer :

1.01mA


Explanation :
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If F(S)=L[f(t)]=[2(s+1)]/(s2+4s+7) then the initial and final values of f(t) are respectively

1.  0,2

2.  2,0

3.  0,2/7

4.  2/7,0

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Correct Answer :

2,0


Explanation :
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In the circuit shown below, the current I is equal to

1.  

2.  

3.  

4.  

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Explanation :
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