# In the circuit of the figure is the energy absorbed by the 4 Ω resistor in the time interval (0,∞) is

1.  36Joules

2.  16Joules

3.  256 Joules

4.  None of the above

4

None of the above

Explanation :
No Explanation available for this question

# In the circuit of the figure is the equivalent impedance seen across terminals a, b is

1.  (16/3)Ω

2.  (8/3)Ω

3.  [ (8/3)+12j]Ω

4.  None of the above

4

(8/3)Ω

Explanation :
No Explanation available for this question

# In the circuit of in the figure is the current  iD through the ideal diode (zero cut in voltage and forward resistance) equals

1.  0A

2.  4A

3.  1A

4.  None of the above

4

1A

Explanation :
No Explanation available for this question

# In the signal flow graph of the figure is y/x equals

1.  3

2.  5/2

3.  2

4.  none of the above

4

2

Explanation :
No Explanation available for this question

# A certain linear time invariant system has the state and the output equations given below

1.  1

2.  -1

3.  0

4.  none of these

4

-1

Explanation :
No Explanation available for this question

# A communication channel has first order low pass transfer function. The channel is used to transmit pulses at a symbol rate greater than the half-power frequency of the low pass function.Which of thenetwork shown in the figure is can be used to equalise the received pulse figure

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# The power spectral density of a deterministic signal is given by [sin (f)/f2 ] where f is frequency. Theautocorrelation (unction of this signal in the time domain is

1.  a rectangular pulse

2.  a delta function

3.  a sine pulse

4.  a triangular pulse

4

a rectangular pulse

Explanation :
No Explanation available for this question

# An amplifier A has 6 dB gain and 50Ω input and output impedances. The noise figure of this   amplifier as shown in the figure is (a) is 3 dB. A cascade of two such amplifiers as in the figure is will have a noise figure of

1.  6dB

2.  8dB

3.  12 dB

4.  none of the above

4

8dB

Explanation :
No Explanation available for this question

# parabolic dish antenna has a conical beam 20 wide, the directivity of the antenna is approximately

1.  20 dB

2.  30 dB

3.  40dB

4.  50dB

4

20 dB

Explanation :
No Explanation available for this question

# A very lossy, λ/4 long, 50Ω transmission line is open circuited al the load end. The input impedance    measured at the other end of the line is approximately

1.  0

2.  50Ω

3.  ∞

4.  none of the above

4