The number of bits in a binary PCM system is increased from n to n+1.As a result ,the signal to quantization noise ratio will improve by a factor

1.  (n+1)/n

2.  2 (n+1)/n

3.  22(n+1)/n

4.  which in independent of n

View Answer  
4
Correct Answer :

22(n+1)/n


Explanation :
No Explanation available for this question

The autocorrelation function of an energy signal has

1.  no symmetry

2.  conjugate symmetry

3.  odd symmetry

4.  even symmetry

View Answer  
4
Correct Answer :

even symmetry


Explanation :
No Explanation available for this question

An FM signal with a modulation index 9 is applied to a frequency tripler.The modulation index in the output signal will be  

1.  0

2.   3

3.  9

4.  27

View Answer  
4
Correct Answer :

27


Explanation :
No Explanation available for this question

The critical frequency of an ionospheric layer is 10 MHz.What is the maximum launching angle from the horizon for which 20MHz wave will be reflected by the layer

1.  00

2.  300

3.  450

4.  900

View Answer  
4
Correct Answer :

300


Explanation :
No Explanation available for this question

A 1 km long microwave link uses two antennas each having 30dB gain.If the power transmitted by one antenna is 1 W at 3GHz,the power received by the other antenna is approximately

1.  98.6 μW

2.  76.8μW

3.  63.4μW

4.  55.2μW

View Answer  
4
Correct Answer :

63.4μW


Explanation :
No Explanation available for this question

Some unknown material has a conductivity of 106 mho/m and a permeability of 4πx10-7 H/m.The skin depth for the material at 1 GHz is

1.  15.9 μm

2.  20.9μm

3.  25.9μm

4.  30.9μm

View Answer  
4
Correct Answer :

15.9 μm


Explanation :
No Explanation available for this question

The Laplace transform of a unit ramp function starting at t=a,is

1.  1/(s+a)2

2.  e-as/(s+a)2 

3.  e-as/s2

4.  a/s2

View Answer  
4
Correct Answer :

e-as/s2


Explanation :
No Explanation available for this question

The Fourice Series of a odd periodic function, contains only

1.  odd harmonics

2.  even harmonics

3.  cosine terms

4.  sine terms

View Answer  
4
Correct Answer :

sine terms


Explanation :
No Explanation available for this question

A series LCR circuit consisting of R=10Ω,|XL| =20Ω and |XC| =20Ω,is connected across an a.c.supply of 200V     rms.The rms voltage across the capacitor is 

1.   200-900V

2.  200?+900V

3.  400?-900V

4.  400?+900V

View Answer  
4
Correct Answer :

400?+900V


Explanation :
No Explanation available for this question

A ramp voltage ,v(t)=100 volts,is applied to an RC differentiating circuit with R=5kΩ and C=4μF.The maximum  output voltage is

1.  0.2 volts

2.  2.0 volts

3.  10.0 volts

4.  50.0 volts

View Answer  
4
Correct Answer :

2.0 volts


Explanation :
No Explanation available for this question
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