The  diagonal  clipping  in  Amplitude  Demodulation  (using  envelope  detector)  can  be avoided  if  RC  time-constant  of  the  envelope  detector  satisfies  the  following  condition, (here W is message bandwidth and ωc is carrier frequency both in rad/sec)

1.  RC < 1/W

2.  RC > 1/W

3.  RC < 1/ωc

4.  RC > 1/ωc

View Answer  
4
Correct Answer :

RC < 1/W


Explanation :
No Explanation available for this question

In the following figure the minimum value of the constant 'C', which is to be added to y1 (t) such that y1 (t) and y2 (t) are different, is

1.  Δ

2.  Δ/2

3.  Δ2/12

4.  Δ/L

View Answer  
4
Correct Answer :

Δ2/12


Explanation :
No Explanation available for this question

A message signal with bandwidth 10 kHz  is Lower-Side Band SSB modulated with carrier frequency  fcl =  106  Hz.  The  resulting  signal  is  then  passed  through  a  Narrow-Band Frequency Modulator with carrier frequency fc2 = 109 Hz. The bandwidth of the output would be

1.  4 x 104 Hz

2.  2 x 106 Hz

3.  2 x 109 Hz

4.  2 x 1010 Hz

View Answer  
4
Correct Answer :

2 x 106 Hz


Explanation :
No Explanation available for this question

The circuit diagram of a standard TTL NOT gate is shown in the figure. When Vi = 2.5 V, the modes of operation of the transistor will be

1.  Q1: reverse active; Q2: normal active; Q3: saturation; Q4: cut-off;

2.  Q1: reverse active; Q2: saturation; Q3: saturation; Q4: cut-off;

3.  Q1: normal active; Q2: cut-off; Q3: cut-off; Q4: saturation;

4.  Q1: saturation; Q2: saturation; Q3: saturation; Q4: normal active;

View Answer  
4
Correct Answer :

Q1: reverse active;

Q2: saturation;

Q3: saturation;

Q4: cut-off;


Explanation :
No Explanation available for this question

In the following circuit, X is given by

1.  X=ABC+ABC+ABC+ABC

2.  

3.  X=AB+BC+AC

4.  

View Answer  
4
Correct Answer :

X=ABC+ABC+ABC+ABC


Explanation :
No Explanation available for this question

A medium is divided into regions I and II about x = 0 plane, as shown in the figure below.An electromagnetic wave with electric field E1 = 4âx + 3ây + 5âz is incident normally on the interface from region-I. The electric field E2 in region-II at the interface is

1.   E2 = E1

2.   4âx + 0.75ây - 1.25âz

3.   3âx + 3ây + 5âz

4.   - 3âx + 3ây + 5âz

View Answer  
4
Correct Answer :

3âx + 3ây + 5âz


Explanation :
No Explanation available for this question

When a plane wave  travelling  in  free-space  is  incident normally on a medium having  ε r =4.0, then fraction of power transmitted into the medium is given by

1.  8/9

2.  1/2

3.  1/3

4.  5/6

View Answer  
4
Correct Answer :

8/9


Explanation :
No Explanation available for this question

A  rectangular  waveguide  having  TEl0  mode  as  dominant  mode  is  having  a  cutoff frequency  of  18-GHz  for  the  TE30  mode.  The  inner  broad-wall  dimension  of  the rectangular waveguide is

1.  5/3 cms

2.  5 cms  

3.  5/2 cms

4.  10 cms

View Answer  
4
Correct Answer :

5/2 cms


Explanation :
No Explanation available for this question

A mast antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting  ground  plane.  It  is  base-fed  at  a  frequency  of  600-kHz.  The  radiation resistance of the antenna in ohms is

1.  2π2/5    

2.  π2/5

3.  4π2/5

4.    20 π2

View Answer  
4
Correct Answer :

2π2/5

   


Explanation :
No Explanation available for this question

Under the DC conditions, the collector-to-emitter voltage drop is

1.  4.8 Volts

2.  5.3 Volts

3.  6.0 Volts

4.  6.6 Volts

View Answer  
4
Correct Answer :

6.0 Volts


Explanation :
No Explanation available for this question
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