# 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

4

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

4

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

4

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;

4

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.

4

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

4

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

4

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

4

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

4

2/5

Explanation :
No Explanation available for this question

1.  4.8 Volts

2.  5.3 Volts

3.  6.0 Volts

4.  6.6 Volts

4