# THE bit stream 01001 is differently encoded using ‘Delay and Ex OR’ scheme for DPSK transmission. Assuming a reference bit as ‘1’ and assigning phases of ‘0’ and π for’1’s and 0’s respectively, in the encoded sequence the transmitted phase sequence becomes

1.  π 0 π π 0

2.  0 π π 00

3.  0 π π π 0

4.  π π 0 π π

4
Correct Answer :

π π 0 π π

Explanation :
No Explanation available for this question

# V(t) = 5 (cos(106π t)-sin (103π t) × sin(106π t) represents

1.  DSB suppressed carrier signal

2.  AM signal

3.  SSB upper sideband signal

4.  Narrow band F. M. signal

4
Correct Answer :

Narrow band F. M. signal

Explanation :
No Explanation available for this question

# The current I through resistance r in the circuit shown below, is

1.  – V/12 R

2.  V/12 R

3.  V/6R

4.  V/3R

4
Correct Answer :

V/12 R

Explanation :
No Explanation available for this question

# The current I through resistance r in the circuit shown below, is

1.  – V/12 R

2.  V/12 R

3.  V/6R

4.  V/3R

4
Correct Answer :

V/12 R

Explanation :
No Explanation available for this question

# Increased pulse width in a flat-top sampling leads to

1.  Attenuation of high frequencies in reproduction

2.  Attenuation of low frequencies in reproduction

3.  greater aliasing error in reproduction

4.  no harmful effects in reproduction

4
Correct Answer :

Attenuation of high frequencies in reproduction

Explanation :
No Explanation available for this question

# A rectangle pulse of duration T is applied to a filter matched to this input. The output of the filter is a

1.  rectangular pulse of duration T

2.  rectangular pulse of duration 2T

3.  triangular pulse

4.  sine function

5.  22.8 kg

6.  28 kg

7.  25.6 kg

8.  26.5 kg

8
Correct Answer :

22.8 kg

Explanation :
No Explanation available for this question

# The image channel rejection in a super heterodyne receiver comes from

1.  IF stages only

2.  RF stages only

3.  detector and RF stages only

4.  detector, RF and IF stages

4
Correct Answer :

detector and RF stages only

Explanation :
No Explanation available for this question

# Assume transistor is in active region. If it has large β, VBE=0.7V. What will be the value of IC

1.  Cannot be calculated

2.  1mA

3.  5mA

4.  10mA

4
Correct Answer :

10mA

Explanation :
No Explanation available for this question

# Introducing resistor in the emitter of a common emitter amplifier stabilizes the DC operating point against variations in

1.  Only temperature

2.  Only β of transistor

3.  Both temperatures and β

4.  None of these

4
Correct Answer :

Both temperatures and β

Explanation :
No Explanation available for this question

# The npn transistor shown below has hfe=99 and VBE=0.7V. Under quiescent condition VEG=4.3V and IE1mA and the current in R2 is 0.1mA. The value of R1 required for biasing the circuit is

1.  10.1k

2.  90.9K

3.  100.1K

4.  150.2K

4
Correct Answer :

90.9K

Explanation :
No Explanation available for this question

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