# A communication channel with additive white Gaussian noise, has a bandwidth of 4 kHz and an SNR of 15. Its channel capacity is

1.  1.6 kbps

2.  20 kbps

3.   32 kbps

4.  256 kbps

4

20 kbps

Explanation :
No Explanation available for this question

# The best approximation for Vc in the circuit shown in figure will be (assume β to be high)

1.  4V

2.  6.8V

3.  8.7V

4.  10.7V

4

10.7V

Explanation :
No Explanation available for this question

# The capacity of an analog communication channel with 4kHz band width and 15dB SNR is approximately

1.  20,000 bps

2.   16,000 bps

3.  10,000 bps

4.  8,000 bps

4

20,000 bps

Explanation :
No Explanation available for this question

# A system has a receiver noise resistance of 50Ω. If it is connected to an antenna with an output resistance of 50Ω, then noise figure of the system is

1.  1

2.  2

3.  50

4.  101

4

2

Explanation :
No Explanation available for this question

# If differential and common mode gains of a differential amplifier are 50 and 0.2 respectively, then CMRR will be

1.  100

2.  49.8

3.  8.7

4.  10.7

4

10.7

Explanation :
No Explanation available for this question

# If α=0.98, IC0=6μA and IE=100 μA for a transistor, then value of IC will be

1.  2.3mA

2.  3.1mA

3.  4.6mA

4.  5.2mA

4

5.2mA

Explanation :
No Explanation available for this question

# Given figure shows a silicon transistor connected as a common emitter amplifier. The quiescent collector voltage of the circuit is appropriately

1.  20/3V

2.  10V

3.  14V

4.  20V

4

14V

Explanation :
No Explanation available for this question

# A 8 kHz communication channel has an SNR of 30 dB. If channel bandwidth is doubled, keeping the signal power constant, then SNR for the modified channel will be

1.  27dB

2.  30 dB

3.  33 dB

4.  60 dB

4

27dB

Explanation :
No Explanation available for this question

# Consider the following statements regarding an RC phase shift oscillator 1. Amplifier gain is positive 2. Amplifier gain is negative 3. Phase shift introduced by the feedback network is 1800 4. Phase shift introduced by the feedback network is 3600 Of these statements

1.  1 and 3 are correct

2.  2 and 3 are correct

3.  2 and 4 are correct

4.  1 and 4 are correct

4

2 and 3 are correct

Explanation :
No Explanation available for this question

1.  4πx10-3V2

2.  2πx10-3V2

3.  4πx10-5V2

4.  πx10-3V2

4