Consider the signal flow graph shown in figure below. The gain is : P1 = abcd L1

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Question
Consider the signal flow graph shown in figure below. The gain is :
Options
A.
B.
C.
D.

Correct Answer

Explanation

P₁ = abcd

L₁ = be, L₂ = cf, L₃ = dg

?₁ = 1

Consider the signal flow graph shown in figure below. The gain is : P1 = abcd L1 = be, L2 = cf, L3 =

Consider the signal flow graph shown in figure below. The gain is : P1 = abcd L1 = be, L2 = cf, L3 = .

Exam Questions Papers problems

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1. The antenna current of an AM transmitter is 8 A, when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by a single sine wave. Determine the antenna current when the percent of modulation changes to 0.8
Options
A. 9.19 A
B. 9.91 A
C. 10.56 A
D. 8.61 A

2. The gradient of any scalar field always yields __________ .
Options
A. a solenoidal field
B. a conservative field
C. an irrotational field
D. none of these

3. Find 'X' in the circuit below :

f₁(A, B, C, D) = ?(6, 7, 13, 14);
f₂(A, B, C, D) = ?(3, 6, 7);
f₃(A, B, C, D) = ?(5, 6, 7, 14, 15)
Options
A. p(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
B. 0
C. ?(14)
D. 1

4. Consider the probability density f(x) = ae^-b|x| where x is a random variable whose allowable values range from x = - ? to x = + ?. P(1 ? x ? 2)
Options
A.
B.
C.
D. (e^-b - e^-2b)

5. A radar receiver has a noise figure of 10 dB at 300 K having a bandwidth of 2.5 MHz. The minimum power it can receive is
Options
A. 3.45 x 10^-15 W
B. 1.38 x 10^-15 W
C. 7.5 x 10^-15 W
D. 93.15 x 10^-15 W

6. In the following non planar graph number of independent loop equations are
Options
A. 8
B. 12
C. 7
D. 5

7. The amplifier circuit shown below uses a silicon transistor. The capacitors C_c and C_E can be assumed to be short at signal frequency and the effect of output resistance r₀ can be ignored. If C_E is disconnected from the circuit, which one of the following statements is TRUE?
Options
A. The input resistance R_i increases and the magnitude of voltage gain A_v decreases
B. The input resistance R_i decreases and the magnitude of voltage gain A_v decreases
C. Both input resistance R_i and the magnitude of voltage gain A_v decrease
D. Both input resistance R_i and the magnitude of voltage gain A_v increase

8. Consider the amplitude modulated (AM) signal A_c cos ?_ct + 2 cos ?_mt cos ?_ct For demodulating the signal using envelope detector, the minimum value of A_c should be
Options
A. 2
B. 1
C. 0.5
D. 0

9. A unity-feedback control system has the open loop transfer function . If the input system is a unit ramp, the steady state error will be
Options
A. 0
B. 0.5
C. 2
D. infinity

10. A certain 8 bit uniform quantization PCM system can accommodate a signal ranging from - 1 V to + V. The rms value of the signal is V . The signal to quantization noise ratio is:
Options
A. 30 dB
B. 46.91 dB
C. 40 dB
D. 49.92 dB

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