Exercise :: Exam Questions Papers - Exam Paper 7
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| 1. | In the signal flow graph of figure below, the gain C/R will be : |
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Answer: Option D Explanation: Forward path gain P1 = 2 x 3 x 4 ⇒ 24, P2 = 5, D1 = 1 D2 = - 3, L1 = - 2, L2 = - 3, L3 = - 4
Two non touching loop = L1 x L3 = - 2 x - 4 = 8 But if we take loop L4 into consideration then = 5 x -1 x - 1 x - 1 = -5
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.| 2. | The resonant frequency of the circuit shown in figure is, |
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Answer: Option C Explanation: Leq = L1 + L2 + 2M Leq = 1 + 2 + 2 x ∴ |
= 4 H
.| 3. | A short grounded vertical antenna has a length L which is 0.05λ at frequency f. If its radiation resistance at f is R ohms, then its radiation resistance at a frequency 2f will be |
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Answer: Option D Explanation: Rr = 80p2 ∴ Rr ∝ f2. |
| 4. | Which of the following is a solution to the differential equation |
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Answer: Option B Explanation:
log x(t) = 3t x(t) = K.e-3t Thus option (B) satisfies the solution. |
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| 5. | In the circuit shown, the device connected to Y5 can have address in the range |
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Answer: Option B Explanation:
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