Exercise :: Exam Questions Papers - Exam Paper 10
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1. | A lossless 50 Ω transmission line is terminated 30 + j25 Ω, then voltage reflection coefficient and current reflection coefficient are |
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Answer: Option D Explanation: Voltage reflection coefficient Current reflection coefficient : ri = - rv = + 10.36 ∠111.296. |
2. | Find value of i |
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Answer: Option C Explanation: The given circuit can be compared to a Wheatstone's Bridge. This bridge is balanced. ∴ Req = (10 + 10) || (20 + 20) = 20 || 40 = 13.33 Ω ∴ |
3. | The circuit shown in the figure has 4 boxes each described by inputs P, Q, R and outputs Y, Z with |
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Answer: Option B Explanation: Let P = 1101 Q = 1101 Yn = Pn ⊕ Qn ⊕ Rn Z = Rn Qn + Pn Rn + Qn Pn Constructing truth table So that, Rn + 1 = Zn 1 ≥ n ≥ 3 Z4 = R5(MSB) Hence, output is 00010 which show that it is a 4 bit subtractor giving P - Q. |
4. | Find the electric charge required on the earth and moon to balance their gravitational attraction if the charge on the earth is 12.5 times that on the moon. |
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Answer: Option C Explanation: Using law of gravitations, the force between two point masses is F = M1 = mass of moon = 6.7 x 1022 kg M2 = mass of earth = 6 x 1024 kg r = distance between masses = 380 km G = universal gravitational constant = 6.7 x 10- 11 Nm2/Kg2 Let Q1 and Q2 be the charge on moon and earth respectively. Now the gravitational force must be balanced by the force of repulsion. Q1Q2 = 4pε0M1M2G but Q2 = 12.5Q1
∴ Q2 = 6.11 x 1014 Q2 = 61.11 TC Q1 = 4.89 TC. |
5. | When x(n) is real then the Fourier series coefficients are correlated as __________ . |
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Answer: Option A Explanation: a-k = a*k for all values of k. In fact, this equality holds whenever x[n] is real. |