Exercise :: Exam Questions Papers - Exam Paper 1
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16. | Find 'X' in the circuit below : |
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Answer: Option C Explanation: f1(A, B, C, D) = ∑(6, 7, 13, 14) f2(A, B, C, D) = ∑(3, 6, 7) f1 ⊕ f2 = ∑(3, 13, 14) f3 x (f1 ⊕ f2) = ∑(14) = y X = f1 x y ⇒ ∑14. |
17. | Suppose that the modulating signal is m(t) = 2cos (2pfmt) and the carrier signal is xC(t) = AC cos(2pfct), which one of the following is a conventional AM signal without over modulation? |
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Answer: Option C Explanation: (C) is without over modulation. |
18. | What are the values of Emax and Emin displayed on the oscilloscope, when a 1 kV P-P carries is modulated to 50%? |
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Answer: Option C Explanation: Emax - Emin = 0.5 x 1 kV = 0.5 kV 2Emax = 1.5 kVi, Emax = 0.75 kV Emin = 0.25 kV. |
19. | Consider the common emitter amplifier shown below with the following circuit parameters: β = 100, gm = 0.3861 A/V, r0 = ∞ rp = 259 Ω, Rs = 1 kΩ, RB = 93 kΩ, RC = 250 Ω, RL = 1 kW, C1 = ∞ and C2 = 4.7mF. |
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Answer: Option B Explanation: Zs = Rs + (RB || Brs) rc = 2.475 = 1.258 kV |
20. | As the temperature increases the mobility of electrons __________ . |
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Answer: Option A Explanation: Mobility of electrons m = 2.5 for electrons and 2.7 for holes in Si. |