Exercise :: Exam Questions Papers - Exam Paper 8
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1. | Px(X) = M exp(- 2 |x|) + N exp(- 3 |x|) is the probability density function for the real random variable X, over the entire x axis. M and N are both positive real numbers. The equation relating M and N is |
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Answer: Option A Explanation: Using property of probability density of
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2. | The electric field component of a time harmonic plane EM wave travelling in a non magnetic lossless dielectric medium has an amplitude of 1 V/m. If the relative permittivity of the medium is 4, the magnitude of the time-average power density vector (in W/m2) is |
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Answer: Option C Explanation: |
3. | The open loop transfer function of a unity feedback control system is given as |
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Answer: Option A Explanation: At phase cross over frequency
-90° - tan- 1 ωT1 - tan- 1 ωcT2 = - p
GM = 1/a where a = | G(jω)|ω=ωc
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4. | A unity negative feedback closed loop system has a plant with the transfer function |
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Answer: Option D Explanation: so, Gc(s)|s → 0 should be maximum for low error = ∞ Gc(s)|s → 0. |
5. | Find current i. |
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Answer: Option A Explanation: The given circuit can be compared with Wheatstone's Bridge ∴Req = (10 + 10 + 10) || (10 + 10 + 10) = 30 || 30 = 15 Ω
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