ECE :: Exam Questions Paper
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Calculate the electrostatic force of repulsion between two mica particles at a distance of 10-13 m from each other. Charge on a particle is 3.2 x 10-19 C. (relative permittivity for mica is 5)
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An electromechanical closed loop control system has the following characteristics equation :s3 + 6Ks2 + (K + 2)s = 8
where K is the forward gain of the system. The condition for closed loop stability is -
What is the propagation constant for air filled wave guide with dimensions a = 1.59" and b = 0.795" at 4.95 GHz. The wave impedance is
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An antenna array comprises of two dipoles that are separated by
wavelength. The dipoles are fed by currents of the same magnitude and 90° in phase. The array factor is: -
An air-filled rectangular waveguide has dimensions 8cm x 10cm . The wavelength of waveguide at frequency 3 GHz
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NMOS devices have __________ switching speeds and __________ on-state resistance; as compared with PMOS devices.
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What is the frequency of pulse at the points a, b, c in the circuit?
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A lossless transmission line with air dielectric is 6 m long. what is the phase constant?
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The impulse response h(t) of a linear invariant continuous time system is given by h(t) = exp (- 2t) u(t), where u(t) denotes the unit step function. The frequency response H(ω) of this system in terms of angular frequency ω is given by H(ω)
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= 
.
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= 1.5 GHz 
⇒ 1 MHz
= 7812.5 ∼ 7.8 kHz
.
e-2t e-jωt 