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Suppose a certain causal signal f(t) has a Laplace transform F(s) = 1. If f(t) is sampled at times kT where T is a constant time interval and integer k>=0, what are the sample values?
What are the techniques used to make feedback system stable? Explain and draw the frequency response of a 1-pole feedback amplifier.
If you were the operator for an squirrel cage induction machine, what options could you consider to control speed Describe and mention pluses and minuses of each.
Each equation above describes a field that is distributed sinusoidally and whose amplitude varies sinusoidally with time (a pulsating field). Prove for the resultant magnetic flux density in the air gap (a) at any given t
Calculate the extraction efficiency (in percentage) of flat - surface LED without any encapsulation (emits directly into the air). The LED is fabricated from material with the refractive index n = 2.3.
Determine the standing wave pattern for the voltage in the line. Express the result in real insantaneous form and simplify
Suppose L=25mH, but the resistance value,R, is not specified. Find a condition on R so that the circuit is strictly BIBO unstable (i.e., not even marginally stable). Hint: you might not be able to purchase such a resistor at Radio Shack
An SSB generator has a 9 MHz carrier and is used to pass voice frequencies in the 300- to 3300-Hz range. The lower sideband is selected. What is the approximate center frequency of the filter needed to pass the lower sideband.
Capacitance can be altered by immersing part of the two wire line into a different medium. (a) What is the capaccitance per unit length in F/m of the transmission lines. You must explain your reasoning and show the equation you used.
A 345-kV, 3-phase transmission line delivers 100 MVA, 0.866 lagging, to a DELTA connected load. Calculate the following: a.) The total real and reactive power delivered to the load. b.) The real and reactive power per phase.
For the feedback voltage amplifier let the op amp have an infinite input resistance, a zero output resistance, and a finite open-loop gain A = 10^4 V/V. If R1 = 1 kOhms, find the value of R2 that results in a closed-loop gain of 100 V/V.
Suppose that the sequence 110010011 is used as a synchronization sequence preamble to a data packet. Propose a method that can be used to allow the channel to distinguish the synchronization sequence from an identical data sequence within the pack..
A "Hall bar" specimen is 250 mm long, 12 mm wide, and 1.5 mm thick. Along the 250 mm direction (+x), +5 V drives a current of +1.75 mA. Along the 1.5 mm direction (+z) a magnetic field of 1 Tesla is applied.
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