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1. The LM7815 is used with an input voltage that can vary from 18 to 25 V. What is the maximum efficiency? The minimum efficiency?
2. A dc-to-dc converter has an input voltage of 5 V and an output voltage of 12 V. If the input current is 1 A and the output current is 0.25 A, what is the efficiency of the dc-to-dc converter?
In the truth table, use the don't care term to represent 1bit (or 2 bits) of the entries whose outputs are the same for thebit(s) is both 0 and 1. For example, for the F=11, X= 1110 andX=1111. Then X can be written as X=111×.
A liquid level system converts a 4-10 m level into a 4-20mA current. Design a three mode controller (PID im assuming) that outputs 0-5 volts with 50% PB, 0.03 min integration time, and 0.05 min derivative time.
In the operation of a refrigerator, does thermal energy flow from hot to cold, or is it from cold to hot? Why?
A pn junction may be formed by depositing a single crystal film of uniformly doped p-silicon onto a substrate that has been doped n-type. The substrate is 500um thick, and the film is 20um thick. The substrate has a 5 ohm-cm resistivity.
Determine parameter conditions under which this system admits a stable limit cycle. Validate your findings through simulation.
Write a program sequence that places the value in Address $1500 into Accumulator A. Then, AND this value with the value in Address $1501. Save the result in $1502.
the starting torque and line current if the motor is started with the stator starconnected. Assume that the stator and rotor copper losses are equal at standstill.
The transistor amplifier in Fig. P7.48 is biased with a current source Iand has a very high ß. Find the dc voltage at the collector, VC. Also, find the value of re. Replace the transistor with the T model of Fig. 7.26(b) (note that the dc current ..
A 23-kVA, 2300/230-V, 60-Hz, step-down transformer has the following resistance and leakage-reactance values: R1 = 4 ohm, R2 = 0.04 ohm, Xl = 12 ohm, and X2 = 0.12 ohm. The transformer is operating at 75% of its rated load.
i. Find the refractive index of the dielectric medium. ii. At what angle of incidence will the incident TM wave be totally refracted into air. iii. For a TE wave incident at the angle of incidence found in part (ii) above.
A generator (which may be represented by an emf in series with an inductive reactance) is rated 500MVA, 22kV. Its Y-connected windings have a reactance of 1.1 p.u. Find the ohmic value of the reactance of the windings.
A counter uses flip-flops which have a 5 ns delay between the time the clock input goes from 1 to 0 and the time the output is complemented.
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