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The mechanical paddles in a pinball machine are actuated by "solenoids", essentially electromagnets. These devices act like inductors as far as the circuits that must drive them are concerned. To activate a paddle, a current is applied via a mechanical switch to the solenoid, which drives the paddle; to return the paddle to its resting position, the current is removed (switch released). Since the solenoid appears inductive, it will resist this change in current, developing a potentially destructive voltage. The voltage can cause arcing between the switch contacts, leading to failure. To prevent this, a device is placed across the solenoid (inductor) that can hold the voltage to a safe value, say 40V, during transients. If the activating current in the solenoid is 1 amp and its inductance is 100uH, how long after the switch is turned off does it take for the current in the inductor to ramp down to zero? Where does the energy that was stored in the inductor go?
an amplifier has three amplification stages and a 1-dB attenuator in cascade. Assuming that all the impedances are properly matched, what is the overall gain if the amplification factors are 5, 10, and 6 dB
False positive and false negative rates can be adjusted, and they are often complementary: Lowering one raises the other. List two situations in which false negatives are significantly more serious than false positives.
What are two of the major considerations that factor in the design of a substation. Give a couple of examples of station layouts where these factors are clearly demonstrated. What typical grounding materials are used in substations.
calculate the minimum sampling interval (time period for counting the pulse train) to achieve a speed resolution of 5 rpm, and the number of bits that must be there in the binary counter if the pulse train is to be sampled with this interval for a..
Three identical constant pitch thin helical coils (having a pitch 3mm, axial length 450mm and inner diameter 20mm) are positioned along a common axis. The axial distance between the first and the second is 55mm
A glass tube with a cross-sectional area of 9^-2 m^2 contains an ionizd gas. The densities are 10^15 positive ions/m^ and 10^11 free electrons/m^3. Under the influence of an applied voltage, the postive ions are moving.
Design a circuit with output f and inputs x1, x0, y1, and y0. Let X=x1x0 and Y=y1y0 represent two 2-digit binary numbers. The output f should be 1 if the numbers represented by X and Y satisfies X>=Y
what is transmission velocity and how it is different from drit velocity. Drift velocity the actual (physical) velocity of electrons along the wire.
Draw the power supply current as a function of the input voltage for a CMOS inverter. What is the current when the input is at VOH. What transistor causes this. What is the current when the input is at VOL.
What is the smallest power of 2 needed to generate a binary codeword long enough for this message i.e. find N (= 2k) = What is the maximum number of binary digits that can be generated with this choice of N
A 50V DC source is connected in series with a switch, an 8.2k ohm resistor, and a 0.01 microfarad capacitor. There is no initial charge on the capacitor and the switch is open. Determine both A & B The time at which the capacitor is fully charged
1) Use the following function g(a,b,c) = (a'+b)(b'+c) for parts (a)-(d) below. a) write g as a minterm LIST b) write g as a canonical sum-of-products c) write g as a maxterm LIST d) write g as a canonical product-of-sums
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