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Write the sinusoidal expressions for voltages and currents having the following rms values at a frequency of 60 Hz with zero phase shift:
a. 1.414 V
b. 70.7 V
c. 0.06 A
d. 24 µA
At some instant, it goes into regenerative braking. Calculate the armature voltage va at that instant, if the current ia is not to exceed 10A in magnitude. Assume that the inertia is large and thus the speed changes very slowly.
The Bandwidth of a broadband signal is 6 MHz and it's maximum frequency is 106Mhz. What is the most likely carrier frequency. WHich of the follwing is not a fundamental characteristics determines the effectiveness of a communication system.
A long copper wire of circular cross-section and resistance 0.05 O has a potential difference of 0.10 V applied across its ends. The wire is then melted and reformed into a wire of circular cross-section that is twice as long.
Figure 7.138 shows a circuit for setting the length of time voltage is applied to the electrodes of a welding machine. The time is taken as how long it takes the capacitor to charge from 0 to 8 V. What is the time range covered by the variable res..
The loop transfer function of a single-loop negative feedback system is: L(s) = Gc(s)G(s) = K(s + 2.5)(s + 3.2) / (s2(s + 1)(s + 10)(s + 30)) This system is called conditionally stable because it is stable only for a range of the gain K
The odd cycle sequences1,3,5,7, and repeats. An external input selects which cycle to perform. An input of 0 selects the even cycle and an input of 1selects the odd cycle. The cycles can be entered and exited throughstates 0 and 1.
Dunne, Roberts, and Samuelson examined manufacturing industries in the 1960s to 1980s. Do you think that technological changes since that time will have affected entry and exit patterns? What industries are most likely to have been affected?
Compare the method of operation of each of the following types of switches:
Design an assembly code to open a vault (after entering the correct 4-number sequence "1234"), it displays it in the 7 segment display, than it displays the word OPEN when the correct sequence is entered.
An analog line concentrator resides logically between the line circuits and the line side of a switching fabric. One might be placed physically at the distribution point in the loop architecture or, even at the pedestal- in which case, the line ci..
Determine the conductor size for each motor tap, the motor controller size, overload rating, motor and controller disconnect rating, time-delay fuse rating, and motor branch circuit conductor size.
In a simple model of the hydrogen atom an electron has a circular orbit of radius 5.0 x 10-11 m around a stationary proton.(a) the magnitude of the electrical force exerted by the proton on the electron, (b) the speed of the electron in its motion ar..
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