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A vertical array of circuit boards of 150-mm height is to be air cooled such that the board temperature does not exceed 60°C when the ambient temperature is 25°C.
Assuming isothermal surface conditions, determine the allowable electrical power dissipation per board for the cooling arrangements:
(a) Free convection only (no forced airflow).
(b) Airflow with a downward velocity of 0.6 m/s.
(c) Airflow with an upward velocity of 0.3 m/s.
(d) Airflow with a velocity (upward or downward) of 5 m/s.
Find the primary voltage and voltage regulation when the transformer is operating at full load 0.8 power factor lagging and 240 V. Find the primary voltage and voltage regulation when the transformer is operating at full load 0.8 power factor leadin..
What is the conclusion that can be made for linear,square-shapedcells and frequency reuse factors C=3 and C=4 interms of theirSIR(Signal-interference ratio).
Write a C-Program that tells whether or not there are repeated cards amoung a 2-d array[4][13]. It returns "true" if it does. The program needs a function to determine whether or not it has repeated cards.
Consider the Norton equivalent circuit with respect to terminals 'a' and 'b' for the circuit shown below. Suppose that Ro is given as 10 . The Norton equivalent current must be zero because there are no independent sources.
Some of this is due to high frequency effects, and some is due to the relationship of the wavelength of the signal being set over the wire to the length of the conductor. describe both of these limitations and their effects
Box 1 contains 5 red, 6 white, and 9 blue balls. Box 2 contains 7 red, 8 white, and 4 blue balls. A ball is withdrawn at random from Box 1 and placed in Box 2. Then, a ball is taken at random from Box 2.
Design a counter whose countsequence is all prime numbers greater than 4 but less than 55. Youdo not have to draw a schematic, but you must provide theexcitation equations for the FFs.
Desing a logic circuit that implements a serial adder/subtracter with accumulator for a 6-bit binary number. you should use one of the imputs to select between the adder and the subtracter. Asumme that negative numbers are represented by 2's compl..
PROJECT: PIC18F TITLE: LCD CODE MICROCONTROLLER: LCD WRITE THE CODE TO PERFORM THE FOLLING TASKS: INTERFACE WITH LCD CONTROLLER INITIALIZE THE LCD CLEAN THE LCD INITIALLY DISPLAY NUMBERS AND LETTERS ON LCD POSITION THE CUSSOR WITHIN A NON MOVE TO THE..
The power consumption of asingle-phase electric load fed from a 120 volt source representedby: P(t) = 100 (1-e-t/10) KW where t is the unit time inhours. Compute the energy consumed by the load over the period of 24 hours.
Imagine you have been hired to develop an advertising campaign for a new fictional brand. Selecting a product category with which you are comfortable, identify a niche that is not being served by an existing brand. Next, develop a brand and pr..
Find its unit step response when the ICs are y[-2] = 2 and y[-1] = 1. Be sure to identify the three parts of the solution: zero-input, transient zero-state, and steady-state zero-state.
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