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A solution consisting of four parts 70% HNO3 , four parts 49% HF, and two parts CH3COOH is used to etch silicon. If the solution is held at room temperature, what etch rate would you expect? If the
You have a 120 Ω quarter bridge 2 wire set up with Sg=2.10 and an unknown lead wire resistance. A 59880Ω calibration resistor is switched in parallel to the gage only and a recording instr
In 1988, the average wage rate was $9.45 an hour and in 2008 the average wage rate was $18.00 an hour. The CPI in 1988 was 118.3 and in 2008 it was 215.3 . Which real wage rate is higher ?
Design a parking gate mechanism for use in a building where it needs to fold due to the height of that location. Dimensions are shown fig. The gate fixed pivots must be somewhere on the control post.
Three resistors R1, R2 and R3 are connected in series and a supply voltage of 240 V. If R2 = 2R1, R3 = 3R1 and the total power taken by the circuit is 480 watts. Calculate the power in each resi
A machine used for making (cutting) gears is called a gear hobbing machine. The gear train below shows the essential features of the work spindle drive for a gear hobbing machine.
A dc series motor (A) should always be started on load (B) is most suitable for high starting torque. (C) always run at constant speed. (D) may 'run away' if the field gets opened.
How many times more ignition energy is required to achieve ignition of a fuel-air mixture at sea level with T = 298 K than at altitude of 6000 m where pressure P = 47,166 Pa and T = 248 K?
A composite load consists of two loads connected in parallel. One draws 100 W at a PF of 0.8 lagging, another takes 200 W at a PF=1. What is the PF of the composite load ?
In a Carnot cycle, heat is supplied at 350°C and rejected at 27°C. The working fluid is water, which, while receiving heat, evaporates from liquid at 350°C to steam at 350°C.
A lossless 10 - turn helical antenna with a circumference of one -wavelength is connected to a 78-ohm coaxial line, and it is used as a transmitting antenna in a 500 MHz spacecraft communication sy
Beam ABC of length 1.0 m and solid circular cross-section of diameter 30mm, that is pinned at C and simply supported at A.
Eble Company proposes to invest $6 million in a new type of text printing equipment. The fixed costs are $1 million per year. The equipment is expected to last for 5 years. The manufacturing cos
A gas is compressed inside a compressor's cylinder. When the piston is at its bottom dead center, the gas is initially at 10 psig, 65°F, and 10.5 in 3 . After compression and when the piston
A mass of 200 g of saturated liquid water is completely vaporized at a constant pressure of 100 kPa. Determine (a) the volume change and (b) the amount of energy added to the water.
A separately excited dc generator produces a no load voltage of 115v.what happens if the speed is increased by 20% and the exciting current is increased by 10%
Just a few degrees above the BCC to FCC transition temperature an iron membrane allows a flux of 10 carbon atoms/cm2-s to diffuse through.
A 100 ? resistive load is attached to a lossless TL of 50 ? characteristic impedance (l_1 = 2.25cm), which itself is preceded by a 100-? TL line (l_2 = 11.25cm). If f=2GHz and up = 0.6c (c is the s
Determine the force in member BC. After the truss is sectioned use a single equation of equilibrium for the calculation of each force. State if these member is in tension or compression. Take F1 = 2 k
Efficiency in a power transformer is 98.6 percent when loaded such that its copper losses are five times its core losses. Calculate the per unit resistance of this transformer?
Calculate the transverse modulus of the peek/carbon fiber composite with 30% volume fraction by tow method. the modulus of peek is 3.8 GPa and the modulus of the carbon fiber is 400GPa. assume the rei
Create a logic function that takes in a 4-bit two's complement integer (D[3:0]) and generates an output (Mul3) that is 1 when the input is a multiple of 3. Complete the truth table below, and dra
An ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compression process is 95 kPa and 20°C.
A resistor is required for an application that requires its value to be no less than 7.1k ohms and not more than 7.9k ohms. determine the nominal value and the maximum tolerance of the resistor y