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ENGINEERING
COLLEGE
. Were you able to observe ???? = 0 in the circuit you constructed during lab? Why or why not? Hint: What value of resistance would be needed for ???? = 0? 2. What feature in the time response of an RLC circuit distinguishes a critically damped response from an underdamped response? 3. Why must an op-amp be powered to be used in a circuit? 4. If you were handed a parts kit with an unknown op-amp, what information would you need to find prior to using it in a circuit?
ENGINEERING
COLLEGE
Aluminum alloys are made by adding other elements to aluminum to im prove its properties, such as hardness or tensile strength. The following table shows the composition of ve commonly used alloys, which are known by their alloy numbers (2024, 6061, and so on) [Kutz, 1999]. Obtain a matrix algorithm to compute the amounts of raw materials needed to pro duce a given amount of each alloy. Use MATLAB to determine how much raw material of each type is needed to produce 1000 tons of each alloy. Composition of aluminum alloys Alloy %Cu %Mg %Mn %Si %Zn 2024 6061 7005 0 7075 356.0 0 0.6 0 0 0 0 4.5 5.6 0 0.6 0 0 2.5 0.3 0
ENGINEERING
COLLEGE
A system with a mass of 8 kg, initially moving horizontally with a velocity of 40 m/s, experiences a constant horizontal force of 25 N opposing the direction of motion. As a result, the system comes to rest.Determine the amount of energy transfer by work, in kJ, for this process and the total distance, in m, that the system travels.
ENGINEERING
COLLEGE
What is the primary function of NCEES?
ENGINEERING
COLLEGE
Whats are the best choice of cooling towers for electeic generating power plant and why?
ENGINEERING
COLLEGE
Analyze that, “Convection is equal to the Conduction plus fluid flow.”
ENGINEERING
COLLEGE
What is the function of deaerator in thermal power plant?
ENGINEERING
COLLEGE
1. The presentation of data is becoming more and more important in today's Internet. Some people argue that the TCP/IP protocol suite needs to add a new layer to take care of the presentation of data. If this new layer is added in the future, where should its position be in the suite?
ENGINEERING
COLLEGE
After the load impedance has been transformed through the ideal transformer, its impedance is: + . Enter the real part in the first blank and the imaginary part in the second blank. If a value is negative, include the negative sign. Provide up to four digits of precision. If the exact value can be provided with fewer digits, merely provide the exact value. These instructions pertain to the following blanks as well. What is the total impedance seen by the source? + . What is the current phasor Ig (expressed in rectangular form)?
ENGINEERING
COLLEGE
Calculate how large a mass would be necessary to obtain a mechanical noise limit of [Equation] = 1 nG, 1 µG, and 1 mG if the mechanical resonance frequency is [Equation] = 100 Hz. If the mass is to be made of cube of `silicon, what would its physical dimensions be?
ENGINEERING
COLLEGE
A 2-m3insulated rigid tank contains 3.2 kg of carbon dioxide at 120 kPa.Paddle-wheel work is done on the system until the pressure in the tank rises to 180kPa. Determine the entropy change in the carbon dioxide during this process. Assumeconstant specific heat and room temperature at 300 K
ENGINEERING
COLLEGE
B. Suppose R1 is a fuse which burns out due to a sudden surge of current, thus, it essentially becomes an open switch. How do the currents change after this?
ENGINEERING
COLLEGE
Internal and external flow boiling regimes?
ENGINEERING
COLLEGE
Benzene vapor at 480°C is cooled and converted to a liquid at 25°C in a continuous condenser. The condensate is drained into 1.75-m3 drums, each of which takes 2.0 minutes to fill. Calculate the rate (kW) at which heat is transferred from the benzene in the condenser.
ENGINEERING
COLLEGE
A furnace is shaped like a long equilateral triangular duct where the width of each side is 2 m. Heat is supplied from the base surface, whose emissivity is ε1 = 0.8, at a rate of 800 W/m2 while the side surfaces, whose emissivities are 0.5, are maintained at 500 K. Neglecting the end effects, determine the temperature of the base surface. Can you treat this geometry as a two-surface enclosure?
ENGINEERING
COLLEGE
A bathroom scale uses four internal strain gauges to measure the displacement of its diaphragm as a means for determining load. Four active gauges are used in a bridge circuit. The gauge factor is 2, and the gauge resistance is 120 Ω for each gauge. If an applied load to the diaphragm causes a tensile strain on R1 and R4 of 40 x 10-6, while gauges R2 and R3 experience a compressive strain of 40 x 10-6, estimate the bridge deflection voltage. The supply voltage is 5 V. a,b,c or d? a.400 x 10-6 V b.600x10-6V c.800x10-6V d.1000 x 10-6 V
ENGINEERING
COLLEGE
Q/For the circuit showm bellow:a) find the mathematical expression for the transient behavior of ve and ic after closing the switeh,b) sketch vc and ic.
ENGINEERING
HIGH SCHOOL
Technician A says the final drive assembly always has a gear ratio of 1:1. Technician B says the final drive assembly provides further gear reduction between the transmission and the drive wheels. Who is correct?
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