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1. Although air-handler cabinets may be made of galvanized steel, there are still areas that may be subject to corrosion. Why?
2. Describe the two general types of AHUs.
3. List the components of an FCU.
A series-parallel circuit contains both series and parallel connections in different arrangements. Do you find it useful to isolate the parallel sections and calculate their resistance first
If the voltage drops by 20 % , what will be the current, assuming nothing else changes If the resistance of the device were reduced by 20 % , what current would be drawn at 240 V
Combine the impedances and find phasor current in the two circuits by using Phasor Ohm ( I= V/Z), then find voltage across each element (eg: VR = I * ZR ). Setting magnitudes equal is the same as setting the square of the magnitudes equal.
The duration of a cellular call is an exponential random variable with expected value of 3 minutes. A subscriber makes 120 calls each month. Use the central limit theorem to estimate the probability that the subscriber uses at least 400 minutes.
In a certain transistor amplifier circuit, the transistor can be represented by a 10 mA current source, as shown in Figure 31. In a certain transistor amplifier, two transistors act in parallel. How much current is there through the resistor RE?
Two infinite sheets of charge lie parallel to each other, separatedby a distance d. The upper and lower sheets have surfacecharge densities ρsa andρsb[C/m2], respectively. find the voltage Vab from the top to the bottom surface.
A three phase motor draws 20kva at 0.7 lagging power factor from a 240 V source. Determine the kVAR rating of the capacitors to make the combined power factor 0.9 lagging and determine the line current before and after the capacitors are added.
What type of transistor has an insulated gate? 2. An n-channel JFET is biased such that VGS = -2 V using self-bias. The gate resistor is connected to ground.
In a proposed design for an electric automobile, the shaft of a four-pole three-phase induction motor is connected directly to the drive axle; in other words, there is no gear train. The outside diameter of the tires is 20 inches. Instead of a tra..
A 1000-W iron is left on the ironing board with its base exposed to the air at 20°C. If the temperature of the base of the iron is 150°C, determine the rate of energy destruction for this process due to heat transfer, in steady operation.
Control Systems: Operation of a PID, Which one of the following statement regarding to operation of a PID is true?
An infinite grounded conducting tube of radius 10cm is centered on the z axis. A concentric charged tube of radius 6 cm has a surface charge density of 24 uC/m2. A 1m long section of the charged tube is compressed to change its radius to 3 cm.
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