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1. List the associations that establish national standards for the HVACR industry.
2. What is the function of AHRI?
3. What does the UL specialize in?
4. List all major phases of system installation.
Two small plastic spheres are given positive electrical charges. When they are a distance of 15.6{\rm cm} apart, the repulsive force between them has a magnitude of 0.235{\rm N} .What is the charge on each sphere if the two charges are equal
design a 7-tap band-pass FIR filter with linear phase response. The lower cutoff frequency is 2,500 Hz, and upper cutoff frequency is 4000 Hz. The sampling frequency is 10,000 Hz. What is the filter impulse response
Write and test a C program that outputs a waveform that switches from 10.0 kHz with a 50% duty cycle to 25.0 kHz with a 5% duty cycle every 5 seconds. Your code design must be modular - initializations and program operations are to be performed
1-why placement of grounds is significant to obtaining accurate measurements when using instruments that can be grounded, such as scopes and 2) why should we never connect a DMM that is set up to measure current across a voltage supply
Two star-connected generators are connected in parallel and supply a balanced load of 1500 kVA at 11 kV line voltage and 0.8 lagging power factor.
A 500V shunt dc motor has a nominal armature current of 40A, and operates at 1200 rpm. if the armature resistance is 0.25 (ohm), calculate The valve of a starting resistor limiting the initial armature current to 60A
Calculate the approximate diameter and length of stator core, the number of stator slots and the number of conductors for a 20KW,400V,3 phase,4pole,1200rpm,delta connected induction motor. Bav=0.5T, Kw=0.82, ac=26000amp.cond/m, power factor=0.8L/=..
A 1.12 kg block is attached to a horizontal spring with spring constant 3500 N/m. The block is at rest on a frictionless surface. A 10 g bullet is fired into the block, in the face opposite the spring, and sticks.
Suppose that a voice signal normally occupies 30 kHz of bandwidth and has a signal-to-noise ratio of 20 dB. Spread-spectrum techniques are used to increase its bandwidth to 2 MHz. (a) What is the signal-to-noise ratio of the spread signal
Assuming system gains of Gt = 0 dB, Gr = 3 dB, find the power received at the mobile using the two-ray ground reflection model assuming the transmitter antenna height to be 50 m, and the receiving antenna is 1.5 m above the ground with a path loss..
A load consists of a resistance R in parallel with a capacitor of reactance X. The load is fed from a single phase supply through a line of impedance 8.4 + j11.2 ohms. The rms voltage at the load terminal is 1200 at 0 degress V rms,
explian why a single phase IM is not self starting.descibe two ways that can make a single phase IM self starting compare tha air gap mag filed produced bt 1 phase IM and 3 pahse IM
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