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A 10kVA, 200/400V 50Hz single-phase transformer gave the following test results. O/C test: 200V, 1.3A, 120W, on l.v. side. S/C test: 22V, 30A, 200W on h.v. side.(a) Calculate the magnetizing current and the component corresponding to core loss at normal frequency and voltage.(b) Calculate the magnetizing branch impedances.(c) Find the percentage regulation when supplying full load at 0.8 p.f. leading.Determine the load which gives maximum efficiency, and find the value of this efficiency at unity power factor.
A platinum resistance coil has a resistance at O0 C of 100 . Determine the change in resistance that will occur when the temperature rises to 30°C if the temperature coefficient of resistance is 0.0039 K-1.
A clever student notices that a high constant loop gain would make the PLL converge in frequency and phase. Rather than use an amplifier with infinite gain the student decides to just use an unstable filter.
A HCS12 ATD is set to 10-bit unsigned mode. The voltage references are set to ground and 1.0V What is the ADT output for a temperature of 81 degrees The temperature sensor measures 0 to 100 degrees with an output of 10 mV/degree.
Delta load Assume that the load is delta connected. Each phase has a series RL load with R = 5 ohms and L = 20 mH. Plot the phase to phase voltage (Vab) versus time for one cycle. Hint: Vab = Va - Vb
A 60-Hz, 765-KV three-phase overhead transmission line has four ACSR 900 kcmil 54/3 conductors per phase. Determine the 60-Hz resistance of this line in ohms per kilometer per phase at 50 degrees Celsius.
Compute the maximum and minimum spectral frequencies received by a mobile traveling at a speed of 100 Km/hr. What is the frequency of the received signal if the mobile is moving in a direction perpendicular to the direction of arrival of the trans..
A series of combination having R=2Mohm and C=0.01 UF is connected across a D.C. voltage source of 50V. Determined capacitor voltage and charging current after 0.02s, 0.04s and 1 hour.
Telephone channels have a bandwidth of about 3.1khz. do the following in excel. A) If a telephone channel signal to noise ratio is 1000, how fast can a telephone channel carry data?
The continuous-time counterpart to the N-point discrete-time MA filter is the I-interval continuous-time MA filter given by the input/output relationship y(t)=(1/I)*Integral of x(lamda) delta lambda where the bounds are from t-I
The memory unit, 2M x 32, is specified by the number of words times the number of bits per word. How many address lines and input-output data lines are needed And give the number of bytes stored in the memory.
A selective-repeat (SR) data link layer protocol uses 4 sequence bits to number it's frames. The source, C starts from frame 0 and proceeds following the Sr protocol. Let us start analyzing the frame/ACK transmissions when the first outstanding fr..
A constellation diagram has four points located at (2,2), (-2,2), (-2, -2), and (2, -2) on the I(in-phase)-Q(quadrature phase) plane. Find the value of peak amplitude and the type of modulation this diagram represents.
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