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A 2.4 kVA, 2400/240-V, 50Hz, step down transformer has the following parameters:
R1=1.5 ohms
R2= .02 ohms
X1= 2.5 ohms
X2=.03 ohms
Rc1=6000 ohms
Xm1=8000ohms
It is operating at 50% of its rated load at a power factor of .5 leading, compute efficiency using both exact and approximate equivalent circuits as referred to the primary side. Tabulate the percent errors in the currents, voltages, powers, and efficiency caused by approximation
The unknown input impedance of a horn antenna operated at a frequency of 300MHz is measured using a slotted transmission line and a Smith Chart. When the antenna is connected to the slotted line, the VSWR on the line is measured to be 4
Assume that the Fermi energy level for a particular material is 6.25eV and that the electrons in this material follow the Fermi-Dirac distribution function. Calculate the temperature at which there is a 1% probability that a state 0.30eV
Solve the equation z^2+z+1=0 using z=(x,y) and the basic definitions. (Hint: Note that y does not equal 0 because the equation X^2+X+1 does not equal 0 for any real number x.)
A p-type wafer has a diffused Phosphorous n-type junction with a junction depth of 0.15µm. a) If the wafer (no pre-existing oxide) is to be oxidized at 1000 C for two hours to form a ‘dense.
Evaluate the TL parameters. Include the effect of the earth as ideal. Do not incorporate the effect of the shield wires.
A rectangular loop of wire containing a high resistance voltmeter has corners initially at (a/2, b/2, 0), (-a/2, b/2, 0), (-a/2, -b/2, 0) and (a/2,-b/2, 0). The loop begins to rotate about the x axis at constant angular velocity w.
A computer employs RAM chips of 256 x 8and ROM chips of 1024 x 8. The computer system needs 2K bytes of RAM, 4K bytes of ROM, and four interface units, each with four registers. A memory-mapped I/0 configuration is used.
A fluid flows through a turbine at the rate of 45 kg/min. Across the turbine the specific enthalpy drop of the fluid is 580 kj/kg and the turbine loses 2100 kj/min in the form of heat energy. Determine the power produced by the turbine.
Calculate the minimum PWM frequency for a small permanent magnet DC motor with a time constant of 15 milliseconds.
Design a hand warmer with a heated element consisting of an encapsulated resistor to be held in your hand and powered by a 6V battery that you put in your coat pocket. Use 26 gauge wire to connect the resistor to the battery.
a) Using K-Map, find the minimum product-of-sums for the following function. Circle the term on the map and write the result in algebraic form. b) Draw the block diagram in NOR-NOR.
A 220 V, 1500 rpm, 11.6 A (armature current) separately excited motor is controlled by a single phase, full wave SCR converter. The armature resistance of the motor is 2 ohm. The ac source voltage is 230 V (rms) 60 Hz.
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