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A 15kV:175kV, 125 MVA, 60 Hz single-phase transformer has primary and secondary impedances of 0.0095+j0.063 per unit each. The magnetizing impedances is j148 per unit. All quantities are in per unit on the transformer base. Calculate the primary andsecondary resistances and reactances and the magnetizing inductance (referred to the low voltage side) in ohms and henerys.
A chemical engineer has developed a new chemical formularfor a fuel additive. He has written a textbook containing the formula. He has also started a new company to market his fuel additive, and has decided to use his initials as the company logo.
A1. An amplifier has cutoff frequencies of 120.0 Hz and 1.200 kHz. Calculate the bandwidth and center frequency of the amplifier. A2. The upper cutoff frequency of an amplifier is 8.000 MHz and its center frequency is 1 MHz.
Suppose unchirped Gaussian pulses at f = 1:55 fm are used to transmit binary data. You're given that the fiber dispersion parameter f = 17 ps/km-nm, and the dispersion length LD = 115 km. What is the half-width of the pulse at the origin
A series circuit has a resistance of 1 ohm and an inductance of 1 ohm. The voltage across the circuit has an amplitude of 15 volts and a phase shift of 30 degrees. What is the current of the circuit in frequency and time domain
A torque of 10 N.m is applied to a uniform disk shaped flywheel. The flywheel has a mass of 20kg and a radius of 0.5m. At t=0, the flywheel is at rest. How much energy is stored in the flywheel at the end of 20 sec
Explain the operation of sequential logic devices and evaluate the output waveform in relation to the clock for QA, QB and QC in the subsequent circuit and show the binary sequence represented by these waveforms
One end of a long glass rod (n = 1.3) is a convex surface of radius 4.9 cm. An object is located in air along the axis of the rod, at a distance of 10 cm from the convex end. (a) How far apart are the object and the image formed by the glass rod
An emitter-follower circuit is built using an npn transistor with ß=100 and with RE =1k-ohm. What is the input impedance of the open circuit. If a load of 100-ohm is connected to the output of the circuit, what is the input impedance
The dimmer knob is adjusted such that it applies voltage to the load during the initial 28 % of each half cycle of the standard 120V/60 Hz AC voltage. Find the real (average) power dissipated on the load in watts.
If R2 = 2R1, R3 = 3R1 and the total power taken by the circuit is 480 watts. Calculate the power in each resistor
Two amplifiers are cascaded, one with a voltage gain of 6 db and the other with a voltage gain of 4. If 1 V is applied at the input of the first amplifier, what is the voltage at the output of the second amplifier
Assuming that the secondary is open-circuited and that the primary is connected to a 13.8-kV source, calculate the magnitude and phase angle (with respect to the high-voltage source) of the voltage at the secondary terminals.
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