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An electric heater is connected to a constant 240-V source and absorbs 1000 W. Subsequently, this heater is connected to a constant 210-V source.
(a) What is the resistance of the heater?
(b)What power does it absorb from the 210-V source?
Compare the readings of two ammeters of unequal resistance when placed in parallel with each other and the combination inserted in series in a circuit.
Two components of linear distortion produced by transmitting asignal through an LTI (linear time invariant) system: Amplitude distortion - the frequency components of the input signalare transmitted through the system with different amounts of gain..
Assume that a receiver has a first amplifier stage with a 5K-ohm input resistance, a gain of 300, an input audio signal of 20V, and an operating temperature of 27oC. When the amplifier is operating with a bandwidth first of 10 MHz
A three-phase wye-delta transformer is rated 225-kV:24-kV, 400 MVA and has a single-phase equivalent series reactance of 6.08 ohms as referred to its high-voltage terminals. The transformer is supplying a load of 375 MVA
Design a circuit to supply a -2.5 reference voltage as the input to a voltage follower if only 9 V batteries are available. Use an In4740 diode, which has a Zener voltage of 10 v at a current of 25 mA.
When fed from a signal source with a peak amplitude of 0.1v and a source resistance of 20k , the peak amplitude v(pi)is 5mv. specify Re and bias current Ic. The BJT has beta =100. If the total resistance in the collector is 5 k,
Design a 3-bit synchronous counter that counts the sequence 7, 4, 2, 1, 6, 5, 7, ect. Use "don't-cares" for the "next states" of the unwanted states. Use a D flip flop for the most significant bit, a T flip flop for the middle bit, and a JK flip f..
The sampling frequency in a DSP system is fs=8 kHz. Anti-aliasing filter used in the system is the second-order Butterworth filter with cutoff frequency of fc=3.4 kHz. What is the percentage of aliasing level at the frequency f=2.5 kHz
A large brass washer has a 2 cm inside diameter, a 5 cm outside diameter, and is 0.5 cm thick. Its conductivity is s=1.5 X 107 S/m. The washer is cut in half along a diameter, and a voltage is applied between the two rectangular faces of one part.
The bit energy to one-sided noise density at a PCM receiver input is 30 dB. Referring to the figure above, determine the approximate detected S/N ratio (in dB) for 8-bit BPSK with a matched filter detector.
A 3 phase Y connected alternator is rated at 1600 KVA, 13500 V. The armature resistance and synchronous reactance are 1.5 ohms and 30 ohms respectively. Calculate the % voltage regulation for a load of 1280 KW at 0.8 leading power factor.
A three-phase fault occurs at the generator terminals causing the angle of part (c) to increase. The fault is subsequently cleared. Find the maximum value that this angle can reach during the fault (i.e. the critical clearing angle) so that the ge..
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