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An iron ring of mean length 50 cm and csa 0.8 cm2 is wound with a coil of 350 turns. A current of 0.5 A through the coil produces a flux density of 0.6 T in the ring. Calculate
(a) the relative permeability of the ring,
(b) the inductance of the coil, and
(c) the value of the induced emf if the current decays to 20% of its original value in 0.01 s, when the current is switched off .
Sketch the circuit symbol for a transformer, and explain its principle of operation. Why is the core made from laminations? Is the core material a ‘ hard ' or a ‘ soft ' magnetic material? Give the reason for this.
a hollow conducting cylinder has inner radius a and outer radius b and carries current i along the positive z-
The Dinorwig pumped storage hydroelectric facility in Northern Wales utilizes an abandoned slate quarry named Marchlyn Mawr as the upper reservoir. 600 meters below the Llyn-Peris lower reservoir can be found. The plant contains six 288MW generato..
A satellite is 30,000 km from the Earths surface, receives signals at 14 GHz transmitted from the earth with an average power of 50 W, with an antenna gain of 55 dB in the direction of the satellite receiving antenna.
An engineer intends to study an input signal with frequency components of 5, 6, and 10 kHz. It is desired that all other frequencies be filtered out. Design an appropriate filter, using L= 210mH and the MINIMUM bandwidth. Find C and R.
Many types of decorative lights are connected in parallel. If a set of lights is connected to a 110 V source and the filament of each bulb has a hot resistance of 2.2 k Ω, what is the current through each bulb? Why is it better to have these bulbs..
If we decide to design a highpass filter using this transformation and we wish the resulting highpass filter to be symmetric, which of the four types of generalized linear-phase FIR filters can we use for the design of the lowpass filter? Your ans..
If voltage and resistance are measured as a means of indirectly measuring power, show again that if the relative uncertainties in the direct measurements are +2%, that the relative uncertainty in the indirectly measured power will be +6%.
State the relationship between D and E in a dielectric material. How does it simplify the solution of field problems involving dielectrics?
Suppose we measure the noise in a resistor (with no applied voltage) and find that the noise voltage exceeds 10 μV 5% of the time.
Determine the ideal impulse response hd [n] to which the Kaiser window should be applied
Determine the bit line voltages v1 and v2 after the cells are addressed for the case when (a) a logic 1 is stored and (b) a logic 0 is stored.
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