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(a) A chopper controlled electric train is powered from a 1500 VDE supply. The power semi- conductor switch element hasaminimum effectice ON time of 40 Ms. during starting and slowspeed running, the output of the chopper has to go as low as 15 V. what is the highest chopper frequency possible to satisfy thisreqirement ?
(b) The chopper in (a) has a minimum effective OFF time of 30 Ms.The chapper frequency is 2000Hz(i) what is the maximum duty cycle and maximum output voltagepossible?(ii) if the full input voltage is to be made available to theload, show how this can be done
1-for an FM reciever tuned to 94.5 MHZ using high side-injection and a first IF of 10.7 MHZ, Determine the image frequency and the local oscillator
air expands through a nozzle at a rate of 1kg/sec. the outlet is at 15kpa and the inlet is at 400kpa,150degree and 35m/sec. assuming the process to be reversible and adiabatic, what is the exit velocity.
design a logic program that will track the activity for one turnstile. there will be three inputs PHASEA, B and RESET. there will be no output. the program should be able to track 999 total guests.
the solutions at both frequencies about a total transit time of 1000 years (speed of light in a vacuum result) such that subtracting one from the other leaves just the delay that is of order of 1 second.
aluminum has the FCC crystal structure. Its atomic weight is 26.98g/mole, and its density is 2.70g/cm3. Determine the atomic radius of a single aluminum atom.
Suppose the volume X occupied by a capacitor is A*d where A is the total area of the dielectric layers and d is the thickness of each dielectric layer (this assumes that the metal plates are infinitely thin).
A sinusoidal signal is riding on a 2 v DC offset (in other words, the average value of the total signal is 2 v). Design a circuit to remove the DC offset and amplify the sinusoidal signal (without phase reversal) by a factor of 100.
Design a full-wave bridge rectifier circuit to deliver 10 volts de with less than 0.1 volt (pp) ripple into a load draWing up to 10mA. Choose the appropriate ac input voltage. assuming 0.6 volt diode drops.
design a 4 bit register with 4 different kinds of flip flops, that has at least 12 different functions. list clearly the functions. Do something creative, and say exactly your innovation. at least one flip flop should have some input besides a mul..
A half-wave rectifier circuit with a 1-Kwload operates from a 12-v(rms) 60-Hz household a 5-to 1 transformer having a center-tappedsecondary winding. It use two silicon diodes that can be modeled tohave a 0.7-v drop for all currents.
Assume that a load Z absorbs power of 150 W at a lagging power factor of 0.8, and the voltage across the load Z is 220 Vms, 50 Hz. What must be the value of capacitor that needs to be connected in parallel with the load Z
When using current mirrors as current amplifiers, a dc current source is often included on both the input side and the output side of the current mirror. What is the purpose of these dc current sources
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