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A 6 pole d.c. generator runs at 1200 rpm on no load and has a generated emf of 250 v. If armature diameter is 350 mm and the radial airgap between field poles and armature is 3mm. The axial length of field poles is 260 mm and the field pole effective coverage is 80% including fringing. If the armature has 96 coils having 3 turns per coil and is waind duplex lap, calculate
i) Flux per pole
ii) Effective pole arc length
iii) Average air gap flux density.
A sign on hte door of a room you are abour to enterreads DANGER 10,000 VOLTS. Knowing that your body reistance ispresently 500 kΩ, should you worry about touching any of the equipment i the room
A load is drawing 10 A rms when connected to a 1200 V rms supply running at 50 Hz. If the source is operating at a lagging PF of 0.9, calculate (a) the peak voltage magnitude; (b) the instantaneous power absorbed by the load at t = 1 ms
The duration of a cellular call is an exponential random variable with expected value of 3 minutes. A subscriber makes 120 calls each month. Use the central limit theorem to estimate the probability that the subscriber uses at least 400 minutes.
A Dc machine is connected across a 240-volt line. It rotates at 1200 rpm and is generating 230 volts. the armature current is 40amps. A) Is the machine functioning as a generator or motor
What is the propagation delay fora 2 level 16-bit adder, using 4-bit carry look aheads and what are the components of the delay Assuming each gate introduces a unit time propagation delay.
Draw the circuit and discuss the operation of SA type ADC. Determine the conversion time of an SA-ADC for 12-bit resolution,at 2.5 MHz.
An op-amp is connected in an inverting amplifier configuration with a voltage gain of -80 and is biased at ±5 V. If the output saturates at ±4.5 V, what is the maximum rms value of an input sine wave that can be applied without causing distortion ..
What is the frequency mode spacing for this length of Iaser? If it is possible to mode lock this Iaser, what would be the repetition rate and approximate pulse width of the output pulse when the line width of the Iaser is 10 GHz? State any assumpt..
A measurement of interest in the summer is the temperature-humidity index, consisting of the sum of the temperature and the percentage relative humidity. How would you measure this? Sketch a simple schematic diagram.
How close is the full-load condition of this generator to the static stability limit?
A buck converter has Vs=30 V, Vo=20 V, and a switching frequency of 40 kHz. The output power is 25 W. Determine the size of the inductor such that the minimum inductor current is 25 percent of the average inductor current.
using the time independent one dimensional schrodinger equation find the expression of the allowed energy levels for
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