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A 2-pole commutator machine,with 100 ampere turns, is runningat 1200 r.p.m. clockwise. The stationary flux of 0.12 Wb. perpole is sinusoidally is distributed in space. The brushes areseparated by an angle θ = 60 degree andthe centre line of brush separation coinsides with field axis.(a) Find the magnitude of e.m.f. across the twobrushes.(b) If the field flux of constant amplitude 0.12 Wb., isassumed to be rotating at 1800 r.p.m., in the (1) Clockwise direction and (2) anticlockwise direction, then compute the magnitude andefficiency of the brush e.m.f. when θ = 60 degree,Also calculate the frequency of conductor e.m.fs in both the cases.(c) The armature at the other end of thecommutator is tapped and connected to balanced 3-Phase voltages, sothat a rotating field is produced, The speed of this rotating fieldis 3000 r.p.m. (1) clockwise and (2) anticlockwise,.Find thefrequency of the brush e.m.f. in the two cases.
A given peripheral has 3 address lines (allowing access to 8 internal addresses) and requires that address lines A2-A0 to be used. It is desired that this peripheral occupy the hex address range, EB80-EB82 in a given computer system memory map
A line has an inductance of1.25mH/km with an impedance angle of 70 degree , and a capacitance to neutral of 0.01mF/km. Calculate its reactance and series impedance per unit length at 50Hz. Calculate the line admittance per unit length
Assuming the resistance versus temperature function to be linear, determine the expected resistance of the material at 0 degrees celcius( the freezing point of water) and at 100 degrees celcius (the boiling point of water)
Suppose the above device is to be used as an 8-way power splitter (let's say only the top-most input is used). Let the input power be P. Assuming a cross-coupling coefficient of f and ignoring excess losses, what are the possible power levels Pi a..
An op-amp has an open-loop gain of 200 V/V. If this op-amp is used to build an inverting amplifier with an absolute gain of 50V/V: (a) What must the smaller resistor be adjusted to, if the larger resistor is 100 k
A three-phase 765-KV, 60-Hz,300-km,completely transposed line has the following positive-sequence impedance and admittance: z=0.0165+j0.3306 Ω/hm y=j4.674x10-6 S/km ten to the minor six
If passwords are three uppercase alphabetic characters long, how much time would it take to determine a particular password, assuming that testing an individual password requires 5 seconds
the signal shown below is a sine wave as it might be displayed on an oscilloscope. If it takes 40 msec. for the waveform to travel between the points shown by the arrow "B" below, what is the frequency of the waveform
In a certain balanced three-phase system, each line current is 5A and each line voltage is 220 V. What is the approximatereal power, if the power factor is 0.7
A 60-watt outdoor lightbulb is advertised as having an average life (i.e. MTTF) of 1,000 operating hours. However, experience has shown that it will also fail on demand an average of once every 120 cycles.
1.explain what is the instantaneous values of AC AND phase shift angle are. Explain what the effective and average values of AC are. How are they related with amplitude. 2.Draw a calculated conductivities triangle for the circuit with a parallel co..
A waveform generator is connected to an op-amp which has been setup as a voltage follower. The voltage follower is then loaded with a 50 Ohm resistor. What output impedance setting should the waveform generator use
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