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A 4-pole,3-phase induction motor operates from a supply whose frequency is 50HZ.
Calculate:i) the speed at which the magnetic field of stator is rotating.
ii) the speed of the motor when the slip is 0.04.
iii) the fequency of the rotor currents when the slip is 0.03.
iv) the frequency of the rotor currents at standstill.
we have two light bulbs a and b. bulb a has an exponentially distributed lifetime with mean lifetime 4 days i.e la
A cast steel magnetic circuit with N = 2500 turns, I = 200 mA, and a cross sectional area of 0.02 m2 has an air gap of 0.00254 m. Assuming 90% of the mmf appears across the gap, estimate the flux in the core.
Determine the speed and number of bits if this signal is to update the output 100 times per signal and be capable of representing the desired output value to better than 0.5 mV.
Find the gain in decibels of an amplifier that has a straight gain of 7000? Find the current in a ground loop that is 200 m long, has a wire resistance of 0.06 ohms/m, and has a difference of 4 V between grounds?
Air at 25°C flows over a 10-mm-diameter sphere with a velocity of 25 m/s, while the surface of the sphere is maintained at 75°C (a) What is the drag force on the sphere?
A proton moves around a circular path ( radius = 2.0 mm ) in a uniform .25-T magnetic field. what total distance does this proton travel during a 1.0-s time interval ( m= 1.67x10-27 kg = 1.6x10-19 C)
how can we write those operations just once but allow them to be easily used whenever needed within a program or from
Explain why it is unlikely one would encounter a circuit exhibiting a critically damped response in practice. What impact would time and temperature have on a supposedly "critically damped" circuit
the diameter of a semiconductor plate of radius a is kept at 0 degree centigrade and the temperature at the boundry is T degree centigrade. Find the steady state temperature in the plate.
Find the current through the discharge resistor 100 ms after the breaker is tripped.
A 50 hp, 460 V, three phase induction motor draws 61 amps when operating at rated voltage and at a power factor of 0.85 lagging when supplying a rated load. knowns: 1hp=746watts effeciency (n) = Pout/Pin = Pout/(Pout+losses)
a capacitor, an electric resistance heater, and an impedance are connected in parallel to a 120 volt, 60 Hz. system. the capacitor draws 50 VARs, the heater draws 100 watts and the impedance coils draws 269 VA at a power factor of 0.74 lagging.
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