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1. A 15 kW. 400 V, 3-phase, star-connected synchronous motor has a synchronous impedance of 0.4 + j4 Ω. Find the voltage to which the motor should be excited to give a full-load output at 0.866 leading pf. Assume an armature efficiency of 93%. Also calculate the mechanical power developed.
2. A 3-phase, star-connected synchronous generator is rated at 1200 kVA, l l kV. On short-circuit a field current of 55 A gives full-load current. The OC voltage with the same excitation is 1580 V/phase. Calculate the voltage regulation at
(a) 0.8 lagging and
(b) 0.8 leading pf. Neglect armature resistance.
An electronic PI temperature controller has an output p of 12 mA when the set point equals the nominal process tmperature. The controller response to step change in the temperature set point of 3 mA
A d-c voltage Vo is applied att = 0 directly to the input terminals of a lossless air dielectric transmission line of length l. The line has a characteristice resistance Ro and is terminated in a load resistanceRL =2Ro.
A y polarized UPW motion in + x direction in free space has a maximum value of 20 (V/m) at a point x=1.5 (m) with the next adjacent minimum at x=2.75 (m) at time t=0 Obtain the wavelength and the frequency of the wave.
Determine the expression for the frequency response H(Omega) of a causal IIR LTI discrete-time system characterized by the input-output relation. where |a|
Calculate number of armature conductors and Calculate the voltage between brushes generated by the armature.
You have a 120 VAC motor pump system. The system will work in a voltage range from 100 to 130 volts. you can count on the minimum voltage from the supplier to be 115 VAC. The wiring will consist of #14 awg which has a resistance of 2.5 ohms/1000 f..
Determine the transfer function for a first order low pass filter with a cutoff frequency of 1000 radians per second and passband gain of 1 using Chebyshev type with 1-dB ripples on the passband.
Revise the complex multiplier datapath of Example 4.13 to include two fixed-point multiplier components instead of just one. How can the control sequence described in Example 4.15 be revised as a consequence to reduce the time taken to perform a c..
What is the fundamental difference between matter & Energy?- Is it-matter is cycled through ecosystems;energy is not.
Reducing the grid spacing by a factor of 2, determine the midpoint temperature and heat transfer rate. Plot the corresponding temperature distribution across the surface exposed to the fluid. Also, plot the 200 and 250°C isotherms.
A 100 Hz electromagnetic wave is propagating down into the sea water with an electric feld intensity of |E| = 1 V /m just beneath the sea surface. a. What is |E| at a depth of 100 m b. What is the time-average Poynting power density just beneath t..
A shunt DC generator has a termianl voltage duringopen-circuit of 127V. When the machine is operating at rated load,the rated terminal voltage is 120V. Find the load current ifthe field resistance is 15 ohms and the armature resistance is 0.02ohms..
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