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A 480-V, 60Hz, 500-hp 0.85-PF-leading eight-pole delta-connected synchronous motor has a synchronous reactance of 0.6 ohms and neglible armature resistance. Ignore its friction, windage and core losses for the purposes of this problem. |Ea| = 480 V when Field Current = 4 A (Assume that |Ea| is directly proportional to the field current).
a.) What is the speed of this motor?
b.) If this motor is initially supplying 500 hp at 0.85 PF lagging, what are Ea and Ia?
c.) How much torque is this motor producing? What is the torque angle? How near is this value to the maximum possible induced torque of the motor for this field current setting?
d.) If field current is increased by 20 percent, what is the new magnitude of the armature current? What is the motor's new power factor
A linear time-invariant system has a transfer function with a direct-current gain equal to 2 and a phase angle of 45°. What is the response of this system to the input x(t) = 4 cos(2t)
Design a state variable two-pole band-pass filter with a geometric center frequency of 2KHz and a 3dB bandwidth of 20 Hz and the tuning resistances need to be 10Kohms each.
A 10 kW, 220 V, dc shunt motor has field and armature reistance of 110 ohms and .20 ohms, respectively. At no-load the motor runs at 1200 rpm and has an armature current of 5 A.
Discuss the sequential nature of the Ripple Carry Output Adder. Why is it actually a sequential operation What are problems associated with this type of sequential design? How would you alleviate them
There are a number of factors and precautions that need to be considered when developing and introducing new technologies to the marketplace. This is especially the case when this could be a technology without a sustainable known history.
In the plane z=5 there is a ring with a 3cm radius with its center on the z axis. The ring has a uniformly distributed charge Q. The origin 0,0,0 is at a small sphere with a mass of 0.5kg and a charge of -Q.
looking for a brief theory on touch voltage, step voltage and ground potential rise (GPR). Should include graphical representation and relevant equations to help in understanding.
A TTL gate with VIH (min) = 2.25 V and VIL (max) = 0.65 V is being driven by a gate with VOH (min) = 2.4 V and VOL (max) = 0.4 V. What is the maximum amplitude of noise spikes that can be tolerated on the inputs in both the HIGH and LOW states
A three-phase transmission line having a reactance of 120 ohms per phase is connected to a wye-connected load whose resistance is 160 ohms per phase. If the supply volatge is 70kV line-to-line, calculate a) The line-to-neutral voltage per phase.
Select an appropriate QAM signal constellation, carrier frequency, and the roll-off factor of a pulse with a raised cosine spectrum that utilizes the entire frequency band. Sketch the system block diagram and the spectrum of the transmitted signal..
a)Write the diffrenece equation for a four-term moving average filter. b) The input x[n] = cos(n pi/6)u[n] is passed through the four-term moving average filter. Solve for the first 5 samples of the output.
Given R = 50Kohm and C = 100nF what is the frequency of oscillation Given a required frequency of oscillation of f = 10kHz and R = 8kohm, what should the value of C be
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