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A salient-pole synchronous machine is connected to an infinite bus whose voltage is kept constant at 1.05 p.u. The direct axis reactance of the machine is 0.95 p.u. and the quadrature axis reactance is 0.4 p.u. respectively. Neglect armature reaction. The table given relates to two operating conditions of the machine. Complete the table.
The armature is stationary so that the length of the air gaps, g=10mm, is fixed. A direct current passing through the coil produces flux density of 1.2 T in the gaps. assumeπr=4,000 for sheet steel. Determine a. The coil current.
The series combination of a 4=mu F and a 3mu F capacitor is in series with the parallel combination of a 2 mu F, a 1 ? mu F, and a C - mu F capacitor, (a) What is the maximum possible value for the equivalent capacitance of the five capacitors
The nameplate on a 460-V 50 hp 60 Hz four pole motor indicatesthat the speed at rated load is 1760 r/min. assume the motor to beat operating load. a) What is the slip of the rotor b)what is the frequency of the rotor currents
Begin with a breadboard, wire, an RGB LED and some resistors. Using the forward voltages given in the RGB LED datasheet, calculate the correct current-limiting resistors needed to light each color of the LED (assuming VDD = +5V).
Design a second-order banpass filter with center frequency f=10. The gain should be zero at t=0 and t= 8. Select poles at -a ±j10. Explain the influence of a on the frequency response.
A squirrel-cage induction motor has a fullload slip of 4% and a blocked-rotor current of six times the full-load current. Find the percentage of tapping of the autotransformer starter to give full-load torque on starting and the line current as a ..
A highway curve of radius 500 m is designed for traffic moving at a speed of 90 km/hr. What is the correct banking angle of the road
A 4-pole, 50 Hz scharg motor, running at no-load, gives minimum and maximum speeds of 500 and 2500 r.p.m. respectively, for brush separation of 180 electrical degree (i.e. one pole pitch).
Without using the Routh-Hurwitz criterion, determine if the following systems are asymptotically stable. marginally stable, or unstable. In each case, the closed-loop system transfer function is given.
A (bad) solution analogous to that in Figure E14.30(b) could be employed, requiring two circular SRs. As in the exercise above, devise a better circuit that solves this problem.
A steel plate, 160 mm wide and 8 mm thick, is bent to form the channel shown. Knowing that the vertical load P acts at a point in the midplane of the web of the channel,
Calculate the capacitive reactance/ph such that the load power factor is increased to 0.98 lag and calculate the percentage reduction in line current with this value of capacitive reactance in circuit.
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