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Consider the 220-V, 1800-r/min dc motor, controlled by a three-phase fully controlled rectifier from a 60-Hz ac source. The armature-circuit resistance and inductance are 1.5 and 30 mH, respectively.
(a) When the motor is operating in continuous conduction, find the ac source voltage required to get rated voltage across the motor terminals.
(b) With the ac source voltage obtained in part (a), compute the motor speed corresponding to α = 60° and Ta = 25 N·m assuming continuous conduction.
(c) Let the motor drive a load whose torque is constant and independent of speed. The minimum value of the load torque is 1.2 N·m.
Calculate the inductance that must be added to the armature circuit to get continuous conduction for all operating points, given that ψ = tan-1 (ωLa/Ra) = 1.5 rad, Tan > 0.006, and all points on the Tan-ωmn plane lie to the right of the boundary between continuous and discontinuous conductions.
Responses to Exponential Excitations Let us consider Aest as a typical exponential excitation in which A is a constant and s is a complex- frequency variablewith a dimension of
Task 1 Use basic circuit theory to convert the "T" circuit below into the equivalent "π". Hint: Remember to disconnect the voltage source and the load. Task 2
Externally Initiated Signals Other than interrupt there are followings externally initiated signals available in 8085 microprocessor.
what is use of capacitance calculation
Consider a GLC parallel circuit excited by i(t) = Ie st in the time domain. Assume no initial inductive current or capacitive voltage at t = 0. Draw the transformed network in the
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Find the resistance of 1 km of copper cable having a diameter of 10 mm if the resistivity of copper is 0.017 x 10 -6 Ωm.
Question: (a) The piecewise linear approximation given in Figure is assumed for the diode in the circuit shown in Figure. Evaluate the diode current ID. (b) The piecew
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