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A 10-hp, 230-volt shunt-wound motor has rated speed of 1,000 rev/min and full-load efficiency of 86 percent. Armature circuit resistance is 0.26 Ω; field-circuit resistance is 225 Ω. If this motor is operating under rated load and the field flux is very quickly reduced to 50 percent of its normal value, what will be the effect upon counter emf, armature current and torque? What effect will this change have upon the operation of the motor, and what will be its speed when stable operating conditions have been regained?
Design a combinational circuit that converts a 4-bit gray codeto a 4-bit binary number. implement the circuit with exclusive-ORgates
Obtain the (optimal) Boolean expression for each output (Karnaugh maps can be helpful).
A 480 V permanent magnet ae motor is consuming 10 kW at power factor 0.80 lagging. Its speed is 1800 rpm. The winding resistance is 0.5 W per phase. Core losses are 100 W. Mechanical losses arc 250 W.
an initially charged capacitence discharges through a resistance. At one time constant, what percentage of the initial voltage remains what percentage of the initial stored energy remains
a particular electric utility charges customers different rates depending on their daily rate of energy consuption 0.05khw up to 20 kwh and 0.1 kwh for all energy usage above 20 kwh in any 24 hour period.
Does the degree of difficulty change when switch from solving a two loop mesh circuit to a three loop mesh circuit Why and why not
Draw a block diagram of a closed-loop control system.
Find the sketch the convolution of the given pairs of functions. You can use either the integration or the graphical method for convolution. x(t) = 2e-3t sin(2t) u(t) h(t) = u(t) + 4d(t-2) find y(t) = x(t) * h(t)
What kind of EMC filter is needed to reduce emissions from aDC motor. The motor is connected in series with a battery. Anycomponents can be used to design the filter.
The Bandwidth of a broadband signal is 6 MHz and it's maximum frequency is 106Mhz. What is the most likely carrier frequency. WHich of the follwing is not a fundamental characteristics determines the effectiveness of a communication system.
In a circus act, a performer (m = 93kg) stands on a spring (k = 9500 N/m) that is compressed by 1.2 m. The spring is released and the performer launched in the air. Ignore air resistance. A) How high does the performer reach above where the spring ..
A Y-connected load with an impedance of 12 - j15 per phase is connected to a balanced Delta-connected 208-V, 60-Hz, three-phase, positive phase-sequence supply. Determine (a) the line and phase voltages
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