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Q. A 7.5-hp, 250-V, 1800-r/min shuntmotor, having a full-load line current of 26 A, is started with a four-point starter. The resistance of the armature circuit, including the interpole winding, is 0.48 ; and the resistance of the shunt-field circuit, including the field rheostat, is 350 . The resistances of the steps in the starting resistor are 2.24, 1.47, 0.95, 0.62, 0.40, and 0.26 , in the order in which they are successively cut out.When the armature current is dropped to its rated value, the starting box is switched to the next point, thus eliminating a step in the starting resistance.
Neglecting field-current changes, armature reaction, and armature inductance, find the initial and final values of the armature current and speed corresponding to each step.
Q. A signal with bandwidth of 100 MHz is to be transmitted 40 km by LOS radio transmission. Taking B/fc = 1/30, and using a circular-aperture parabolic dish with 50-cm radius at ea
What''s the formula for the VB2'' in a UJT?
Q. A practical current source is represented by an ideal current source of 200 mA along with a shunt internal source resistance of 12 k. Determine the percentage drop in load curr
A permanent magnet DC motor is being considered for use as a drive motor for a vehicle. The motor is known to have the following properties No load speed @ 100 V = 2000 rpm torq
One of the simplest circuits is the asynchronous or ' ripple' counter. Below is shown the circuit diagram of a simple 3 stage ripple counter. The operation of this circuit
dear sir, when i am going to simulate my model in matlab i am getting the following error : the derived input for the integrator is inf or nan at time xxxxx. try to reduce the step
There is a limitation on the size of data. Most Microprocessor does not maintain floating-point operations.
With the development of cheap and reliable operational amplifiers the need to design amplifier circuits has disappeared. However it is still necessary to utilise these devices in a
electrical project produse eneargy desingn
What are the applications for solar PV system? Explain one of the application with neat schematic diagram.
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