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Does transformer draw any current when secondary is open? Why? Define voltage regulation of a transformer.Define all day efficiency of a transformer. Why transformers are rated in kVA?
Briefly explain your ideal job as electrical engineer? Why did you select this career? What goals do you have in this career? How do you plan to get these goals?
An AC circuit design for balancing a load in AC circuits. The only power supply availablehas an internal resistance of 75Ω. The load has a resistanceof 600Ω. You want to deliver the maximum power possible tothe load by properly selecting X1 and X2..
An LED is rated at VF=1.6V to 2.0V at IF=20mA. What value of series resistance is needed to limit the LED current to 20mA when this LED is connected to a 32 v peak source (that is, a source having a peak voltage of 32 v)
A 20kW, 250V, self-excited dc shunt generator is driven at its rated speed of 1200rpm and it is delivering rated power at rated terminal voltage. Its armature-circuit resistance is 0.15-ohm, and the field current is 2 A.
The reactance in ohms of a capcitor
The exciting current for a certain 50 kVA, 480-240V, 60 Hz transformer is 2.5 percent of rated current at a phase angle of 79.8 degrees. Sketch the equivelent circuit and phasor diagram for the no-load conditions and assuming operation is in the s..
A 25KVA transformer supplies a load with the following schedule: 8hrs-full load with 0.8 lagging power factor. 4hrs-75% full load at unity power factor. 12hrs-No load. The transformer is energised 24hrs per day and has iron losses of350w.
What is the peak frequency deviation of the FM signal and bandwidth of the FM signal? The signal is received with CNR = 30.0 dB. What is the SNR of the recovered video signal at the radio receiver output?
The mean length of the magnetic path is 1500 mm. The magnet lifts steel plates of negligible reluctance with an effective air-gap of 6 mm at each pole. Draw a sketch of the cross-section through the lifting magnet showing the pole faces, magnetic f..
Draw the circuit diagram for a 4-bit Logical Shift Right using 4:1 Multiplexers and draw a picture of the Memory array, label the Address and Data lines.
Use contraction beginning with a 4-bit adder with carry out to design a 4-bit increment-by-3 circuit with carry out that adds the binary value 0011 to its 4-bit input. The function to be implemented is S = A + 0011.
a circuit consists of three elements in series. a source delivers 90 watts and one of the passive elements absorbs 20 watts. how much power does the third element absorb.
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