A field excitation of 20 A in a certain alternator results in an armature current of 400 A in short circuit and a terminal voltage of 2000 V on open circuit. The magnitude of the internal voltage drop within the machine at a load current of 200 A is
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- Value of series impedance if inductance is 4mH , resistance is 40 ohm and frequency is 50 Hz.QUESTION 3 An inductor and a 330 ohm resistor are connected in series with a function generator. The current is 89.8mA RMS 5kHz. The reactive power is 3.04 var. Find the value of the inductance. O 12mH O 24mH O 6mH O 18mHDetermine the DC currents (la. lc and I) and dc junction voltages (Var Ver and Vca) la-Blank 1 mA, le-Blank 2 mA, I-Blank 3 mA, Var Blank 4 V, Vcr Blank 5 V and VcB - Blank 6 V Use 2 decimal places. Use the following values. VBB= 3V RB= 5kOhms Rc=232 ohms Vcc =18 V BDC=65
- .H.W Show the voltage waveforms across each half of the secondary winding and across RL. • Find the average value of the full-wave rectified voltage in Figure. ● 120 Vrms elller 4:1 D₁ WI RL 1.0 ΚΩThe conversion of an AC to DC Source is by using the A) Commulator B) None of these C Round ring D) Slip ringTrue power can be determined by measuring voltage and current in a. R-L series circuit b. Purely resistive ac circuit c. Purely capacitive circuit d. Purely inductive circuit
- 6. What is the effect of load inductance on the ripple current? 7. i effect of chonnine Bock and boost 8. Wh 9 What chopping 10. At what duty evcle does the load current rinnle current he10. Determine the peak-to-peak ripple and de output voltages in Figure 5. The transformer has a 36 V rms secondary voltage rating, and the line voltage has a frequency of 60 Hz. A R surge 120 Vrms 00000 ellle B Figure 5. www 10 Ω C 100 μF www R₂ 3.3 ΚΩ6. Determine the peak and average power delivered to RL in figure. 2:1 RL 220 N 120 V rms alll lelll
- A moving coil ammeter and a moving iron ammeter are connected in series with arectifier across 110V (r.m.s.) AC supply. The total resistance of the circuit in theconducting direction is 60 ohm and that in the reverse direction may be taken asinfinity. Assuming the waveform of the supply voltage to be sinusoidal, calculate thereadings in each ammeterVery urgent. Draw the waveforms of the voltage at the load (RL) end, the voltage at the R end, the voltage at the L end and the current 1 when the switch K is turned to position 2 after a long enough time.What is the accurate LVDT output voltage when the core is at the centre position? a. 5.22V b. 2.5V c. 0 d. 1.2V