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What is the total modulation index if several signals are modulated by same carrier?
A step voltage V(t) = 100 u(t) is applied to a series RLC circuit with
L=10H, R=2ohm and C= 5F. The initial current in the circuit is zero but
there is an initial voltage of 50V on the capacitor in a direction which
opposes the applied source. Formulate the expressions for the current
in the circuit.
For the DC electromagnet circuit, the magnetic flux value is given to be 5.10-4 Wb . Find the winding current, given the following values: w= 1000 ; Lm1 = 50 cm; Lm2 = 10 cm ; Sm = 10 cm3 ;
A 10 MF capacitor is plugged in to a 110 V-RMS 60 Hz voltage source with an ammeter in series
What is the average power dissipation in an RLC series circuit with R=10 ohm, L=0.1 H, C=10 MF, when driven at resonance by 100 V-RMS source
A vessel of volume 0.2m3 contained N2 at 1.013 bar. 15oC. If 0.2kg of N2 is now pumped into the vessel, calculate the new pressure when the vessel has returned to its initial temperature. The molecular weight of N2 is 28kg/kmol.
Why percentage modulation is always less than 100 % in case of A.M.?
In a three phase power system line to line fault happened between phase a and c :
A) write the fault conditions in phase domain
b) derive the fault condition in sequence domaine. show all necessary steps. it must be noted that ABC positive phase sequence has to be used
C) draw the sequence networks.
The synchronous generator in Figure 7.3 is operating at rated MVA, 0.95 pf. lagging and at 5% above rated voltage when a bolted three-phase short cir- cuit occurs at bus 1. Calculate the per-unit values of (a) subtransient fault current; (b) subtransient generator and motor currents, neglecting prefault current; and (c) subtransient generator and motor currents including prefault current. FIGURE 7.3 2 Single-line diagram ofa (G synchronous generator feeding a synchronous 100 MVA 138 kVY/13.8 kV Δ X = 0.10 100 MVA 100 MVA 100 MVA 13.8 kV X"0.20 motor 13.8 kV 13.8 kV A/138 kVY X"0.15 X0.10
