Electrical Engineering Answers

A salient pole synchronous generator has the following per unit parameters;xd=1.2,xq=0.8 ra=00.025. compute the excitation voltage Ef on a per unit basis,when the generator is delivering rated kva at rated voltage and at power factor of 0.8 lagging and 0.8 leading

An iron ring has a mean diameter of 15 cm, a cross-section of 20 cm ^ 2 and a radial air gap of 0.5 mm cut on it. The ring is uniformly wound with 1500 turns of insulated wire and a magnetizing current of 1A produces a flax of 1 mWb in the air gap. Calculate: (i) the reluctance of the magnetic circuit and fii the relative normoabilit of t [5]

 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 ; S_m = 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.?