Electrical Engineering Answers

)Derive the torque equation for a D.C. motor.

A4-pole d.c. shunt generator with lap connected armature

has field and armature resistance of 802 and 0.12 respectiv ely. It supplies power to 50 lamps rated for 100V,60W

A receiver with a 75-Ω input resistance operates at a temperature of 31°C. The received signal is at 89 MHz with a bandwidth of 6 MHz. The received signal voltage of 8.3 μV is applied to an amplifier with a noise figure of 2.8 dB. Find (a) the input noise power, (b) the input signal power, (c) S/N, in decibels, (d) the noise factor and S/N of the amplifier, and (e) the noise temperature of the amplifier.

For each of mechanical system 

i) Draw the f-v analogous electrical circuit 

ii) Draw the f-i analogous electrical circuit 

iii) Write the equation of motions in term of mechanical quantities 

Fig: 01 

Fig : 02 

Mention the effects of electric current

Let the volume charge density in the fig below be given as ρ_v=ρ_v0 (x/a) e^(-|x|a) (a) Determine ρ_vmax ⁡〖and ρ_(vmin ) 〗 and their locations. (b) find Ex and V(x) If V (0) =0 and Ex goes to 0 as x approaches infinity.

Derive an expression for the instantaneous current, instantaneous power and average power drawn by a pure inductive circuit on application of a sinusoidal voltage and show that the current lags behind the applied voltage by quarter of a cycle.

Implement the function F with the following two level forms

i) NAND-AND

ii) AND-NOR

F(A,B,C,D) = P(0,1,2,3,4,8,9,12).

For the network

a. Write the nodal equations for the networks in Figure given.

b. Solve for the nodal voltages.

c. Find the magnitude and polarity of the voltage across each resistor.

The following data are given in connection with the series - parallel circuit of Figure 1; E = 97.5volts, R1= 18 ohms, R2 = 9 ohms, R3= 16 ohms, R4= 14 ohms, R5 =7 ohms, I₂=2.5 amp. Calculate (a) the resistance of R6, (b) the total equivalent resistance of the circuit, (c) the total power.