Electrical Engineering Answers

Explain the function of the following bridge circuits:
a) Inductance Bridge
b) Wheatstone Bridge
c) Capacitance Bridge
d) Wein Bridge

In a linear series plate modulated amplifier, the plate supply vottage is 300V and the D.C plate current under unmodulated condition is 20A, the sinusoidal modulating voltage which appears in the plate current of modulated complifier has amplitude of 150V and the unmodulated output Carrier power is 4.5KW, find; (i) modulation index (ii) plate current efficiency (iii) Carrier power under modulated condition (iv) plate dissipation under unmodulated and modulated conditions

Design a simple ohmmeter and explain the conditions of the ohmmeter circuit when the terminals to which the unknown resistance is connected “Open” and "Close"

1. Consider a cube with dimension (1 m)x (1 m) x (1 m). It is anchored at the spatial origin and point (1,1, m. All of its faces are parallel to the Cartesian axes, as shown in cube . This cube is filled with air, and all of its six faces are made of perfect electric conductor. There is no source within the cube and the electric field (in phaser form ) within the cube is
E(Y,Z)=X^sin(2pi y) sin(2pi z) (V/m)
1. What is angular frequency omega
2.what is time dependent expression of the electric field

Design a simple ohmmeter and explain the conditions of the ohmmeter circuit when the terminal to which the unknown resistance is connected "open" and "close".

A voltmeter reads 128.8V when connected across the component if the true value if the voltage is 112.6V calculate
(i) static error
(ii) static correction for the voltmeter
(iii) Relative error.

The resistance of the two coil of a wattmeter are 2200ohms and non-inductive. The load is taking a current of 25A at 200V and 0.7 power factor lagging.
(i) show the ways in which the voltage coil can be connected.
(ii) find the error in the reading of the meter in each case.

A voltmeter having a sensitivity of 1200Q/V and read 100V on it's 220V scale when connected across an unknown resistor in series with a milliameter when the millimeter read 5mA calculate
(i) the apparent resistance of the unknown resistor.
(ii) the actual resistance of the unknown resistor.
(iii) the error due to the loading effect of the meter.

Find the unknown resistance AB when the resistance of the remaining arms are BC=120ohms, CD=110ohms, DA=110ohms, AB=?.

A D.C wheatstone bridge has a 5.0V supply connected between A and C and a galvanometer of resistance 50ohms between point B and D what will be the current through the galvanometer when the resistance in the bridge arms are AB=120ohms, BC=120ohms, CD=120ohms, DA=120ohms.