Electrical Engineering

The compound DC motor has the advantage of both, constant speed feature of the shunt motor and the capability to handle high starting torque feature of series motor.

the background is directed to the negative & positive impact of tourism. when the tourism have a adequate innovation about planning strategies, the entrepreneur,or business man involved it, they can analyze each sector of tourism industry.

The transformer will act as a step down transformer in the ratio of 240 to 208. This will reduce the 208 input to 180.

Copper loss varies with the load.

forward bias 0 volts, reverse bias infinity volts.

The output power of an amplifier is greater than its input power, whereas the output power of a transformer is almost the same as its input power. In other words, an amplifier increases acts to increase power, whereas a transformer only increases voltage.

There is a limit to the physical size of an alternator, as the output voltage is determined by the number of turns of the windings that can be installed in its stator. This limits the output voltage to around 25-30 kV which is far too low for transmission purposes (in the UK, 400 kV). Fortunately, this doesn't really matter, thanks to transformers.

An electric current (symbol: I) is a very slow drift of charge carriers (electrons, in metallic conductors), and is measured in amperes (symbol: A). An ampere is defined in terms of the 'magnetic effect' of an electric current, that is the force of attraction or repulsion between two, parallel, conductors due to the interaction of their magnetic fields. An instrument used to measure electric current is called an 'ammeter'.

The principle of the DFIG is that rotor windings are connected to the grid via slip rings and back-to-back voltage source converter that controls both the rotor and the grid currents. Thus rotor frequency can freely differ from the grid frequency (50 or 60 Hz). By using the converter to control the rotor currents, it is possible to adjust the active and reactive power fed to the grid from the stator independently of the generator's turning speed.

To do a motor solo run test you need to connect the motor to a power supply. Next, you observe the motor's vibration, temperature, and sounds.

The amount of energy transferred from the steam is a function of the temperature difference between the input and output of the turbine. Also, superheating the steam ensures that there are no water molecules that can damage the turbine blades.

This is the current flowing in the primary circuit when full-load current flows in the secondary circuit.

It isn't. It's the other way around. The line voltage is 1.732 times the phase voltage. The figure results when you vectorially add the relevant phase voltages.

0.0547 ohms/km - maximum DC resistance at 20'C. Britsh Standards.

Because it is the same current, as you can determine by examining a circuit diagram of a star connection.

Programmable Logic Controller (PLC) is widely used in Industrial automation system. It has a power supply, memory, processor and input output cards. Field signal are connected to INput output devices

A bushing is a hollow insulator, used with transformers and circuit breakers. It provides a means by which an energised conductor can pass from the outside to the inside of the transformer or circuit breaker.

23

All residential loads are connected in parallel, so that they share the same supply voltage, which is necessary for them to develop their rated power outputs.

Because the total current is divided between the two components. For example, if the current was one amp, and you connected two bulbs in series, ech bulb would get half an amp of current. As brightness is proportional to current, this means they glow more dimly.

The superposition theorem (not 'super position'!) is used to solve complex circuit -typically a load with two voltage sources. It enables the currents through, and the voltage drops across, the various components to be calculated and, therefore, the power of each component can be determined.

The 0.8 Power Factor provided by generator manufacturers is not the load power factor, but it is the nominal power factor used to calculate the kW output of an engine to supply the power for a particular alternator kVA output. Alternators are therefore designed to supply their rated kVA at 0.8 lagging power factor.

HT metering Kiosk is one which has to install between DP structure and HT panel if the distance between them was more than 15 mtrs to reduce voltage drop........