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Electrical Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
23,056 Questions
What happens to the output voltage of a rectifier if the capacitor becomes very leaky?
A leaky capacitor will act like a load therefore decreasing the DC and increasing ripple eventually the capacitor it will self destruct because of heating probaly taking out the rectifiers as well.
Creepage distance in insulators?
It is the shortest distance between the conductors measured along with the surface of insulators.
Explain the basic principle of working of radio?
Radio is the transmission of signals, by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space.
Where is the Jetta 96 starter relay?
If automatic: Above de panel of relay, in the corner, with number 175 on it.
What is an elevator shunt trip test?
An elevator shunt trip test checks the heat detector placement. It also monitors power and wiring diagram of an elevator.
What is the basic difference between s7-200 and s7-300?
S7-200
The S7-200 is referred to as a micro PLC because of its small size. The S7-200 has a brick design which means that the power supply and I/O are on-board. The S7-200 can be used on smaller, stand-alone applications such as elevators, car washes, or mixing machines. It can also be used on more complex industrial applications such as bottling and packaging machines.
S7-300
The S7-300 is used in more complex applications that support a greater number of I/O points. S7-300 is modular and expandable. The power supply and I/O consist of separate modules connected to the CPU. It is chosen often by the industries that have future expansion plans.
Why Disconnect switch should be placed before current transformer cabinet?
Usually disconnects are placed around any equipment that you may have to do maintenance on in the future and don't want to have to take larger outages than necessary. If the current transformer is on a substation bus, and you don't want to take an outage to that bus, but would like to take a look at the CT's, you should put disconnects around it to allow such maintenance activities.
Is there a current in star connected transformer in neutral side?
For a perfectly balanced load, with identical loads connected between each line conductor and the neutral conductor, there should be no neutral current. This is because the vector sum of three identical current, displaced by 120o, is zero.
However, for an unbalanced load, there will always be a neutral current because the vector sum of the currents will not cancell.
Calculate the voltage of a battery that provides 20 joules of energy to 5 coulombs of charge?
calulate the voltage of a battery that provides 20 joules of energy to every 5 coulombs of charge
Why does the cathode gain in mass during the purification of copper by electrolysis?
Because the cathode is where reduction takes place, meaning the it gains electrons. When it gains electrons, it attracts the copper cation (Cu^2+) and as the copper cation reaches the cathode, it picks up the electrons from the cathode, and is deposited as solid copper (Cu). This results in the cathode gaining mass over time.
May power amplifier a voltage amplifier?
A power amplifier may also boost voltage; in audio equipment, power amplifiers often have a dial on the front that is used to control the input voltage gain.
A simple power amplifier is composed of a single transistor; this type of configuration cannot provide voltage amplification as well. A voltage amplifier stage is needed. So the above example of an audio power amplifier is actually a voltage amplifier stage, followed by one or more power amplifier stages.
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What are the advantage and disadvantage of full wave rectifier with filtre?
either less ripple or ability to use smaller filter
What are the ideal op-amp approximations?
Ideal op amp approximations: -no current goes into the positive or negative input of the op amp. -The open loop gain is infinite. -Voltage at positive input is the same as the negative input.
NO, in order to 'charge' a battery, the charging device must be at a higher voltage than the battery in order for current to flow to the battery.
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A choke, as it relates to firearms, is a narrowing of the end of the shotgun barrel.
This narrowing can be greater or smaller. Chokes that are smaller than the bore to a greater degree are called tight chokes.
Choke affects the shot pattern. Different chokes act differently with different loads and shot types.
Choke tubes are steel tubes with threads on the outside and one end having the same diameter as the bore and the other end being narrower to various degrees. These tubes are screwed into the end of the shotgun barrel to vary the choke. This provides shooters with more flexibility in using their guns for different types of shooting and different loads.
What is ecc in electrical cabling?
This is the earth continuity conductor, which links the earth busbar in the consumer unit to the earth terminal provided by the supply company.
Is the wire coil in a transformer made of an alloy?
Most transformers have coils made of pure copper. This copper is really pure, and it is not an alloy.
Certainly we know of situations where other materials are used to wind the cores of transformers. In superconcuctive matnets, the coils are alloys or composite materials that have specific superconductive properties. And don't forget the coils in the calutrons used at Oak Ridge National Laboratory to enhance uranium diring World War 2. They were made of silver that was borrowed by the ton from reserves at Fort Knox!
By and large, most transformers we encounter will be wound with pure copper wire. It might be worth noting that recycled copper is not generally used to make copper wire as it is not pure enough. Virgin copper is generally the best choice for electrical wire, and recycled copper works very well for copper pipes and copper tubing.
What is internal impedence of digital multimeter?
A: [practically all commercial digital meter have a 11 mega ohm input impedance but there are special meters that can be used to measure leakage current and they have impedance high enough to measure nano amps. Even an oscilloscope will have these kinds of impedance such that the reading is not influenced by external loading
What are the possible causes if load is not same on all the three phases?
You may have single phase loads on one winding, turn to turn faults within one winding, the three phase voltage applied to the transformer may not be balanced, and so on.
If you have only three phase loads attached, and the load impedance is not balanced, you may have a partially failed piece of equipment. Part of one of the motor windings may be shorted out, for example.
How many watts does a 3 phase 20 hp motor use?
You would need to know the efficiency of the motor to determine its input power, which would, of course, exceed its output power of (20 x 746 =) 14.92 kW.
