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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
Current will be decreased because of the resistance of the ammeter added to the circuit's resistance. In other words total resistance increases.
Should a starting windings in the split phase motor fail to energise what would be the result?
what will be the result if the starting winding in a split phase motor fails
All resistances will emit heat energy when a current flows. The heat production rate (or power) can be found by any of these formulas:
Power = Current * Voltage
Power = Current2 * Resistance
Power = Voltage2 / Resistance.
Power is given in Watts when Current is in Amps, Voltage in Volts, and Resistance in Ohms.
A wattmeter measures the supply voltage and the in-phase component of the load current and, therefore, its reading is unaffected by the power factor of the load. In other words, it will always read true power regardless of power factor.
If it is reading backwards, it is because the polarity markings have been ignored and either the voltage coil or the current coil have been connected the wrong way around.
Why generator rotating anticlockwise?
Its all a matter of perspective. If you look at one end of the generator and note that it is turning anticlockwise, then it is true that it will be turning clockwise as viewed from the other end.
What components are placed in an electrical circuit to control the amount of resistance in circuit?
resistors, variable potentiometers
What is the capacitor and how many types?
A capacitor is a circuit component that stores energy in the electric field set up between its plates.
Capacitors are named after the dielectric used to separate their plates (e.g. 'mica' capacitor), and there are lots of different types of dielectric used (too many to list), so there are a corresponding number of types of capacitor.
But you can also categorise a capacitor as being 'polarised' or 'non-polarised'; electrolytic capacitors are 'polarised', which means that they must be connected into a circuit while taking into account the polarity of their terminals.
Finally, you can categorise them as being 'fixed value' or 'variable'.
Earth Leakage Circuit Breaker(ELCB) was given to a device that breaks the power supply when a fixed amount of current ,say 25-40 milli amperes flow through the earth line. The MCB (Miniature Circuit Breaker) is a device designed to protect a circuit's wiring from the serious damage which would be caused if it has to carry a current which is too high for the diameter of the its wire
What does inductive load effect on High Voltage transmission line?
the inductive load which is generally use in high voltage transmission line known as transformer. the transformer transform the high voltage to low voltage.
How can convert active power to reactive power and apparent power too?
'Active' power describes the rate at which energy is delivered to a load and is permanently lost, and is expressed in watts. 'Reactive' power describes the rate at which energy is alternately stored within a magnetic or electric field and returned to the supply every quarter-cycle, and is expressed in reactive volt amperes.
You cannot 'convert' one to the other.
'Apparent' power is the vectorial sum of active power and reactive power, and is expressed in volt amperes.
Electrical stress is nothing but the stree imposed by electricity at any point.. due to insulation breakdown or induction or atmospheric conditions. Usually its caused on the live conductor due to other conductor or insulation.
Have u ever heard hissing noice from a electric pole. Its a kind of electric stree
Can registered electrical engineer could sign on electrical plan?
RA 7920:
Sec. 31.
Field of Practice. - The field of practice for professional electricalengineers, registered electrical engineers, and registered master electricians
shall be as follows:
(a) A professional electrical engineer's field of practice includes the sole
authority to seal electrical plans, etc., and to practice electrical engineering
in its full scope as defined in this Act;
(b) A registered electrical engineer's field of practice includes charge or
supervision of operation and maintenance of electrical equipment in power
plants, industrial plants, watercraft, electric locomotive, and others;
manufacture and repair of electrical supply and utilization equipment
including switchboards, power transformers, generators, motors,
apparatus, and others; teaching of electrical subjects; and sale and
distribution of electrical equipment and systems requiring engineering
circulations or application of engineering data; and
(c) A registered master electrician's field of practice includes the
installation, wiring, operation, maintenance and repair of electrical
machinery, equipment and devices, in residential, commercial,
institutional, commercial and industrial buildings, in power plants,
substations, watercrafts, electric locomotives, and the like: Provided, That
if the installation or the machinery is rated in excess of five hundred
kilovolt-amperes (500 Kva), or in excess of six hundred volts (600 V) the
work shall be under the supervision of a professional electrical engineer or
a registered electrical engineer.
What is diversity factor in electrical installation?
When you are determining the electrical load of certain appliances, such as a stove (range), it's unnecessary to add together ALL the individual heating loads (oven, rings, etc.) because, under most circumstances, they are rarely operated altogether at the same time. For example, the IEE Regulations (for the UK) specify that, when determining the total load for a 'cooking appliance', the calculated load current should be 10 A of the overall rated current, plus 50% of the rated current, plus 5 A if the appliance has a socket outlet incorporated.
What are shading bands and why are they provided in energy meters?
shading bands are used to increase the magnetic field in shunt magnet in single phase energy meter. They also used for reduce the friction error.
What happens to current in a parellel circuit if a resistor load increases?
Your question needs rephrasing; as it stands, it makes no sense.
Why galvanometer are used in electronic instruments that measures low current and voltage?
The galvanometer is very sensitive.
What is the power factor when the current and voltage are in phase?
The power factor of a load is the cosine of the angle by which the load current lags or leads the supply voltage. So if they are in phase (phase angle is zero), then the power factor must be unity (1).
The rated current is the maximum current that can be drawn in normal continuous use, without any reduction in the lifetime of the device.
What are the functions of Breather Conservator and Ventpipe?
A conservator is an oil tank, located above the transformer, whose function is to ensure that the oil level remains above the transformer, while allowing it to expand and contract with temperature. The breather/vent pipe allows air to be displaced from the conservator when the level rises, and to draw back in when the oil level falls.
Where are the main windings of an AC induction motor situated?
Front and rear.
What is LV winding of a transformer?
For a step-down transformer, its secondary winding will be the LV winding. For a step-up transformer, its primary winding will be its LV winding.
