0
Electrical Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
23,056 Questions
A single load doesn't really constitute either a series or a parallel circuit. You could argue that the lamp is in series with the supply, because the same current flows through both. But you could also argue that it is in parallel with the supply, as it shares the same voltage. So the terms 'series' and 'parallel' are only really used when to describe how two or more loads are connected to the supply.
What kva generator to run 15Hp motor?
1HP = 746 watts
15 HP = 11190 watts = 11.19 kW
You would need a generator of at least 13kW.
UPS Distributor for 15 Years.
What winding of a current transformer carry more current?
Primary winding carry more current.
We measure the current in one single wire, so no of turns are 1, in secondary the no of turns are higher. so, obviously it has higher voltage then this wire. so, finally as per the transformer rule the secondary carry lesser current than primary.
What is the principle of operation of universal motor?
Similar to DC permanent magnet motor (which I'm assuming you understand); except the stator is not a permanent magnet but an electromagnet. There are 2 separate coils on the stator, which are connected in series with the brushes and armature:
supply ----- stator segment --- brush - armature - brush --- stator segment ----- return
Since the stator coil segments are wired in series with the armature, reversing the supply will *not* change the direction of rotation; as both magnetic fields will reverse together. (But a reversing switch affecting only the armature *will* reverse the rotation.) And since the motor will always turn in the same direction independent of the supply polarity, this means it will work equally well from DC or AC; and the supply frequency will not affect the rotation speed.
How many kva per leg on 3 phase 240v 50 amp circuit?
Assuming that the figures you supply in your question are line values, and not phase values, and each line current is identical, then you can find the total apparent power (in kV.A ) by applying the following equation:
apparent power = 1.732 VL IL
If, then, by 'per leg', you mean 'per phase', then all you need to do is to divide your answer by 3.
Incidentally, the correct symbols are 'kV.A', not 'kva', 'V' not 'v', and 'A' not 'amp'. lin
How do you plot ohms law graph of potential difference versus current?
The current is represented by the horizontal (x) axis, and the potential difference is represented by the vertical (y) axis.
If the resulting graph is a straight line, then it confirms that the circuit is obeying Ohm's Law. If the resulting graph is a curve, then the circuit does not obey Ohm's Law.
The gradient at any point along of the resulting line represents the resistance of the load for that ratio of voltage to current.
What is the value of the smallest division on an ammeter scale?
what is the value of the smallest division on a ammeter
Is ohm's law applicable to ac or dc and why?
Ohm's Law, in the sense of the ratio of voltage to current giving the value of the circuit's opposition to current flow, applies to both d.c. and to a.c. (interestingly, it also applies to magnetic circuits!).
For d.c., the opposition is resistance, so V/I = R. But for a.c., the opposition is impedance, so V/I = Z.
For a magnetic circuit, the opposition to the formation of magnetic flux is reluctance, so (magnetomotive force/flux) = reluctance.
Is the active power supplied to a motor affected by placing of capacitor in parallel with the motor?
No. The capacitor may improve its power factor by altering the effective reactive power of the machine, thus reducing the current drawn from the supply.
yes
What motor can only operate on alternative current?
The name of the motor that can only operate on alternative current is called the AC motor. The AC motor consists of 2 basic parts with a rotor that is attached to the output shaft.
A TPN MCCB is a three phase neutral molded case circuit breaker. This type of circuit breaker is commonly used in low voltage power distribution systems.
What is the minimum resistance when megohming 13.2kv transformer?
A megger would not be suitable for testing insulation resistance of a 13.2-kV transformer, as the transformer's voltage rating is significantly higher than the output voltage from a megger.
How many poles in a six thousand RPM motor?
It depends on the frequency. At 60 Hertz, with an ordinary two pole synchronous motor, you cannot have an RPM that is greater than 1800, so a six thousand RPM motor has to have a different power supply.
Why do power lines have a slack?
Overhead lines have 'sag' (not 'slack') because the conductors need to be able to expand and contract as the temperature changes. If sag isn't built into the design of the line then, when the conductors contract, they will put undue lateral strain on the supporting poles or towers. It is important that, with maximum sag, the minimum clearance distance between the line conductors and the ground below is always maintained. This safety clearance increases, of course, with line voltage. Allowing for the necessary sag part of the design-process for any overhead line, and achieving it becomes the responsibility of the linesmen when the line is eventually constructed.
How does power factor affect your power bill?
A poor power factor causes the meter to rotate more slowly than it should, so a poor power factor would reduce your bill. Electric utilities compensate for this in commercial services by billing based on power factor, or they install a meter that actually measures power factor.
AnswerEnergy meters 'read' the in-phase component of load current (therefore the load's 'true power' multiplied by time) and, so, are completely unaffected by the power factor of a load. So the power factor of a residential load will have absolutely no effect whatsoever on that residence's 'energy' (not 'power') bill.
Industrial and commercial consumers are billed for 'demand' (their rate of consumption of energy -i.e. the power) as well as energy supplied'. In addition, these consumers are usually penalised if the power factor of their load falls below an agreed value. So power factor does affect the overall bill (but not the energy bill) of industrial consumers.
What is Deregulation of power system and what are the effects of deregulation?
Restructuring the existing power system network to achieve better utilization of electrical energy with reduction of losses
What are the measurements done by digital multimeter?
Digital multimeters are quite clever things. They can measure multiple values. The most common measurements are:
Voltage - measured in volts (v)
Current - measured in amperes (A)
Resistance - measured in ohms (omega greek symbol) Sorry, I don't know how to type it.
What is magnetic line voltage motor starter?
A motor starter is a contactor (heavy duty relay) which acts as a remote-controlled on/off switch between the supply and the motor. Its operating coil is energised through an auxiliary stop/start circuit. It also incorporates overload function which will automatically disconnect the motor in the event of a sustained overload current.
What is does EED electrical processor stand for and where is this located?
in fuel injector system what is EED? where is it located?
How floating condition of synchronous motor occurs?
at the time of starting when syncchronous torque is zero , i.e. when the motor starts with the help of starting torque , the armature current required to produce sync. torque is zero. If V = E(b) i.e. When back emf E(b) equals supply voltage.
