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Why trefoil formation for single core cable?
Voltages are induced in the sheath of cables running in parallel which result in circulating currents flowing in the sheaths. The distances between single core cables running in parallel determine the voltages induced. With single core cables in trefoil formation (touching each other) the distances between the cables are minimum and thus the voltages induced are minimised and hence the circulating currents.The circulating currents cause localised heating.
How is the induced voltage of separately excited dc generator affected if the exciting current is reduced?
In a separately excited DC generator, the induced voltage is directly related to the magnetic field strength produced by the field winding, which is influenced by the exciting current. If the exciting current is reduced, the magnetic field strength decreases, leading to a reduction in the induced voltage. Consequently, the output voltage of the generator will decrease as the field strength diminishes, assuming all other factors remain constant.
How do you locate the neutral brush position in a dc motor?
leave the brushes of the motor at the position where the induced voltage is zero
What is the principle of a dc generator action?
A DC generator operates on the principle of electromagnetic induction, where mechanical energy is converted into electrical energy. When a conductor, such as a coil of wire, moves through a magnetic field, an electromotive force (EMF) is induced in the conductor according to Faraday's law of induction. This induced EMF generates direct current (DC) as the coil rotates within the magnetic field, typically created by permanent magnets or electromagnets. The direction of the induced current is determined by the orientation of the magnetic field and the motion of the conductor.
What is the difference between a DC motor and a generator in terms of EMF?
During the operation of a DC motor, EMF is created across its terminals using an external source. Whereas, in a DC generator EMF is created across its terminal based on principle of dynamically induced EMF. So talking in terms of EMF, in DC motor EMF is consumed by the motor coil and utilized to rotate the axle. On the other hand, in DC generator EMF developed across coil is transfered to a load or a battery and consumed by them.
Why trefoil formation for single core cable?
Voltages are induced in the sheath of cables running in parallel which result in circulating currents flowing in the sheaths. The distances between single core cables running in parallel determine the voltages induced. With single core cables in trefoil formation (touching each other) the distances between the cables are minimum and thus the voltages induced are minimised and hence the circulating currents.The circulating currents cause localised heating.
How is the induced voltage of separately excited dc generator affected if the speed increases?
as speed increases, induced voltage increases
What component of a motor changes induced AC voltage into a pulsating DC?
its commutator..which converts ac produced by and motor to pulsating dc ... more the commutator divide more accurate dc..means less pulse in dc
What are the power requirements, and how do they rank with other similar electric drills?
Electric drills typically require 60-120V DC grounded power cables.
How is the induced voltage of separately excited dc generator affected if the exciting current is reduced?
In a separately excited DC generator, the induced voltage is directly related to the magnetic field strength produced by the field winding, which is influenced by the exciting current. If the exciting current is reduced, the magnetic field strength decreases, leading to a reduction in the induced voltage. Consequently, the output voltage of the generator will decrease as the field strength diminishes, assuming all other factors remain constant.
What are the differences between AC and DC cables, and how do they impact the performance of electronic devices?
AC cables carry alternating current, which changes direction periodically, while DC cables carry direct current, which flows in one direction. The choice of AC or DC cable can impact the performance of electronic devices based on their power requirements and the type of current they are designed to operate with. Devices that require AC power will not function properly with DC cables, and vice versa. It is important to use the correct type of cable to ensure the optimal performance and safety of electronic devices.
What are the 'cables' referred to in Wikileaks?
The cables are memos containing confidential communications between the embassies in countries throughout the world and the State Department in Washington DC.
What is the primary purpose of DC and AC solar cable How do I choose a good solar cable supplier?
The primary purpose of DC and AC solar cables is to safely and efficiently transmit electrical power generated by solar panels, with DC cables carrying direct current from the panels to the inverter and AC cables transporting alternating current from the inverter to the electrical grid or consumption points. Vazpo's photovoltaic cables have the advantages of weather resistance, UV resistance, and tensile resistance.(www. vazpocable. com)
How do you locate the neutral brush position in a dc motor?
leave the brushes of the motor at the position where the induced voltage is zero
Can a constant dc current can induce a steady state voltage in a transformer?
No, the current has to change for a voltage to be induced in the transformer.
Why is brushes placed at MNA in a dc generator?
to avoid sparking ,since their is no e.m.f induced in magnetic neutral axis.
What types of Polycab wires and cables are available?
Polycab offers a wide range of wires and cables, including house wires, power cables, control cables, solar cables, and networking cables. If you're looking for quality and trusted service, Manibhadra Enterprises is a great choice
