What Is Electrical Machinery Used For?


Electric motor‐driven systems used 68% of this total electricity for essential energy intensive industrial processes such as refrigeration, pumps, fans, compressors, materials handling, materials processing, and facility HVAC systems.



What is the value of space factor?

Explanation: 10 / (30+kV) denotes the empirical value of window space factor for rating between 50-200 kilo-volt-amp. 12 / (30+kV) is the window space factor for transformers having rating around 1000 kVA. 10. The area of the window depends on the window space factor.


What are the factors affecting window space factor?

The window space factor is defined as the ratio of copper area in the window to total window area. It depends upon the relative amounts of insulation and copper provided, which in turn depends upon the voltage rating and output of transformers.


What is the meaning of pole pitch?

The pole pitch is defined as the peripheral distance between centers of two adjacent poles in dc machine. This distance is measured in terms of armature slots or armature conductors come between two adjacent pole centers. A pole pitch in the electrical machine is equal to 180° electrical.


What is the maximum current per conductor for helical winding?

160-10000 kVA is used for helical winding.


What is the principle of electrical machine?

The principle of electromechanical energy conversion is perhaps the cornerstone of machine analysis. This theory allows us to establish an expression of electromagnetic torque in terms of machine variables, generally the currents and the displacement of the mechanical system.


What are the basics of electrical machines?

The electric machines are of three main types, transformer, generator, and motor. Electrical Transformer: In the transformer, both input and output are electrical power. Electrical Generator: In a generator, the input is mechanical power and the output is electrical power.


What is breaker timing test?

Because of their key role, circuit breakers are periodically tested. One of the earliest and most successful test methods was the timing test, which consists of measuring the mechanical operation time of the breakers contacts. Timing tests will always be important to prevent damages of circuit breaker.


What is electrical machinery used for?

Electric motor‐driven systems used 68% of this total electricity for essential energy intensive industrial processes such as refrigeration, pumps, fans, compressors, materials handling, materials processing, and facility HVAC systems.


What does the window space factor depend on *?

Clarification: Window space factor totally depends on the insulation of the machine. It also depends on the copper windings provided. 3.


What will be the range of stacking factor?

The rule of thumb is based on stacking factor estimates in a range between 0.003mm and 0.8mm. For lamination sheets thicker or thinner than these values, the rule of thumb might not be applicable.


What is repetition of design?

In graphic design, repetition is the act of repeating the same or similar design elements and making them come together as a cohesive whole. This repetition can be done by repeating the same design elements in your design, like colors, fonts, lines, shapes, sizes, and texture, among others.


What is cross over winding?

Crossover Windings

These windings are used for high voltage windings of the small transformers. The conductors of these windings are paper covered strips or round wires. The windings help reduce the voltage between adjacent layers as they are divided into a number of coils.


What are the types rotating electrical machines?

Rotating electrical machines are also of two types: DC and AC machines. Electrical machines are widely used. In DC machines the stator is used as a field and the rotor is used as an armature, while reverse is the case for AC machines, that is, synchronous generators and synchronous motors.


What is the usual value of stacking factor?

Stacking factor is the ratio of iron content in the laminated varnished core by volume. Its value is about 90 per cent, that is, 10 per cent volume is occupied by varnish and air.


What design consideration should be undertaken while designing a machine?

Some of the important characteristics of materials are strength, durability, flexibility, weight, resistance to heat and corrosion, ability to cast, welded or hardened, machinability, electrical conductivity, etc.


What is meant by stacking factor?

The stacking factor (also lamination factor or space factor) is a measure used in electrical transformer design and some other electrical machines. It is the ratio of the effective cross-sectional area of the transformer core to the physical cross-sectional area of the transformer core.


How is the efficiency of an electrical machine related to its operating costs Mcq?

Explanation: A machine with lower efficiency has more losses, and therefore increased operating cost.


What are 3 examples of constraints in engineering?

For illustrative purposes only, examples of possible constraints include accessibility, aesthetics, codes, constructability, cost, ergonomics, extensibility, functionality, interoperability, legal considerations, maintainability, manufacturability, marketability, policy, regulations, schedule, standards, sustainability


How do you make a power transformer?

Designing a transformer using an example:

  1. Sec.Volt-Amps(SVA) = Vs * Is = 60 * 4.44 =266.4VA.
  2. Prim.Volt-Amps(PVA) = SVA / 0.9 = 296.00VA.
  3. Prim.Voltage (Vp) = V2 / (n2/n1) = 60/0.5= 120V.
  4. Prim.current (Ip) = PVA/Vp = 296.0/ 120 = 2.467A.
  5. Core Area(CA) = 1.15 * sqrt(PVA) = 1.15 * sqrt(296) = 19.785 cm²


What is lap and wave winding?

Wave Winding. The lap winding can be defined as a coil which can be lap back toward the succeeding coil. The wave winding can be defined as the loop of the winding can form the signal shape. The connection of the lap winding is, the armature coil end is connected to the nearby section on the commutators.


Dated : 21-Jun-2022

Category : Education

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