Manish Kumar Saini has Published 922 Answers

Solid State Motor Starters

Manish Kumar Saini

Manish Kumar Saini

Updated on 05-Jul-2021 09:28:30

Basic Theory of Solid State StartersA solid state starter (or soft starter) controls the starting torque and current of an AC motor electronically by controlling the applied voltage. A solid state motor starter is made of solid state devices like SCRs or triac, which allows the current flow when they ... Read More

Single Phase Transformer – Construction and Working Principle

Manish Kumar Saini

Manish Kumar Saini

Updated on 05-Jul-2021 09:21:29

Construction of Single Phase TransformerA single phase transformer consists of two windings viz. primary winding and secondary winding put on a magnetic core. The magnetic core is made from thin sheets (called laminations) of high graded silicon steel and provides a definite path to the magnetic flux. These laminations reduce the ... Read More

Single Phase Motors Characteristics

Manish Kumar Saini

Manish Kumar Saini

Updated on 05-Jul-2021 09:15:00

There are various types of single phase motor. Depending upon their construction and operation, they are having different characteristics. Let us discuss characteristics of each single phase motor one-by-one.Characteristics of Split-Phase Induction MotorThe single phase split-phase induction motor has following characteristics −The starting torque of split phase induction motor is ... Read More

How to measure medium resistances? (Resistance Measurement Methods)

Manish Kumar Saini

Manish Kumar Saini

Updated on 05-Jul-2021 09:13:23

The resistances that range from about 1Ω to about 100 kΩ are classified as medium resistances. The resistances of most of electrical apparatus are the examples of medium resistances.Measurement of Medium ResistancesTo measure the medium resistances following methods are used −Ammeter-Voltmeter MethodSubstitution MethodWheatstone BridgeCarey-Foster Slide-Wire Bridge Method.Ammeter-Voltmeter MethodIn this method, current ... Read More

How to measure low resistances? (Resistance Measurement Methods)

Manish Kumar Saini

Manish Kumar Saini

Updated on 05-Jul-2021 09:04:16

The resistances of the values of less than or equal to 1 Ω are classified as low resistances. For example, the resistances of armatures and series windings of large machines, ammeter shunts, contacts, etc.Measurement of Low ResistancesFor the measurement of low resistances, the following methods are used −Ammeter-Voltmeter MethodPotentiometer MethodKelvin Double ... Read More

How to measure high resistances? (Resistance Measurement Methods)

Manish Kumar Saini

Manish Kumar Saini

Updated on 05-Jul-2021 08:58:50

Resistances of the order of 100 kΩ and upwards are classified as high resistances. For example, insulation resistances.Measurement of High ResistancesThe following methods are employed for the measurement of high resistances −Direct Deflection MethodLoss of Charge MethodMegohm BridgeMeggerDirect Deflection MethodIn this method, a very sensitive and high resistance (more than ... Read More

Resistance and Impedance in an AC Circuit

Manish Kumar Saini

Manish Kumar Saini

Updated on 05-Jul-2021 08:52:36

Resistance in an AC CircuitConsider the circuit diagram, containing an AC sinusoidal voltage source and an unknown passive element (K). The element K will be a resistance, only if the voltage across it and the current flowing through it, are in phase with each other.ExplanationLet the equation for alternating voltage ... Read More

Purpose of Grounding the Utility Power Distribution

Manish Kumar Saini

Manish Kumar Saini

Updated on 05-Jul-2021 08:48:20

One of the remarkable discoveries in the field of electrical engineering is the grounding of electric current. In an electric circuit, there be an active wire, which supplies current and a neutral wire, which carries that current back. An additional grounding wire can be attached to outlets and other electrical ... Read More

Power Triangle and Power Factor in AC Circuits

Manish Kumar Saini

Manish Kumar Saini

Updated on 05-Jul-2021 08:45:43

Power in AC circuitActive Power (P)The product of voltage (RMS) and current (RMS) with the cosine of the angle between them, in an AC circuit is termed as active power. It is measured in watts (W). For a pure inductive and pure capacitive circuit, the active power being zero.Active Power, ... Read More

Power Transformer Characteristics

Manish Kumar Saini

Manish Kumar Saini

Updated on 05-Jul-2021 08:41:25

The power transformers are design to operate with an almost constant load which is equal to their rating. The maximum efficiency being designed to be at full load. Therefore, the fullload winding copper losses must be equal to the core losses.Actually, all the transformers are the same that is same ... Read More

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