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What is mitigation of harmonics?
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What is current harmonics?

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What are even and odd harmonics?

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What are the main causes of harmonics?

Answer :

Harmonic is a non linear load because linear load voltage deviated due to connection of some electrinie device such as converter,inverter

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Why do non linear loads cause harmonics?

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Why harmonics are generated in electrical system?

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Explain the “mitigation of power theft” and “faulty meter replacement” for energy conservation techniques to reduce commercial losses. 

Answer :

Energy conservation techniques to reduce commercial losses:  1. Mitigation of Power Theft: Power theft being the most important issue which all of the service providing utilities ... agricultural sector. Prepaid meters may prove effective measures against unauthorized abstraction of energy. 

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Explain the effect of Harmonics on the Transformer.

Answer :

Effect of Harmonics on the Transformer:  1. Core loss: Harmonic voltage increases the hysteresis and eddy current losses in the lamination. The amount of the core loss depends on ... small core vibrations.  5. Saturation problem: Sometimes additional harmonic voltage causes core saturation.

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Slot harmonics are reduced in induction motors by using (A) fractional-pitch windings (B) fractional-slot windings (C) integral-slot windings (D) distributed windings

Answer :

Slot harmonics are reduced in induction motors by using fractional-slot windings

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Answer :

The main reason for generation of harmonics in a transformer could be saturation of core.

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Answer :

Harmonics in transformer result in increased core losses, increased I2R losses, and magnetic interference with communication circuits.

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State the need for reduction of harmonics in inverters. Enlist the various methods for reduction of harmonics in inverter output.

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Which one of the following is appropriate for natural hazard mitigation? (A) International AID (B) Timely Warning System (C) Rehabilitation (D) Community Participation

Answer :

(D) Community Participation

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Software safety is a ................... activity that focuses on the identification and assessment of potential hazards that may affect software negatively and cause an entire system to fail. (A) Risk mitigation, monitoring and management (B) Software quality assurance (C) Software cost estimation (D) Defect removal efficiency

Answer :

(B) Software quality assurance

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Quality of a musical note depends on (1) Fundamental frequency (2) Amplitude of the wave (3) Harmonics present (4) Velocity of sound in the medium

Answer :

 Harmonics present

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In star-star connection of 3-phase transformer, the triplen harmonics are suppressed by using (A) star connected tertiary windings (B) delta connected tertiary windings (C) neutral conductor (D) additional insulation for the phases 

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In order to reduce the harmful effects of harmonics on the AC side of a high voltage DC transmission system_____ are provided. (A) synchronous condensers (B) shunt capacitors (C) shunt filters (D) static compensators

Answer :

In order to reduce the harmful effects of harmonics on the AC side of a high voltage DC transmission system shunt filters are provided. 

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What is the use of power factor correction?

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What is the best power factor?

Answer :

It is unity power factor but difficult to achieve in dynamic loads

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What is power factor angle?

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What is difference between KW and KVA?

Answer :

kW is kilowatt and kVA is kilovolt ampere. kW is unit of real power and kVA is unit of Apparent power.

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What is a digital power meter?

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What is an RF Power Meter?

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What causes random power outages?

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What is the difference between linear and nonlinear electrical loads?

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What is a non linear load?

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What is the advantage of high power factor?

Answer :

Reduced copper losses Smaller conductor size Improve voltage regulation Increase system capability Less energy bill

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What is meant by KVA?

Answer :

KVA - kilo volt ampere  Used to specify the transformer details

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What is the cause of voltage fluctuation?

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What is power logger?

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What does an electric meter measure?

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What are the power quality disturbance?

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What is harmonic in power quality?

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What is a power quality analyzer?

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What is power quality meter?

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What are the different power quality issues?

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What is good power quality?

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What is power quality monitoring?

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What can you do to prevent a power surge?

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What is the difference between a blackout and brownout?

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What is the cause of a brownout?

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What can cause a short circuit?

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What causes transients?

Answer :

Transient is a peak voltage take small period. It will occur due to lightning

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What causes lights to dim in house?

Answer :

While taking a more load from other Equipment

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What is the definition of brownout?

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What can cause a voltage spike?

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What would cause a power surge in a house?

Answer :

If your neibour / other flat owners / your maintainer staff switch on any type of inductive load that can cause power surge / dip  

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What is meant by power dip?

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What is voltage interruption?

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What is meant by a voltage surge?

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What is voltage sags and swells?

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