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What is harmonic in power quality?
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What are the power quality disturbance?

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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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Answer :

Power quality is important because the electrical appliances will works better and will be safer and less loss in energy. Low energy waste and improves stability of power system .

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Answer :

By applying various power quality monitoring devices and using telecommunication technique .

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The time period of third harmonic of power supply frequency, in milliseconds, is (A) 20 (B) 3.33 (C) 6.66 (D) 60

Answer :

The time period of third harmonic of power supply frequency, in milliseconds, is 6.66 

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Description :

Explain energy conservation technique “by improving power quality” for induction motor.

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Energy conservation method in induction motor by improving power quality: Electrical energy can be conserved by improving the power quality. It can be achieved by avoiding voltage unbalance, maintaining ... losses can be minimized by using harmonic filter thus reducing the harmonics in the system.

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What is the harmonic filter?

Answer :

It is being used to supress the input voltage distortion at input side of any electrical equipment. This distortion is created by other electrical loads like motor, drives etc nearby connected with ... for a range of harmonics or specific harmonics like 3rd harmonics  5th harmonics, 7th harmonics. 

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Description :

To get minimum harmonic distortion in the output, a 3-Ф to 3-Ф cyclo-converter requires :  (A) 12 SCRs (B) 18 SCRs (C) 36 SCRs (D) 72 SCRs

Answer :

To get minimum harmonic distortion in the output, a 3-Ф to 3-Ф cyclo-converter requires : 36 SCRs

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The second harmonic distortion is defined as the A) Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency B) Harmonic distortion due to only second harmonic component C) Sum of distortion of first and second harmonic components in the output 

Answer :

The second harmonic distortion is defined as the Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency

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Description :

The fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is (A) 2/3 (B) 5/6 (C) 7/8 (D) 6/7

Answer :

The fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is 6/7

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Description :

Explain the sinusoidal harmonic reduction techniques for cylcoconverters.

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Quality control is aimed at: a. Maintaining the desired quality b. Exceeding the desired quality c. Continuously improving the quality d. Following the quality

Answer :

Quality control is aimed at: a. Maintaining the desired quality b. Exceeding the desired quality c. Continuously improving the quality d. Following the quality

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Description :

Explain various performance parameter used to evaluate the quality of inverters.

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What would cause a power surge in a house?

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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 the use of power factor correction?

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What is the best power factor?

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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 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 advantage of high power factor?

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

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What is power logger?

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What can you do to prevent a power surge?

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What is meant by power dip?

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Can you have a power factor greater than 1?

Answer :

We cannot have power factor greater than 1. As it is a measure of cosine of angle between voltage and current. 

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Why do we need to correct power factor?

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How do you measure power factor?

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P= 1.83*V*I*[email protected] where P is power           V is voltage            I is current           COS @ is P.F [email protected]= P/(1.83*V*I)  in other way cos @ = true power/apparent power

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Can a power surge erase a hard drive?

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Can power surge damage your computer?

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How often do power surges occur?

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What is the choice of size and number of generator units in interconnected power system?

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Choice of Size and Number of Generating Units: 1. The size/rating and number of generating units in such way that they approximately match with the load curve as closely as possible. 2. In ... , if power plant is connected to grid system then generating unit of higher capacity can be installed.

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What is the purpose of the turbines in coal fired power plants?

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What is the largest power plant in the world?

Answer :

japam

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What is sag in power system?

Answer :

Sag is a catenary curve in between two points of supporters.and also we can say the lowest point of the conductor in between the two points of supporters. 

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What is meant by feeder in power system?

Answer :

A feeder line is a peripheral route or branch in a network which connects smaller or more remote nodes with a route or branch carrying heavier traffic. The term is applicable to any system based on a hierarchical network.

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What is microgrid in power system?

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What are the types of power losses in inductor?

Answer :

Copper losses, Eddy current loss, and hysteresis loss are the types of power losses in inductor.

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What is the value of Beta in power BJT?

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The beta value in power BJT is 5 to 10.

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What is drive circuit in power electronics?

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Driver is used for Motion Control through the use of power electronics.

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What is the value of capacitance required to improve power factor from 0.7 to 0.9. Given that: Real power = 50 W Vrms of the source = 120 Frequency = 50 Hz   #powerfactor

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What are the basic requirements of locating wind power plant ?

Answer :

The basic requirements of locating wind power plant:  1) The site should be selected where winds are strong i.e. where pressure of wind is high and there is continuity. 2) Wind pressure ... the turbine which can affect the system's overall performance. 10)Possibility to connect to power grid. 

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What are the criteria for selection of site for hydroelectric power plant?

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Following Factors to be kept while site selecting for Hydro power plant:  1. It should be located where high rain fall occurs. 2. A large catchments area must be available to store water. 3. It ... 12. Cost of land should be less. 13. Skilled and unskilled man power should be available nearby.

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Options: A) WATT B) AMPERE C) VOLTS D) OHM

Answer :

Correct Answer: A) WATT

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What is need of regulated power supply?

Answer :

A regulated power supply is used to ensure that the output remains constant even if the input changes. But sometimes main supply voltage, load, and surrounding temperature keep changing and altering the ... power supply is needed that will accept an AC input and give a constant DC output.

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Description :

What is the Power Supply specification for 8085AH microprocessor? A) Single +5V supply with 10% voltage margins B) Dual +5V supply with 10% voltage margins C) Single +10V supply with 5% voltage margins D) Dual +5V supply with 5% voltage margins 

Answer :

What is the Power Supply specification for 8085AH microprocessor? A) Single +5V supply with 10% voltage margins B) Dual +5V supply with 10% voltage margins C) Single +10V supply with 5% voltage margins D) Dual +5V supply with 5% voltage margins 

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