Transformer efficiency

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Transformer efficiency

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Description : A transformer operates 24 hours day at full -load. It's full -load efficiency is :  (A) equal all day efficiency (B) more than all -day efficiency (C) less than all -day efficiency (D) equal to maximum efficiency

Last Answer : A transformer operates 24 hours day at full -load. It's full -load efficiency is : equal all day efficiency 

Last Answer : The efficiency of transformer is Greater than electrical Machine because there is no rotational losses in transformer and there is no air gap losses in transformer so losses is less in transformer compare to electrical machine so efficiency is higher in case of transformer.

Last Answer : Transformer efficiency is maximum when copper losses are equal to iron losses.

Description : State why a transformer always have an efficiency of more than 90%.

Last Answer : As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.

Last Answer : The efficiency of a power transformer is of the order of 98 percent.

Last Answer : An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.

Description : For a transformer, operating at constant load current, maximum efficiency will occur at?

Last Answer : For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.

Description : The efficiency of a transformer, under heavy loads, is comparatively low because?

Last Answer : The efficiency of a transformer, under heavy loads, is comparatively low because copper loss becomes high in proportion to the output.

Description : method for improving string efficiency 

Last Answer : The Methods of Improving String Efficiency:-   1) By reducing value of ‘m’ or (‘k’) by using longer cross arm. 2) By Making of ‘m’ or (‘k’) equal to zero 3) By grading Insulator. 4) By Using guard ring.

Description : "Efficiency of thermal power station is low". — Justify. 

Last Answer : Justification: Efficiency of thermal power station is low":- Overall efficiency of T.P.P depends upon efficiency of boiler, turbine and alternator. The heat produced due to combustion of coal ... losses in thermal power plant is 71%, So efficiency of thermal power plant is less about 29% 

Description : SEER: Seasonal Energy Efficiency Ratio (SEER)

Last Answer : SEER: Seasonal Energy Efficiency Ratio (SEER), is most commonly used to measure the efficiency of a central air conditioner. The higher the SEER, the more efficient the system OR It is the ... the ratio of total capacity to the total KW energy usage at specific humidity and temperature condition.

Description :  Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span 

Last Answer : Parameter LED CFL Lamp Efficiency  High (more than 70 lumen per watt) Comparatively less (50-60 lumen per watt) Life span (in working hours) 10000 3000

Description : Define PIV, TUF, ripple factor, efficiency of rectifier.

Last Answer : PIV: Peak Inverse Voltage (PIV) is defined as the maximum negative voltage which appears across non-conducting reverse biased diode. TUF : Transformer Utilization Factor (TUF) is defined as the ratio of DC output ... Efficiency of rectifier: η = DC output power/ AC input power = PLdc / Pac

Description : What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

Last Answer : What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

Description : The overall efficiency of Thermal Power Plant is equal to _______________ .  (A) Regenerative Cycle Efficiency (B) Renkine Cycle Efficiency (C) Carnot cycle efficiency (D) None of the above

Last Answer : The overall efficiency of Thermal Power Plant is equal to Regenerative Cycle Efficiency. 

Description : The rankine cycle efficiency of steam power plant is  (1) 60-80% (3) 30-45% (2) 45-80% (4) 20-30%

Last Answer : The rankine cycle efficiency of steam power plant is 30-45%

Description : Transmission efficiency of a transmission line increases with the

Last Answer : Transmission efficiency of a transmission line increases with the increase in power factor and voltage

Description : For high efficiency of transfer of power, internal resistance of the source should be?

Last Answer : For high efficiency of transfer of power, internal resistance of the source should be less than the load resistance.

Last Answer : The efficiency of diesel locomotives is nearly 20 to 25 percent.

Last Answer : The overall efficiency of steam locomotive is around 5 to 10 percent.

Last Answer : D.C. generators are normally designed for maximum efficiency around full-load.

Last Answer : The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.

Last Answer : The range of efficiency for shaded pole motors is 5% to 35%.

Last Answer : The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.

Last Answer : Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.

Description : The efficiency of two identical transformers under load conditions can be determined by?

Last Answer : The efficiency of two identical transformers under load conditions can be determined by back-to-back test.

Description : Which motor have more efficiency, synchronous motor or induction motor?

Last Answer : Synchronous motor has more efficiency.

Last Answer : String efficiency is used for measuring the degree of utilization of SCR.

Description : At what power maximum efficiency of power transformer and distribution transformer is designed

Last Answer : Maximum efficiency of the transformer is attained at certain load factor (α) when core losses of transformer is equal to the copper losses. PCore loss = α ^2 X PCopper loss From the ... the day. Hence distribution transformers are designed to have maximum efficiency at 50% of the rated full load

Description : What are the necessary tests to determine the efficiency, voltage regulation, and temperature rise of winding & insulation of transformer?

Last Answer : 1.Direct loading test 2.Open circuit test 3. Short circuit test 4. Sumpner's or back to back test

Description : Define all day efficiency of a transformer?

Last Answer : A:It is computed on the basis of energy consumed during a certain period, usually a day of 24 hrs. All day efficiency=output in kWh/input in kWh for 24 hrs.

Description : What is the condition for maximum efficiency of transformer?

Last Answer : When Iron losses is equal to copper losses.

Description : Define efficiency of the transformer?

Last Answer : Transformer efficiency ƞ= (output power/input power) x 100

Description : Why the efficiency of distribution transformer is 60 to 70 % and not 100%?

Last Answer : Distribution transformer is designed for maximum efficiency at 60% to 70% load as it normally doesn't operate at full load all the time. Its load depends on distribution demand. Whereas power transformer ... efficiency at 100% load as it always runs at 100% load being near to generating station.

Description : 48.During light loads, the transformer efficiency is low because A. Secondary output is low B. Transformer losses are high C. Fixed loss is high in proportion to the output D. Cu loss is small

Last Answer : C. Fixed loss is high in proportion to the output

Description : 42 The efficiency of a transformer will be maximum when A. copper losses = hysteresis losses B. Hysteresis losses = eddy current losses C. Eddy current losses = copper losses D. Copper losses = iron losses

Last Answer : D. Copper losses = iron losses

Description : 40 No load test on a transformer is carried out to find A. Copper loss B. magnetising current C. Magnetising current and loss D. Efficiency of the transformer

Last Answer : C. Magnetising current and loss

Description : 22 No load test on a transformer is carried out to find A. copper loss B. magnetising current C. Magnetising current and no load loss D. Efficiency of the transformer

Last Answer : C. Magnetising current and no load loss

Last Answer : In a transformer, routine efficiency depends upon load current and power factor of load.

Last Answer : The maximum efficiency of a distribution transformer is at 50% full load.

Description : What's the argument against putting a toilet (stool) in a shower stall?

Last Answer : Since the toilet paper would be getting wet, you are saying you would just clean yourself with soap and water?

Description : Hospital Quality?

Last Answer : You need to look at their outcomes and their budgets. Otherwise you have now basis on which to make the judgment.

Description : How can I easily release one drop of liquid dish soap at a time?

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Description : Does a car run more efficiently if it is used more often?

Last Answer : answer:No, but you are more efficient at using the car, because now you are familiar with its quirks and behaviors and it is second nature to you as you drive your daily commute. There may have ... s mileage was? And are you calculating this yourself or are you relying on a display from the car?

Description : What evolutionary advantage did the compulsion toward religion confer on humans?

Last Answer : Have there really been 110 billion humans? I think I’ll need a source for that. Every biologist I’ve ever heard mention it says that more people are alive today than have ever been alive in the past. So, we’re talking 16 billions, max.

Description : I am requesting recommendations on a really light efficient carry on?

Last Answer : I have a nylon sports bad that folds down to the size of a wallet, and expands to hold all the things you have mentioned. It is very lightweight, yet strong.

Description : Do you experience any social pressure to do things that are more productive?

Last Answer : answer:Nah, I don't pressure anyone to be productive. A lot of people I know and hang out with are very successful, so who am I to tell them what to do in the free time that they have?! Myself ... I do feel like I'm watching too much tv, I'll stop and go walk or something more productive though.

Description : Would it be more efficient in winter to have refrigerators and freezers be able to draw air from the outside?

Last Answer : answer:Food in my outside refrigerator freezes in the winter. It’s not such a great idea. As far as cooling, it’s cold as hell, though.

Description : Cost of refuse; Which municipal system can best handle a small amount of mixed small-sized refuse ?

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Description : What labor saving device do you wish someone would invent now?

Last Answer : Self-clipping cat nails and self-cleaning litter box.