Impulse testing of transformers is done to determine the ability of:

 Impulse testing of transformers is done to determine the ability of: A) bushings to withstand vibrations B) insulation to withstand transient voltages C) windings to withstand voltage fluctuations D) all of the above
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 Impulse testing of transformers is done to determine the ability of: insulation to withstand transient voltages

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Short circuit test on transformers is conducted to determine?

Last Answer : Short circuit test on transformers is conducted to determine copper losses.

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Description : State and justify which of the following two transformers is better:  Transformer A = 4% voltage regulation  Transformer B = 6% voltage regulation

Last Answer : Transformer A with 4% voltage regulation is better.  Justification: Voltage regulation refers to the percentage change in secondary voltage when load is changed from no-load to full-load with primary voltage ... 4% voltage regulation, which is less as compared to 6% of transformer B, it is better.

Which of the following company is associated with manufacture of high capacity transformers in India?

Description : Which of the following company is associated with manufacture of high capacity transformers in India? A) M/S National Thermal Power Corporation Limited B) M/S Bharat Heavy Electricals Limited C) M/S Heavy Engineering Corporation Limited D) M/S Electricity Authority of India

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Instruments transformers are used on a.c. circuits for extending the range of

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The potential transformers Nominal Ratio is defined as the ratio of:

Description : The potential transformers Nominal Ratio is defined as the ratio of:

Last Answer : The potential transformers Nominal Ratio is defined as the ratio of: rated primary winding voltage and rated secondary winding voltage

Two transformers with identical voltage ratings are working in parallel to supply common load. The percentage

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Which of the following are constant losses in Transformers?

Description : Which of the following are constant losses in Transformers? (1) Winding losses (2) Core losses (3) Both Winding & core losses (4) None of these

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Two transformers are to be operated in parallel such that they share load in proportion to their kVA ratings.

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In transformers, which ofthe following statements is valid?

Description : In transformers, which ofthe following statements is valid?  A) In an open circuit test, copper losses are obtained while in short circuit test, core losses are obtained B) In an open circuit test, ... drawn at zero power factor D) In an open circuit test, current is drawn at low power factor

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Two transformers operating in parallel will share the load depending upon their

Description : Two transformers operating in parallel will share the load depending upon their

Last Answer : Two transformers operating in parallel will share the load depending upon their Per unit impedance

Natural oil cooling is used for transformers up to a rating of?

Last Answer : Natural oil cooling is used for transformers up to a rating of 3000 kVA.

If the percentage impedances of the two transformers working in parallel are different, then?

Description : If the percentage impedances of the two transformers working in parallel are different, then?

Last Answer : If the percentage impedances of the two transformers working in parallel are different, then parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load.

Distribution transformers are generally designed for maximum efficiency around?

Last Answer : Distribution transformers are generally designed for maximum efficiency around 50% load.

Star/star transformers work satisfactorily when?

Last Answer : Star/star transformers work satisfactorily when load is balanced .

Power transformers are generally designed to have maximum efficiency around?

Last Answer : Power transformers are generally designed to have maximum efficiency around near full-load.

Two transformers do not have equal percentage impedance. This is likely to result in?

Description : Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in?

Last Answer : Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in loading of the transformers not in proportion to their kVA ratings.

For the parallel operation of single phase transformers it is necessary that they should have?

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Natural air cooling is generally restricted for transformers up to?

Last Answer : Natural air cooling is generally restricted for transformers up to 1.5 MVA .

Losses which occur in rotating electric machines and do not occur in transformers are?

Description : Losses which occur in rotating electric machines and do not occur in transformers are?

Last Answer : Friction losses windage losses 

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

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.

The efficiencies of transformers compared with that of electric motors of the same power are?

Description : The efficiencies of transformers compared with that of electric motors of the same power are?

Last Answer : Transformers have high efficiency than the same ratted motors

Is Doble Testing valid on "Dry Type" transformers What is ANSI or IEEE 's opinion?

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Last Answer : Refer this url to know about IEEE/ANSI

Routine maintenance of dry-type transformers should include ______________. A. preventing the entrance of water from broken pipe lines steam lines B. keeping protective surfaces and insulating bushings free of dirt and conductive debris C. periodic testing of insulation resistance with a megger D. all of the above

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Last Answer : Answer: D

A no-load test is performed on a transformer to determine?

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Last Answer : A no-load test is performed on a transformer to determine magnetizing current and loss.

Sumpner's test is conducted on transformer to determine?

Description : Sumpner's test is conducted on transformer to determine?

Last Answer : Sumpner's test is conducted on transformer to determine temprature.

What are the schedules of maintenance done on transformers?

Description : What are the schedules of maintenance done on transformers?

Last Answer : Ans. Following are the schedules of maintenance on transformers. a. Daily maintenance. b. Monthly maintenance. c. Quarterly maintenance. d. Half yearly maintenance. e. Yearly maintenance. f. 5 Yearly maintenance.

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Last Answer : Maintain an impartial attitude on all matters which come under his review.

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Description : The Code of Professional Ethics states, in part, that a CPA should maintain integrity and objectivity. Objectivity refers to the CPA's ability to a. Insist on all matters regarding audit ... were consistently applied. d. Maintain an impartial attitude on all matters which come under his review

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Which of the following is true? Single layer associative neural networks do not have the ability to: (i) perform pattern recognition (ii) find the parity of a picture (iii)determine whether two or more shapes in a picture are connected or not a) (ii) and (iii) are true b) (ii) is true c) All of the mentioned d) None of the mentioned

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JCB would look to which of the following factors to determine how trade barriers would affect its ability to market its earth-moving equipment in various countries? A) Political and legal forces B) Interpersonal forces C) Social forces D) Technological forces E) Industrial forces

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Last Answer : A) Political and legal forces

How can you determine if a voltaic cell is reversible (rechargeable) before testing it?

Description : How can you determine if a voltaic cell is reversible (rechargeable) before testing it?

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When using a megohmmeter to determine which shunt field coil is grounded in a DC machine, you must ____________. A. insulate the field frame from the ship's hull B. disconnect each shunt field coil before testing C. use a motor driven high capacity megohmmeter D. remove all main line lead connections before testing

Description : When using a megohmmeter to determine which shunt field coil is grounded in a DC machine, you must ____________. A. insulate the field frame from the ship's hull B. disconnect each shunt ... C. use a motor driven high capacity megohmmeter D. remove all main line lead connections before testing

Last Answer : Answer: B

Besides testing the quality of the food itself, inspections should be made to determine the cleanliness ofa. Premises where food is handled and prepared b. Washing facilities c. Food storage facilities d. All of the above

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Which of the following statements refer to correct purpose as regards testing of concrete by ultrasonic pulse velocity method? 1. To assess the quality of concrete in-situ. 2. To determine the dynamic modulus of elasticity of concrete. 3. To locate the presence of cracks in it (a) 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d)1, 2 and 3

Description : Which of the following statements refer to correct purpose as regards testing of concrete by ultrasonic pulse velocity method? 1. To assess the quality of concrete in-situ. 2. To determine the dynamic modulus of elasticity of concrete. 3 ... and 2 only (b) 1 and 3 only (c) 2 and 3 only (d)1, 2 and 3

Last Answer : (d)1, 2 and 3

Explain the laboratory procedure to determine the compressive strength of concrete cubes as per IS-516-1959 with reference to following points: i. Preparation of test specimen ii. Procedure of testing iii. Interpretation of results

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Last Answer : Preparation of test specimen: i. Take three cubes of 15 cm sides and apply oil to its inner surface. ii. Prepare the concrete mixture of required grade and fill it in each mould in 3 layers. ... say 23N/mm 2) than the specified grade M20, then that concrete is safe and good for construction.

If you did some goofy, impulse, online shopping during the first year of the pandemic, what is your favorite item?

Description : If you did some goofy, impulse, online shopping during the first year of the pandemic, what is your favorite item?

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Are inclinations an impulse?

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What impulse would make someone make jokes about the earthquake-tsunami disaster in Japan?

Description : What impulse would make someone make jokes about the earthquake-tsunami disaster in Japan?

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Where does the impulse to "sweep it under the rug" come from? Is this a helpful impulse?

Description : Where does the impulse to "sweep it under the rug" come from? Is this a helpful impulse?

Last Answer : Shame almost never works I have that sweep it under the rug' impulse too, it's been instilled in me from 40 years of conditioning from my family. When I was seeing a counselor to work through issues ( ... only my happiness, but that of those around me so I CHOOSE to face my problems head on now.