172 views

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?

1 Answer

Answer :

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is approximately equal to 1.

Like 0 like

Please log in or register to answer this question.

Related questions

179 views

Description : Use of auto-transformer is economical when the transformation ratio is?

Last Answer : Use of auto-transformer is economical when the transformation ratio is near unity.

1 answer
182 views

Description : The voltage transformation ratio of a transformer is equal to the ratio of?

Last Answer : The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.

1 answer
2.7k views

Description : Define: 1) voltage ratio, 2) current ratio, 3) transformation ratio of transformer.

Last Answer : 1) Voltage ratio: The voltages in primary and secondary winding is proportional to number of turns in primary and secondary respectively. So, the voltage ratio is same as transformation ratio. V2/V1 = N2 ... as transformation ratio of transformer. It is denoted by K. K = N2/N1

1 answer
159 views

Description : What is transformation ratio?

Last Answer : Transformation Ratio (k):- It is the ratio of secondary number of turns to primary number of turns. OR It is the ratio of secondary voltage to primary voltage. OR It is the ratio of primary current to secondary current. 

2 answers
619 views

Description : Reduction in core losses and increase in permeability are obtained with transformer employing?

Last Answer : Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.

1 answer
157 views

Description : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

Last Answer : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

1 answer
298 views

Description : 3kW load is supplied by an autotransformer with 0.7 transformation ratio. Conductively transferred power from primary to secondary is (A) 2.1 kW (B) 0.9 kW (C) 4.29 kW (D) 3 kW

Last Answer : 3kW load is supplied by an autotransformer with 0.7 transformation ratio. Conductively transferred power from primary to secondary is 2.1 kW

1 answer
6.7k views

Description : An Auto-transformer (which has only one winding) may be used as a ______ .  (A) Both Step-Up and Step-Down transformer (B) Step-Down Transformer (C) Step-Up Transformer (D) None of these

Last Answer : an autotransformer may used only as step down transformer

2 answers
216 views

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

Last Answer : Friction losses windage losses 

2 answers
87 views

Description : Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.

0 answers
1 view

Description : What is that one big thing you're saving your pennies for?

Last Answer : A home of my very own.

1 answer
12 views

Description : How to Choose an Energy Saving Light Bulb?

Last Answer : Popular in Russia Ilyich's bulbs are becoming a thing of the past, giving way to more modern lamps, which, as the name suggests, are designed to help conserve energy. What are their advantages ... light bulb for certain conditions, which will last a long time and will be efficient enough to use.

1 answer
5 views

Description : Is it worth saving on sleep?

Last Answer : Is it worth saving on sleep? There is no consensus on this matter. Many well-known Luli and scientists have their own views on issues related to sleep. Many are of the opinion of Napoleon that healthy ... . So is it worth depriving yourself of normal sleep and health for the sake of the daily rush?

1 answer
105 views

Description : Blackt Electrotech 230V 24x7 Energy Saving Socket Type Digital Programmable Plastic Electronic Timer (White)

Last Answer : Buy from amazon: https://amzn.to/2SUTSdv Buy: http://bit.ly/2ZqlAkS

1 answer
8 views

Description : 14 Weird But Effective Ways to Avoid A Bad Hair Day

Last Answer : Nothing can ruin an otherwise fine morning like uncooperative hair. The more you brush, comb or style it with your fingers, the more it frizzles or stands up like you've just been electrocuted. Waste no time ... some new things for your hair. Open that jar of mayo and say goodbye to bad hair days.

1 answer
10 views

Description : How to Be an Effective Leader

Last Answer : How to Be an Effective Leader Leadership is more complex than follow the leader. Effective leadership is all about taking a group to the direction of success, and to realize the goals you all agree ... these tips, you can be an effective leader in whatever task your group is expected to perform.

1 answer
176 views

Description : The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of?

Last Answer : The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of iron loss in core.

1 answer
206 views

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Last Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

1 answer
797 views

Description : A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is

Last Answer : A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is 0.707

1 answer
314 views

Description : At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is :  (A) 7000 W (B) 6000 W (C) 8000 W (D) 4000 W

Last Answer : At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is : 6000 W

1 answer
145 views

Description : Source transformation problem solution

0 answers
144 views

Description : Find the current through 4 ohm resistor by source transformation

0 answers
261 views

Description : Source transformation Replace the circuit with voltage source in series with a single resistor

Last Answer : Source transformation Replace the circuit with voltage source in series with a single resistor

1 answer
100 views

Description : Source transformation voltage source to current source and vice versa

0 answers
168 views

Description : Wye Delta Transformation

Last Answer : Wye Delta Transformation 1 : https://youtu.be/mPKeczDWZCo Wye Delta Transformation 2 : https://youtu.be/k80VbHI-wwg Wye Delta Transformation 3 : https://youtu.be/6cnwj15uw5M Wye Delta Transformation ... 8 : https://youtu.be/knRb5UW1404 Wye Delta Transformation 9 : https://youtu.be/JBwHKBJ08WM

1 answer
78 views

Description : Explain space vector transformation and space vector switching with the help of diagram. What are the advantages of SVM?

0 answers
128 views

Description : State the losses in secondary distribution system. 

Last Answer : The losses in secondary distribution system: a) Technical losses: 1. Due to poor voltage 2. Due to unbalance load 3. Due poor quality of transformer & its components 4. Due to poor quality ... of induction type of energy meter. 3. Lack of administration. 4. Energy theft 5. Unmetered supply

1 answer
128 views

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

Last 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. 

1 answer
211 views

Description : Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Last Answer : (i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.

1 answer
3.3k views

Description : The friction losses in Real Transformers are :  (A) 0% (B) 5% (C) 25% (D) 50%

Last Answer : A

2 answers
92 views

Description : Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

Last Answer : Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

1 answer
141 views

Description : In DC motor iron losses are occurred in?

Last Answer : In DC motor iron losses are occurred in the armature.

1 answer
164 views

Last Answer : Iron losses in a D.C. machine are independent of variations in load.

1 answer
527 views

Last Answer : In case of D.C. machines, mechanical losses are primary function of speed.

1 answer
274 views

Last Answer : In a D.C. generator, the iron losses mainly take place in armature rotor.

1 answer
146 views

Last Answer : The total losses in a well designed D.C. generator of 10 kW will be nearly 500 W.

1 answer
107 views

Description : In a synchronous motor which losses varies with load?

Last Answer : In a synchronous motor, copper losses varies with load.

1 answer
63 views

Description : What are the losses in a transmission line?

0 answers
124 views

Description : What are the types of power losses in inductor?

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

1 answer
122 views

Description : What is the percentage of stray losses in DC machine?

Last Answer : Percentage of stray losses in DC machine is about 1 % .

1 answer
519 views

Description : In synchronous motor, does the winding losses vary with load?

Last Answer : No, in the synchronous motor the winding losses do not vary with load.

1 answer
121 views

Last Answer : Iron loss, copper loss and mechanical losses these are the losses in DC machine.

1 answer
296 views

Description : Explain the on state losses in power BJT.

Last Answer : On state losses in power BJT: Transistor have four types of losses one is turn on state losses second is turn off state losses third is turn on switching losses and fourth is turn ... ON = VCE sat x IC With increasing collector current collector to emitter saturation voltage increases.

1 answer
10 views

Description : How to Solder Copper Pipe

Last Answer : How to Solder Copper Pipe Copper tubing or pipes work well for air, water or even refrigerants. If you want to join them together with sweat joints , you'll have to learn how to solder them ... effect on their efficiency. Follow these steps and be able to do copper pipe soldering all by yourself.

1 answer
5 views

Description : How to Patina Copper

Last Answer : How to Patina Copper Patina is that tarnish coating that develops outside metal, like copper, over time. Not only does it add an attractive appearance to copper, but it also provides protection to harsh ... egg. Once you've reached the desired patina coat, rinse the copper pieces in lukewarm water.

1 answer
6 views

Description : How to Clean Copper

Last Answer : How to Clean Copper Whether it's a coin, a pan, or a trophy, copper has one of the nicest-looking finishes among common metals. Copper can retain its finish for quite a while, although it is ... properly. With these tips, you'll never have to worry about your copper items losing their shine again.

1 answer
143 views

Description : Why is aluminium used instead of copper for overhead cables?

Last Answer : Because copper reacts with atmosphere variation and it's cost High as compared to aluminium and aluminium is good property and less cost so aluminium is used

6 answers
2.8k views

Description : Which is a semiconductor: copper, silicon, or neon?

Last Answer : Copper is a metal. Silicon is a semiconductor. Neon is inert gas.

1 answer
79 views

Description : Compare copper and aluminium.

Last Answer : Copper Aluminium Resistivity is less Resistivity is more More weight Low weight Mechanically strong Mechanically weaker Specific Gravity high Specific Gravity Low ... Tensile strength is half of that of copper Used for winding Used for overhead lines

1 answer
335 views

Description : Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be?

Last Answer : Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be 10 ohms.

1 answer
...