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

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

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

## Related Questions

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

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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.

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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

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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.

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Last Answer : For a consumer the most economical power factor is generally 0.95 lagging .

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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

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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

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Source transformation problem solution

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Find the current through 4 ohm resistor by source transformation

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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

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Source transformation voltage source to current source and vice versa

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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

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

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What is the use of transformer?
Last Answer : The use of transformer  is to do lower or raise  the voltage or currents in an electrical  circuit.  That's quite so simple.

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Has any jelly here gone through est training?
Last Answer : answer:I have an older female relative who was very into this for a while. I was too young to really remember, but this relative took my mom to a retreat and mom said it was very reminiscent of an Amway ... to help control their lives. I do not think, as a whole, it has stood the test of time.

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Find power delivered by voltage source
Last Answer : Find power delivered by voltage source

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In otto cycle compression ratio is 8. Calculate air standard efficiency. Will it be grater than Carnot Cycle ? Justify your answer.
Last Answer : No, the Otto cycle efficiency 56.47% will always be lower than Carnot cycle efficiency. Justification: Carnot theorem states that keeping operating conditions same, Carnot engine is more efficient than any other engine. So, Otto cycle efficiency is lower than Carnot cycle efficiency.

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Graph indicating changes in pollutants level w.r.t air fuel ratio
Last Answer : Graph indicating changes in pollutants level w.r.t air fuel ratio

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Compressor pressure ratio (CPR)
Last Answer : Compressor pressure ratio (CPR), is the ratio of the air total pressure exiting the compressor to the air pressure entering the compressor. This number is always greater than 1.0.

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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.

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Voltage ratio
Last Answer : Voltage ratio

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Turns ratio
Last Answer : Turns ratio formula

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Impedance ratio
Last Answer : Impedance ratio

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Current ratio
Last Answer : Current ratio

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The ratio of the width to the height of the picture frame is called as A) Rastar B) Aspect Ratio C) Length Ratio D) Efficiency
Last Answer : The ratio of the width to the height of the picture frame is called as Aspect Ratio

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If the fault current is 6000 A, the relay plug setting is 150% and the CT ratio is 400/5, the plug setting multiplier will be
Last Answer : If the fault current is 6000 A, the relay plug setting is 150% and the CT ratio is 400/5, the plug setting multiplier will be 10

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Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is
Last Answer : Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is 16

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A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would  (1) increase progressively  (2 ... 0.5 and then increase  (4) increase to a maximum value at α = 0.5 and then decrease
Last Answer : A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would increase to a maximum value at α = 0.5 and then decrease

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If Poisson's ratio of a resistance wire strain gauge is 1.8, then neglecting piezo-resistive effects, its Gauge factor is :  (A) 2.8 (B) 2.6 (C) 4.6 (D) 3.6
Last Answer : If Poisson's ratio of a resistance wire strain gauge is 1.8, then neglecting piezo-resistive effects, its Gauge factor is : 4.6

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The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to :
Last Answer : The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to : Z (p.u)

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Specific energy consumption of an electric train is the ratio between (A) Specific energy output at driving wheels and efficiency of the traction motor (B) Specific energy output at driving wheels ... (D) Specific energy output at driving wheels and efficiency of the (motor + transmission gear)
Last Answer : Specific energy consumption of an electric train is the ratio between Specific energy output at driving wheels and efficiency of the (motor + transmission gear)

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Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor (A) is equal to that of a normal induction motor (B) is less than that of a normal induction motor (C) ... than that of a normal induction motor (D) may be less or greater than that of a normal induction motor
Last Answer : C

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The Eb/V ratio of a d.c. motor is an indication of its?
Last Answer : The Eb/V ratio of a d.c. motor is an indication of its efficiency.

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The ratio of mass of proton to that of electron is nearly?
Last Answer : The ratio of mass of proton to that of electron is nearly 1840.

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Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as?
Last Answer : Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as 2 : 5.

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The ratio of active power to apparent power is known as____ factor.
Last Answer : The ratio of active power to apparent power is known as power factor.

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Last Answer : The form factor is the ratio of r.m.s. value to average value.

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The ratio of limiting friction and normal reaction is known as?
Last Answer : The ratio of limiting friction and normal reaction is known as coefficient of friction.

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Last Answer : The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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Last Answer : The ratio of starting torque to full-load torque is least in case of shunt motors.

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Last Answer : A synchronous machine with low value of short-circuit ratio has lower stability limit.

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Last Answer : The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.

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What is the use of Buchholz relay in transformer?
Last Answer : This is a transformer that is used to step up and down current.

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An auto transformer having a transformation ratio of 0.8 supplies a load of 10 kW. The power transferred inductively from the primary to secondary is (a) 2 kW (b) 4 kW (c) 8 kW (d) 10 kW

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Explain construction and working of single phase Auto transformer.
Last Answer : Construction of single phase auto transformer: (i) It has only one winding wound on a laminated circular magnetic core. (ii) The core is made of silicon steel stampings. (iii) The two terminals of the ... help of handle. 5) The same transformer can be used as step-up or step down auto-transformer

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How Household Use Electricity And Energy
Last Answer : I have often wondered what the average use of energy of appliances is. Here is a breakdown by percentage usage of each consuming appliance taken from a sampling of US households. Refrigerators 13.7% ... Telephone 0.2 Rechargeable Tools 0.2 Humidifier 0.1 Automobile Block Heater 0.0 Residual 7.3

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How To Make Use Of Empty Film Canisters
Last Answer : Canteen SWAP Glue two grey lids together. Blue a small strip of leather around the outside, leaving some hanging for the carrying strap'. Glue pony bead on top for screw top. Flower Vase SWAP Use ... on two small wiggle eyes. Glue the lid on at an angle so the pompom head shows peeking out.

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How To Make Use Of Household Salt
Last Answer : 1. Soak stained hankies in salt water before washing. 2. Sprinkle salt on your shelves to keep ants away. 3. Soak fish in salt water before descaling; the scales will come off easier. 4. Put a ... 't smell and will bake into a dry, light crust which will wipe off easily when the oven has cooled.

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10 Ways To Use AlkaSeltzer
Last Answer : Clean a toilet Drop in two Alka-Seltzer tablets, wait twenty minutes, brush, and flush. The citric acid and effervescent action clean vitreous china. Clean a vase To remove a stain from the bottom of a ... mosquitos flock to it, drop dead and fall into the water or on the floor within about 10 ft.

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10 Unusual Ways to Use a Dishwasher
Last Answer : You may already know that dishwashers use less energy than hand-washing dishes, but did you know that they can be used for an assortment of other tasks, as well? Even if your dishwasher no longer functions for ... home? What do you do with it to make it earn its keep? Tell us in the comments below!