Please Log in or Register for more.

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

169 views

1 Answer

Answer :

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

Like 0 like

Please log in or register to answer this question.

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.

Show More

160 views 1 answer







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.

Show More

166 views 1 answer







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

Show More

2.7k views 1 answer







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. 

Show More

158 views 2 answers








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

Show More

209 views 1 answer







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

Show More

289 views 1 answer







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

Show More

6.6k views 2 answers







Source transformation problem solution

Show More

144 views 0 answers













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

Show More

247 views 1 answer







Source transformation voltage source to current source and vice versa

Show More

98 views 0 answers







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

Show More

159 views 1 answer







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

Show More

75 views 0 answers







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. 

Show More

159 views 1 answer







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.

Show More

2 views 1 answer







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

Show More

78 views 1 answer







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. 

Show More

292 views 1 answer







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

Show More

28 views 1 answer







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.

Show More

20 views 1 answer







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.

Show More

26 views 1 answer







Voltage ratio
Last Answer : Voltage ratio

Show More

111 views 1 answer







Turns ratio
Last Answer : Turns ratio formula

Show More

80 views 1 answer







Impedance ratio
Last Answer : Impedance ratio

Show More

86 views 1 answer







Current ratio
Last Answer : Current ratio

Show More

71 views 1 answer







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

Show More

181 views 1 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
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

Show More

289 views 1 answer







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

Show More

1.0k views 1 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  (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

Show More

523 views 1 answer







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

Show More

98 views 1 answer







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)

Show More

154 views 1 answer







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)

Show More

98 views 1 answer







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

Show More

582 views 2 answers







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.

Show More

743 views 1 answer







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.

Show More

112 views 1 answer







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.

Show More

711 views 1 answer







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.

Show More

926 views 1 answer








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

Show More

90 views 1 answer







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.

Show More

269 views 1 answer








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.

Show More

324 views 1 answer








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

Show More

878 views 1 answer








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

Show More

103 views 1 answer








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

Show More

174 views 1 answer







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

Show More

152 views 1 answer







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 

Show More

515 views 0 answers







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

Show More

345 views 1 answer







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

Show More

8 views 1 answer







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.

Show More

8 views 1 answer







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.

Show More

7 views 1 answer







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.

Show More

3 views 1 answer







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!

Show More

2 views 1 answer






Show More⇦ PreviousNext ⇨