Compare autotransformer with two winding transformer.

Compare autotransformer with two winding transformer.
by

1 Answer

Answer :

Two winding transformer
Auto transformer
1.It has two separate windings : a) primary, b)secondary. 
1. An auto transformer has single winding which acts both as primary and secondary.
2. image
2. image
3. It provides good electrical isolation to both supply as well as load.
3. Electrical isolation is not provided by auto transformer as it has single winding only
4.Losses are higher than auto transformer due to its construction.
4. As only one winding is present, copper losses are less. Due to compact and simple structure of core, iron losses are also less.
5.Overall efficiency is lesser than auto transformer.
5. Overall efficiency is higher than two winding transformer. 
6. Cost is higher than auto transformer.
6. Cost is lesser than 2 winding transformer.
7.Application : used in 1. power distribution, 2. audio transmission, 3. Current transformer ,Potential transformer. 4. Electric furnaces
7. Application: 1. used in both Synchronous motors and induction motors 2. used in electrical apparatus testing labs since the voltage can be smoothly and continuously varied. 3. They find application as boosters in AC feeders to increase the voltage levels.
by

Related questions

Compare analog and digital ICs.

Description : Compare analog and digital ICs.

Last Answer : Sr. No. Analog ICs Digital ICs  1 Analog ICs accept and output analog data through its pins. Digital ICs deal with only logic data inputs and outputs.  2 Almost every ... IC for dedicated application. Works with TTL logic level and works in voltage range of 0-5V only.

Explain the working of auto-transformer and state any two advantages of it.

Description : Explain the working of auto-transformer and state any two advantages of it. 

Last Answer : Working of auto transformer :-It is a transformer with one winding only, part of this being common to both primary and secondary. In this transformer the primary and secondary are not electrically ... are less, so the efficiency of auto transformer is higher than that of two winding transformer.

Define transformation ratio of a transformer.

Description : Define transformation ratio of a transformer.

Last Answer : Transformation Ratio (K) of a transformer: 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. OR

Define: (i) Efficiency (ii) Voltage regulation of transformer.

Description : Define: (i) Efficiency (ii) Voltage regulation of transformer.

Last Answer : i) Efficiency : It is the ratio of output power to the input power of the transformer.It is denoted by η. ii) Voltage Regulation of transformer: The ratio of the change in Secondary Terminal ... So where, VNL = No Load Secondary voltage VFL = Full load secondary voltage

Write emf equation of a transformer.

Description : Write emf equation of a transformer.

Last Answer : E.M.F equation of transformer is given by where Фm= Maximum value of ac flux linking with primary and secondary winding. f = frequency of applied ac signal N= number of turns on primary or ... in primary = E1=4.44 Фm f N1volts  Voltage induced in primary = E2=4.44 Фm f N2volts

State the working principle of I ø transformer.

Description : State the working principle of I ø transformer.

Last Answer : Working principle of transformer : Transformer works on the principle of mutual electromagnetic induction. When AC voltage is applied to the primary winding of a transformer it causes ac current to flow ... in the secondary winding. The current flows in the secondary circuit if load is connected.

List any two applications of LED.

Description : List any two applications of LED.

Last Answer : 1) LEDs are used in 7 segment display and dot matrix display. 2) They are used in opto couplers. 3) They are used for indicating power ON/OFF conditions. 4) They are used in infrared remote controls. 5) They are used as indicators in various electronic circuits.

Explain the operation of transistor as a switch and as an amplifier, with neat circuit diagrams.

Description : Explain the operation of transistor as a switch and as an amplifier, with neat circuit diagrams. 

Last Answer : Explanation of transistor as a switch: The transistor can be used for two types of application viz. amplification and switching. For the amplification, transistor is biased in its active region. ... results in a large output voltage, which shows that the transistor works as an amplifier.

Explain the operation of a full wave bridge rectifier with π filter using a neat diagram. Draw input and output waveforms.

Description : Explain the operation of a full wave bridge rectifier with π filter using a neat diagram. Draw input and output waveforms.

Last Answer : During positive half-cycle of input, the secondary voltage VAB is positive, so diodes D1 and D2 forward biased and D3 and D4 reverse biased. The load current flows from terminal A ... smooth DC voltage appears across the load. The input and output waveforms are shown in the figure.

List any 4 advantages and any 4 disadvantages of Integrated circuits.

Description : List any 4 advantages and any 4 disadvantages of Integrated circuits.

Last Answer : Advantages of Integrated circuits:- 1. Extremely small size. 2. Very small weight . 3. Very low cost . 4. More reliable . 5. Lower power consumption . 6. Easy replacement ... achieved.  9.Large value of saturation resistance of transistors. 10.Voltage dependence of resistor and capacitors.

Draw the output characteristics of BJT in CE configuration and label various regions on it.

Description : Draw the output characteristics of BJT in CE configuration and label various regions on it.

Last Answer :  output characteristics of BJT in CE configuration 

State the applications of BJT.

Description : State the applications of BJT.

Last Answer : Applications of BJT: 1. As a switch 2. As an amplifier 3. As a multivibrator 4. As a oscillator 5. As a timer circuit 6. As a Logic circuits 7. Delay circuits

Draw the block diagram of regulated power supply.

Description : Draw the block diagram of regulated power supply.

Last Answer : Block diagram of regulated power supply:

Define filter and state it’s types.

Description : Define filter and state it’s types.

Last Answer : A filter circuit may be defined as a circuit, which removes (or minimizes)the unwanted a.c. component of the rectifier output and allows only the d.c. component to reach the load. Types of filters 1) ... 2) Choke input filter(series inductor filter) 3) LC filter 4) π Filter 5) RC filter

List different types of resistors and capacitors.

Description : List different types of resistors and capacitors.

Last Answer : Types of Resistors: 1. Carbon Composition resistor 2. Thin film resistor 3. Thick film resistor 4. Wire wound resistor 5. Thermistor 6. LDR 7. Photo resistor Types of capacitors: 1 ... capacitor 2. Variable capacitor 3. Air ganged capacitor 4. PVC ganged capacitor 5. Trimmer capacitor

Explain statically induced EMF and Dynamically induced EMF with neat diagrams.

Description : Explain statically induced EMF and Dynamically induced EMF with neat diagrams.

Last Answer : Statically Induced EMF:- When changing magnetic field links with a stationary coil an emf is induced. This emf is called statically induced emf. Statically induced EMF is of two types: Self-induced ... cuts the field and an emf is induced. This emf is called dynamically induced emf.    

Define FHP motor and list various types.

Description : Define FHP motor and list various types.

Last Answer : Any motor rated less than one horse power may be called as fractional horse power motors(FHP) various types of FHP motors are: 1.Split phase induction motor 2. Capacitor start induction motor 3. Capacitor start capacitor run induction motor 4. Shaded pole induction motor. 

Write the relation between RMS value and Average value.

Description : Write the relation between RMS value and Average value.

Last Answer : The ratio of RMS value to average value is called the form factor of an alternating quantity.

Define (i) Permeability (ii) Reluctance.

Description : Define (i) Permeability (ii) Reluctance.

Last Answer : Permeability: The capability of the magnetic material to conduct the magnetic flux is known as permeability (OR) It is defined as ratio of magnetic flux density B in a medium to the magnetic flux intensity ... as the property of a material due to which it opposes the creation of magnetic flux in it.

Define EMF and state its unit.

Description : Define EMF and state its unit.

Last Answer : Electromotive force(EMF): A potential difference generated by a source of electrical energy across its terminals which tends to produce an electric current in a circuit is called electromotive force. Unit of EMF is Volt

Draw: (i) Input characteristics of transistor in CE mode. (ii) Output characteristics of transistor in CE mode and show different regions on it.

Description : Draw: (i) Input characteristics of transistor in CE mode. (ii) Output characteristics of transistor in CE mode and show different regions on it.

Last Answer : (i) Input characteristics of transistor in CE mode.   (ii) Output characteristics of transistor in CE mode and show different regions on it.  

Draw and explain: bridge rectifier with shunt capacitor filter.

Description : Draw and explain: bridge rectifier with shunt capacitor filter.

Last Answer : Operation of bridge rectifier with capacitor filter is explained in different intervals with the help of the following wave form. Operation in interval at 0 to A: ... filter is very close to theideal dc voltage waveform as most of the ripple is removed from rectified output.

Explain ideal voltage source with suitable diagram.

Description : Explain ideal voltage source with suitable diagram.

Last Answer : A voltage source is a two terminal device which can maintain a fixed voltage. An ideal voltage source can maintain the fixed voltage independent of the load resistance or the output current. ... the terminal voltage remains constant equal to V volts without load (RL = ∞) or with load

State the need for filters and list the different types of filters.

Description : State the need for filters and list the different types of filters.

Last Answer : Need for filters 1) Output of all rectifiers is pulsating dc voltage and most of citcuits which work on dc requires pure dc voltage. 2) So in order to get pure dc waveform, filters are connected at the ... 2) Choke input filter(series inductor filter) 3) LC filter 4) π Filter 5) RC filter

List the different transistor configurations.

Description : List the different transistor configurations.

Last Answer : The three different transistor configurations are, 1. Common emitter configuration(CE) 2. Common base configuration(CB) 3. Common collector configuration(CC)

State why transistor is called as a bipolar device.

Description : State why transistor is called as a bipolar device.

Last Answer : In case of transistor (BJT), the current conduction takes place due to both electrons and holes, ie, due to both positive as well as negative polarity charge carriers. Therefore transistor is called a bipolar device. 

Define passive components and classify them.

Description : Define passive components and classify them.

Last Answer : Passive components: The components which by themselves are not capable of amplifying (or processing) electrical signals are known as passive components. They require external energy source for their functioning. These are bidirectional devices.  Classification: Resistors, Capacitors, Inductors etc.

State Faraday's first and second law of electromagnetic induction.

Description : State Faraday's first and second law of electromagnetic induction.

Last Answer : i)Faraday's First Law: Whenever a conductor cuts the magnetic lines of force or is cut by the magnetic lines of force or flux linking with conductor changes, an emf is induced in the conductor.  ... Law: The magnitude of induced emf is directly proportional to the rate of change of flux.

State the types of single phase induction motors.

Description : State the types of single phase induction motors.

Last Answer : The types of single phase induction motors are: i) Resistance split phase induction motor. ii) Capacitor split phase inductor motor. a. Capacitor start induction run motor b. permanent capacitor motor c. capacitor start capacitor run induction motor iii) Shaded pole induction motor.

Define: (i) Inductive reactance (ii) Impedance.

Description : Define: (i) Inductive reactance (ii) Impedance.

Last Answer : i) Inductive reactance: Inductive reactance is the opposition offered by an inductor to alternating current . It is denoted by XL and given by XL = 2πf LΩ = ωL Ω ii)Impedance: It is the total opposition offered to flow of AC current in an AC circuit. It is denoted by Z and the unit is ohm. 

With the help of waveforms and phasor diagrams, show the phase relationship between voltage and current in pure inductive circuit.

Description : With the help of waveforms and phasor diagrams, show the phase relationship between voltage and current in pure inductive circuit.

Last Answer : Phasor Diagram:  

List the types of induced emf.

Description : List the types of induced emf.

Last Answer : The types of induced emf are : i) Statically induced emf , ii) Dynamically induced emf

Define: (i) Electromagnetism (ii) Magnetic flux.

Description : Define: (i) Electromagnetism (ii) Magnetic flux.

Last Answer : i)Electromagnetism : It is the magnetism generated by electricity. OR  It is defined as the phenomenon associated with electric and magnetic fields and their interactions with each other. ii) Magnetic flux : The total number of magnetic lines of force in a magnetic field is called magnetic flux.

The electrical schematic shown in the illustration represents a/an ____________. EL-0017 A. across-the-line starter B. primary-resistor starter C. autotransformer starter D. part-winding starter

Description : The electrical schematic shown in the illustration represents a/an ____________. EL-0017 A. across-the-line starter B. primary-resistor starter C. autotransformer starter D. part-winding starter

Last Answer : Answer: A

Which of the listed types of motor controllers and starters is illustrated? EL-0080 A. Across-the-line B. Primary-resistor C. Autotransformer D. Part-winding

Description : Which of the listed types of motor controllers and starters is illustrated? EL-0080 A. Across-the-line B. Primary-resistor C. Autotransformer D. Part-winding

Last Answer : Answer: C

As shown in the illustration, which of the listed types of motor controllers and starters is indicated? EL-0012 A. Across-the-line B. Capacitor C. Autotransformer D. Part-winding

Description : As shown in the illustration, which of the listed types of motor controllers and starters is indicated? EL-0012 A. Across-the-line B. Capacitor C. Autotransformer D. Part-winding

Last Answer : Answer: C

Compare auto transformer with two winding transformer.

Description : Compare auto transformer with two winding transformer.

Last Answer : Autotransformer and Two winding transformer

Compare core type transformer and shell type transformer on the following parameters. (i) Types of winding used, (ii) Application

Description : Compare core type transformer and shell type transformer on the following parameters. (i) Types of winding used, (ii) Application

Last Answer : Ans:

The electrical schematic illustrated in figure A, depicts a/an _____________. EL-0059 A. autotransformer B. Delta Wye transformer C. primary EMF generator D. potential transformer

Description : The electrical schematic illustrated in figure A, depicts a/an _____________. EL-0059 A. autotransformer B. Delta Wye transformer C. primary EMF generator D. potential transformer

Last Answer : Answer: D

The diagram shown in the illustration represents a/an _____________. EL-0082 A. stepup transformer B. magnetic amplifier C. autotransformer D. Scott-connected transformer

Description : The diagram shown in the illustration represents a/an _____________. EL-0082 A. stepup transformer B. magnetic amplifier C. autotransformer D. Scott-connected transformer

Last Answer : Answer: A

The voltage at the reference electrode of the circuit shown in the illustration is applied to the input of a/an ______________. EL-0090 A. class A detector whose output drives an autotransformer B. operational amplifier whose output controls a step-up voltage reactor C. amplitude modulator whose output drives an 2-stage isolation transformer D. magnetic amplifier whose output controls a saturable reactor

Description : The voltage at the reference electrode of the circuit shown in the illustration is applied to the input of a/an ______________. EL-0090 A. class A detector whose output drives an ... drives an 2-stage isolation transformer D. magnetic amplifier whose output controls a saturable reactor

Last Answer : Answer: D

State any two applications of single phase autotransformer.

Description : State any two applications of single phase autotransformer.

Last Answer : Applications of single phase auto transformers: 1) Give small boost to distribution cable to correct the voltage drop. 2) As auto transformer starter for induction motors. 3) As furnace supply ... . 5) In control equipment for single phase locomotives. 6) As dimmer in lighting circuits.

An autotransformer is equipped with a 50% tap, a 65% tap, and an 80% tap. Which of the following statements is true concerning a load connected to the 50% tap? A. The load is receiving minimum voltage and minimum current. B. The load is receiving minimum voltage and maximum current. C. The load is receiving maximum voltage and minimum current. D. The load is receiving maximum voltage and maximum current.

Description : An autotransformer is equipped with a 50% tap, a 65% tap, and an 80% tap. Which of the following statements is true concerning a load connected to the 50% tap? A. The load is ... is receiving maximum voltage and minimum current. D. The load is receiving maximum voltage and maximum current.

Last Answer : Answer: B

Most three-phase induction motors of five horsepower or less, are started by _____________. A. autotransformer starters B. resistor starters C. across-the-line starters D. reactor starters

Description : Most three-phase induction motors of five horsepower or less, are started by _____________. A. autotransformer starters B. resistor starters C. across-the-line starters D. reactor starters

Last Answer : Answer: C

The device shown in the illustration is a/an ____________. EL-0083 A. noise filtering choke B. autotransformer C. fluorescent light ballast D. power factor correction inductor

Description : The device shown in the illustration is a/an ____________. EL-0083 A. noise filtering choke B. autotransformer C. fluorescent light ballast D. power factor correction inductor

Last Answer : Answer: B

Autotransformer starters or compensators are sometimes used with polyphase induction motors to _____________. A. reduce the voltage applied to the motor during the starting period B. increase the voltage for 'across-the-line starting' C. provide a backup means of voltage regulation for emergency starting D. allow the voltage to be either stepped up or down, depending on the application, to ensure full torque

Description : Autotransformer starters or compensators are sometimes used with polyphase induction motors to _____________. A. reduce the voltage applied to the motor during the starting period B. increase the voltage for ' ... to be either stepped up or down, depending on the application, to ensure full torque

Last Answer : Answer: A

In general, polyphase induction motors can be started on full line voltage by means of ______________. A. compensator starters B. autotransformer starters C. across-the-line starters D. primary-resistor starters

Description : In general, polyphase induction motors can be started on full line voltage by means of ______________. A. compensator starters B. autotransformer starters C. across-the-line starters D. primary-resistor starters

Last Answer : Answer: C

Low horsepower, polyphase, induction motors can be started with full voltage by means of _____________. A. compensator starters B. autotransformer starters C. across-the-line starters D. primary-resistor starters

Description : Low horsepower, polyphase, induction motors can be started with full voltage by means of _____________. A. compensator starters B. autotransformer starters C. across-the-line starters D. primary-resistor starters

Last Answer : Answer: C

List the merits of an autotransformer.

Description : List the merits of an autotransformer.

Last Answer : Require less conductor material low cost low size high VA rating high efficiency Better voltage regulation small amount of no load current

Autotransformer

Description : Autotransformer

Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }