what is transformer ?

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asked Aug 6, 2017 by anonymous

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asked Aug 27, 2019 by anonymous

What is the back E.M.F in Transformer ?

Last answer: Back emf in transformer is when apply voltage in primary side of transformer. This voltage produce flux according to Faraday law electro magnetic induction. This flux called mutual flux and this ... secondary flux oppos the applied voltage according to lenz law. its called back emf of transformer

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118 views 1 answer

asked Jul 24, 2019 by Deepak kumar bharti

What is largest rating transformer

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asked Jun 29, 2019 by anonymous

What is auto transformer

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asked Sep 18, 2018 by anonymous

What is an isolation transformer? State any two applications of isolation transformer.

Last answer: i) Isolation transformers are specially designed transformers for providing electrical isolation between primary & secondary windings. The transformer has primary and secondary windings placed on the common core ... ground: ii) Reduction of voltage spikes iii) It acts as a decoupling device.

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57 views 1 answer

asked Sep 15, 2018 by anonymous

State what is the significance of conducting phasing out test on a 3-phase transformer? Explain its procedure with a suitable connection diagram.

Last answer: -Short primary & secondary winding of other phases expect the one under test. -Connect voltmeter to secondary winding. -A small DC current is circulated through the primary winding through ... . -The test repeated for finding out remaining concerned secondary windings in the same manner.

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1.1k views 2 answers

asked May 13, 2018 by anonymous

What should be kVA rating of each transformer in V-V bank when three phase balanced load is

What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA ? (A) 19 (B) 28 (C) 37 (D) 23

Last answer: What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA ? (A) 19 (B) 28 (C) 37 (D) 23

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193 views 1 answer

asked May 8, 2018 by anonymous

What will happen if the primary of a transformer is connected to D.C. supply?

What will happen if the primary of a transformer is connected to D.C. supply? (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn

Last answer: What will happen if the primary of a transformer is connected to D.C. supply? (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn

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70 views 1 answer

asked Apr 29, 2018 by anonymous

What is a capacitor voltage transformer?

What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems to step up high voltage signals and provide extra high voltage C) It is a transformer used in power systems to step down extra high voltage signals and provide low voltage D) None of these

Last answer: What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... power systems to step down extra high voltage signals and provide low voltage D) None of these

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75 views 1 answer

asked Apr 11, 2018 by anonymous

What is the moving part of a linear variable differential transformer?

What is the moving part of a linear variable differential transformer? a) Primary c) Secondary b) Diaphragm d) Core

Last answer: What is the moving part of a linear variable differential transformer? Core

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153 views 1 answer

asked Apr 5, 2018 by anonymous

What is the basic principle of operation of a transformer?

What is the basic principle of operation of a transformer? (A) Self-induction (B) Mutual-induction (C) Static-induction (D) Dynamic-induction

Last answer: B. Transformer works on principle of MUTUAL INDUCTION. When voltage is applied to the primary winding of the transformer, current flows through the current called magnetising current results in ... . Thus power flow from primary to secondary circuit is simply based on the mutual induction.

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85 views 1 answer

asked Mar 31, 2018 by anonymous

What is the efficiency of transformer compared with that of electrical motors of the same power?

Last answer: Much higher efficiency of transformer compared with that of electrical motors of the same power.

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56 views 1 answer

asked Sep 3, 2017 by anonymous

what is short circuit test in transformer?

Last answer: In short circuit test of transformer the low voltage side is short circuited . On high voltage side the voltmeter is connected in parallel and ammeter in series and also a wattmeter is ... circuit test is done for determining impedance and losses. In this test iron losses is neglected.

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134 views 1 answer

asked Sep 1, 2018 by anonymous

What will be the efficiency when the transformer operates at unity power factor and 60% of full load

Last answer: What will be the efficiency when the transformer operates at unity power factor and 60% of full load 96.5%

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137 views 1 answer

asked May 8, 2018 by anonymous

What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to

What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be excessive (B) Current will be too much high (C) Transformer may start to smoke and burn (D) No effect

Last answer: What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be ... will be too much high (C) Transformer may start to smoke and burn (D) No effect

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485 views 1 answer

asked Oct 5, 2017 by anonymous

what are the causes of noise in transformer?

Last answer: Transformer noise is generated due to vibration of core and winding this is because of magnetostriction and magnetomotive force.

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101 views 1 answer

asked Aug 15, 2017 by anonymous

what are the uses of current transformer ?

Last answer: Uses of current transformer are as follows :A current transformer is use to measure Alternating current.A current transformer is used in meters.A current transformer is used in ammeters. ... .Current transformer is use with circuit breaker.Current transformer is use for overcurrent fault protection.

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79 views 1 answer

asked Aug 6, 2017 by anonymous

what are the types of transformer ?

Last answer: Power transformer, instrument transformer, pulse transformer, RF transformer, IF transformer, audio transformer, distribution transformer etc. are the types of transformer.

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179 views 1 answer

asked May 15, 2020 by anonymous

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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138 views 1 answer

asked Apr 16, 2020 by bos

What is the efficiency of this transformer on full and half load.

1.) A 500kVA transformer has a primary winding resistance of 0.85Ω and a secondary winding resistance of 0.0025Ω. The primary and secondary voltages are 4.5kV and 600V, respectively. The iron loss is 6kW. If the power factor of the load is 0.75, determine the efficiency of the transformer on full load, and on half load.

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asked Jun 28, 2019 by anonymous

What is the colour of silica gel in transformer?

Options: A) Yellow B) No colour C) White D) Blue

Last answer: Correct Answer: D) Blue

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52 views 1 answer

asked Oct 1, 2018 by LAKKU ASHOK REDDY

What is the theory for load test on a single phase transformer?

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asked Apr 23, 2018 by anonymous

What is the line current of a circuit when the current transformer of 1000 : 5 rating measures 4 amp?

What is the line current of a circuit when the current transformer of 1000 : 5 rating measures 4 amp? (A) 5000 amp (B) 1000 amp (C) 400 amp (D) 800 amp

Last answer: What is the line current of a circuit when the current transformer of 1000 : 5 rating measures 4 amp? (A) 5000 amp (B) 1000 amp (C) 400 amp (D) 800 amp

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2.5k views 1 answer

asked Mar 27, 2018 by anonymous

The no-load current drawn by transformer is usually what per cent of the full-load current ?

Last answer: 5 to 8 percentage of full load current

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156 views 2 answers

asked Mar 15, 2018 by anonymous

What is an auto transformer starter?

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48 views 0 answers

asked Mar 10, 2018 by anonymous

What is impulse voltage of transformer?

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asked Dec 22, 2017 by anonymous

What is the EMF equation of the transformer?

Last answer: E1 =2(3.142)fN1 (flux)1E2 =2(3.142)fN2(flux)2

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122 views 1 answer

asked Dec 17, 2017 by anonymous

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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115 views 1 answer

asked Aug 19, 2017 by anonymous

what is mean by rotating transformer ?

Last answer: Induction motor is a rotating transformer

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76 views 1 answer

asked Apr 27, 2018 by anonymous

To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ?

Last answer: To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ? Δ-Δ connection

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317 views 1 answer

asked Mar 19, 2018 by anonymous

what do not change in transformer?

Last answer: Frequency and power are constant in transformers. Suppose we apply 50 Hz input frequency then the output frequency will also be 50 Hz whether the transformer is step up or step down. Similar ... is decreased on secondary side and hence power on primary side and secondary side remains constant.

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76 views 1 answer

asked Feb 17, 2018 by anonymous

What are the design constraints of transformer design?

Last answer: Design constraints of transformer design: Core loss, flux density, copper loss and total power loss vs flux density these are the basic constraints in transformer design. Core loss: Flux density: Copper loss: Total power loss vs flux density:

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88 views 1 answer

asked Mar 30, 2020 by anonymous

Induced emf in the primary of transformer is equal to terminal voltage applied at primary

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41 views 0 answers

asked Aug 22, 2019 by Iqrima

Transformer is 180 degree phase shifting device.pls explain

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101 views 0 answers

asked Aug 13, 2019 by Alacrity

the volt per turn of a certain single phase transformers is 1.7. the transformer has a step ratio of 3825/255volt. calculate the respective number of turns in each winding

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49 views 0 answers

asked Oct 15, 2018 by anonymous

In Scott connection transformer the turns ratio of main winding and teaser winding is ?

Last answer: Turns ratio= N1/ N2 IN Scott connection Main transformer turns ratio = N1 /N2 Teaser transformer turns ratio= 0.866N1/N2 Where N1= number of turns in primary winding N2= number of turns in secondary winding

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123 views 1 answer

asked Sep 18, 2018 by anonymous

Give the criteria for selection of distribution transformer as per IS:10028 (part-I) 1985.

Last answer: Criteria for selection of distribution transformer as per IS:10028 (part-I) 1985: 1) Total connected load. 2) Load Diversity factor. 3) Expected daily load curve. 4) Type of loads: ( ... or trends or forecasting. 10) Ambient conditions for deciding insulation class. 11) Tap changing requirement.

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165 views 1 answer

asked Sep 18, 2018 by anonymous

Give the specification of three phase transformer as per IS 1180(Part-1) 1989.

Last answer: Specification of 3-phase transformer: 1) kVA rating of transformer 2) Voltage ratings for the primary and secondary voltages 3) HV and LV currents 4) Operating frequency of the transformer 5) % impedance of ... the manufacturer 16) Weight of core 17) Weight of winding 18) Volume of oil in litres.

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69 views 1 answer

asked Sep 2, 2018 by anonymous

Write any four points that state how a traction transformer is different from ordinary transformer.

Last answer: Ans: 1) Specially designed to withstand severe operating conditions. 2) Are required to have high short time peak capacity. 3) Class A insulation , specially reinforced to withstand frequent short circuits. 4) Can ... effect of SC impedance not less than 8.5 % for 10 MVA and 10 % for 12.5 MVA.

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42 views 1 answer

asked Sep 1, 2018 by anonymous

A single phase 230 V/ 150 V , 1 kVA, 50 Hz transformer is supplied by 230 V AC supply. Find the full load primary and secondary current.

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asked Sep 1, 2018 by anonymous

KVA of an Auto-transformer of V1/V2 = 220/150 for a load of 100KVA is:

KVA of an Auto-transformer of V1/V2 = 220/150 for a load of 100KVA is: a. 100KVA b. 50KVA c. 33.3KVA d. 20KVA

Last answer: KVA of an Auto-transformer of V1/V2 = 220/150 for a load of 100KVA is: a. 100KVA b. 50KVA c. 33.3KVA d. 20KVA

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1.5k views 1 answer

asked May 13, 2018 by anonymous

A d.c. voltage of 230 V is imposed on an unloaded 230 V, 50 Hz transformer, it will

A d.c. voltage of 230 V is imposed on an unloaded 230 V, 50 Hz transformer, it will (A) give high secondary voltage (B) burn out (C) give secondary voltage as per k (D) None of these

Last answer: A d.c. voltage of 230 V is imposed on an unloaded 230 V, 50 Hz transformer, it will burn out

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60 views 1 answer

asked May 12, 2018 by anonymous

The transformer which transforms unbalanced line to a balanced line is better known as

The transformer which transforms unbalanced line to a balanced line is better known as (A) Impedance transformer (B) Amplifier (C) Balun (D) Oscillator

Last answer: The transformer which transforms unbalanced line to a balanced line is better known as Balun

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53 views 1 answer

asked Apr 30, 2018 by anonymous

A transformer operates 24 hours day at full -load. It's full -load efficiency is :

A transformer operates 24 hours day at full -load. It's full -load efficiency is : (A) equal all day efficiency (B) more than all -day efficiency (C) less than all -day efficiency (D) equal to maximum efficiency

Last answer: A transformer operates 24 hours day at full -load. It's full -load efficiency is : equal all day efficiency

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160 views 1 answer

asked Apr 29, 2018 by anonymous

Which of the following is true with an auto transformer?

Which of the following is true with an auto transformer? A) It has only one winding B) It has two separate windings namely primary winding and secondary winding C) It has two primary windings and one single secondary winding D) None of these

Last answer: Which of the following is true with an auto transformer? A) It has only one winding B) It has two separate windings namely primary winding and secondary winding C) It has two primary windings and one single secondary winding D) None of these

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67 views 1 answer

asked Apr 28, 2018 by anonymous

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%

Last answer: When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is 73.2%

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71 views 1 answer

asked Apr 28, 2018 by anonymous

The main purpose of using core in a transformer is to

The main purpose of using core in a transformer is to (A) decrease iron losses (B) eliminate magnetic hysteresis (C) reduce reluctance of the common magnetic circuit (D) prevent eddy current loss

Last answer: The main purpose of using core in a transformer is to reduce reluctance of the common magnetic circuit

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830 views 1 answer

asked Apr 25, 2018 by anonymous

A 1100 kVA, 11 kV/1.1 kV conventional two-winding transformer is connected as a 12.1 kV/11 kV step-down ...

A 1100 kVA, 11 kV/1.1 kV conventional two-winding transformer is connected as a 12.1 kV/11 kV step-down auto-transformer. The rating of the auto-transformer is (A) 1000 kVA (B) 1100 kVA (C) 11000 kVA (D) 12100 kVA

Last answer: A 1100 kVA, 11 kV/1.1 kV conventional two-winding transformer is connected as a 12.1 kV/11 kV step-down auto-transformer. The rating of the auto-transformer is 12100 kVA

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77 views 1 answer

asked Apr 25, 2018 by anonymous

The main application of delta/zig-zag connected 3-phase transformer is to supply

The main application of delta/zig-zag connected 3-phase transformer is to supply (A) balanced loads (B) unbalanced loads (C) furnace loads (D) single-phase loads

Last answer: The main application of delta/zig-zag connected 3-phase transformer is to supply unbalanced loads

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73 views 1 answer

asked Apr 25, 2018 by anonymous

The power transformer is a

The power transformer is a (a) Constant current device (c) Constant power device (b) Constant voltage device (d) Pulsating main flux device

Last answer: The power transformer is a Pulsating main flux device

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35 views 1 answer

asked Apr 12, 2018 by anonymous

Transformer oil is used as ________.

Transformer oil is used as ________. A. Doping Element B. Coolant C. Power booster D. None

Last answer: Transformer oil is used as Coolant.

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85 views 1 answer

Nilakantha Bihari · Answer 1 · 2017-09-02T09:40:27+0000

Transformer is a device which is used to convert AC electricity from one voltage to another voltage without any change in frequency .

what is transformer ?

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