What is an auto transformer starter?

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asked Mar 15, 2018 by anonymous

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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 May 3, 2018 by anonymous

Auto reclosing is used in case of

Last answer: Auto reclosing is used in case of air blast C.B.

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71 views 1 answer

asked Mar 20, 2018 by anonymous

A three point starter is considered suitable for?

Last answer: A three point starter is considered suitable for shunt as well as compound motors.

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76 views 1 answer

asked Mar 20, 2018 by anonymous

A direct online starter is used for starting motors?

Last answer: A direct online starter is used for starting motors up to 5 H.P.

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59 views 1 answer

asked Mar 20, 2018 by anonymous

For starting a D.C. motor a starter is required because?

Last answer: For starting a D.C. motor a starter is required because it limits the starting current to a safe value.

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62 views 1 answer

asked Mar 20, 2018 by anonymous

Three point starter can be used for?

Last answer: Three point starter can be used for both shunt and compound motor.

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asked Mar 15, 2018 by anonymous

Why starter is required for starting an induction motor?

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asked Mar 10, 2018 by anonymous

What is the best Arduino starter kit?

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60 views 0 answers

asked Nov 30, 2017 by anonymous

what is the difference between four point starter and three point starter?

Last answer: The only difference is in the NO VOLT COIL connection in the starter, in three point starter NVC is connected to the field whereas in four point starter it is connected separately. The advantage of using ... (for above rated speed) and lead to DEENERGISE the NVC leading to turning off of the motor.

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87 views 1 answer

asked Jun 29, 2019 by anonymous

What is auto transformer

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asked Mar 15, 2018 by anonymous

Which type of starter is used to start the DC motor?

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asked May 22, 2020 by anonymous

Explain the necessity of starter for D.C. motor. State various types of D.C. motor starter.

Last answer: Necessity of Starter for D.C. Motor: Armature current is given by equation Ia = (V−Eb)/Ra i) If the motor is at standstill or rest, back emf Eb is zero (as Eb= ZNP/(60A), at start speed N ... . Types of D.C. motor starters: i) Two point starter ii)Three point starter iii) Four point starter

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80 views 1 answer

asked Jul 30, 2019 by anonymous

Draw the wiring diagram of fluorescent tube. Explain the working of choke and starter.

Last answer: Fluorescent lamp:- Operation:- When switch is ON current flows through the choke-filament no1- starter-filament no. 2- to neutral, At that time choke induces high voltage which is applied to ... at the time of starting. ii) Starter: To make and break the circuit to start the tube.

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2.5k views 1 answer

asked Sep 23, 2018 by anonymous

State any four advantages of soft starter.

Last answer: Advantages of soft starter: 1. Very low line voltage drops on motor operation 2. Reduced energy losses in the lines 3. System efficiency increases 4. Very smooth starting & operation 5. As ... may lead to lower MD billing. 13. Less mechanical maintenance. 14. Saving in operating costs.

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106 views 1 answer

asked Sep 18, 2018 by anonymous

State function of starter and ELCB. (Earth Leakage Circuit Breaker)

Last answer: i) Function of Starter:- 1. To prevent the high starting current OR to minimize the starting current. 2. To give supply failure protection 3. To give over load and short circuit protection ... an installation and cut off the circuit from power supply and avoid electrical shock to the person.

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370 views 1 answer

asked Mar 20, 2018 by anonymous

In a manual shunt motor starter?

Last answer: In a manual shunt motor starter over load relay is connected in series and no volt relay in parallel with the load.

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46 views 1 answer

asked Jul 26, 2019 by anonymous

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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107 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 May 1, 2018 by anonymous

The desirable properties of transformer core material are

The desirable properties of transformer core material are (1) low permeability and low hysteresis loss. (2) high permeability and high hysteresis loss. (3) high permeability and low hysteresis loss. (4) low permeability and hysteresis loss.

Last answer: The desirable properties of transformer core material are high permeability and low hysteresis loss.

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125 views 1 answer

asked Jun 18, 2018 by anonymous

An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to

An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V

Last answer: An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V

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120 views 1 answer

asked Mar 19, 2018 by anonymous

The purpose of providing an iron core in a transformer is to?

Last answer: The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.

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83 views 1 answer

asked Mar 19, 2018 by anonymous

An ideal transformer has infinite values of primary and secondary inductances. The statement is?

Last answer: An ideal transformer has infinite values of primary and secondary inductances. The statement is false.

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134 views 1 answer

asked Mar 19, 2018 by anonymous

An ideal transformer is one which has?

Last answer: An ideal transformer is one which has no losses and magnetic leakage.

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68 views 1 answer

asked Mar 19, 2018 by anonymous

An open-circuit test on a transformer is conducted primarily to measure?

Last answer: The open-circuit test in a transformer is used to measure

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268 views 2 answers

asked May 22, 2020 by anonymous

State why a transformer always have an efficiency of more than 90%.

Last answer: As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.

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31 views 1 answer

asked Mar 21, 2018 by anonymous

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a?

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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120 views 1 answer

asked Mar 19, 2018 by anonymous

The no load current in a transformer lags behind the applied voltage by an angle of about?

Last answer: The no load current in a transformer lags behind the applied voltage by an angle of about 75°.

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77 views 1 answer

asked Mar 19, 2018 by anonymous

In an actual transformer the iron loss remains practically constant from no load to full load because?

Last answer: In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.

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76 views 1 answer

asked Mar 19, 2018 by anonymous

An ideal transformer will have maximum efficiency at a load such that?

Last answer: An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.

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asked Mar 14, 2018 by anonymous

Why does a transformer only work with an AC supply?

Last answer: The transformer work depends on the induction as main principle ,for that AC is the right means

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109 views 3 answers

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 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 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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74 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 Mar 10, 2018 by anonymous

What is impulse voltage of transformer?

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56 views 0 answers

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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123 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 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 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 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 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 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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asked May 20, 2018 by anonymous

A 400V/100 V, 10 KVA two-winding transformer is reconnected as an auto-transformer across a suitable

A 400V/100 V, 10 KVA two-winding transformer is reconnected as an auto-transformer across a suitable voltage source. The maximum rating of such an arrangement could be A) 50 KVA B) 15 KVA C) 12.5 KVA D) 8.75 KVA

Last answer: A 400V/100 V, 10 KVA two-winding transformer is reconnected as an auto-transformer across a suitable voltage source. The maximum rating of such an arrangement could be 50 KVA

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78 views 1 answer

asked May 25, 2018 by anonymous

An auto transformer having a transformation ratio of 0.8 supplies a load of 10 kW. The power transferred

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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283 views 0 answers

asked May 8, 2018 by anonymous

An Auto-transformer (which has only one winding) may be used as a ______ .

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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4.9k views 2 answers

asked Aug 22, 2019 by Iqrima

Transformer is 180 degree phase shifting device.pls explain

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asked Jul 27, 2019 by anonymous

State and justify which of the following two transformers is better: Transformer A = 4% voltage regulation Transformer B = 6% voltage regulation

Last answer: Transformer A with 4% voltage regulation is better. Justification: Voltage regulation refers to the percentage change in secondary voltage when load is changed from no-load to full-load with primary voltage ... 4% voltage regulation, which is less as compared to 6% of transformer B, it is better.

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101 views 1 answer

asked Aug 12, 2018 by anonymous

Why Transformer rating is given in kVA?

Last answer: 1) The output of transformer is limited by heating due to the losses. Two types of losses in the transformer (i) Iron loss, (ii) Copper loss. 2) Iron loss depends on the transformer voltage (V). ... by load power factor. - Hence the transformer output is expressed in VA or kVA and not in kW.

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2.7k views 4 answers

What is an auto transformer starter?

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