The value of flux involved in the e.m.f. equation of a transformer is ?

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asked Mar 19, 2018 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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asked Apr 10, 2018 by Narendra

E.M.F equation of a transformer

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The path of magnetic flux in a transformer should have?

Last answer: The path of magnetic flux in a transformer should have low reluctance.

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The leakage flux in a transformer depends upon?

Last answer: The leakage flux in a transformer depends upon load current.

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The use of higher flux density in the transformer design?

Last answer: The use of higher flux density in the transformer design reduces weight per kVA.

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asked May 25, 2018 by anonymous

The maximum flux in a transformer is φm when primary voltage is V and the frequency is f. If the primary

The maximum flux in a transformer is φm when primary voltage is V and the frequency is f. If the primary voltage is 2 V and frequency is f/2, the flux will be (a) 4 φm (b) 0.25 φm (c) φm (d) 0.5 φm

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asked Aug 21, 2019 by anonymous

(a) Define permeability. (b) Define MMF. (c) Define form factor of an alternating quantity. (d) Define frequency and time period of an alternating quality. (e) Define transformation ratio of transformer. (f) State the EMF equation of a 1 transformer and state the meaning of each term used. (g) Give two applications of single phase motors.

Last answer: Permeability : It is the ability of a magnetic/Non magnetic material to allow setting up of flux in it. MMF : The magneto motive force (MMF) is the force required to setup flux in a magnetic / ... applications of single phase motors : Water pumps, ceiling fan, lathe machine

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108 views 1 answer

asked Mar 20, 2018 by anonymous

If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by?

Last answer: If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by Blv.

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149 views 1 answer

asked Apr 9, 2018 by anonymous

The e.m.f. induced in the primary of a transformer: ...

The e.m.f. induced in the primary of a transformer: (A) is in phase with the flux (B) lags behind the flux by 90 degree (C) leads the flux by 90 degree (D) is in phase opposition to that of flux

Last answer: The e.m.f. induced in the primary of a transformer: leads the flux by 90 degree

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458 views 1 answer

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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127 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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asked Mar 19, 2018 by anonymous

The purpose of providing iron core in a step-up transformer is?

Last answer: The purpose of providing iron core in a step-up transformer is to decrease the magnitude of magnetizing current.

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291 views 1 answer

asked Mar 19, 2018 by anonymous

The thickness of laminations used in a transformer is usually?

Last answer: The thickness of laminations used in a transformer is usually 0.4 mm to 0.5 mm.

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68 views 1 answer

asked Mar 19, 2018 by anonymous

The function of conservator in a transformer is?

Last answer: conservator or a reservoir tank for insulating oil in transformer which used for balanced the onload oil level with help of oil level indicator which mount on middle part of reservoir tank.

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asked Mar 19, 2018 by anonymous

The function of breather in a transformer is?

Last answer: The function of breather in a transformer is to arrest flow of moisture when outside air enters the transformer.

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111 views 1 answer

asked Mar 19, 2018 by anonymous

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

Last answer: In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of less than 15A.

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92 views 1 answer

asked Mar 19, 2018 by anonymous

Greater the secondary leakage flux?

Last answer: Greater the secondary leakage flux less will be the secondary induced e.m.f.

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118 views 1 answer

asked Mar 19, 2018 by anonymous

If a transformer is continuously operated the maximum temperature rise will occur in?

Last answer: If a transformer is continuously operated the maximum temperature rise will occur in windings.

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56 views 1 answer

asked Mar 19, 2018 by anonymous

The hum in a transformer is mainly attributed to?

Last answer: The hum in a transformer is mainly attributed to magnetostriction.

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86 views 1 answer

asked Mar 19, 2018 by anonymous

Noise level test in a transformer is a?

Last answer: Noise level test in a transformer is a type test.

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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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79 views 1 answer

asked Mar 19, 2018 by anonymous

The main reason for generation of harmonics in a transformer could be?

Last answer: The main reason for generation of harmonics in a transformer could be saturation of core.

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71 views 1 answer

asked Mar 19, 2018 by anonymous

Which winding in a transformer has more number of turns ?

Last answer: High voltage winding in a transformer has more number of turns.

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116 views 1 answer

asked Mar 19, 2018 by anonymous

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

Last answer: In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

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105 views 1 answer

asked Mar 19, 2018 by anonymous

In a transformer the tappings are generally provided on?

Last answer: In a transformer, the tappings are generally provided on low voltage side.

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56 views 1 answer

asked Mar 19, 2018 by anonymous

In a transformer the resistance between its primary and secondary should be?

Last answer: In a transformer the resistance between its primary and secondary should be infinity.

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101 views 1 answer

asked Mar 19, 2018 by anonymous

No-load current in a transformer?

Last answer: No-load current in a transformer lags behind the voltage by about 75°.

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asked Mar 19, 2018 by anonymous

In a transformer routine efficiency depends upon?

Last answer: In a transformer, routine efficiency depends upon load current and power factor of load.

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asked Mar 19, 2018 by anonymous

In a power or distribution transformer about 10 percent end turns are heavily insulated?

Last answer: In a power or distribution transformer about 10 percent end turns are heavily insulated to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns.

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asked Mar 19, 2018 by anonymous

Which type of winding is used in 3 phase shell-type transformer ?

Last answer: Sandwich type winding is used in 3 phase shell-type transformer.

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asked Mar 19, 2018 by anonymous

The core used in high frequency transformer is usually?

Last answer: The core used in high frequency transformer is usually air core .

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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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asked Mar 19, 2018 by anonymous

Efficiency of a power transformer is of the order of?

Last answer: The efficiency of a power transformer is of the order of 98 percent.

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asked Mar 19, 2018 by anonymous

The maximum efficiency of a distribution transformer is?

Last answer: The maximum efficiency of a distribution transformer is at 50% full load.

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asked Mar 19, 2018 by anonymous

The magnetising current of a transformer is usually small because it has?

Last answer: The magnetising current of a transformer is usually small because it has small air gap.

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asked Mar 19, 2018 by anonymous

The full-load copper loss of a transformer is 1600 W At half-load, the copper loss will be?

Last answer: The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be 400 W.

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asked Mar 19, 2018 by anonymous

The secondary of a current transformer is always short-circuited under operating conditions because it?

Last answer: The secondary of a current transformer is always short-circuited under operating conditions because it avoids core saturation and high voltage induction.

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asked Mar 19, 2018 by anonymous

The efficiency of a transformer, under heavy loads, is comparatively low because?

Last answer: The efficiency of a transformer, under heavy loads, is comparatively low because copper loss becomes high in proportion to the output.

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65 views 1 answer

asked Mar 19, 2018 by anonymous

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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100 views 1 answer

asked Mar 19, 2018 by anonymous

When secondary of a current transformer is open-circuited its iron core will be?

Last answer: When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.

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101 views 1 answer

asked Mar 19, 2018 by anonymous

The chemical used in breather for transformer should have the quality of?

Last answer: The chemical used in breather for transformer should have the quality of cleansing the transformer oil.

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96 views 1 answer

asked Mar 19, 2018 by anonymous

The transformer ratings are usually expressed in terms of?

Last answer: The transformer ratings are usually expressed in terms of kVA.

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214 views 1 answer

asked Mar 19, 2018 by anonymous

The power transformer is a constant?

Last answer: The power transformer is a constant main flux device.

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43 views 1 answer

asked Mar 19, 2018 by anonymous

The noise produced by a transformer is termed as?

Last answer: The noise produced by a transformer is termed as hum.

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77 views 1 answer

asked Mar 19, 2018 by anonymous

The maximum load that a power transformer can carry is limited by its?

Last answer: The maximum load that a power transformer can carry is limited by its voltage ratio.

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104 views 1 answer

asked Mar 19, 2018 by anonymous

If a transformer is switched on to a voltage more than the rated voltage?

Last answer: If a transformer is switched on to a voltage more than the rated voltage its power factor will deteriorate.

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70 views 1 answer

asked Mar 19, 2018 by anonymous

When a given transformer is run at its rated voltage but reduced frequency, its?

Last answer: When a given transformer is run at its rated voltage but reduced frequency, its core flux density is increased.

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78 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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284 views 2 answers

asked Mar 19, 2018 by anonymous

A no-load test is performed on a transformer to determine?

Last answer: A no-load test is performed on a transformer to determine magnetizing current and loss.

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86 views 1 answer

asked Mar 19, 2018 by anonymous

A ferro resonant transformer regulation is also known as?

Last answer: A ferro resonant transformer regulation is also known as constant current transformer.

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71 views 1 answer

anonymous · Answer 1 · 2018-03-19T21:06:12+0000

The value of flux involved in the e.m.f. equation of a transformer is maximum value.

The value of flux involved in the e.m.f. equation of a transformer is ?

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