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Interpole flux should be sufficient to neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil.

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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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Description :

The path of magnetic flux in a transformer should have?

Answer :

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

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Description :

In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will  (1) reduce to one-half (2) reduce to one-fourth (3) remain unchanged (4) increase four times

Answer :

In an induction motor if the flux density is reduced.to one-half, of its normal value then the torque will reduce to one-fourth

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256 views 1 answer
Description :

It is possible to increase the field flux and, at the same time, increase the speed of a d.c. motor provided its .......... is held constant.

Answer :

It is possible to increase the field flux and, at the same time, increase the speed of a d.c. motor provided its armature current is held constant.

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Description :

Flux density formula

Answer :

Flux density formula

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64 views 1 answer
Description :

Define the following terms and state their units: (i) Luminous intensity, (ii) Luminous flux

Answer :

i) Luminous intensity: This is defined as the luminous flux emitted into a solid angle of space in a specific direction. Its unit is the candela.  OR  The luminous flux per unit solid angle ( ... energy radiated by the light source in all direction. The unit of luminous flux is lumen (lm) 

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73 views 1 answer
Description :

Define the following terms: i) Magnetic flux density, ii) Reluctance, iii) Magneto-motive force, iv) Permeance.

Answer :

(i) Magnetic flux density (B): It is the magnetic flux per unit area measured at right angles to the flux path. (Its unit is weber/m2 or tesla).  (ii) Reluctance: It is the ... flux to set up through it and it is reciprocal of reluctance. Permeance = 1/ Reluctance. Unit: weber/ampere.

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133 views 1 answer
Description :

Describe the concept of leakage flux, useful flux and fringing with neat diagram.

Answer :

Leakage Flux

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Description :

Define useful flux, leakage flux and fringing.

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Description :

Explain the leakage flux and its effect with the help of neat diagram.

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Description :

Give the relation between magnetic field strength, magnetic flux density and permeability.

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69 views 0 answers
Description :

Define magnetic flux density and state its formula.

Answer :

The magnetic flux per unit area is called as magnetic flux density. Magnetic flux density is denoted by B. The formula for magnetic flux density is Weber per metre square or Tesla. Mathematically ... the unit of magnetic flux density is Weber per metre square which is also called as Tesla.

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84 views 1 answer
Description :

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as  (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator

Answer :

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator 

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367 views 1 answer
Description :

Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these

Answer :

Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these

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62 views 1 answer
Description :

The property of a material which opposes the creation of magnetic flux in it is known as?

Answer :

The property of a material which opposes the creation of magnetic flux in it is known as reluctance.

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675 views 1 answer
Description :

The unit of magnetic flux is?

Answer :

The unit of magnetic flux is weber.

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Description :

What is the permissible flux density in case of cold rolled grained oriented steel?

Answer :

The permissible flux density in case of cold rolled grained oriented steel is 1.7 Wb/m2.

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117 views 1 answer
Description :

Answer :

Flux density is denoted by B. And it is given as B = flux/ area Where, the unit of flux is Weber and unit of area is meter square. So the unit of flux density is weber per meter square which is also called as Tesla.

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122 views 2 answers
Description :

A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is  (A) 96 V (B) 192 V (C) 384 V (D) 768 V

Answer :

A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is 384 V

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Description :

Answer :

In D.C. generators on no-load, the air gap flux distribution in space is flat topped.

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Description :

The necessary and sufficient condition for a rational function of, T(s) to be driving point impedance of an RC network is that all poles and zeros should be

Answer :

The necessary and sufficient condition for a rational function of, T(s) to be driving point impedance of an RC network is that all poles and zeros should be simple and and lie on the negative axis in the s -plane

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Description :

One of the necessary and sufficient condition for a network function N(s)=p(s)/q(s) to be a transfer function is that  A) The coefficients of the polynomial p(s) and q(s) must be real and those for q(s) must be positive B) Coefficients of p(s) and q(s) must be real and positive C) Coefficients of p(s) must be positive and real but coefficients of q(s) can be negative also D) Degree of p(s) and q(s) may differ by either zero or one only

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Description :

If a healthy freshwater fish is placed in salt water, what will be the expected consequence? (1) The fish becomes dehydrated and dies (2) The fish becomes bloated and dies (3) The fish suffers from fungal or bacterial disease and dies (4) There is no observable effect on the fish provided there is sufficient food

Answer :

The fish becomes dehydrated and dies

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Description :

Answer :

For the parallel operation of two or more D.C. compound generators, we should ensure that series fields of all generators should be either on positive side or negative side of the armature.

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Description :

A dielectric material is said to be linear if the electric flux density varies (A) non-linearly with electric field (B) linearly with electric field (C) linearly with the permittivity (D) non-linearly with electric potential 

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Description :

To become unscientific, it is sufficient Options: A) Irrelevant arguments B) Prejudices C) Disagreement D) All the above

Answer :

D) All the above 

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Description :

Probably the best reminder a beginning teacher might take with him into his class room is Options: A) Knowledge of one's subject is the crucial thing B) Liking children is a necessary and a sufficient condition for effective teaching C) Pupil adjustment is the paramount educational objective D) Learning is effective to the extent that it involves the goals and purposes of individual children

Answer :

D) Learning is effective to the extent that it involves the goals and purposes of individual children

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Description :

A situation where we have people whose level of income is not sufficient to meet the minimum consumption expenditure is considered as (1) Absolute Poverty (2) Relative Poverty (3) Urban Poverty (4) Rural Poverty

Answer :

Absolute Poverty

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Description :

A Barbie doll is available at Ratna stores in salem at 20% discount and the same is available at only 18% discount at Royal stores in attur. Deepika has just sufficient amount of Rs 800 to purchase it at Ratna stores in salem. What is the amount that deepika has less than required amount to purchase it at Royal stores in attur?

Answer :

80%= 800 100%= 1000 when discount 18%,then, SP= 1000-180=820 required difference= 820-800 = Rs. 20

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Description :

Which of the following test is carried out to ensure the sufficient strength of insulation between two or more conductors to avoid leakage between them ?   (a) Testing of insulation resistance between wiring and earth (b) Testing of insulation resistance between conductors (c) Testing of polarity of single phase switch (d) Testing of earth continuity path 

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Answer :

In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilised is called armature.

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Description :

Answer :

If a D.C. generator fails to build up the probable cause could not be field resistance less than the critical resistance.

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Description :

Answer :

If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be crossmagnetisation as well as demagnetising.

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104 views 1 answer
Description :

A point charge of 120 mC is placed at the centre of a cube. What will be the total flux passing through one face of the cube?  A) 120 mC B) 60 mC C) 20 mC D) 30 mC

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Description :

Answer :

A moving-coil permanent-magnet instrument can be used as flux-meter by eliminating the control springs.

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268 views 1 answer
Description :

Consider the following assertion (A) and reason (R) and select the correct code given below: (A) : No man is perfect. (R): Some men are not perfect. (A) Both (A) and (R) are true but (R) does not provide sufficient reason for (A). (B) Both (A) and (R) are true and (R) provides sufficient reason for (A). (C) (A) is true but (R) is false. (D) (A) is false but (R) is true.

Answer :

Answer: A

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Description :

Deductive argument involves (A) sufficient evidence (B) critical thinking (C) seeing logical relations (D) repeated observation

Answer :

(C) seeing logical relations

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Description :

1. India is self sufficient in production of which of the following commodities? 2. Which country is not a member of SAARC? 3. Independent alternation of generation is found in which plant? 4. Because of which factor, clouds do not precipitate in deserts? 5. Which Sikh Gurus started the Gurumukhi script ? 6. What ... power stations in India? 19. Which is the second highest peak in the world? 20. Which Sultan of Delhi introduced measures for improving the quality of fruits?

Answer :

Answer : 1. Milk 2. Mauritius 3. Fern 4. Low humidity 5. Guru Angad 6. India, that is Bharat 7. Reinforced glass 8. French 9. Cirrus cloud 10. Amatya 11. Disposable Personal Income 12. Root ... . Peddana 16. Infrared region 17. Streptomycin 18. Thorium 19. K-2 (Godwin Austin) 20. Firoz shah Tughlaq

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Description :

Why donor and receiver atoms can't move when sufficient voltage is supplied if they have charge Thanks

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Description :

If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?

Answer :

If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be zero.

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Description :

Answer :

A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be about 2 V.

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Answer :

A D.C. generator can be considered as rotating amplifier.

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Answer :

A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.

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Description :

Answer :

In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when number of poles is 2.

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Answer :

For a D.C. machines laboratory following type of D.C. supply will be suitable induction motor D.C. generator set.

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Description :

Answer :

In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be 8.

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147 views 1 answer
Description :

Answer :

The total losses in a well designed D.C. generator of 10 kW will be nearly 500 W.

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Description :

In order to inculcate the ethical values in the researches, it is essential that it should be Options: A) In accordance with the researcher's abilities B) Providing opportunities to the researcher to work freely C) Inculcate maturity in the researcher D) All of the above

Answer :

A) In accordance with the researcher's abilities

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