In transformer, the core is made up of soft iron in order to pass the maximum A. flux B. current C. magnetic flux D. voltage

In transformer, the core is made up of soft iron in order to pass the

maximum

A. flux

B. current

C. magnetic flux

D. voltage


by

1 Answer

Answer :

magnetic flux


by

Related questions

Which of the following iron core electromagnets creates the greatest amount of magnetic flux: w) 1,000 coils, 2 amps of current x) 250 coils, 7 amps of current y) 700 coils, 3 amps of current

Description : Which of the following iron core electromagnets creates the greatest amount of magnetic flux: w) 1,000 coils, 2 amps of current x) 250 coils, 7 amps of current y) 700 coils, 3 amps of current 

Last Answer : ANSWER: Y -- 700 COILS, 3 AMPS OF CURRENT

27] In a transformer, the leakage flux of each winding is proportional to the current in that winding because A. Ohm's law applies to magnetic circuits B. Leakage paths do no saturate C. the two windings are electrically isolated D. mutual flux is confined to the core

Description : 27] In a transformer, the leakage flux of each winding is proportional to the current in that winding because A. Ohm's law applies to magnetic circuits B. Leakage paths do no saturate C. the two windings are electrically isolated D. mutual flux is confined to the core

Last Answer : B. Leakage path do not saturate

The best material for the core of a transformer is – (1) stainless steel (2) mild steel (3) hard steel (4) soft iron

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Last Answer : (4) soft iron Explanation: Iron has a very large magnetic response: it greatly amplifies an applied magnetic field. The transformer's ability to transfer energy depends on the strength of the magnetic ... field is amplified. The input energy can then be lower while still having the same effect.

The best material for the core of a transformer is (1) stainless steel (2) mild steel (3) hard steel (4) soft iron

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Last Answer : soft iron

A direct current passing through a wire coiled around a soft iron core is the description of a simple ____________. A. magnetic shield B. electromagnet C. piezoelectric device D. electromagnetic domain

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[53] The iron loss of the transformer is negligible during short circuit test because A. The entire input is just sufficient to meet Cu losses only B. Flux produced is a small fraction of the normal flux C. Iron core becomes fully saturated D. Supply frequency is held constant

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43 The purpose of providing an iron core in a transformer is to A.Provide support to windings B. Reduce hysteresis loss C. decrease the reluctance of the magnetic path D. reduce eddy current losses

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Last Answer : C. Decrease the reluctance of the magnetic path

Magnitude of induced e.m.f is proportional to A. rate of change of current B. rate of change of voltage C. rate of change of magnetic flux linkage D. rate of change of resistance

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If the Earth's magnetic field lines pass through the Hall probe in opposite direction, then the change in reading of voltmeter is A. thrice the Earth's magnetic flux density B. four times the Earth's magnetic flux density C. five times the Earth's magnetic flux density D. twice the Earth's magnetic flux density

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Last Answer : twice the Earth's magnetic flux density

Ratio of voltages is inverse ratio of the A. transformer B. resistor C. iron core D. current

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Last Answer : current

The harmonic currents in a power transformer does not cause increase in: a) Secondary voltage b) Core loss c) Copper loss d) Magnetic interference with protective relays

Description : The harmonic currents in a power transformer does not cause increase in: a) Secondary voltage b) Core loss c) Copper loss d) Magnetic interference with protective relays

Last Answer : Ans: A

Total number of magnetic field lines passing through an area is called A. magnetic flux density B. magnetic flux C. e.m.f D. voltage

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Last Answer : magnetic flux

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Last Answer : D. Mutual flux

The core flux of a practical transformer with a resistive load

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Last Answer : The core flux of a practical transformer with a resistive load Is strictly constant with load changes

The core of a transformer (medium size) uses to provide high flux densities

Description : The core of a transformer (medium size) uses to provide high flux densities (a) diamagnetic (c) ferromagnetic core (b) paramagnetic (d) none of these

Last Answer : The core of transformer is made up colled rolled grain oriented. It is a ferromagnetic material..

What type of magnets are produce by running electric current through a soft iron core?

Description : What type of magnets are produce by running electric current through a soft iron core?

Last Answer : electromagnet

19 .Transformer cores are built up from laminations rather than from solid metal so that A. Oil penetrates the core more easily B. Eddy current loss is reduced C. Less lamination is required for the windings D. Turn ratio is higher than voltage ratio

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Magnetic keepers are pieces of – (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Description : Magnetic keepers are pieces of – (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Last Answer : (4) Soft iron Explanation: Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.

Magnetic keepers are pieces of (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

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Last Answer :  Soft iron

The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields (a) meter is surrounded by strong magnetic fields (b) a soft iron shielding is used (c) a plastic shielding is provided (d) a shielding of anon-magnetic material is used

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Last Answer : (b) a soft iron shielding is used

If the magnetic flux density and current are at right angles, then component of force acting on the conductor is A. BIL cosθ B. BIL sinθ C. BIL tanθ D. BL sinθ

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For a straight wire, induced current depends uponA. the speed of movement of wire B. the length of wire C. the magnitude of magnetic flux density D. all of above

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The Tesla and the Gauss are units of measure of: w) conductance x) magnetic field strength y) magnetic flux z) electrical current

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

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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.

are used for construction of core of electromagnets. (a) Soft magnetic materials (b) Hard magnetic materials (c) Either (a) or (b) (d) None of the above

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Find the magnetic flux density of a finite length conductor of radius 12cm and current 3A in air( in 10 -6 order) a) 4 b) 5 c) 6 d) 7

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Transformer cores are normally made from (A) Soft ferrites (B) High purity iron (C) Grain oriented Fe-Si alloy (D) Al-Ni-Co alloy

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68 The path of a magnetic flux in a transformer should have A. High resistance B. High reluctance C. Low resistance D. Low reluctance

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The path of the magnetic flux in a transformer has :

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The path of magnetic flux in a transformer should have?

Description : 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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Last Answer : Answer: B

In replacing a defective transformer with a new one, which of the following actions must be carried out to insure proper operation of the equipment it serves? A. The secondary leads must be grounded for 10 minutes to remove static charges. B. The transformer connections must be made as before with regard to the indicated polarity. C. The iron core of the transformer must be flashed to pre-magnetize it. D. The iron core must be grounded for 10 minutes to remove any residual magnetism.

Description : In replacing a defective transformer with a new one, which of the following actions must be carried out to insure proper operation of the equipment it serves? A. The secondary leads must be grounded ... magnetize it. D. The iron core must be grounded for 10 minutes to remove any residual magnetism.

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Of which irom is Core of transformer made up?

Description : Of which irom is Core of transformer made up?

Last Answer : – Soft iron

When an iron piece is placed in a magnetic field (a) the magnetic lines of force will bend away from their usual paths in order to go away from the piece (b) the magnetic lines of force will bend away from their usual paths in order to pass through the piece (c) the magnetic field will not be affected (d) the iron piece will break

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Last Answer : (b) the magnetic lines of force will bend away from their usual paths in order to pass through the piece

Pick out the wrong statement. (A) A ferromagnetic material becomes paramagnetic above the 'Curie temperature' (B) Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials (C) Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces (D) Tungsten steel and alnico are not hard magnetic materials

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A component that allows only unidirectional current to pass through it is A. resistor B. inductor C. transformer D. diode

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What is the core of the transformer made of ?

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Last Answer : The core of the transformer is made of: The core of the transformer is usually made of a type of steel called silicon steel. Transformer cores are not usually made of normal stainless steel.

Which of the listed electrical devices is represented by the symbol shown in the illustration? EL-0055 A. Fixed resistance resistor B. Coil with magnetic core C. DC motor or generator shunt field D. Transformer

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Figure 'B' shown in the illustration represents a/an ____________. EL-0091 A. magnetic amplifier B. Scott-T transformer C. saturable-core reactor D. oil-filled toroid

Description : Figure 'B' shown in the illustration represents a/an ____________. EL-0091 A. magnetic amplifier B. Scott-T transformer C. saturable-core reactor D. oil-filled toroid

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Figure 'A' shown in the illustration represents a/an _______________. EL-0091 A. magnetic amplifier B. Scott-T transformer C. saturable-core reactor D. oil-filled toroid

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72 Harmonics in transformer result in A. Increased core losses B. Increased I2R losses C. Magnetic interference with communication circuits D. All of the above

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Strength of magnetic field of solenoid can be increased by adding core made of A. copper B. ferrous C. silver D. aluminum

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Last Answer : ferrous

6 The value of flux involved in the emf equation of a transformer is A. rms value B. rms value C. Maximum value D. Instantaneous value

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______is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ? (a) Grey cast-iron (b) Cast steel (c) High carbon steel (d) Stainless steel

Description : ______is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ? (a) Grey cast-iron (b) Cast steel (c) High carbon steel (d) Stainless steel

Last Answer : (b) Cast steel

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.

When a transformer is used to step down voltage, the low voltage winding is _____________. A. part of the core B. the primary coil C. not insulated D. the secondary coil

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Last Answer : Answer: D

The voltage applied to the H.V. side of a transformer during S.C. test is 2% of the rated voltage. The core loss

Description : The voltage applied to the H.V. side of a transformer during S.C. test is 2% of the rated voltage. The core loss as the fraction of its rated core loss is (a) 4% (b) 0.4% (c) 0.25% (d) 0.04%

Last Answer : 0.04%

In a transformer, low voltage winding is placed near the core in case of concentric windings so

Description : In a transformer, low voltage winding is placed near the core in case of concentric windings so as to  1. Reduce the leakage flux 2. Reduce the insulation requirement 3. Reduce the risk of voltage shock in case of insulation breakdown 4. Reduce the ... a) 1, 2, 3 (b) 2, 3, 4 (c) 1, 2, 3, 4 (d) 2, 3

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