# For heating a magnetic material using induction heating, the hysteresis and eddy current losses are

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For heating a magnetic material using induction heating, the hysteresis and eddy current losses are respectively proportional to (a) f and f 2 (b) f 2 and f (c) f and f (d) none of the above

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Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

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The hysteresis and eddy current losses of a single phase transformer working on 200 V, 50 Hz supply are Ph and Pe respectively. The percentage decrease in these when operated on a 160 V, 40 Hz supply are   (a) 32, 36 (b) 20, 36 (c) 25, 50 (d) 40, 80

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Draw B-H curve for magnetic material and state its nature. State the significance of hysteresis loop. Also draw the hysteresis loop for hard steel and soft steel.

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Hysteresis and eddy current loss are used in (1) Induction heating of steel (2) Dielectric heating (3) Induction heating of brass (4) Resistance heating

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A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and frequency are doubled, the new core losses are (A) 140 W (B) 180 W (C) 240 W (D) 480 W

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What is the difference between eddy current and hysteresis loss?

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For induction heating, which of the following is abnormally high?  A)Voltage B) Current C) Frequency D) Phase angle

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Explain the hysteresis loop of a magnetic material with neat diagram.

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The effects due to electric current are: I. Magnetic effect II. Heating effect III. Luminous effect Application working on which effect can be used on AC as well as DC supply? a. I only b. II only c. II and III only d. I, II only

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In a magnetic material hysteresis loss takes place primarily due to?

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The frequencies and voltage used in Dielectric heating are (A) 10 – 30 MHz, upto 25 kV (B) 50 – 60 Hz, upto 25 kV (C) 10 – 30 MHz, upto 100 V (D) 50 – 60 Hz, 110 V – 230 V

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The hysteresis loop of magnetic material has an area of 5 cm2 with the scales given as 1 cm=2AT and 1 cm=50 mWb, at 50 Hz, the total hysteresis loss is  (A) 15 W (B) 20 W (C) 25 W (D) 50 W

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Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

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Eddy current losses in transformer cores can be reduced by the use of  1. Solid cores  2. Laminated cores  3. Ferrites  Select the correct answer using the codes given below : (a) 2 and 3 only (b). 1 and 2 only (c) 1 and 3 only (d) 1, 2 and 3

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The eddy current loss in an AC motor is 100 watts at 50 Hz. Its losses at 100 Hz will be: (A) 25 watts (B) 59 watts (C) 100 watts (D) 400 watts

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Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.

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The range of frequencies used in induction heating is :  (A) 0-25 Hz  (C) less than 200 Hz  (B) 50 to 100 Hz  (D) more than 1 kHz

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Advantages eddy current heating

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A 3-phase, 50 Hz, 500 V induction motor develops 20 hp at slip of 5%. Mechanical losses are 1 hp, and stator loss is 1 kW. The efficiency will be   (a) 95.3% (b) 90.5% (c) 91.3% (d) 85.3%

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Draw Hysteresis loop for Hard steel and soft steel. Also write one application of each material.

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Is induction heating safe?

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At a particular temperature and current density, the critical magnetic field for a Type I superconductor is Bc and that for a type II superconductor ranges from Bc1 to Bc2 keeping other parameters unloaded. both superconductors are now subjected to a magnetic field B that satisfies the conditions B>Bc and Bc1 < ... will maintain a vortex state  (d) Type I superconductor will switch to the normal conducting state, while Type II superconductor will maintain a vortex sate

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The best suitable material for the heating element is (a) Tungsten (b) Nichrome (c) Manganin (d) Carbon

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The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

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Dielectric heating is used for heating  A) Wood B)Aluminium C) Magnetic steel D) Copper

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State any two applications of each for the following types of electrical heating : (i) Direct resistance heating(ii) Indirect induction heating (iii) Direct.arc heating (iv) Dielectric heating

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A material for good magnetic memory should have?

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If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be?

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In induction type directional over current relay the driving torque is due to interaction of magnetic fields derived from (A) current in the potential coil (B) both voltage and current in the relay windings (C) directional element and non-directional element (D) non-directional element and the trip circuit

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Two parallel conductors are separated by a distance, d carrying a current, I in the same direction. The magnetic field along a line running parallel to the conductors and midway between them is (A) zero (B) proportional to I (C) proportional to d (D) proportional to the permeability of the medium.

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Choose the correct statement  (a) Digital multimeters are built using current measuring elements, while analog multimeters are built using voltage measuring units (b) Digital multimeters are built using voltage measuring units, while analog multimeters are built using current measuring units (c) Both digital and analog multimeters are built using voltage measuring units (d) Both digital and analog multimeters are built using current measuring units

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When an antenna of input resistance 73 ohm is connected to a 50-ohm line and if the losses are ignored then its efficiency will be nearly   (A) 0.19 (B) 0.81 (C) 0.97 (D) 1.19

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Material which lack permanent magnetic dipoles are known as: (1) Paramagnetic (2) Diamagnetic (3) Ferromagnetic (4) Ferrimagnetic

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Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.

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Eddy current damping cannot be used for moving iron instrument because

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Electric ovens using heating elements made of _________can produce a temperature up to 3000°C. (A) nickel (B) graphite (C) chromium (D) iron

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

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Semiconductor devices are protected by a fuse and the material used is (A) silver (B) gold (C) copper (D) tin

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The reluctance offered by a magnetic material is highest when it is (a) Diamagnetic (b) Paramagnetic (c) Ferromagnetic (d) None of these

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

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What is magnetic hysteresis? What is the cause of hysteresis?

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For a pulse transformer, the material used for its core and the possible turn ration from primary to secondary are respectively   (A) ferrite : 20 : 1 (B) laminated iron : 1 :1 (C) ferrite : 1 : 1 (D) powered iron : 1: 1

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Two non -inverting amplifiers, one having a unity gain and the other having again of twenty are made using identical operational amplifiers. As compared to the unity gain amplifier, the amplifier with gain twenty has

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Hysteresis losses in electrical machines is equal to a. B1.2max f b. B1.6max f c. B1.2min f d. B1.2max fmin