Description : The reason for non existence of magnetic monopoles is a) The magnetic field cannot be split b) Due to permeability c) Due to magnetization d) Due to magnetostriction
Last Answer : a) The magnetic field cannot be split
Description : The converse of magnetostriction is called the a) Magnetization b) Magnetic anisotropy c) Villari effect d) Curie effect
Last Answer : c) Villari effect
Description : The inductance is the measure of a) Electric charges stored by the material b) Emf generated by energising the coil c) Magnetic field stored by the material d) Magnetization of dipoles
Last Answer : c) Magnetic field stored by the material
Description : Piezoelectric effect is analogous to which phenomenon? a) Electrostriction b) Magnetostriction c) Anisotropy d) Magnetization
Last Answer : b) Magnetostriction
Description : Find the magnetic moment of a material with magnetization 5 units in a volume of 35 units. a) 7 b) 1/7 c) 15 d) 175
Last Answer : d) 175
Description : Find the magnetization of the material with susceptibility of 6 units and magnetic field intensity of 13 units. a) 2.16 b) 6.2 c) 78 d) 1.3
Last Answer : c) 78
Description : A boundary of separation between two magnetic materials is identified by which factor? a) Change in the permeability b) Change in permittivity c) Change in magnetization d) Conduction
Last Answer : a) Change in the permeability
Description : Find the magnetization of the field which has a magnetic moment 16 units in a volume of 1.2 units. a) 16.67 b) 13.33 c) 15.56 d) 18.87
Last Answer : b) 13.33
Description : The magnetization is defined by the ratio of a) Magnetic moment to area b) Magnetic moment to volume c) Magnetic flux density to area d) Magnetic flux density to volume
Last Answer : b) Magnetic moment to volume
Description : The superconducting materials will be independent of which of the following? a) Magnetic field b) Electric field c) Magnetization d) Temperature
Last Answer : b) Electric field
Description : Calculate the magnetization of a material with susceptibility of 50 and field intensity of 0.25 units. a) 12.5 b) 25 c) 75 d) 37.5
Last Answer : a) 12.5
Description : The charge build up in a capacitor is due to a) Conduction current density b) Displacement current density c) Polarisation d) Magnetization
Last Answer : b) Displacement current density
Description : The line integral of the electric field intensity is a) Mmf b) Emf c) Electric potential d) Magnetic potential
Last Answer : b) Emf
Description : Find the correct relation between current density and magnetization. a) J = Grad(M) b) J = Div(M) c) J = Curl(M) d) M = Curl(J)
Last Answer : c) J = Curl(M)
Description : The expression for magnetization is given by(I-current, A-area, V-volume) a) M = IAV b) M = IA/V c) M = V/IA d) M = 1/IAV
Last Answer : b) M = IA/V
Description : Find the internal field when the applied field is 12 units, molecular field constant is 0.1 units and the magnetization is 74 units. a) 86 b) 62 c) 752 d) 19.4
Last Answer : d) 19.4
Description : When a dielectric loses its dielectric property, the phenomenon is called a) Dielectric loss b) Dielectric breakdown c) Polarisation d) Magnetization
Last Answer : b) Dielectric breakdown
Description : Calculate the emf in a material with flux linkage of 3.5t 2 at 2 seconds. a) 3.5 b) -7 c) -14 d) 28
Last Answer : c) -14
Description : Calculate the emf of a material having flux density 5sin t in an area of 0.5 units. a) 2.5 sin t b) -2.5 cos t c) -5 sin t d) 5 cos t
Last Answer : d) 5 cos t
Description : Calculate the emf of a material having a flux linkage of 2t 2 at time t = 1second. a) 2 b) 4 c) 8 d) 16
Last Answer : b) 4
Description : The induced emf in a material opposes the flux producing it. This is a) Faraday law b) Ampere law c) Lenz law d) Curie law
Last Answer : c) Lenz law
Description : The loss tangent is also referred to as a) Attenuation b) Propagation c) Dissipation factor d) Polarization
Last Answer : c) Dissipation factor
Description : The magnetic energy of a magnetic material is given by a) BH/2 b) B/2H c) H/2B d) B/H
Last Answer : a) BH/2
Description : Which of the following relations is correct? a) MMF = ∫ B.dl b) MMF = ∫ H.dl c) EMF = ∫ E.dl d) EMF = ∫ D.dl
Last Answer : c) EMF = ∫ E.dl
Description : Find the emf induced in a coil of 60 turns with a flux rate of 3 units. a) -60 b) -180 c) 60 d) 180
Last Answer : b) -180
Description : Calculate the emf of a coil with turns 100 and flux rate 5 units. a) 20 b) -20 c) 500 d) -500
Last Answer : d) -500
Description : Find the induced EMF in an inductor of 2mH and the current rate is 2000 units. a) 4 b) -4 c) 1 d) -1
Last Answer : b) -4
Description : The Faraday’s law states about which type of EMF? a) Transformer EMF b) Back EMF c) Generator EMF d) Secondary EMF
Last Answer : a) Transformer EMF
Description : Calculate the emf when a coil of 100 turns is subjected to a flux rate of 0.3 tesla/sec. a) 3 b) 30 c) -30 d) -300
Last Answer : c) -30
Description : Calculate the emf when the flux is given by 3sin t + 5cos t a) 3cos t – 5sin t b) -3cos t + 5sin t c) -3sin t – 5cos t d) 3cos t + 5sin t
Last Answer : b) -3cos t + 5sin t
Description : According to Faraday’s law, EMF stands for a) Electromagnetic field b) Electromagnetic force c) Electromagnetic friction d) Electromotive force
Last Answer : d) Electromotive force
Description : 60)The noise resulting from vibrations of laminations set by magnetic force, is termed as A. magnetostriction B. boo C. hum D. zoom
Last Answer : C. Hum
Description : Which equation will hold good for a magnetic material? a) Line integral of H is zero b) Surface integral of H is zero c) Line integral of B is zero d) Surface integral of B is zero
Last Answer : d) Surface integral of B is zero
Description : The resistance in a magnetic material is called as a) Capacitance b) Inductance c) Reluctance d) Magnetic resistance
Last Answer : c) Reluctance
Description : Find the magnetic field intensity of a material with flux density of 24 units in air(in 10 6 order) a) 19.09 b) 21 c) 25 d) 26.78
Last Answer : a) 19.09
Description : Find the magnetic flux density of the material with magnetic vector potential A = y i + z j + x k. a) i + j + k b) –i – j – k c) –i-j d) –i-k
Last Answer : b) –i – j – k
Description : The capacitance of a material refers to a) Ability of the material to store magnetic field b) Ability of the material to store electromagnetic field c) Ability of the material to store electric field d) Potential between two charged plates
Last Answer : c) Ability of the material to store electric field
Description : The non existence of the magnetic monopole is due to which operation? a) Gradient b) Divergence c) Curl d) Laplacian
Last Answer : b) Divergence
Description : Find the Lorentz force due to a conductor of length 2m carrying a current of 1.5A and magnetic flux density of 12 units. a) 24 b) 36 c) 32 d) 45
Last Answer : c) 32
Description : Find the magnetic field intensity due to a solenoid of length 12cm having 30 turns and current of 1.5A. a) 250 b) 325 c) 175 d) 375
Last Answer : d) 375
Description : Find the magnetic field intensity due to an infinite sheet of current 5A and charge density of 12j units in the positive y direction and the z component is below the sheet. a) 6 b) 0 c) -6 d) 60k
Last Answer : c) -6
Description : Find the magnetic field intensity due to an infinite sheet of current 5A and charge density of 12j units in the positive y direction and the z component is above the sheet. a) -6 b) 12k c) 60 d) 6
Last Answer : d) 6
Description : The property due to which the resistance of some metal or compound vanishes under certain conditions is (A) Semi conductivity. (B) Super conductivity. (C) Curie point. (D) Magnetostriction.
Last Answer : (B) Super conductivity.
Description : In a power transformer, the fundamental frequency of the hum arising due to magnetostriction is (a) equal to the line frequency (b) double the line frequency (c) 4 times the line frequency (d) not related to the line frequency
Last Answer : In a power transformer, the fundamental frequency of the hum arising due to magnetostriction is double the line frequency
Description : Zero permeability/permittivity implies which state? a) No ions are allowed in the medium b) No current is generated in the medium c) No magnetic or electric energy is permitted in the medium d) No resistivity
Last Answer : c) No magnetic or electric energy is permitted in the medium
Description : The magnetic force impacts the energy of the field. State True/false. a) True b) False
Last Answer : a) True
Description : Calculate the energy when the magnetic intensity and magnetic flux density are 15 and 65 respectively. a) 755 b) 487.5 c) 922 d) 645
Last Answer : b) 487.5
Description : Calculate the magnetic energy when the magnetic intensity in air is given as 14.2 units(in 10 -4 order) a) 1.26 b) 2.61 c) 6.12 d) 1.62
Last Answer : a) 1.26
Description : As an armature revolves within a magnetic field, friction is developed between the rotated magnetized particles as they pass through each magnetization cycle. This results in ____________. A. copper loss B. eddy-current loss C. hysteresis loss D. armature reaction
Last Answer : Answer: C
Description : At what portion of the magnetization curve should a magnetic amplifier be operated?
Last Answer : . The knee of the curve.