Description : The inductance is proportional to the ratio of flux to current. State True/False. a) True b) False
Last Answer : a) True
Description : The resistance in a magnetic material is called as a) Capacitance b) Inductance c) Reluctance d) Magnetic resistance
Last Answer : c) Reluctance
Description : The inductance of a coaxial cable with inner radius a and outer radius b, from a distance d, is given by a) L = μd ln(b/a)/2π b) L = 2π μd ln(b/a) c) L = πd/ln(b/a) d) L = 0
Last Answer : a) L = μd ln(b/a)/2π
Description : Calculate the mutual inductance of two tightly coupled coils with inductances 49H and 9H. a) 21 b) 58 c) 40 d) 49/9
Last Answer : a) 21
Description : The equivalent inductance of two coils with series opposing flux having inductances 7H and 2H with a mutual inductance of 1H. a) 10 b) 7 c) 11 d) 13
Last Answer : b) 7
Description : The expression for the inductance in terms of turns, flux and current is given by a) L = N dφ/di b) L = -N dφ/di c) L = Niφ d) L = Nφ/i
Last Answer : a) L = N dφ/di
Description : The equivalent inductances of two coils 2H and 5H in series aiding flux with mutual inductance of 3H is a) 10 b) 30 c) 1 d) 13
Last Answer : d) 13
Description : Which type of flux will increase the inductance? a) Series aiding b) Series opposing c) Shunt aiding d) Shunt opposing
Last Answer : a) Series aiding
Description : Find the energy of a coil of inductance 18mH and current passing through it 1.25A.(in 10 -3 order) a) 14.06 b) 61 c) 46.1 d) 28.12
Last Answer : a) 14.06
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 : The magnetostatics highly relies on which property? a) Resistance b) Capacitance c) Inductance d) Moment
Last Answer : c) Inductance
Description : Find the turns in an solenoid of inductance 23.4mH , current 2A and area 15cm. a) 900 b) 400 c) 498 d) 658
Last Answer : c) 498
Description : Find the inductance when the energy is given by 2 units with a current of 16A. a) 15.6mH b) 16.5mH c) 16.8mH d) 15.8mH
Last Answer : a) 15.6mH
Description : Find the inductance of a material with 100 turns, area 12 units and current of 2A in air. a) 0.75mH b) 7.5mH c) 75mH d) 753mH
Last Answer : a) 0.75mH
Description : Find the time constant in a series R-L circuit when the resistance is 4 ohm and the inductance is 2 H. a) 0.25 b) 0.2 c) 2 d) 0.5
Last Answer : d) 0.5
Description : Find the inductance of a coil with permeability 3.5, turns 100 and length 2m. Assume the area to be thrice the length. a) 131.94mH b) 94.131mH c) 131.94H d) 94.131H
Last Answer : a) 131.94mH
Description : In the given types of polarisation, which type exists in the semiconductor? a) Electronic b) Ionic c) Orientational d) Interfacial or space charge
Last Answer : d) Interfacial or space charge
Description : Which of the following properties distinguish a material as conductor, insulator and semiconductor? a) Free electron charges b) Fermi level after doping c) Energy band gap d) Electron density
Last Answer : c) Energy band gap
Description : The skin depth is calculated from the amplitude of the wave. State true/false a) True b) False
Description : In P polarisation, the electric field lies in the same plane as the interface. State True/False. a) True b) False
Description : In S polarisation, the electric field lies in the plane perpendicular to that of the interface. State True/False a) True b) False
Description : The Snell law is applicable for perpendicular polarisation and the Brewster law is applicable for parallel polarisation. State True/False. a) True b) False
Description : The angle of incidence is equal to the angle of reflection for perfect reflection. State True/False. a) True b) False
Description : The critical angle is defined as the angle of incidence at which the total internal reflection starts to occur. State True/False. a) True b) False
Description : An elliptically polarised wave transmitted at the Brewster angle will be received as an elliptically polarised wave. State True/False a) True b) False
Last Answer : b) False
Description : A circularly polarised wave transmitted at the Brewster angle will be received as linearly polarised wave. State True/False a) True b) False
Description : The core refractive index should be lesser than the cladding refractive index for a coaxial cable. State True/False a) True b) False
Description : The refractive index of air is unity. State True/False. a) True b) False
Description : The electric and magnetic field components in the electromagnetic wave propagation are in phase. State True/False. a) True b) False
Description : The attenuation in a good dielectric will be non- zero. State True/False. a) True b) False
Description : In free space, the ratio of frequency to the velocity of light gives the phase constant. State True/False. a) True b) False
Description : Harmonic electromagnetic fields refer to fields varying sinusoidally with respect to time. State True/False. a) True b) False
Description : In air, the tangential component of flux density is continuous at the boundary. State True/False. a) True b) False
Description : The tangential component of the magnetic field intensity is continuous at the boundary of separation of two media. State True/False. a) True b) False
Description : In ferromagnetic materials the susceptibility is infinity. State True/False a) True b) False
Description : The magnetic force impacts the energy of the field. State True/false. a) True b) False
Description : Electromagnetic waves are longitudinal in nature. State True/False. a) True b) False
Description : The permeability and permittivity of air or free space is unity. State true/false. a) True b) False
Description : The energy of a coil depends on the turns. State True/False. a) True b) False
Description : The magnetic flux density is directly proportional to the magnetic field intensity. State True/False. a) True b) False
Description : Electric field will be maximum outside the conductor and magnetic field will be maximum inside the conductor. State True/False. a) True b) False
Description : The time varying electric field E is conservative. State True/False. a) True b) False
Description : The induced voltage will oppose the flux producing it. State True/False. a) True b) False
Description : The magnetic field intensity will be zero inside a conductor. State true/false. a) True b) False
Description : The function V = e x sin y + z does not satisfy Laplace equation. State True/False. a) True b) False
Description : The given equation satisfies the Laplace equation. V = x 2 + y 2 – z 2 . State True/False. a) True b) False
Description : On equating the generic form of current density equation and the point form of Ohm’s law, we can obtain V=IR. State True/False. a) True b) False
Description : Dielectric property impacts the behaviour of a material in the presence of electric field. State True/False. a) True b) False
Description : A dielectric is always an insulator. But an insulator is not necessarily a dielectric. State True/False. a) True b) False
Description : Under the influence of electric field, the dielectric materials will get charged instantaneously. State True/False. a) True b) False