Description : If ∫ H.dL = 0, then which statement will be true? a) E = -Grad(V) b) B = -Grad(D) c) H = -Grad(Vm) d) D = -Grad(A)
Last Answer : c) H = -Grad(Vm)
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 : The value of ∫ H.dL will be a) J b) I c) B d) H
Last Answer : b) I
Description : An electric field is given as E = 6y 2 z i + 12xyz j + 6xy 2 k. An incremental path is given by dl = -3 i + 5 j – 2 k mm. The work done in moving a 2mC charge along the path if the location of the path is at p(0,2,5) is (in Joule) a) 0.64 b) 0.72 c) 0.78 d) 0.80
Last Answer : b) 0.72
Description : The time varying electric field E is conservative. State True/False. a) True b) False
Last Answer : b) False
Description : The curl of the electric field intensity is a) Conservative b) Rotational c) Divergent d) Static
Last Answer : b) Rotational
Description : When curl of a path is zero, the field is said to be conservative. State True/False. a) True b) False
Last Answer : a) True
Description : The current element of the magnetic vector potential for a surface current will be a) J dS b) I dL c) K dS d) J dV
Last Answer : c) K dS
Description : The magnetic vector potential for a line current will be inversely proportional to a) dL b) I c) J d) R
Last Answer : d) R
Description : In lossy dielectric, the phase difference between the electric field E and the magnetic field H is a) 90 b) 60 c) 45 d) 0
Last Answer : d) 0
Description : Find the current density on the conductor surface when a magnetic field H = 3cos x i + zcos x j A/m, for z>0 and zero, otherwise is applied to a perfectly conducting surface in xy plane. a) cos x i b) –cos x i c) cos x j d) –cos x j
Last Answer : b) –cos x i
Description : When the electric field becomes zero, which of the following relations hold good? a) E = P b) D = P c) B = P d) H = P
Last Answer : b) D = P
Description : Find ∫ for steam at 100 psia and 600°F.If h = 1329.6 and v = 6.216 a. 1214 Btu / lb b. 1234 Btu /lb c. 1342 Btu / lb d. 1324 Btu /lb formula: ∫ = h– pv/ J
Last Answer : 1214Btu / lb
Description : In electromagnetic waves, the electric field will be perpendicular to which of the following? a) Magnetic field intensity b) Wave propagation c) Both H and wave direction d) It propagates independently
Last Answer : c) Both H and wave direction
Description : Which one of the following laws will not contribute to the Maxwell’s equations? a) Gauss law b) Faraday law c) Ampere law d) Curie Weiss law
Last Answer : d) Curie Weiss law
Description : Poisson equation can be derived from which of the following equations? a) Point form of Gauss law b) Integral form of Gauss law c) Point form of Ampere law d) Integral form of Ampere law
Last Answer : a) Point form of Gauss law
Description : Which of the following Maxwell equations use curl operation? a) Maxwell 1st and 2nd equation b) Maxwell 3rd and 4th equation c) All the four equations d) None of the equations
Last Answer : a) Maxwell 1st and 2nd equation
Description : In free space, the condition that holds good is a) Minimum attenuation and propagation b) Minimum attenuation and maximum propagation c) Maximum attenuation and minimum propagation d) Maximum attenuation and propagation
Last Answer : b) Minimum attenuation and maximum propagation
Description : When a vector is irrotational, which condition holds good? a) Stoke’s theorem gives non-zero value b) Stoke’s theorem gives zero value c) Divergence theorem is invalid d) Divergence theorem is valid
Last Answer : b) Stoke’s theorem gives zero value
Description : In conductors, the E and H vary by a phase difference of a) 0 b) 30 c) 45 d) 60
Last Answer : c) 45
Description : It cannot be determined from Gauss law, whereas the remaining options can be computed from Gauss law. 10. Gauss law for magnetic fields is given by a) Div(E) = 0 b) Div(B) = 0 c) Div(H) = 0 d) Div(D) = 0
Last Answer : b) Div(B) = 0
Description : The power in a wave given that H component is 0.82 units in air. a) 126.74 b) 621.47 c) 216.47 d) 745.62
Last Answer : a) 126.74
Description : Which equation will be true, if the medium is considered to be air? a) Curl(H) = 0 b) Div(H) = 0 c) Grad(H) = 0 d) Div(H) = 1
Last Answer : b) Div(H) = 0
Description : The divergence of H will be a) 1 b) -1 c) ∞ d) 0
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 : The Poynting vector is the power component that is calculated by the a) Product of E and H b) Ratio of E and H c) Dot product of E and H d) Cross product of E and H
Last Answer : d) Cross product of E and H
Description : The work done in the power transmission with E and H given by 50 and 65 respectively. The velocity of propagation is 20m/s. a) 162.5 b) 621.5 c) 562.1 d) 261.5
Last Answer : a) 162.5
Description : Find the power of a wave given that the RMS value of E and H are 6 and 4.5 respectively. a) 24 b) 27 c) 29 d) 32
Last Answer : b) 27
Description : Find the power of an EM wave, given that the cross product of the E and H component is 2 + 3j. a) 2 b) 1 c) 4 d) 8
Last Answer : b) 1
Description : For dielectrics, which two components will be in phase? a) E and wave direction b) H and wave direction c) Wave direction and E x H d) E and H
Last Answer : d) E and H
Description : Which components exist in an electromagnetic wave? a) Only E b) Only H c) Both E and H d) Neither E or H
Last Answer : c) Both E and H
Description : The surface integral of which parameter is zero? a) E b) D c) B d) H
Last Answer : c) B
Description : The line integral of which parameter is zero for static fields? a) E b) H c) D d) B
Last Answer : a) E
Description : The sequence for finding H from E is a) E-B-H b) E-V-H c) E-D-H d) E-A-H
Last Answer : a) E-B-H
Description : Find the sequence to find B when E is given. a) E-D-H-B b) B-E-D c) H-B-E-D d) V-E-B
Last Answer : a) E-D-H-B
Description : The sequence for finding E when charge density is given is a) E-D-ρv b) E-B-ρv c) E-H-ρv d) E-V-ρv
Last Answer : a) E-D-ρv
Description : In dielectric medium, the Maxwell second equation becomes a) Curl(H) = Jd b) Curl(H) = Jc c) Curl(E) = Jd d) Curl(E) = Jd
Last Answer : a) Curl(H) = Jd
Description : The Maxwell second equation that is valid in any conductor is a) Curl(H) = Jc b) Curl(E) = Jc c) Curl(E) = Jd d) Curl(H) = Jd
Last Answer : a) Curl(H) = Jc
Description : To find D from B, sequence followed will be a) B-E-D b) B-H-D c) E-H-D d) E-B-D
Last Answer : a) B-E-D
Description : The correct sequence to find H, when D is given is a) D-E-B-H b) D-B-E-H c) It cannot be computed from the data given d) D-H
Last Answer : a) D-E-B-H
Description : Choose the best relation. a) A = -Div(V) b) V = Curl(A) c) H = -Grad(V) d) V = Div(E)
Last Answer : c) H = -Grad(V)
Description : Which of the following relation will hold good? a) D = μ H b) B = ε E c) E = ε D d) B = μ H
Last Answer : d) B = μ H
Description : Ampere law states that, a) Divergence of H is same as the flux b) Curl of D is same as the current c) Divergence of E is zero d) Curl of H is same as the current density
Last Answer : d) Curl of H is same as the current density
Description : The H quantity is analogous to which component in the following? a) B b) D c) E d) V
Last Answer : c) E
Description : Find the Maxwell equation derived from Faraday’s law. a) Div(H) = J b) Div(D) = I c) Curl(E) = -dB/dt d) Curl(B) = -dH/dt
Last Answer : c) Curl(E) = -dB/dt
Description : The divergence of which quantity will be zero? a) E b) D c) H d) B
Last Answer : d) B
Description : The normal component of which quantity is always discontinuous at the boundary? a) E b) D c) H d) B
Last Answer : b) D
Description : In electric fields, D= ε E. The correct expression which is analogous in magnetic fields will be a) H = μ B b) B = μ H c) A = μ B d) H = μ A
Last Answer : b) B = μ H
Description : The transmission coefficient of a wave with incident and transmitted electric field of 5 and 5 respectively is a) 0 b) 1 c) 10 d) 5
Description : Find the reflection coefficient of a wave with an incident electric field of 5 units and reflected electric field of 2 units. a) 2.5 b) 0.4 c) 0.8 d) 1.2
Last Answer : b) 0.4