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Electrical Engineering Objective Questions { Electromagnetism }

148. A circular loop has its radius increasing at a rate of 2 m/s. The loop is placed perpendicular to a constant magnetic field of 0.1 Wb/m2. When radius of the loop is 2 m, the emf induced in the loop will be
A. 0.8 icV
B. 0.4 TN
C. 0.2 ItV
D. zero
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149. Kirchhoff's current law for direct current is implicit in the expression
A. V. B = p
B.. rids= 0
C. V. B =0
D. V. H = - +
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150. Poisson's equation for an inhomogeneous medium is
A. cV2 V =-p
B. V.(c V V) = -p
C. V2(cV)= -p
D. V.(V c V) = -p
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151. The input impedance of a loss-less transmission line is 100 ohms when terminated in a short-circuit, and 64 ohms when terminated in an open circuit. The characteristic impedance of the line is
A. 80 ohms
B. 164 ohms
C. 36 ohms
D. 64 ohms
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152. Which one of the 'following sets of equations is independent in Maxwell's equations?
A. The two curl equations
B. The two divergence equations
C. Both the curl and divergence auditions
D. The two curl equations combined with the continuity equation.
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153. Two conducting shells of radii rt and r2 (ri r2), each with a charge 'Q' ar placed for apart in a uniform external electric field. The space surrounding each shell is filled with the same dielectric material.In this situation, the
A. shells will not experience any force
B. shells will experience identical forces
C. shell with radius r1 will experience a greater force
D. shell with radius r2 will experience a greater force
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154. Which of the following pairs of parameters and expressions is / are correctly matched? 1. Characteristic impedance ETH 2. Power flow density ....... V x1-1 3. Displacement current in non-conducting medium ....... E x1-1 Select the correct answer using the codes given below : Codes :
A. I alone
B. 2 and 3
C. 1 and 3
D. 1 and 2
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