Electromagnetic Field Theory The main disadvantage of the two-hole directional coupler is Poor directivity Low directional coupling High standing wave ratio Narrow bandwidth Poor directivity Low directional coupling High standing wave ratio Narrow bandwidth ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory Two coupled coils with L1 = L2 = 0.6 H have a coupling coefficient of K = 0.8. The turns ratio N1/N2 is 1. 0.5. 2. 4. 1. 0.5. 2. 4. ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as Loss coefficient Front to back ratio Transmission efficiency None of these Loss coefficient Front to back ratio Transmission efficiency None of these ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0. No Yes No Yes ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory A rectangular loop in the x – z plane bounded by the lines x = 0, x = a, z = 0 and z = b is in a time varying magnetic field is given by B = B0 cosωt + ay. Where B0 is constant, ω is angular frequency and ay unit vector in the y direction. Now the emf induced in the loop is given by Zero. Bo ω sinω t. abω Bo sinω t. ab Bo cosω t. Zero. Bo ω sinω t. abω Bo sinω t. ab Bo cosω t. ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic Field Theory Magnetic field intensity at centre of circular coil, of diameter 1 m and carrying a current of 2 A is 1 A/m. 4 A/m. 2 A/m. 8 A/m. 1 A/m. 4 A/m. 2 A/m. 8 A/m. ANSWER DOWNLOAD EXAMIANS APP
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