IES-2010 IES Academy ET (Paper-I) Electronics Engineering (Paper-I)

India’s No 1IES AcademyIES-2010ET (Paper-I)Q84. The arrangement for calibrating a phase shifter is shown in the followingdiagram:The calibrated short is adjusted while phase shift is introduced by thephase shifter under test to maintain a null at the probe fixed in location. Inone such measurement, the displacement of the short is 5 mm while theguide wavelength in it is 5 cm. At this setting of the phase shifter, the valueof the phase shift (in degrees) will be(a) 90 (b) 72 (c) 45 (d) 36Q85. For time-varying electromagnetic fields with electric and magnetic fieldgiven by E and H respectively, the rate of energy flow per unit area has amagnitude given by( a) E H cos θ ( b) E H sin θ ( c) ( E + H) sin θ ( d) ( E − H)cos θ85.Q86. Consider the components of E and H listed below:1. Ex 2. Ey 3. Ez 4. Hy 5.HzFor a plane wave traveling in x-direction and linearly polarized in y-direction(a) 1, 2 and 5 exist(b) 1, 3 and 4 exist(c) 3 and 4 exist(d) 2 and 5 exist8Q87. The expression for B , given that in free space ( )www.iesacademy.com Email: iesacademy@yahoo.com Page-15__is−8 8( a) 5× 10 cos ( 6π× 10 t −2πz)iy8 8( b) −90π× 10 sin ( 6π× 10 t−2πz)ix8 8( c) − 45× 10 sin ( 6π× 10 t−2πz)iy−8 8( ) × ⎡ ( π× − π ) − ( π×8− π )d 5 10 cos 6 10 t 2 z i sin 6 10 t 2 z iz⎤⎣⎦E = 15cos 6π× 10 t−2π z ix V/mQ88. A wave is propagated in a parallel-plane wave-guide. The frequency is 6GHz and plane separation is 3 cm. For the dominant mode match List I withList II and select the correct answer using the codes given below the lists:List IList II(Quantities)(Numerical values)A. Cut-off wavelength (cm) 1. 5B. Wavelength in wave guide (cm) 2. 6C. Phase velocity (megametre/sec) 3. 9.0525, 1 st Floor, Jia Sarai, Near IIT. New Delhi-16 Ph: 011-26537570, 9810958290