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

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India’s No 1IES AcademyIES-2010D. Group velocity (megametre/sec) 4. 166Codes 5. 543A B C D A B C D(a) 1 2 5 4 (b) 2 1 4 3(c) 2 1 5 4 (d) 5 4 2 3ET (Paper-I)Q89. A transmission line of 50 Ω characteristic impedance is terminated with a100 Ω resistance. The minimum impedance measured on the line is equal to(a) 0 Ω (b) 25 Ω (c) 50 Ω (d) 100 ΩQ90. A parabolic dish antenna has a conical beam 2° wide. The directivity of theantenna is approximately(a) 20 dB (b) 30 dB (c) 40 dB (d) 50 dBQ91. The skin depth at 10 MHz for a conductor is 1 cm. The phase velocity of anelectromagnetic wave in the conductor at 1000 MHz is abouta 6× 10 6 m/s b 6× 10 7 m/s c 3× 10 8 m/s d 6×10 8 m/s( ) ( ) ( ) ( )Q92. The intrinsic impedance of copper at high frequencies is(a) Purely resistive(b) Purely inductive(c) Complex with a capacitive component(d) Complex with an inductive componentQ93. All transmission line sections in Figure have a characteristic impedance R0+ j0. The input impedance Zin equals2 3a R b R c R d 2R3 2( ) ( ) ( ) ( )0 0 0 0Q94.The time averaged Poynting vector, in W/m 2 j( ωt+ βz), for a wave with E = 24e ayV/m in free space isz z ( c) 4.8 z ( d)−4.8zπ π π π( ) a − a ( b) 2.4 aaaQ95. The wavelength of a wave with propagation constant (0.1 π + j 0.2 π) m -1 is( a) 2m0.05( b10m ) ( c) 20m ( d)30mwww.iesacademy.com Email: iesacademy@yahoo.com Page-16__25, 1 st Floor, Jia Sarai, Near IIT. New Delhi-16 Ph: 011-26537570, 9810958290
India’s No 1IES AcademyIES-2010ET (Paper-I)Q96. The depth of penetration of a wave in a lossy dielectric increases withincreasing(a) Conductivity(b) Permeability(c) Wavelength(d) Permittivityj t zQ97. The polarisation of a wave with electric field vector E E e ω − β= a x + awww.iesacademy.com Email: iesacademy@yahoo.com Page-17__(a) Linear(c) Left hand circular(b) Elliptical(d) Right hand circular( )( y)Q98. The radiation resistance of a circular loop of one turn is 0.01 Ω. Theradiation resistance of five turns of such a loop will be(a) 0.002 Ω (b) 0.01 Ω (c) 0.05 Ω (d) 0.25 ΩQ99. An antenna in free space receives 2 μW of power when the incident electricfield is 20 mV/m rms. The effective aperture of the antenna is(a) 0.005 m 2 (b) 0.05 m 2 (c) 1.885 m 2 (d) 3.77 m 2Q100. The maximum usable frequency of an ionospheric layer at 60° incidenceand with 8 MHz critical frequency is(a) 16 MHz(b) 16 MHz3(c) 8 MHz25, 1 st Floor, Jia Sarai, Near IIT. New Delhi-16 Ph: 011-26537570, 98109582900(d) about 6.93 MHzQ101. Bond strength of secondary bonds is in the range of(a) 1 kJ/mol (b) 10 kJ/mol (c) 100 kJ/mol (d) 1000 kJ/molQ102. Electron sea exists in(a) Polar bonds (b) Ionic bond (c) Covalent bond (d) Metallic bondQ103. Coordination number for closest packed crystal structure(a) 16 (b) 12 (c) 8 (d) 4Q104. Pick the thermo-plast from the following(a) Vinyls (b) Epoxies (c) Resins (d) Vulcanized rubberQ105. Schottky-defect in ceramic material is(a) Interstitial impurity(b) Vacancy- interstitial pair of cations(c) Pair of nearby cation and anion vacancies (d) Substitutional impurityQ106. Basic source of magnetism ______________.(a) Charged particles alone(b) Movement of charged particles(c) Magnetic dipoles(d) Magnetic domainsQ107. Match list-1 with list-2:List-1List-21. Dia-magnetic (A) superconductors2. Para-magnetic (B) alkali metals3. Ferro-magnetic (C) transition metalsis
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