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You Are On Multi Choice Question Bank SET 1163

58151. The torque (in mm) acting on a circular current loop of radius 1 mm in the xy plane, connected at the origin and with current 0.1 A, flowing in the sense of increasing in a magnetic field is



58152. Which one of the following potential does not satisfy Laplace's equations?




58153. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.





58154. Calculate wave impedance for TE mode





58155. In a 100 turn coil, if the flux through each turn is (t3 - 2t)mWb, the magnitude of the induced emf in the coil at a time of 4 sec is





58156. A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is





58157. A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its Brewster angle is





58158. In a conductor which of the following relations hold good?





58159. The radiation resistance of a λ/16 wire dipole in free space will be nearly





58160. Find the noise factor for an antenna at 27°C with equivalent noise temperature 30°K





58161. The displacement flux density at a point on the surface of a perfect conductor is = 2(ax - 3 az)c/m2 pointing away from the surface. The charge density at that point c/m2 will be





58162. Characteristic impedance of a transmission line is 50 Ω. Input impedance of the open circuited line. Zoc = 100 + J150 Ω. When transmission line is short circuited, then value of the input impedance will be





58163. A material has conductivity of 10-2 mho/m and a relative permittivity of 4. The frequency at which conduction current in the medium is equal to displacement current is





58164. The example of non-pre emptive scheduling is





58165. An end fire array consisting of several half-wave lengths of directive gain 40, then find the width of major lobe





58166. A uniform plane EM wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What percentage of incident power that is reflected?





58167. Poynting vector is associated with which of the following?





58168. A broadside array consisting of 200 cm wavelength with 10 half-wave dipole spacing 10 cm. And if each array element feeding with 1 amp. current and operating at same frequency then find the radiated power





58169. For static magnetic field Maxwell's curl equation is given by





58170. If wave of critical frequency 30 MHz is departing at an angle of 60°, then the MUF is given to be





58171. An antenna having an effective temperature of 27°K is fed into a microwave amplifier that has an effective noise temperature of 30 K. Calculate the available noise power per unit bandwidth





58172. A 10 GHz signal propagates in a waveguide with a phase velocity of 4 x 108 m/s. If the signal produces standing wave in the guide, then the distance between successive minimal will be





58173. The incidence from dielectric medium 1 (ε1) into dielectric medium 2 (ε2), Brewster angle θB and the corresponding angle of transmission θt for will be respectively




58174. A medium of relative permittivity εr2 = 2 forms an interface with free space. A point source of EM energy is located in the medium at a depth of 1 meter from the interface. Due to the total internal reflection, the transmitted beam has a circular cross-section over the interface. The area of the beam cross section at the interface is given by





58175. A transmission line of characteristic impedance z0 = 50 Ω. Phase Velocity = 2 x 108 m/sec, and length l = 1 m is terminated by a load z1 = (30 - j 40) ohms. The input impedance of the line for a frequency of 100 MHz will be





58176. A circular waveguide carries TE11 mode whose radial electric-field is given by Er = E 0J1 (r) sin φ V/m where 'r' is the radial distance in cm, from the waveguide axis. The cut-off wavelength of the mode is





58177. A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with εr = 4. The reflection coefficient for the normal incidence is





58178. A transmission line has characteristics impedance of (75 + j 0.01) Ω and is terminated in a load impedance of (70 + j 50) Ω. The transmission coefficient will be





58179. Maximum effective aperture of an antenna which is operating at a wavelength of 3 meters and has a directivity of 100





58180. The distance between maxima and minima of a standing wave is





58181. A TV. transmitting aerial is fixed on top of a 150 metre tower located on a mountain 1200 m height. The range of transmitter is





58182. A vertical wire of 1 meter length carries a current of 1 A at 10 MHz. The total radiated power is nearly





58183. The length of half-wave antenna is at 30 MHz





58184. For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the characteristic impedance will be





58185. Which one of the following statement is not a correct for a plane wave with = 0.5e-0.1x cos (106t - 2x)az A/m?





58186. Beamwidth (between first nulls) will be for an antenna at 3 MHz with directivity of 100





58187. If and the time average Poynting vector is


58188. Calculate the wave number in waveguide having dimensions 4 x 2 cm at 3 GHz





58189. The I/P impedance of a short circuited quarter wave long transmission line is





58190. A dipole antenna of λ/8 length has an equivalent total loss resistance of 1.5 Ω. The efficiency of the antenna is





58191. Gain of an antenna with a circular aperture of diameter 4 meter at frequency of 10 GHz, with directivity 60





58192. If the electric field intensity is given by , the potential difference between x(2, 0, 0) and y(1, 2, 3) is





58193. Polarization of a wave is





58194. Calculate the critical frequency for the E layer if maximum ionic densities are 3 x 106





58195. Calculate the directivity of a given linear end fire, uniform array of 20 element, each separated by λ/3





58196. For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the velocity propagation will be





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