76151. To estimate the water quantity which one of the following is most important?
76152. In a multicavity klystron amplifier the signal to be amplified develops an ac voltage of signal frequency across the gap in buncher cavity
76153. If VSWR is infinite, the transmission line is terminated in
76154. In a circular waveguide TE21 mode has lowest cutoff frequency
76155. The number of TV channels which can be accommodated in a spectrum of 300 MHz is about
76156. The noise figure of multicavity klystron amplifier is very low
76157. Assertion (A): The velocity of electromagnetic waves on overhead lines and coaxial cables is the same.Reason (R): Free space has an intrinsic impedance of 377 ohms.
76158. In the given figure the E and H lines in a coaxial cable
76159. Roughly the time required for microwave cooking as compared to conventional cooking is
76160. If the minimum range of a radar is to be doubled, the peak power has to be increased by a factor of
76161. Which mode has the lowest cut off frequency in circular wave guides?
76162. Assertion (A): Klystron amplifiers use one or more intermediate cavities in addition to buncher and catcher cavity.Reason (R): When one or more intermediate cavities are used the bandwidth can be increased.
76163. A wave Em cos (bx - ωt) is a backward wave.
76164. A reflex klystron oscillator is a
76165. Consider the following applications TV tuningActive filterMicrowave frequency multiplication In which of above can a varactor diode be used?
76166. Consider the following statements Dissipative attenuator has a fixed value of attenuation.Reflective attenuator has a fixed value of attenuation.Both dissipative and reflective attenuators are available only with fixed attenuation.Both dissipative and reflective attenuators are available with either fixed or variable attenuation. Which of the above are correct?
76167. The quantity of water requirement for domestic purpose is:
76168. Power gain of a multicavity klystron amplifier is
76169. If a short line is terminated in characteristic impedance it behaves as an infinite line.
76170. Ga As exhibits negative differential mobility
76171. Consider the following statements Bunching of electrons occurs in two cavity klystron amplifier.Bunching of electrons occurs in multi cavity klystron amplifier.Bunching of electrons occurs in reflex cavity klystron amplifier. Which of the above statements are correct?
76172. Assertion (A): For high frequency lines inductive reactance is very high as compared to ac resistance.Reason (R): Due to skin effect ac resistance of line is higher than dc resistance.
76173. Consider the following applications SwitchAttenuatorPhase shifterOscillator In which of the above can a PIN diode be used?
76174. Which one of the following is not a negative resistance device?
76175. Microwave links are typically 50 km apart
76176. For matching over a range of frequencies in a transmission line it is best to use
76177. Assertion (A): In the interaction region of magnetron an electron is subjected to three forces: force due to electric field, force due to magnetic field and centrifugal force.Reason (R): The mechanism of generation of microwaves, in a magnetron, involves interaction of electromagnetic fields with electrons moving in static electric and magnetic fields oriented at right angles to each other.
76178. Which of the following is wrong for a magic used to tee?
76179. The expression HZ = C cos(Bx) cos(Ay)yz is for
76180. Assertion (A): Impedance matching can be done by using stubs.Reason (R): A double stub is used for impedance matching when frequency of signal varies.
76181. Read the following statements about TWT It uses thermionic emission.It uses an attenuater.It is inherently a resonant device.It has broad bandwidth. Which of the above are correct?
76182. If a line having Z0 = 300 ∠ 0 W is short circuited at far end, VSWR is
76183. A klystron amplifier generally uses Pierce gun
76184. Assertion (A): PIN diode is used as a fast switch.Reason (R): PIN diode has very high resistance when reverse biased and very low resistance when forward biased.
76185. A pulsed radar produces 1 μ sec pulses at a rate of 1000 per second. The duty cycle is
76186. Assertion (A): Impedance measurement at microwave frequencies is done by finding SWR.Reason (R): SWR and reflection coefficient depend on the characteristic impedance and load impedance.
76187. When a line is loaded the characteristic impedance is equal to
76188. Which device has internal positive feedback?
76189. The domain mode in rectangular waveguide is
76190. The reverse voltage applied to a varactor diode
76191. To ensure that only dominant mode TE10 is allowed to propagate in an air filled rectangular waveguide, the lower frequency limit and upper frequency limit are
76192. The skin depth at 1000 MHz as compared to that at 500 MHz is
76193. The transit time (in cycles) for electrons in repeller space of reflex klystron oscillator for sustaining oscillations is (n is any integer)
76194. In a TWT the amplitude of resultant wave travelling down the helix remains constant
76195. In the given figure forward current wave has a magnitude of
76196. In an infinite line the input impedance at every point is equal to characteristic impedance.
76197. Consider the following time parameters Domain growth time constant.Transit time.Dielectric relaxation time in positive mobility regime. Which of the above are used in connection width transferred electron device?
76198. PIN diode has
76199. The two terms used to describe performance of a directional coupler are
76200. The number of PM radio channels which can be accommodated in a spectrum of 300 MHz is about
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