76201. Consider the following statements Gunn diode can be used in combinational logic circuits.Gunn diode can be used in sequential logic circuits.Both Gunn diode and GaAs Mesfet can be used in logic circuits. Which of the above statements are correct?
76202. In the given figure shows the equivalent circuit of a magic tee. If all ports are matched
76203. Assertion (A): Microstrip is very commonly used in microwave integrated circuits.Reason (R): Microstrip has an easy access to the top-surface so that active and passive discrete components can be easily mounted.
76204. A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is
76205. The word 'LORAN' means
76206. In the given figure forward voltage wave has a magnitude
76207. The duty cycle of a radar transmitter is equal to
76208. In a klystron amplifier the bunching effect
76209. Out of modes TE20 and TE30 of propagation of electromagnetic engery
76210. A TE10 rectangular waveguide is to be designed for operation over 25-35 GHz and the band centre is 1.5 times the cutoff frequency. The dimension of broadside is
76211. In a klystron amplifier the force on all electrons
76212. If load impedance ZL >> Z0, then
76213. The inductance of a twin feeder used to connect antenna to TV receiver is about
76214. When resonant cavities are coupled together the result is
76215. The path length between ports 1 and 2 for the two waves in a hybrid ring is
76216. The radiation resistance of a circular loop of one turn is 0.01 ohm. For 5 turn loop the radiation resistance is
76217. As wavelength decrease the size of high directivity antenna
76218. Which of the following modes of transmission will not be supported by a rectangular waveguide?
76219. In a circular waveguide with radius r, the dominant mode is
76220. A parametric amplifier uses
76221. Assertion (A): Impatt diode can be used in both amplifiers and oscillators.Reason (R): Impatt diode has a low resistance.
76222. Which one of the following can be used for amplification of microwave energy?
76223. At frequencies of 10 MHz and higher the impedance represented by ground is primarity
76224. A disadvantage of microstrip line as the connections of compared to strip line is that former
76225. As frequency increases, the transmission efficiency
76226. A circular polarizer converts a linearly polarized wave into a circularly polarised wave.
76227. If D is diameter of circular waveguide the cutoff wave-length for TE11 mode is equal to
76228. The external magnetic field in a magnetron is such that lines are
76229. Varactor diodes use
76230. A circular waveguide carries TE11 mode whole radial electric field is given byEr = E0j1(r) sin Φ V/mwhere r is radial distance in cm from the axisThe cut off wavelength is
76231. Assertion (A): Impatt diode is an avalanche diode.Reason (R): Avalanche breakdown phenomenon occurs when a p-n junction is reverse biased.
76232. A radar has a maximum range of 120 km. The maximum allowable pulse repetition frequency for unambiguous reception is
76233. In a line with finite attenuation
76234. In the given figure a short circuited transmission line resonator If n = 1, 2, 3...
76235. The electric field in a TWT due to applied signal
76236. In 8 cavity magnetron the p mode corresponds to a total phase shift equal to
76237. Satellite communication systems use the frequency band
76238. The characteristic impedance of a cable is about
76239. The Q factor of a waveguide resonator is given by (ω0 is resonant frequency, U is energy storage and WL is the power loss)
76240. A TR (transmitter receiver) tube has
76241. When duct propagation exists
76242. If in line the characteristic impedance becomes real.
76243. In a microwave coaxial cable the inner conductor radius is a and inner radius of outside conductor is b. For TE11 mode the cut off wavelength is about
76244. In a magnetron the magnetic flux density is of the order of
76245. For a directional coupler the power is in the ratio of
76246. As regards rectangular and circular waveguides
76247. In a high frequency coaxial line and the length of line characteristic impedance is a function of
76248. Assertion (A): In TE10 mode the cutoff frequency of rectangular waveguide is where a is the broad dimension and c is velocity of light.Reason (R): TE10 mode is the dominant mode in rectangular waveguide.
76249. The usable bandwidth of ridge wave guide
76250. Assertion (A): In TE mode for rectangular waveguide.Reason (R): In TM mode for rectangular waveguide.
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