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You Are On Multi Choice Question Bank SET 1255

62751. As wavelength decrease the size of high directivity antenna





62752. Which of the following modes of transmission will not be supported by a rectangular waveguide?





62753. In a circular waveguide with radius r, the dominant mode is





62754. Who is the journalist associated with “Kesari”?





62755. A parametric amplifier uses





62756. Assertion (A): Impatt diode can be used in both amplifiers and oscillators.Reason (R): Impatt diode has a low resistance.





62757. Which one of the following can be used for amplification of microwave energy?





62758. Who among the following has been elected in the International Tennis Hall of Fame?





62759. At frequencies of 10 MHz and higher the impedance represented by ground is primarity





62760. A disadvantage of microstrip line as the connections of compared to strip line is that former





62761. As frequency increases, the transmission efficiency





62762. A circular polarizer converts a linearly polarized wave into a circularly polarised wave.



62763. If D is diameter of circular waveguide the cutoff wave-length for TE11 mode is equal to





62764. The external magnetic field in a magnetron is such that lines are





62765. Varactor diodes use





62766. A circular waveguide carries TE11 mode whole radial electric field is given by Er = E0j1(r) sin Φ V/m where r is radial distance in cm from the axis The cut off wavelength is





62767. Assertion (A): Impatt diode is an avalanche diode.Reason (R): Avalanche breakdown phenomenon occurs when a p-n junction is reverse biased.





62768. A radar has a maximum range of 120 km. The maximum allowable pulse repetition frequency for unambiguous reception is





62769. In a line with finite attenuation





62770. In the given figure a short circuited transmission line resonator If n = 1, 2, 3...





62771. The electric field in a TWT due to applied signal





62772. In 8 cavity magnetron the p mode corresponds to a total phase shift equal to





62773. Satellite communication systems use the frequency band





62774. The characteristic impedance of a cable is about





62775. The Q factor of a waveguide resonator is given by (ω0 is resonant frequency, U is energy storage and WL is the power loss)


62776. A TR (transmitter receiver) tube has





62777. When duct propagation exists





62778. The substance that contains the maximum amount of nitrogen is?





62779. Of my three daughters she is ..........?





62780. If in line the characteristic impedance becomes real.



62781. 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





62782. In a magnetron the magnetic flux density is of the order of





62783. For a directional coupler the power is in the ratio of





62784. As regards rectangular and circular waveguides





62785. In a high frequency coaxial line and the length of line characteristic impedance is a function of





62786. 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.





62787. The usable bandwidth of ridge wave guide





62788. Assertion (A): In TE mode for rectangular waveguide.Reason (R): In TM mode for rectangular waveguide.





62789. The attenuation characteristics of a loaded line is similar to that of





62790. A microstrip line has ∈r = 9. The normalised wavelength is about





62791. If the repeller voltage in a klystron oscillator is increased the transit time of electron





62792. In which of the following devices can the operation be visualised in terms of a series feedback loops?





62793. The first and second subscripts in models of circular waveguides depict





62794. In which mode of circular waveguide does the attenuation continuously decrease as frequency is increased?





62795. In which mode of rectangular waveguide are all field components zero?





62796. A microstrip line has dielectric having relative permittivity ∈r. The effective dielectric constant is





62797. The rotation of direction of E field of a linearly polarized wave passing through a magnetised ferric medium is called




62798. If air pressure in a rectangular waveguide is increased the maximum power handling capacity





62799. A directional coupler is used to determine





62800. A square waveguide carries TE11 mode whose axial magnetic field is given by Hz = H0 , where the guide dimensions are in cms. The cut off frequency of the mode is





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