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You Are On Multi Choice Question Bank SET 1257

62851. Assertion (A): A line of length slightly more than and open circuited at far end is equivalent to an inductive reactance.Reason (R): A line of length slightly more than and short circuited at far end behaves as a capacitive reactance.





62852. TE01 mode of propagation of electromagnetic energy





62853. Assertion (A): Slotted line is frequently used for microwave measurements.Reason (R): The unknown impedance is mounted at the end of slotted line.





62854. Fibers have numerical aperture (NA) in the range of 0.15 to 0.4 Fibers with higher NA value would have





62855. The following components are used to measure power output of a 2 kW TWT amplifier TWTLow pass/High pass filterLow power 20 dB attenuator40 dB directional coupler with matched loadPower meter. The correct sequence of connections of these components is:





62856. Which part of radio spectrum is more crowded?





62857. As compared to their values in free space





62858. Lakshadweep Islands are?





62859. Characteristic impedance of a coaxial cable is inversely proportional to ∈r .



62860. A rectangular waveguide has a discontinuity in the form of reduced narrow dimension. In the equivalent circuit this discontinuity can be represented by





62861. Depth of penetration does not depend on frequency.



62862. Assertion (A): Inter-digitated geometry is widely used for microwave transistors.Reason (R): Tuning at input and output of transistor uses MOS chip capacitors.





62863. For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about





62864. Hollow waveguides are used as transmission lines at frequencies





62865. Two men and a woman were killed in a ......... between a car and a jeep.?





62866. The first computerised Panchayath in Kerala?





62867. The total power radiated from an antenna system is determined by imagining that the antenna is at the centre of a very large





62868. The AM, PM, and TV broadcast frequencies are





62869. Assertion (A): For a reciprocal microwave junction the S matrix is symmetrical.Reason (R): In a symmetrical matrix Sij = Sji.





62870. In TE mode of waveguide Ez = 0



62871. The primary constants of a transmission line are





62872. Who among the following is most benefited from inflation?





62873. The p mode of operation of magnetron signifies that





62874. Consider the following statements (L is the length of array between centres of end antennas and A is wave-length)Width of major lobe between nulls of broad side array and end fire array are different.Directive gain of broadside array and end fire array are different.Directive gain of broadside array is 4 Which of the above statements are correct?





62875. The electrical requirement on wall thickness of rectangular wave guide is





62876. If a microstrip is enclosed in a metal enclosure





62877. In the given figure power meters at A and B indicate 1 mW and 110 μW respectively. VSWR of line is





62878. As frequency is increased, the skin effect





62879. In a rectangular waveguide there is one half wave variation of electric field across the narrow dimension and two half wave variations of electric field across wider dimension. The dominant mode is





62880. VTM stands for voltage tunable magnetron.



62881. Which of the following is used in integrated circuits?





62882. Which of the following is a balanced line?





62883. A line of characteristic impedance 400 Ω is terminated by a resistance of 400 Ω. The reflected quantities are





62884. A magic tee is to be used as CW duplexer. Then port 1, port 2, port 3 (E arm), port 4 (H arm) respectively should be connected to





62885. Wave guides are pressurised above normal atmospheric pressure for





62886. Assertion (A): In a power divider SH = 0, S21 = 0.707 = S3, Reason (R): In a power divider the input port (i.e., port 1) is matched and incident power is equally divided in output ports 2 and 3





62887. In microwave detector used in laboratory measurements of relative power levels, standing wave ratio is about





62888. Microwaves





62889. In microstrip line has dielectric material most commonly used is





62890. In fibre optics the use is made of thin glass fibres for efficient transmission of light.



62891. Fields are said to be circularly polarized if





62892. Which mode is called dominant mode in rectangular wave guide?





62893. In a TWT the loss in attenuator is





62894. To study electromagnetic radiations from astronomical objects, radio astronomers use





62895. Radar reciever has high sensitivity and low noise figure



62896. For a waveguide, which of the following statements is wrong?





62897. A transmission line discontinuity is defined as any interruption in the uniformity of the line.



62898. Interference generated by electrical equipment and automobile ignition systems when observed closed to earth is





62899. The earliest uses of electromagnetic waves were





62900. At millimeter wavelength the favoured mode in circular wave guide is





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