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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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