71601. A transmission line of characteristic impedance z0 = 50 Ω. Phase Velocity = 2 x 108 m/sec, and length l = 1 m is terminated by a load z1 = (30 - j 40) ohms. The input impedance of the line for a frequency of 100 MHz will be
71602. A circular waveguide carries TE11 mode whose radial electric-field is given by Er = E 0J1 (r) sin φ V/m where 'r' is the radial distance in cm, from the waveguide axis. The cut-off wavelength of the mode is
71603. A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with εr = 4. The reflection coefficient for the normal incidence is
71604. A transmission line has characteristics impedance of (75 + j 0.01) Ω and is terminated in a load impedance of (70 + j 50) Ω. The transmission coefficient will be
71605. Maximum effective aperture of an antenna which is operating at a wavelength of 3 meters and has a directivity of 100
71606. The distance between maxima and minima of a standing wave is
71607. A TV. transmitting aerial is fixed on top of a 150 metre tower located on a mountain 1200 m height. The range of transmitter is
71608. A vertical wire of 1 meter length carries a current of 1 A at 10 MHz. The total radiated power is nearly
71609. The length of half-wave antenna is at 30 MHz
71610. For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the characteristic impedance will be
71611. Which one of the following statement is not a correct for a plane wave with = 0.5e-0.1x cos (106t - 2x)az A/m?
71612. Beamwidth (between first nulls) will be for an antenna at 3 MHz with directivity of 100
71613. If and the time average Poynting vector is
71614. Calculate the wave number in waveguide having dimensions 4 x 2 cm at 3 GHz
71615. The I/P impedance of a short circuited quarter wave long transmission line is
71616. A dipole antenna of λ/8 length has an equivalent total loss resistance of 1.5 Ω. The efficiency of the antenna is
71617. Gain of an antenna with a circular aperture of diameter 4 meter at frequency of 10 GHz, with directivity 60
71618. If the electric field intensity is given by , the potential difference between x(2, 0, 0) and y(1, 2, 3) is
71619. Polarization of a wave is
71620. Calculate the critical frequency for the E layer if maximum ionic densities are 3 x 106
71621. Calculate the directivity of a given linear end fire, uniform array of 20 element, each separated by λ/3
71622. For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the velocity propagation will be
71623. Antenna efficiency of antenna is, if radiation resistance is 370 Ω and loss resistance is 100 Ω
71624. At a particular time it is observed that the frequencies of F layer at Delhi is 3 MHz the maximum electron density is
71625. The effective length of an λ/2 antenna (Given Rr = 73 Ω and (Ae)max = 0.13 λ2 and η = 120 p is __________ .
71626. Calculate cut off frequency for dominant mode in rectangular waveguide if dimensions are a = 2, b = 1 cm.
71627. The input impedance for a half dipole if radii of both the antenna is 4 and 8 meter respectively
71628. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the guide wavelength for dominant mode.
71629. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the cut off frequency for dominant mode.
71630. Find the flux crossing the plane surface defined by 0.5 ≤ r ≤ 3.5 m and 0 ≤ z ≤ 3 m. if
71631. An isolated sphere in air has a radius equal to meter, its capacitance is
71632. Find cut off wavelength for mode TE11 in a circular waveguide having radius 2 cm. Assume K'a = 1.841
71633. The refractive index of E layer, if angle of incidence is 30°
71634. The sinusoidally time varying vector field is
71635. A transmission line having 50 Ω impedance is terminated in a load of (40 + j 30) Ω. The VSWR is
71636. Distilled water at 25°C is characterized by σ = 1.7 x 10-4 mho/m and ε = 78 ε0 at a frequency of 3 GHz. Its loss tangent is (ε = 10-9/36p F/m)
71637. The input impedance of short-circuited line of length l where l < λ/4
71638. If the height of transmitting and receiving antenna in a LOS system are 49 meter and a 9 meter respectively then the distance up to which communication may be possible is about
71639. In a line VSWR of a load is 6 dB. The reflection coefficient will be
71640. The refractive index of E layer at frequency of 81 N
71641. ∇ . = 0 is frequently known as
71642. A rhombic antenna is a
71643. Which of the following relations is valid?
71644. Diffraction of electromagnetic waves
71645. The magnetic field intensity vector of a plane wave is given by (x, y, z, t) = 10 sin (5000t + 0.004x + 30 ), where denotes unit vector in y direction the wave is propagating with a phase velocity.
71646. A line of characteristic impedance z0 ohms, phase velocity VP = 2 x 108 m/sec and length l = 2 m is terminated by a load impedance zL Ohms. The reflection coefficients at the input end and load end are respectively for a frequency of 50 MHz will be
71647. When a particular mode is excited in a waveguide, these appears an extra electric components in the direction of propagation. The resulting mode is
71648. An antenna has a gain of 44 dB. Assuming that the main beam of the antenna is circular in cross-section the beamwidth will be
71649. In cellphone communication base antennas are connected to other base antennas in
71650. The I/P impedance of a long short circuited section of a loss less transmission line is
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