71651. Which of the following relations is correct?
71652. For frequencies upto 1650 kHz __________ antenna is used
71653. Due to which of the following reasons, the ground wave eventually disappears, as one moves away from the transmitter?
71654. A loop antenna may be of
71655. Velocity of the wave when it passes from air into sphere
71656. The ratio of the directivity of an end fire antenna to that of a broadside antenna is
71657. If the electric field intensity associated with a uniform plane electromagnetic wave travelling in a perfect dielectric medium is given by E(z, t) = 10 cos (2p x 107t - 0.1 p z) volt/metre, then the velocity of the travelling wave is
71658. The absorption of radio waves by atmosphere depends on
71659. For transmission-line matching over range of frequencies, it is best to use a
71660. Microwave signals transmitted towards the sky are
71661. Radiation intensity does not depend upon
71662. Δ2V = - r /E is known as __________ equation
71663. A vertical earthed antenna is resonant when its physical height is equal to
71664. Which of the following is a vector quantity?
71665. The L/C has the dimension of
71666. The value of VSWR is taken as ∞ when the line is
71667. The wavelength of an electromagnetic wave after reflection at angle on a surface
71668. A higher value of Standing Wave Ratio indicates
71669. An end fire array consisting of several half-wave lengths of directive gain 40, then Find width of major lobe for broadside
71670. A wavelength of 1 mm could be expected in
71671. The numerical value of directivity of current element of half-wave dipole is 1.76 and 2.15 dB respectively. The directive gain of half-wave dipole over current element will be
71672. The maximum effective aperture of an antenna which is operating at wavelength of 2 m and has directivity of 100 is
71673. The waveguides compared to equivalent transmission lines at low frequency are
71674. The current distribution of a half wave dipole is
71675. In case of static electric field Maxwell's divergence equation states that:
71676. For a reflection co-efficient of 0.5, the value of SWR is
71677. A rectangular waveguide having TE10 mode as dominant mode is having a cut off frequency of 18 GHz for the TE30 mode. The inner broad wall dimension of the rectangular waveguide is
71678. A 50 p characteristic impedance line is connected to a load which shows a reflection coefficients of 0.268. If Vin = 15 volt, then the net power delivered to the load will be
71679. 1 dB is equal to __________ nepier
71680. Cassergain feed is used with a parabolic reflector to
71681. Voltage standing wave pattern in a loss less transmission line with characteristic impedance 50 Ω and a resistive load is shown in the figure. The value of load resistance is
71682. For the same length of arrays, half power beam-width of binomial array
71683. The effective electrical length of an antenna is __________ its physical length
71684. The direction in a Yagi Uda antenna is longer than the radiating element.
71685. The intrinsic impedance of free space
71686. To couple a coaxial line to a parallel to wire line it is best to use a
71687. The shunt admittance of a transmission line is given by
71688. A dipole antenna was radiating with some excitation in free space radiating a certain amount of the power. If this antenna is immersed in a lake where water is non-dissipative but has a dielectric constant of 81, the radiated power with the same excitation will
71689. If short-circuited and open circuited impedances are 5 ohms and 20 ohms, then characteristic impedance is
71690. Electric lines of force do not cross each other because
71691. A person with a receiver is 5 km away from the transmitter. What is the distance that this person must move further to detect at 3 dB decrease in signal strength?
71692. For free space propagation
71693. SHF range is
71694. In figure the voltage distribution on a vertical earthed antenna is represented by
71695. The direction in a Yagi Uda antenna
71696. In cell phone antennas are
71697. Antenna commonly used for microwave links are
71698. For a good conducting medium the intrinsic impedance is
71699. For an ideal antenna, numerical value of directivity must be
71700. The force in a magnetic field is given by F = qvB
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