62953. Assertion (A): In rectangular waveguide TE01 mode is just TE10 mode rotated by 90°.Reason (R): When a rectangular waveguide is rotated by 90°, the broad and narrow dimensions get interchanged.
62954. Consider the following statements about a magic tee The collinear arms are isolated from each other.On of the collinear arms is isolated from E arm.On of the collinear arms is isolated from H arm.E and H arms are isolated from each other. Of the above statements
62955. Assertion (A): Hollow waveguides are frequently used as transmission lines at microwave frequencies.Reason (R): Waveguide has high power handling capacity, low loss and simple structure.
62956. In p mode of operation of magnetron the spikes due to phase focussing effect rotate at an angular velocity corresponding to
62957. Dielectric constant and conductivity of rocky soil and flat sandy soil are around
62958. The main advantage of using micro waves for communications is
62959. A line of length less than and open circuited at far end behaves as
62960. The beam of a radar should be
62961. TE10 mode of propagation of electromagnetic energy in waveguides can be thought of as
62962. Ridge waveguide is essentially a form of capacitively loaded guide.
62963. The budget is presented to the Parliament?
62964. Which of the following modes cannot exist in rectangular resonant cavity?
62965. In a Gunn diode oscillator drift velocity of electron is 107 cm/s and active region length is 10 x 10-4 cm. The natural frequency of oscillation is
62966. Assertion (A): An artificial transmission line can be used as a pulse generator.Reason (R): A pulse function is used very frequently in network analysis.
62967. A waveguide twist is used to change the plane of polarization.
62968. Consider the following statements about directional coupler shown in the figure
Ports 1 and 2 are decouplePorts 3 and 4 are decoupledPots 1 and 3 are decoupledPorts 1 and 4 are decoupled Which of the above statements are correct?
62969. In a multicavity klystron amplifier the electron velocity of the order of
62970. At a frequency equal to cutoff frequency in a rectangular wave guide
62971. Two identical hybrid tees are joined as shown in the given figure. If 16 mW power is fed into port 1, the power output at ports 2 , 3, 1', 2', 3' respectively is
62972. In a microwave resistor the wall thickness is made as small as possible to
62973. In a klystron amplifier the transit time of electron passing the gap in the cavity should be
62974. In a cable with ∈r = 4, the wave velocity is
62975. In a backward wave oscillator the efficiency
62976. Consider the following statements Fading of signals is generally greatest near radio horizon.Fading of signals is generally greatest in shadow zone.Fading is small when a good optical path is present. Which of the above statements are correct?
62977. The use of coaxial microwave line should be restricted to frequencies
62978. Generally the wall thickness of rectangular waveguide is
62979. If QL is loaded Q, QE is external Q and QU is unloaded Q of a microwave resonator, then
62980. The velocity factor of a transmission line depends on
62981. A loss less line of characteristic impedance Z0 is terminated in pure reactance of -jZ0 value. VSWR is
62982. In a klystron amplifier the input cavity is called
62983. In a circular waveguide the dominant mode is
62984. The reflection coefficient on a line is 0.2 ∠45°. The SWR is
62985. The permissible pH value of potable water is:
62986. B O D in potable water may be:
62987. The rise of the carriage way at the outer edge is termed
62988. Bottommost layer of pavement is known as:
62989. Tyre pressure influences the:
62990. When a current source I is suddenly connected across a two terminal relaxed RC circuit at time t = 0, the voltage across the current source is shown in figure. The RC circuit is
62991. Buddhism and Jainism both gave stress on?
62992. and i(t) is a unit step, then V(t) in the steady state is given by
62993. For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is
62994. The terms RMS and average values apply only to sine waves.
62995. The drift velocity of electrons is
62996. Wave A = 100 sin ωt and wave B = 100 cos ωt. Then
62997. Z(c) for the network shown in the figure is The value of C and R are, respectively
62998. In an R-C series circuit excited by a voltage E, the charge across capacitor at t = 0+ is
62999. Two networks are cascaded through an ideal buffer. If td1 and td2 are delay times of network, the overall delay time is
63000. A series RC circuit has R = 5 Ω and C = 10 μF. The current in the circuit is 5 sin 20000t. The applied voltage is