76403. Consider the following statements about hybrid ring Ports 1 and 2 are decoupled.Port 3 and 4 are coupled.A signal entering either port 1 or 2 splits equally between ports 3 and 4.A signal entering either port 3 or 4 splits equally between ports 1 and 2. Which of the above are correct?
76404. TM01 mode in circular waveguide is analogous to
76405. In microwave system, waveguide twists
76406. A 'rat race' is a
76407. A directional coupler is used
76408. 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.
76409. 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
76410. 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.
76411. In p mode of operation of magnetron the spikes due to phase focussing effect rotate at an angular velocity corresponding to
76412. Dielectric constant and conductivity of rocky soil and flat sandy soil are around
76413. The main advantage of using micro waves for communications is
76414. A line of length less than and open circuited at far end behaves as
76415. The beam of a radar should be
76416. TE10 mode of propagation of electromagnetic energy in waveguides can be thought of as
76417. Ridge waveguide is essentially a form of capacitively loaded guide.
76418. Which of the following modes cannot exist in rectangular resonant cavity?
76419. 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
76420. 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.
76421. A waveguide twist is used to change the plane of polarization.
76422. 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?
76423. In a multicavity klystron amplifier the electron velocity of the order of
76424. At a frequency equal to cutoff frequency in a rectangular wave guide
76425. 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
76426. In a microwave resistor the wall thickness is made as small as possible to
76427. In a klystron amplifier the transit time of electron passing the gap in the cavity should be
76428. In a cable with ∈r = 4, the wave velocity is
76429. In a backward wave oscillator the efficiency
76430. 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?
76431. The use of coaxial microwave line should be restricted to frequencies
76432. Generally the wall thickness of rectangular waveguide is
76433. If QL is loaded Q, QE is external Q and QU is unloaded Q of a microwave resonator, then
76434. The velocity factor of a transmission line depends on
76435. A loss less line of characteristic impedance Z0 is terminated in pure reactance of -jZ0 value. VSWR is
76436. In a klystron amplifier the input cavity is called
76437. In a circular waveguide the dominant mode is
76438. The reflection coefficient on a line is 0.2 ∠45°. The SWR is
76439. The permissible pH value of potable water is:
76440. B O D in potable water may be:
76441. The rise of the carriage way at the outer edge is termed
76442. Bottommost layer of pavement is known as:
76443. Tyre pressure influences the:
76444. 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
76445. and i(t) is a unit step, then V(t) in the steady state is given by
76446. For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is
76447. The terms RMS and average values apply only to sine waves.
76448. The drift velocity of electrons is
76449. Wave A = 100 sin ωt and wave B = 100 cos ωt. Then
76450. Z(c) for the network shown in the figure is The value of C and R are, respectively
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