76052. As the frequency is increased, the charging MVAR in a cable
76053. Loss angle of a good quality cable is about
76054. In a three cavity klystron amplifier, the oscillations are excited in
76055. In the given figure reflection coefficient at load is
76056. Which of the following lines is non-radiating?
76057. Assertion (A): The impedance of a matched load is equal to characteristic impedance of line.Reason (R): A matched termination absorbs all the power incident on it.
76058. Skin effect is more pronounced at high frequencies.
76059. Assertion (A): The phenomenon of differential mobility is called transferred electron effect.Reason (R): GaAs exhibits transferred electron effect.
76060. Which of the following devices uses a helix?
76061. Which of the following parameters is negligible in transmission lines?
76062. The width of a radio beam from a 1 m diameter parabolic antenna at 10 GHz is about
76063. The diagram to show distance time history of electrons in klystron amplifier is called
76064. Impedance level of Impatt diodes is generally lower than that of Gunn diodes
76065. A quarter wave line open circuited at far end behaves as
76066. A line has Z0 = 300 ∠ 0° Ω. If ZL = 150 ∠ 0° Ω, reflection coefficient is
76067. Assertion (A): A backward wave oscillator has an internal positive feedback.Reason (R): A positive feedback is necessary for sustained oscillations.
76068. In a microstrip transmission the signal can be easily redirected by changing the centre strip.
76069. The frequency of oscillation in a backward wave oscillator can be changed by
76070. A line has a phase constant of 29.8 rad/m. At 1000 MHz the wavelength is
76071. In the given figure the time taken by the wave to make one round trip is
76072. For a 50 Ω resistor for 3 GHz application, the stray capacitance should be less than
76073. In a travelling wave tube distributed interaction between an electron beam and a travelling wave takes place
76074. The fabrication of microstrip line is done by
76075. The condition of minimum distortion in a transmission line is
76076. The action of backward wave oscillator is similar to that of
76077. In the given figure the reflection coefficient at source end is
76078. Assertion (A): Artificial transmission lines are frequently used in laboratories.Reason (R): An artificial transmission line can be used to represent an actual line and can also be used as a delay circuit, as attenuator, as filter network etc.
76079. In a backward wave oscillator the wave travelling along the line winds itself back and forth
76080. A line is excited by a 100 V dc source. If reflection coefficients at both ends are 1 each then
76081. Assertion (A): A coaxial line is a non-radiating line.Reason (R): In a coaxial line the electric and magnetic fields are confined to the region between the concentric conductors.
76082. Reflex klystron oscillator is essentially a low power device
76083. A 10 km long line has a characteristic impedance of 400 ohms. If line length is 100 km, the characteristic impedance is
76084. A matched generator (Zg = Z0) with 1 Ω available. If all ports are matched, the power delivered at ports 1, 2, 3 respectively are
76085. Which TM mode in rectangular waveguide has lowest cutoff frequency?
76086. A resistive microwave load with ZL = 150 Ω is connected to 50 Ω coaxial line. SWR is
76087. Which of the following devices uses a slow wave structure?
76088. In a turnstile antenna two-half wave resonant wire radiators are placed at 90° to each other in the same plane and are excited
76089. A waveguide section in a microwave circuit acts as
76090. In a klystron amplifier dc electron velocity is v0 and dc electron charge density is r 0 the dc beam current is
76091. The directivity in a receiving antenna increases the intercept area in forward directionreduces the noise picked up from other sourcesprovides a means of discriminating against undesired signals originating in directions other than in which the desired transmitter lies. Which of the above statements are correct?
76092. Assertion (A): PIN diode can be used as attenuator and limiter.Reason (R): PIN diode has a thin intrinsic layer.
76093. The bunching action which occurs in multicavity klystron amplifier can be represented by Applegate diagram
76094. The cut off wavelength in circular waveguide
76095. In Reflex Klystron oscillator the focussing electrode is at a high potential
76096. Consider the following statements Impedance of Gunn diode is about tens of ohms.Impedance of Impatt diode is a few ohms.Impedance of Impatt diode are of the same order.Impedance of Impatt diode is more than that of Gunn diode. Which of the above statement are correct?
76097. In high frequency circuits impedance matching can be done by open circuited stubsshort circuited stubstransformer Which of the above correct?
76098. The directive gain of a transmitting antenna is proportional to
76099. In a loss line RL < Z0, then
76100. Assertion (A): A backward wave oscillator can be used as a sweep generator.Reason (R): The frequency of oscillation of a backward wave oscillator can be changed by varying the voltage which controls the beam velocity.
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