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You Are On Multi Choice Question Bank SET 1254

62701. Power gain of a multicavity klystron amplifier is





62702. If a short line is terminated in characteristic impedance it behaves as an infinite line.



62703. Ga As exhibits negative differential mobility



62704. Consider the following statements Bunching of electrons occurs in two cavity klystron amplifier.Bunching of electrons occurs in multi cavity klystron amplifier.Bunching of electrons occurs in reflex cavity klystron amplifier. Which of the above statements are correct?





62705. Assertion (A): For high frequency lines inductive reactance is very high as compared to ac resistance.Reason (R): Due to skin effect ac resistance of line is higher than dc resistance.





62706. Consider the following applications SwitchAttenuatorPhase shifterOscillator In which of the above can a PIN diode be used?





62707. Which one of the following is not a negative resistance device?





62708. Microwave links are typically 50 km apart




62709. For matching over a range of frequencies in a transmission line it is best to use





62710. Assertion (A): In the interaction region of magnetron an electron is subjected to three forces: force due to electric field, force due to magnetic field and centrifugal force.Reason (R): The mechanism of generation of microwaves, in a magnetron, involves interaction of electromagnetic fields with electrons moving in static electric and magnetic fields oriented at right angles to each other.





62711. Which of the following is wrong for a magic used to tee?





62712. The expression HZ = C cos(Bx) cos(Ay)yz is for





62713. Assertion (A): Impedance matching can be done by using stubs.Reason (R): A double stub is used for impedance matching when frequency of signal varies.





62714. Read the following statements about TWT It uses thermionic emission.It uses an attenuater.It is inherently a resonant device.It has broad bandwidth. Which of the above are correct?





62715. If a line having Z0 = 300 ∠ 0 W is short circuited at far end, VSWR is





62716. A klystron amplifier generally uses Pierce gun



62717. Assertion (A): PIN diode is used as a fast switch.Reason (R): PIN diode has very high resistance when reverse biased and very low resistance when forward biased.





62718. A pulsed radar produces 1 μ sec pulses at a rate of 1000 per second. The duty cycle is





62719. Assertion (A): Impedance measurement at microwave frequencies is done by finding SWR.Reason (R): SWR and reflection coefficient depend on the characteristic impedance and load impedance.





62720. When a line is loaded the characteristic impedance is equal to



62721. Which device has internal positive feedback?





62722. The domain mode in rectangular waveguide is





62723. The reverse voltage applied to a varactor diode





62724. To ensure that only dominant mode TE10 is allowed to propagate in an air filled rectangular waveguide, the lower frequency limit and upper frequency limit are





62725. The skin depth at 1000 MHz as compared to that at 500 MHz is





62726. The transit time (in cycles) for electrons in repeller space of reflex klystron oscillator for sustaining oscillations is (n is any integer)



62727. In a TWT the amplitude of resultant wave travelling down the helix remains constant



62728. In the given figure forward current wave has a magnitude of





62729. In an infinite line the input impedance at every point is equal to characteristic impedance.



62730. Consider the following time parameters Domain growth time constant.Transit time.Dielectric relaxation time in positive mobility regime. Which of the above are used in connection width transferred electron device?





62731. PIN diode has





62732. The two terms used to describe performance of a directional coupler are





62733. The number of PM radio channels which can be accommodated in a spectrum of 300 MHz is about





62734. Consider the following statements Gunn diode can be used in combinational logic circuits.Gunn diode can be used in sequential logic circuits.Both Gunn diode and GaAs Mesfet can be used in logic circuits. Which of the above statements are correct?





62735. In the given figure shows the equivalent circuit of a magic tee. If all ports are matched





62736. Assertion (A): Microstrip is very commonly used in microwave integrated circuits.Reason (R): Microstrip has an easy access to the top-surface so that active and passive discrete components can be easily mounted.





62737. A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is





62738. The word 'LORAN' means





62739. In the given figure forward voltage wave has a magnitude





62740. The duty cycle of a radar transmitter is equal to





62741. In a klystron amplifier the bunching effect





62742. Out of modes TE20 and TE30 of propagation of electromagnetic engery





62743. A TE10 rectangular waveguide is to be designed for operation over 25-35 GHz and the band centre is 1.5 times the cutoff frequency. The dimension of broadside is





62744. In a klystron amplifier the force on all electrons





62745. If load impedance ZL >> Z0, then





62746. The inductance of a twin feeder used to connect antenna to TV receiver is about





62747. When resonant cavities are coupled together the result is





62748. The path length between ports 1 and 2 for the two waves in a hybrid ring is


62749. The radiation resistance of a circular loop of one turn is 0.01 ohm. For 5 turn loop the radiation resistance is





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