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Home⇒ Engineering⇒
Microwave communication
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Which of the following lines is non-radiating? Coaxial [other wrong options] [Discuss in forum] Open two wire Both None of the above |
Q22 ⇒ To ensure that only dominant TE10 mode propagates in a rectangular waveguide, the operating frequency must be more than cutoff frequency of TE10 mode and less than cutoff frequency of TE20 mode [other wrong options] [Discuss in forum] must be more than cutoff frequency of TE10 mode must be less than cutoff frequency of TE20 mode must be less than cutoff frequency of TE10 mode |
Q23 ⇒ Both Impatt and Trapatt devices use avalanche effect TRUE [other wrong options] [Discuss in forum] FALSE |
Q24 ⇒ If a microstrip is enclosed in a metal enclosure the radiation losses are reduced RL [other wrong options] [Discuss in forum] the radiation losses are increased the capacitance becomes zero the inductance becomes zero |
Q25 ⇒ A quarter wave line open circuited at far end behaves as L and C in series [other wrong options] [Discuss in forum] inductance L and C in parallel capacitance |
Q26 ⇒ As compared to their values in free space both velocity and wave length of electric wave in dielectric are smaller [other wrong options] [Discuss in forum] velocity of electric wave in dielectric is smaller but wave length of electric wave is more both velocity and wave length of electric wave in dielectric are higher wave length of electric wave is less but velocity is more in dielectric |
Q27 ⇒ Assertion (A): The phenomenon of differential mobility is called transferred electron effect. Reason (R): GaAs exhibits transferred electron effect. Both A and R are correct but R is not correct explanation of A [other wrong options] [Discuss in forum] Both A and R are correct and R is correct explanation of A A is correct but R is wrong A is wrong but R is correct |
Q28 ⇒ Which of the following is used in integrated circuits? Microstrip line [other wrong options] [Discuss in forum] Coaxial line Twin wire line Shield cable |
Q29 ⇒ The fabrication of microstrip line is done by printed circuit technique [other wrong options] [Discuss in forum] photo etching oxidation cladding |
Q30 ⇒ Assertion (A): For a reciprocal microwave junction the S matrix is symmetrical. Reason (R): In a symmetrical matrix Sij = Sji. Both A and R are correct but R is not correct explanation of A [other wrong options] [Discuss in forum] Both A and R are correct and R is correct explanation of A A is correct but R is wrong A is wrong but R is correct |
Q31 ⇒ In a microstrip transmission the signal can be easily redirected by changing the centre strip. TRUE [other wrong options] [Discuss in forum] FALSE |
Q32 ⇒ In fibre optics the use is made of thin glass fibres for efficient transmission of light. TRUE [other wrong options] [Discuss in forum] FALSE |
Q33 ⇒ A matched generator (Zg = Z0) with 1 Ω available. If all ports are matched, the power delivered at ports 1, 2, 3 respectively are 0.5 W, 0.5 W, 0 W [other wrong options] [Discuss in forum] 0 W, 0 W, 1 W 0.33 W each 0 W, 0.25 W, 0.25 W |
Q34 ⇒ VTM stands for voltage tunable magnetron. TRUE [other wrong options] [Discuss in forum] FALSE |
Q35 ⇒ 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. Both A and R are correct and R is correct explanation of A [other wrong options] [Discuss in forum] Both A and R are correct but R is not correct explanation of A A is correct but R is wrong A is wrong but R is correct |
Q36 ⇒ The earliest uses of electromagnetic waves were both (a) and (b) [other wrong options] [Discuss in forum] point to point communication radar neither (a) nor (b) |
Q37 ⇒ The bunching action which occurs in multicavity klystron amplifier can be represented by Applegate diagram TRUE [other wrong options] [Discuss in forum] FALSE |
Q38 ⇒ Wave guides are pressurised above normal atmospheric pressure for increasing the power handling capacity [other wrong options] [Discuss in forum] improving conductivity of walls preventing higher modes from propagation varying the wave impedance |
Q39 ⇒ Which of the following devices uses a slow wave structure? TWT [other wrong options] [Discuss in forum] Klystron two cavity amplifier Klystron multicavity amplifier Reflex klystron oscillator |
Q40 ⇒ Which of the following are true for magic tee in the given figure select the answer as per given c 2, 3 and 4 [other wrong options] [Discuss in forum] 1, 2 and 3 1, 2 and 4 1, 3 and 4 |
Or |