Users Also Read
Read MCQ's/Objective questions
MCQ's Search Engine
Analog Electronics
Automatic Control Systems
Communication Systems
Digital Electronics
Electromagnetic Field Theory
Electronic Devices and Circuits
Materials and Components
Measurements and Instrumentation
Microprocessors
Networks Analysis and Synthesis
Power Electronics
Radio Receivers
Satellite Communication
Signals and Systems
Exam Questions Papers
Matching Questions
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. |
Q1 ⇒ If D is diameter of circular waveguide the cutoff wave-length for TE11 mode is equal to 1.706 D [other wrong options] [Discuss in forum] 2.11 D 0.82 D 0.41 D |
Q2 ⇒ Assertion (A): In TE mode for rectangular waveguide. Reason (R): In TM mode for rectangular waveguide. 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 |
Q3 ⇒ A radar has a maximum range of 120 km. The maximum allowable pulse repetition frequency for unambiguous reception is 1250 [other wrong options] [Discuss in forum] 330 2500 8330 |
Q4 ⇒ If air pressure in a rectangular waveguide is increased the maximum power handling capacity is increased [other wrong options] [Discuss in forum] is decreased remains the same may increase or decrease depending on pressure |
Q5 ⇒ In a magnetron the magnetic flux density is of the order of 1 mWb/s [other wrong options] [Discuss in forum] 1 Wb/m2 106 m/s 1012 m/s |
Q6 ⇒ Effect of loading of line is increase in Z0 and β but decrease in a [other wrong options] [Discuss in forum] increase in Z0, a and β decrease in Z0, a and β decrease in Z0 and β but increase in a |
Q7 ⇒ The first and second subscripts in models of circular waveguides depict the number of full sine wave variations in circumference in direction and Bessel function variations in radial direction respectively [other wrong options] [Discuss in forum] the Bessel function variations in radial direction and the number of full sine wave variations in circumference direction respectively the Bessel function variations in circumference direction and number of full sine wave variations in radial direction respectively none of the above |
Q8 ⇒ Oscillations are obtained from a reflex klystron only for combinations of anode voltage and repeller voltage that give a favourable transit time. TRUE [other wrong options] [Discuss in forum] FALSE |
Q9 ⇒ If the peak transmitted power in a radar is increased by a factor 81, the maximum range is increased by a factor of 3 [other wrong options] [Discuss in forum] 9 27 81 |
Q10 ⇒ Which one of the following is also called 'rat race'? Hybrid ring [other wrong options] [Discuss in forum] E plane tee H plane tee Magic tee |
Q11 ⇒ A microwave connector should have high SWR. FALSE [other wrong options] [Discuss in forum] TRUE |
Q12 ⇒ Slotted line can be used for measurement of high frequencies TRUE [other wrong options] [Discuss in forum] FALSE |
Q13 ⇒ In the given figure the line voltage after a number of reflections wil 10 V [other wrong options] [Discuss in forum] 30 V -30 V -10 V |
Q14 ⇒ What is the numerical aperture an optical fiber when critical angle is 30°? 0.5 [other wrong options] [Discuss in forum] 0.704 0.866 0.2 |
Q15 ⇒ A waveguide connected to a circularly polarized antenna must be able to efficiently propagate both vertically and horizontally polarised waves. TRUE [other wrong options] [Discuss in forum] FALSE |
Q16 ⇒ Assertion (A): Slotted line is frequently used for microwave measurements. Reason (R): The unknown impedance is mounted at the end of slotted line. 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 |
Q17 ⇒ Assertion (A): TWT uses a focussing mechanism to prevent the electron beam from spreading. Reason (R): In a TWT the electron beam has to travel a much longer distance than in klystron. 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 |
Q18 ⇒ The most commonly used magnetron is cylindrical [other wrong options] [Discuss in forum] parallel plate inclined plate flat plate |
Q19 ⇒ The velocity factor of a transmission line depends on relative permittivity of dielectric [other wrong options] [Discuss in forum] temperature skin effect none of the above |
Q20 ⇒ For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about 14000 MHz [other wrong options] [Discuss in forum] 1000 MHz 5000 MHz 140000 MHz |
Or |