Microwave Engineering Lab Viva Questions – Part 10

1. What is the value of TN(0) when N is odd

a) 0

b) 1

c) Depends upon the value of N

d) Does not exist

Answer : [A] 0

 

2. For a low pass filter prototype design, the normalized load resistance value is obtained as

1.9841, then the filter can be

a) Binomial filter of order 12

b) Binomial filter of order 11

c) Chebyshev filter of order 12

d) Chebyshev filter of order 11

Answer : [C] Chebyshev filter of order 12

3. A low pass filter prototype istransformed to a bandpass filter prototype. Then the inductor in

LPF prototype transfers to

a) A parallel combination of inductor and capacitor

b) A series combination of inductor and capacitor

c) Series capacitor

d) Shunt inductor

Answer : [B] A series combination of inductor and capacitor

4. Richard’s transformation is used for

a) Shunt inductor and series capacitor

b) Series inductor and Shunt capacitor

c) Shunt inductor and Shunt capacitor

d) Series inductor and Series capacitor

Answer : [B] Series inductor and Shunt capacitor

5. Unit elements in Kuroda’s identity is

a) Transmission line with length l/8 and characteristic impedance 1

b) Transmission line with length l/8 and characteristic impedance √2

c) Transmission line with length l/4 and characteristic impedance 1

d) Transmission line with length l/4 and characteristic impedance √2

Answer : [A] Transmission line with length l/8 and characteristic impedance 1

6. Which one is a commensurate line filter implementation?

a) Stepped impedance filter design

b) Redundant filter synthesis

c) Coupled line filter design

d) Image parameter filter synthesis

Answer : [B] Redundant filter synthesis

7. Which among the following is an amplifier

a) Reflex Klystron

b) Magnetron

c) Gunn diode

d) Travelling wave tube

Answer : [D] Travelling wave tube

8. The work done by the magnetic field on an electron inside a magnetron of cathode to anode

distance d is

a) 0

b)‬

e(V X B)

c)

‬

e(V X B).d

d) Depends upon the anode voltage

Answer : [A] 0

9. For a given anode voltage the magnetron will work properly if

a) magnetic field is equal to the cut off magnetic field

b) magnetic field is less than the cut off magnetic field

c) magnetic field is greater the cut off magnetic field

d) independent of the magnetic field

Answer : [C] magnetic field is greater the cut off magnetic field

10. Which of the devices are O-type microwave tubes?

a) Magnetron and Klystron

b) TWT and Magnetron

c) Gunn oscillator and Magnetron

d) TWT and Klystron

Answer : [D] TWT and Klystron