Microwave Communication problems
- 1. In the given figure shows the equivalent circuit of a magic tee. If all ports are matched
Options- A. nE = nH = 2
- B. nE = nH = 0.707
- C. nE = 2, nH = 0.707
- D. nH = 0.707, nH = 2 Discuss
Correct Answer: nE = nH = 2
- 2. If ZTE is wave impedance for TE waves, Ed is maximum dielectric strength of insulating material, a and b are the width and height of a rectangular wave guide, the maximum power handling capability Pmax for TE10 mode is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 3. Assertion (A): Impatt diode can be used in both amplifiers and oscillators.
Reason (R): Impatt diode has a low resistance.
Options- A. Both A and R are correct and R is correct explanation of A
- B. Both A and R are correct but R is not correct explanation of A
- C. A is correct but R is wrong
- D. A is wrong but R is correct Discuss
Correct Answer: Both A and R are correct but R is not correct explanation of A
Explanation:
It exhibits negative resistance and operates on the principle of avalanche breakdown.
Impatt diode circuits are classified as broadly tunable circuit, low Q circuit and high Q circuit.
The impedance of Impatt diode is a few ohms. The word Impatt stands for Impact Avalanche Transit Time diode.
The features of Impatt diode oscillator are : frequency 1 to 300 GHz, Power output (0.5 W to 5 W for single diode circuit and upto 40 W for combination of several diodes), efficiency about 20%.
Its applications include police radar systems, low power microwave transmitter etc.
- 4. 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.
Options- A. Both A and R are correct and R is correct explanation of A
- B. Both A and R are correct but R is not correct explanation of A
- C. A is correct but R is wrong
- D. A is wrong but R is correct Discuss
Correct Answer: Both A and R are correct and R is correct explanation of A
Explanation:
Its special feature is easy access to top surface so that minor adjustments can be made after circuit fabrication.
The high dielectric constant of the substrate reduces guide wavelength and circuit dimensions.
A microstrip line is the most commomly used transmission structure for microwave integrated circuits.
- 5. PIN diode has
Options- A. p+ and n layers separated by i layer
- B. p+ and n+ layers separated by i layer
- C. p- and n- layers separated by i layer
- D. none of the above Discuss
Correct Answer: p+ and n+ layers separated by i layer
- 6. The word 'LORAN' means
Options- A. long range navigation
- B. long range TV transmission
- C. long range cable transmission
- D. either (b) or (c) Discuss
Correct Answer: long range navigation
- 7. The inductance of a twin feeder used to connect antenna to TV receiver is about
Options- A. 0.2 ? H/m
- B. 0.6 ? H/m
- C. 1.6 ? H/m
- D. 10 ? H/m Discuss
Correct Answer: 1.6 ? H/m
- 8. In an infinite line the input impedance at every point is equal to characteristic impedance.
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. The domain mode in rectangular waveguide is
Options- A. TE01
- B. TE02
- C. TE10
- D. TM11 Discuss
Correct Answer: TE10
- 10. The number of PM radio channels which can be accommodated in a spectrum of 300 MHz is about
Options- A. 10
- B. 100
- C. 500
- D. 1500 Discuss
Correct Answer: 1500
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