McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 1. |
. Which of the following parameters is not a primary parameter? |
| A. | resistance |
| B. | attenuation constant |
| C. | capacitance |
| D. | conductance |
| Answer» B. attenuation constant | |
| 2. |
ohm is |
| A. | 50 |
| B. | 20 |
| C. | 1000 |
| D. | 125 |
| Answer» D. 125 | |
| 3. |
For a matched line, the input impedance will be equal to |
| A. | load impedance |
| B. | characteristic impedance |
| C. | output impedance |
| D. | zero |
| Answer» B. characteristic impedance | |
| 4. |
wave ratio of 2.5 is |
| A. | 20 |
| B. | 125 |
| C. | 200 |
| D. | 75 |
| Answer» B. 125 | |
| 5. |
The average power in an electromagnetic wave is given by |
| A. | propagation constant |
| B. | pointing vector |
| C. | phase constant |
| D. | attenuation constant |
| Answer» B. pointing vector | |
| 6. |
The characteristic impedance of a transmission line is normally chosen to be |
| A. | 50 |
| B. | 75 |
| C. | 50 or 75 |
| D. | 100 |
| Answer» C. 50 or 75 | |
| 7. |
Identify the material which is not present in a transmission line setup. |
| A. | waveguides |
| B. | cavity resonator |
| C. | antenna |
| D. | oscillator |
| Answer» D. oscillator | |
| 8. |
respectively. The standing wave ratio is |
| A. | 2 |
| B. | 3 |
| C. | 1/2 |
| D. | 4 |
| Answer» B. 3 | |
| 9. |
The range of the standing wave ratio is |
| A. | 0 < s < 1 |
| B. | -1 < s < 1 |
| C. | 1 < s < ∞ |
| D. | 0 < s < ∞ |
| Answer» C. 1 < s < ∞ | |
| 10. |
The best stub selection for the transmission line will be |
| A. | series open |
| B. | series short |
| C. | shunt open |
| D. | shunt short |
| Answer» D. shunt short | |
| 11. |
The phenomenon employed in the waveguide operation is |
| A. | reflection |
| B. | refraction |
| C. | total internal reflection |
| D. | adsorption |
| Answer» C. total internal reflection | |
| 12. |
The dominant mode in waveguide is the mode which has |
| A. | highest frequency |
| B. | highest wavelength |
| C. | lowest phase constant |
| D. | highest attenuation |
| Answer» B. highest wavelength | |
| 13. |
The modes are calculated from which parameter? |
| A. | frequency |
| B. | wavelength |
| C. | phase constant |
| D. | v number |
| Answer» D. v number | |
| 14. |
The circular waveguides use which function in the frequency calculation? |
| A. | laplace function |
| B. | schottky function |
| C. | bessel function |
| D. | transfer function |
| Answer» C. bessel function | |
| 15. |
The scattering parameters are used to indicate the |
| A. | permittivity and permeability |
| B. | electric and magnetic field intensities |
| C. | reflection and transmission coefficients |
| D. | frequency and wavelength |
| Answer» C. reflection and transmission coefficients | |
| 16. |
For the matched line, the parameters S12 and S21 are |
| A. | 1 |
| B. | 0 |
| C. | -1 |
| D. | ∞ |
| Answer» B. 0 | |
| 17. |
The waveguides are materials with characteristics of |
| A. | low bulk resistivity |
| B. | high bulk resistivity |
| C. | high conductivity |
| D. | low conductivity |
| Answer» A. low bulk resistivity | |
| 18. |
range of |
| A. | hz |
| B. | khz |
| C. | mhz |
| D. | ghz |
| Answer» D. ghz | |
| 19. |
In rectangular waveguides, the dimensions a and b represent the |
| A. | broad wall dimensions |
| B. | broad wall and side wall dimension respectively |
| C. | side wall and broad wall dimension respectively |
| D. | side wall dimensions |
| Answer» B. broad wall and side wall dimension respectively | |
| 20. |
The cut off frequency for a waveguide to operate is |
| A. | 3 mhz |
| B. | 3 ghz |
| C. | 6 mhz |
| D. | 6 ghz |
| Answer» D. 6 ghz | |
| 21. |
In transverse electric waves, which of the following is true? |
| A. | e is parallel to h |
| B. | e is parallel to wave direction |
| C. | e is transverse to wave direction |
| D. | h is transverse to wave direction |
| Answer» C. e is transverse to wave direction | |
| 22. |
The dominant mode in rectangular waveguide is |
| A. | te01 |
| B. | te10 |
| C. | tm01 |
| D. | tm10 |
| Answer» B. te10 | |
| 23. |
The propagation constant for a lossless transmission line will be |
| A. | real |
| B. | complex |
| C. | real and equal to phase constant |
| D. | complex and equal to phase constant |
| Answer» D. complex and equal to phase constant | |
| 24. |
Which of the following parameter is non zero for a lossless line? |
| A. | attenuation |
| B. | resistance |
| C. | conductance |
| D. | phase constant |
| Answer» D. phase constant | |
| 25. |
The phase and group velocities does not depend on which of the following? |
| A. | frequency |
| B. | wavelength |
| C. | phase constant |
| D. | attenuation constant |
| Answer» D. attenuation constant | |
| 26. |
amplifier. |
| A. | linear beam |
| B. | crossed field |
| C. | parallel field |
| D. | none of the mentioned |
| Answer» A. linear beam | |
| 27. |
reflector electrode after the cavity. |
| A. | backward wave oscillator |
| B. | reflex klystron |
| C. | travelling wave tube |
| D. | magnetrons |
| Answer» B. reflex klystron | |
| 28. |
A major disadvantage of klystron amplifier is: |
| A. | low power gain |
| B. | low bandwidth |
| C. | high source power |
| D. | design complexity |
| Answer» B. low bandwidth | |
| 29. |
The material out of which PIN diode is made is: |
| A. | silicon |
| B. | germanium |
| C. | gaas |
| D. | none of the mentioned |
| Answer» A. silicon | |
| 30. |
GaAs is used in the fabrication of GUNN diodes because: |
| A. | gaas is cost effective |
| B. | it less temperature sensitive |
| C. | it has low conduction band electrons |
| D. | less forbidden energy gap |
| Answer» D. less forbidden energy gap | |
| 31. |
GaAs is used in fabricating Gunn diode. Gunn diode is: |
| A. | bulk device |
| B. | sliced device |
| C. | made of different type of semiconductor layers |
| D. | none of the mentioned |
| Answer» A. bulk device | |
| 32. |
The mode of operation in which the Gunn diode is not stable is: |
| A. | gunn oscillation mode |
| B. | limited space charge accumulation mode |
| C. | stable amplification mode |
| D. | bias circuit oscillation mode |
| Answer» A. gunn oscillation mode | |
| 33. |
an IMPATT diode, it results in: |
| A. | avalanche multiplication |
| B. | break down of depletion region |
| C. | high reverse saturation current |
| D. | none of the mentioned |
| Answer» A. avalanche multiplication | |
| 34. |
maintain at safe limit. |
| A. | average current |
| B. | average voltage |
| C. | average bias voltage |
| D. | average resistance |
| Answer» A. average current | |
| 35. |
Expression for the characteristic impedance of a transmission line(λ/4) used for impedance matching is: |
| A. | z1=√(zₒr)l |
| B. | z1=√(zₒ/r)l |
| C. | z1=√(zₒ+r)l |
| D. | none of the mentioned |
| Answer» A. z1=√(zₒr)l | |
| 36. |
If there is no standing wave on a transmission line, then the value of SWR is: |
| A. | 1 |
| B. | 0 |
| C. | infinity |
| D. | insufficient data |
| Answer» A. 1 | |
| 37. |
When a λ/4 transmission line is used for impedance matching, then which of the following is valid? |
| A. | standing waves are present on the λ/4 transmission line |
| B. | no standing waves on the λ/4 transmission line |
| C. | standing waves are not present both on the feed line and the matching λ/4 line |
| D. | standing waves are present on both the feed line and the matching λ/4 line |
| Answer» A. standing waves are present on the λ/4 transmission line | |
| 38. |
The lowest mode of TE mode propagation in a circular waveguide is: |
| A. | te10 mode |
| B. | te00 mode |
| C. | te01 mode |
| D. | te11 mode |
| Answer» C. te01 mode | |
| 39. |
Which primary parameter is uniformly distributed along the length of the conductor? |
| A. | g |
| B. | c |
| C. | l |
| D. | r |
| Answer» D. r | |
| 40. |
Which of the following parameters does not exist in the transmission line equation? |
| A. | r |
| B. | zo |
| C. | zl |
| D. | propagation constant |
| Answer» A. r | |
| 41. |
Find the characteristic impedance of a quarter wave with input and load impedances given by 50 and 25 respectively. |
| A. | 50 |
| B. | 25 |
| C. | 75 |
| D. | 35.35 |
| Answer» D. 35.35 | |
| 42. |
Calculate the transmission coefficient, when the incident and transmitted amplitudes are 10 and 7 respectively. |
| A. | 17 |
| B. | 3 |
| C. | 10/7 |
| D. | 0.7 |
| Answer» D. 0.7 | |
| 43. |
The reflection coefficient of a transmission line having characteristic and load impedances as 50 and 30 ohm respectively is |
| A. | 1/4 |
| B. | 1/8 |
| C. | 1/2 |
| D. | 3/4 |
| Answer» A. 1/4 | |
| 44. |
The major disadvantage of single stub tuning is: |
| A. | it requires a variable length of line between the load and the stub |
| B. | it involves 2 variable parameters |
| C. | complex calculation |
| D. | none of the mentioned |
| Answer» A. it requires a variable length of line between the load and the stub | |
| 45. |
In a double stub tuner circuit, the load is of _______ length from the first stub. |
| A. | fixed length |
| B. | arbitrary length |
| C. | depends on the load impedance to be matched |
| D. | depends on the characteristic impedance of the transmission line |
| Answer» B. arbitrary length | |
| 46. |
The major advantage of double stub tuning is: |
| A. | it uses 2 tuning stubs in fixed positions |
| B. | it involves 2 stubs |
| C. | length of the stub is variable |
| D. | none of the mentioned |
| Answer» A. it uses 2 tuning stubs in fixed positions | |
| 47. |
The modes of propagation supported by a rectangular wave guide is: |
| A. | tm, tem, te modes |
| B. | tm, te |
| C. | tm, tem |
| D. | te, tem |
| Answer» B. tm, te | |
| 48. |
Dominant mode is defined as: |
| A. | mode with the lowest cut off frequency |
| B. | mode with the highest cut off frequency |
| C. | any tem mode is called a dominant mode |
| D. | none of the mentioned |
| Answer» A. mode with the lowest cut off frequency | |
| 49. |
The product of the phase and the group velocities is given by the |
| A. | speed of light |
| B. | speed of light/2 |
| C. | 2 x speed of light |
| D. | (speed of light)/4 |
| Answer» D. (speed of light)/4 | |
| 50. |
For TE1ₒ mode, if the waveguide is filled with air and the broader dimension of the waveguide is 2 cm, then the cutoff frequency is: |
| A. | 5 mhz |
| B. | 7.5 mhz |
| C. | 7.5 ghz |
| D. | 5 ghz |
| Answer» C. 7.5 ghz | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.