Electrical engineering MCQ Quiz Hub

1. Stripline can be compared to a:
Flattened rectangular waveguide
Flattened circular waveguide
Flattened co axial cable
None of the mentioned

2. Which mode of propagation is supported by a strip line?
TEM mode
TM mode
TE mode
None of the mentioned

3. If the effective width of the center conductor is 3 mm and the distance between the two ground plates is 0.32 cm with the material of the dielectric used having a relative permittivity of 2.5, then what is the characteristic impedance of the strip line?
50Ω
71.071Ω
43.24Ω
121Ω

4. The wave number of a stripline operating at a frequency of 10 GHz is:
401
155
206
310

5. If the loss tangent is 0.001 for a stripline operating at 12 GHz with the relative permittivity of the dielectric material being used equal to 2.6, then the conductor loss is:
0.102
0.202
0.001
0.002

6. If the dielectric material used between the grounded plates of a stripline is 2.2, when the strip line operating at 8 GHz, the wavelength on stripline is:
1.2 cm
2.52 cm
0.15 cm
3.2 cm

7. Fields of TEM mode on strip line must satisfy:
Laplace’s equation
Ampere’s circuital law
Gaussian law
None of the mentioned

8. Micro strip can be fabricated using:
Photo lithographic process
Electrochemical process
Mechanical methods
None of the mentioned

9. The mode of propagation in a microstrip line is:
Quasi TEM mode
TEM mode
TM mode
TE mode

10. Microstrip line can support a pure TEM wave.
True
False
Microstrip supports only TM mode
Microstrip supports only TE mode

11. The effective di electric constant of a microstrip line is:
Equal to one
Equal to the permittivity of the material
Cannot be predicted
Lies between 1 and the relative permittivity of the micro strip line

12. The effective di electric constant of a micro strip line with relative permittivity being equal to 2.6, with a width of 5mm and thickness equal to 8mm is given by:
2.6
1.97
1
2.43

13. If the wave number of an EM wave is 301/m in air , then the propagation constant β on a micro strip line with effective di electric constant 2.8 is:
602
503.669
150
200

14. For most of the micro strip substrates:
Conductor loss is more significant than di electric loss
Di electric loss is more significant than conductor loss
Conductor loss is not significant
Di-electric loss is less significant

15. The wave number in air for EM wave propagating on a micro strip line operating at 10GHz is given by:
200
211
312
209

16. With an increase in the operating frequency of a micro strip line, the effective di electric constant of a micro strip line:
Increases
Decreases
Independent of frequency
Depends on the material of the substrate used as the microstrip line

17. The one below among others is not a type TEM line used in microwave networks:
Co-axial wire
Micro strip line
Strip lines
Surface guide

18. The one below is the only micro wave network element that is a TEM line:
Co-axial cable
Rectangular wave guide
Circular wave guide
Surface wave guide

19. The relation between voltage, current and impedance matrices of a microwave network is:
[V] = [Z][I]
[Z] = [V][I]
[I] = [Z][V]
[V] = [Z]-[I]

20. The relation between voltage, current and admittance matrices of a microwave network is:
[I] = [Y] [V]
[Y] = [V] [I]
[I] = [Z] [V]
[V] = [Z]-1[I]

21. Admittance and impedance matrices of a micro waves network are related as:
[Y] = [Z]-1
[Y] = [Z]
[V] = [Z] [Z]-1
[Z] = [V] [V]-1

22. For a reciprocal network, Z matrix is:
A unit matrix
Null matrix
Skew symmetric matrix
Symmetric matrix

23. For a lossless network, the impedance and admittance matrices are:
Real
Purely imaginary
Complex
Rational

24. S parameters are expressed as a ratio of:
Voltage and current
Impedance at different ports
Indecent and the reflected voltage waves
None of the mentioned

25. The relation between incident voltage matrix , reflected voltage matrix and S matrix for a microwave network:
[v-] = [s] [v+].
[v+] = [s] [v-].
[v-] [v] = [s].
[s] = [v] [v-].

26. The device used to get the measurement of S parameters of n- port micro wave network is:
CRO
Network analyzer
Circulator
Attenuator

27. Scattering matrix for a reciprocal network is:
Symmetric
Unitary
Skew symmetric
Identity matrix

28. Scattering matrix for a lossless matrix is:
Unitary
Symmetric
Identity matrix
Null matrix

29. If the reflection co efficient of a 2 port network is 0.5 then the return network loss in the network is:
6.5 dB
0.15 dB
6.020 dB
10 dB

30. If the reflection co efficient of a 2 port network is 0.25 then the return network loss in the network is:
12.05 dB
0.15 dB
20 dB
10 dB

31. ABCD matrix is used:
When there is two or more port networks in the cascade
To represent a 2 port network
To represent a 2 port network
To represent the impedance of a microwave network

32. ABCD matrix of the cascade connection of 2 networks is equal to:
Product of ABCD matrices representing the individual two ports
Sum of the ABCD matrices representing the individual two ports
Difference of the ABCD matrices representing the individual two ports
Sum of transpose of ABCD matrices representing the individual two ports

33. For simple impedance Z, the ABCD parameters are:
A=1, Z=B, C=0, D=1
A=0, B=1, C=1, D=0
A=Z, B=1, C=1, D=0
A=1, B=0, C=Z, D=1

34. For a simple admittance Y, the ABCD parameters are:
A=1, B=0, C=Y, D=1
A=Z, B=1, C=1, D=0
A=1, B=0, C=Z, D=1
A=1, Y=B, C=0, D=1

35. The matched network is placed between:
load and transmission line
source and the transmission line
source and the load
none of the mentioned

36. When a transmission line is matched to a load using a matched network, reflected waves are present:
between the load and the matched network
between the matched network and the transmission line
between the source and the transmission line
between the matched network and source

37. Impedance matching sensitive receiver components may improve the _____ of the system.
noise
SNR
amplification factor
thermal noise

38. One of the most important factors to be considered in the selection of a particular matching network is:
noise component
amplification factor
bandwidth
none of the mentioned

39. The simplest type of matching network, L section consists of _______ reactive elements.
One
two
four
six

40. The major limitation of a lumped elements matching ‘L’ network is:
they are not equally efficient at higher frequencies as they are at lower frequencies.
size of the network
they restrict flow of current
none of the mentioned

41. An ‘L’ network is required to match a load impedance of 40Ω to a transmission line of characteristic impedance 60Ω. The components of the L network are:
28.28+j0 Ω
28.28+j1 Ω
50Ω
48.9Ω

42. Which of the following material is not used in the fabrication of resistors of thin films?
nichrome
tantalum nitride
doped semiconductor
pure silicon

43. Large values of inductance can be realized by:
loop of transmission line
spiral inductor
coils of wires
none of the mentioned

44. A short transmission line stub can be used to provide a shunt capacitance of:
0-0.1µF
0-0.1pF
0-0.1nF
1-10pF

45. Slotted line is a transmission line configuration that allows the sampling of:
electric field amplitude of a standing wave on a terminated line
magnetic field amplitude of a standing wave on a terminated line
voltage used for excitation
current that is generated by the source

46. A slotted line can be used to measure _____ and the distance of _____________ from the load.
SWR, first voltage minimum
SWR, first voltage maximum
characteristic impedance, first voltage minimum
characteristic impedance, first voltage maximum

47. A modern device that replaces a slotted line is:
Digital CRO
generators
network analyzers
computers

48. If the standing wave ratio for a transmission line is 1.4, then the reflection coefficient for the line is:
0.16667
1.6667
0.01667
0.96

49. If the reflection coefficient of a transmission line is 0.4, then the standing wave ratio is:
1.3333
2.3333
0.4
0.6

50. If SWR=1.5 with a wavelength of 4 cm and the distance between load and first minima is 1.48cm, then the reflection coefficient is:
0.0126+j0.1996
0.0128
0.26+j0.16
none of the mentioned