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EC2403 RF AND MICROWAVE ENGINEERING
QUIZ - I
BY,C.KARTHIK.
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1.What is the range of micro wave in EM
wave?
a)109 to 1011 Hz
b)3×108 to 3×1011
c)3×109 to 3×1011
d)108 to 1011
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2.What is the range of wavelength for
Microwaves?
a) 30cm to 0.3 cm
b)30m to 0.3 m
c)30 cm to 0.3m
d)30mm to 0.3cm
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3.Which frequency is not matched with its
band?
a)VHF =0.5 to 1.0
b)Ku=12.4 to18.0
c)S=4.0 to 8.0
d)V=75.0 to 110.0
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4.Which technique is suitable to make IC?
a) Hybrid
b) Monolithic
c) both hybrid and Monolithic
d) typrid
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5.Which parameters are used to analyze
microwave circuits?
a) Hybrid
b) ABCD
c) Z or Y
d) Scattering
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6.What is/are the impedance and the admittance matrices in reciprocal network?
a) 0
b) Yij=Yji
c) Zii=Zjj
d) [I ]
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7.What is the scattering matrix equation ?
a)b1 = S21a1+S12a2
b)b2=S11a2+S21a1
c)b1=S11a1+S12a2
d)b2=S12a2+S11a1
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8. What is called the return loss?
a)10 log(Pi/Pr)
b)10log(Pr/Pi)
c)10log(Pr-Pi)/Pi
d) 20log(Po/Pi)
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9. What is the condition for perfectly
matched load ?
a) 1
b) 0
c) 2
d)-1
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10.What is property of [S] matrix for
lossless network?
a) Symmetrical
b) unitary
c) Phase shift property
d) linear property
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11. What is the incident power at nth port?
a)1/2|an|2
b)1/2|bn|2
c)1/2|cn|2
d)1/2|dn|2
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12. What is the total output voltage in two
port network?
a)V=V⁺+V ⁻
b)V=V -V ⁺ ⁻
c)V=V *V ⁺ ⁻
d) V=V /V⁻ ⁺
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13.What is the total output current in two
port network?
a)I=I⁺+I ⁻
b)I=I -I ⁺ ⁻
c)I=I *V ⁺ ⁻
d) I=I /I⁻ ⁺
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14.What is called Insertion loss ?
a)10 log(Pi/Pr)
b)10log(Pi/Po)
c)10log(Pr-Pi)/Pi
d) 20log(Po/Pi)
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15. What is called Transmission loss ?
a)10 log(Pi/Pr)
b)10log(Pi/Po)
c)10log[(Pi-Pr)/Po ]
d) 20log(Po/Pi)
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16. What is the Scattering matrix
representation for two port network?
a)
b)
c)
d)
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17. What is the Z parameter matrix
representation?
a)
b)
c)
d)
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18. What is the h- parameter matrix
representation?
a)
b)
c)
d)
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19. What is the reflection coefficient Г1 at
the port 1 when port 2 is terminated with
matched load?
a ) S11=(b1/a1)a2=0
b) S21=(b2/a1)a2=0
c) S22= (b2/a2)a1=0
d) S12=(b1/a2)a1=0
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20.What is the relation between [S] and
[z] matrices?
a)[S]=([Z]+Z0[u])-1([Z]-Z0[u])
b) [S]=(Y0[u]+[Y])-1([Y0[u]-[Y])
c)c=1/Z21
d)D=Z22/Z21
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21. What is the relation between [S]
and [y] matrices?
a)[S]=([Z]+Z0[u])-1([Z]-Z0[u])
b) [S]=(Y0[u]+[Y])-1([Y0[u]-[Y])
c)c=1/Z21
d)D=Z22/Z21
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22. Which property helps the [s] matrix a
quick check of power balance of lossless
structures..?
a)Symmetrical
b) Unitary
c) reciprocity
d)Linear
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23. What is the normalized voltage for n
port network in microwave?
a) a=I-/ & b=I⁺/
b) a=V⁺/ & b=V⁺/
c) a=V⁺/ & b=V-/
d) a=V⁺/ & b=I-/
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24. What is the S matrix for Ideal
phase shifter?
a)
b)
c)
d)
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25.What is VHF frequency range?
a)10-100mhz
b)25-40mhz
c)26.5-40ghz
d)88-108mhz
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26.What is Quality factor ,Q?
a)XL/Rs
b)Xs/Rs
c)RL/Rs
d)Xl/RL
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27.What is the Resistance of the wire
R?
a)pl/A
b)Pb/A
c)ps/d
d)pr/r
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28.What networks are used to stabilize
the amplifier?
a)terminated
b)computer
c)nodal
d)matched
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29.What is Operating power gain?
a)PL/Pr
b)PL/Pin
c)Pout/Pin
d)Ps/PL
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30. Which feedback does provide the
condition IЃI>1?
a)negative
b)positive
c)series
d)shunt
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31. Which state does give the condition
IS22I<1?
a)stable
b)unstable
c)temporary
d)oscillations
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32. What is called noise figure?
a)output voltage/input voltage
b)input SNR/output SNR
c)load/source
d)Smax/Smin
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33.What is Loaded quality factor Ql?
a)f0/BW
b)BW/f0
c)Fs/BW
d)BW/fs
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34.What is the relationship between nodal
and loaded quality factor ?
a)Ql=Qn/4
b)Ql=Qn/2
c)Ql=Qn*2
d)Qn=Ql/2
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35. Which state does give the condition
IЃI>1?
a)Stable
b)unstable
c)Un condition
d)constant
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36.What is the condition for unilateral
power gain?
a)S22=0
b)S11=0
c)S12=0
d)S21=0
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37. What is Power matched factor m?
a)Rs/RL
b)Rl/Rs
c)Xc/Xl
d)Xl/Xc
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38.What is the other name of two
element network?
a)M-type
b)π-type
c)L-type
d)n-type
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39. Which is the major technical
consideration to choose matching
network?
a)Stability
b)Dc biasing
c)frequency response
d)all the above
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40.What is the Frequency of Ka band?
a)20-40mhz
b)3-30mhz
c)1-2Ghz
d)27-40Ghz
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41. Which is three port components?
a) adapter
b) waveguide tees
c)phase shifter
d) directional coupler
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42.What is the another name of E-plane tee?
a) Series tee
b) shunt tee
c) Multi port tee
d) sum tee
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43. What is another name of H plane tee?
a) Series tee
b) shunt tee
c) Multi port tee
d) difference arm tee
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44. What is the another name of Magic-T?
a) Series tee
b) shunt tee
c) Hybrid tee
d) sum tee
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45.What is the use of Corners and bends?
a) equate the direction of the wave
b) alter the direction of the guide to any angle
c) find the phase shift
d) find the propagation range
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46.How the discontinuity effects can be reduced in the wave guide bend?
a)keeping minimum radius of curvature R=2b for E bend, R=2a for H bend
b) keeping minimum radius of curvature R=1b for E bend, R=1a for H bend
c) keeping minimum radius of curvature R=2.5b for E bend, R=2.5a for H bend
d) keeping minimum radius of curvature R=1.5b for E bend, R=1.5a for H bend
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47. What is the use of the wave guide twist?
a) equate the direction of the wave
b) alter the direction of the guide to any angle
c) find the phase shift
d)to change the polarization of the propagating waves
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48. What is the length of the twist?
a)an even multiple of quarter guide wave length
b) an odd multiple of quarter guide wave length
c) an odd multiple of half guide wave length
d) an even multiple of half guide wave length
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49. Which type of device is called directional coupler?
a)active three port device
b) passive three port device
c) passive four port device
d) wave guide tee
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50. What is the coupling parameter of the directional coupler?
a)10 log(P1/P4)
b) 10 log(P1/P2)
c) 10 log(P4/P3)
d) 10 log(P1/Pr)
![Page 52: 1.What is the range of micro wave in EM wave? a)10 9 to 10 11 Hz b)3×10 8 to 3×10 11 c)3×10 9 to 3×10 11 d)10 8 to 10 11](https://reader035.vdocument.in/reader035/viewer/2022062806/5697bfa71a28abf838c989aa/html5/thumbnails/52.jpg)