EC2403 RF AND MICROWAVE ENGINEERING

QUIZ - I

BY,C.KARTHIK.

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

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

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

4.Which technique is suitable to make IC?

a) Hybrid

b) Monolithic

c) both hybrid and Monolithic

d) typrid

5.Which parameters are used to analyze

microwave circuits?

a) Hybrid

b) ABCD

c) Z or Y

d) Scattering

6.What is/are the impedance and the admittance matrices in reciprocal network?

a) 0

b) Yij=Yji

c) Zii=Zjj

d) [I ]

7.What is the scattering matrix equation ?

a)b1 = S21a1+S12a2

b)b2=S11a2+S21a1

c)b1=S11a1+S12a2

d)b2=S12a2+S11a1

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)

9. What is the condition for perfectly

matched load ?

a) 1

b) 0

c) 2

d)-1

10.What is property of [S] matrix for

lossless network?

a) Symmetrical

b) unitary

c) Phase shift property

d) linear property

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

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⁻ ⁺

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⁻ ⁺

14.What is called Insertion loss ?

a)10 log(Pi/Pr)

b)10log(Pi/Po)

c)10log(Pr-Pi)/Pi

d) 20log(Po/Pi)

15. What is called Transmission loss ?

a)10 log(Pi/Pr)

b)10log(Pi/Po)

c)10log[(Pi-Pr)/Po ]

d) 20log(Po/Pi)

16. What is the Scattering matrix

representation for two port network?

a)

b)

c)

d)

17. What is the Z parameter matrix

representation?

a)

b)

c)

d)

18. What is the h- parameter matrix

representation?

a)

b)

c)

d)

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

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

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

22. Which property helps the [s] matrix a

quick check of power balance of lossless

structures..?

a)Symmetrical

b) Unitary

c) reciprocity

d)Linear

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-/

24. What is the S matrix for Ideal

phase shifter?

a)

b)

c)

d)

25.What is VHF frequency range?

a)10-100mhz

b)25-40mhz

c)26.5-40ghz

d)88-108mhz

26.What is Quality factor ,Q?

a)XL/Rs

b)Xs/Rs

c)RL/Rs

d)Xl/RL

27.What is the Resistance of the wire

R?

a)pl/A

b)Pb/A

c)ps/d

d)pr/r

28.What networks are used to stabilize

the amplifier?

a)terminated

b)computer

c)nodal

d)matched

29.What is Operating power gain?

a)PL/Pr

b)PL/Pin

c)Pout/Pin

d)Ps/PL

30. Which feedback does provide the

condition IЃI>1?

a)negative

b)positive

c)series

d)shunt

31. Which state does give the condition

IS22I<1?

a)stable

b)unstable

c)temporary

d)oscillations

32. What is called noise figure?

a)output voltage/input voltage

b)input SNR/output SNR

c)load/source

d)Smax/Smin

33.What is Loaded quality factor Ql?

a)f0/BW

b)BW/f0

c)Fs/BW

d)BW/fs

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

35. Which state does give the condition

IЃI>1?

a)Stable

b)unstable

c)Un condition

d)constant

36.What is the condition for unilateral

power gain?

a)S22=0

b)S11=0

c)S12=0

d)S21=0

37. What is Power matched factor m?

a)Rs/RL

b)Rl/Rs

c)Xc/Xl

d)Xl/Xc

38.What is the other name of two

element network?

a)M-type

b)π-type

c)L-type

d)n-type

39. Which is the major technical

consideration to choose matching

network?

a)Stability

b)Dc biasing

c)frequency response

d)all the above

40.What is the Frequency of Ka band?

a)20-40mhz

b)3-30mhz

c)1-2Ghz

d)27-40Ghz

 

41. Which is three port components?

a) adapter

b) waveguide tees

c)phase shifter

d) directional coupler

42.What is the another name of E-plane tee?

a) Series tee

b) shunt tee

c) Multi port tee

d) sum tee

43. What is another name of H plane tee?

a) Series tee

b) shunt tee

c) Multi port tee

d) difference arm tee

 

44. What is the another name of Magic-T?

a) Series tee

b) shunt tee

c) Hybrid tee

d) sum tee

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

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

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

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

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

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)