microwave_engineering.pdf

8/13/2019 MICROWAVE_ENGINEERING.pdf

1/8

Code No: A107320402 Set No. 1JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

III B.Tech. II Sem., I Mid-Term Examinations, March 2010MICROWAVE ENGINEERING

Objective ExamName: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.

I Choose the correct alternative:

1. The frequency bands above 1 GHz are referred to as __________frequency bands [ ]

(A) Milliwave B) Low C) Microwave D) Very low

2. ________ is defined as the rate at which the wave propagates through the waveguide [ ]

(A) Phase Velocity (B) Group Velocity (C) Guide Velocity (D) Wave Velocity

3. The electric and magnetic fields inside the waveguide can be determined by solving from

______________ equations subject to the appropriate boundary conditions [ ]

(A) Thevenins (B) Nortons (C) Faradays (D) Maxwells

4. The Quality Factor (Q) of any resonant or anti-resonant circuit is a measure of frequencyselectivity and is defined by the equation Q = ________, where 0= resonant frequency,

P = average power loss and W = maximum energy stored [ ]

(A) WP0 (B)W

P0 (C)P

W0 (D)P

W

0

5. The microstrip line is also called ________________line [ ](A) an open-strip (B) a closed-strip (C) a semi-open (D) a semi-closed

6. A ________Tee is a waveguide tee in which the axis of its side arm is parallel to the E field of the

main waveguide [ ](A) B plane (B) D plane (C) E plane (D) H plane

7. The coupling loop placed at the centre of shorted end plate of the waveguide can also be used to

launch _______mode [ ]

(A) TE10 (B) TE20 (C) TE30 (D) TE408. In waveguide posts, when the depth is equal to _______, the post acts as a series resonant circuit

[ ]

(A)2

g (B)4

g (C)6

g (D)8

g

9. An ideal _______allows complete transmission between its two ports in one direction ofpropagation while no transmission occurs in the other direction [ ]

(A) coupler (B) circulator (C) isolator (D) gyrator

10. Ferrite is a generic name given to ferromagnetic or ferromagnetic insulators with _____as much as

1014

times greater than that of metals, dielectric constants around 10 to 15 or greater, and relative

permebilities of several thousands [ ](A) reluctivity (B) inductivity (C) capacitivity (D) resistivity

Cont..2

w.jntuworld.com

www.jntuworld.com


2/8

Code No. A107320402 :2: Set No.1

II Fill in the blanks:

11. The mode with the lowest cutoff frequency in a particular guide is called the _________mode

12. Hollow _________are commonly used as transmission lines at frequencies above 5 GHz

13. All the TM0mand TM1mmodes are degenerate in a uniform _____waveguide

14. For a homogeneous dielectric medium, the propagation-delay time per unit length is Td

=_____,where is the permeability of the medium and is the permittivity of the medium

15. In addition to the conductor and dielectric losses, microstrip line also has _______losses

16. A _________load or termination is a one-port component that absorbs all the power incident upon

it

17. A magic tee is a combination of the ________ tee and H-plane tee

18. In ______Tee, when the input is fed from side arm (port 3), the wave appearing at the two ports 1

and 2 of collinear arm will be in phase and in the same magnitude, that S13= S2319. Scattering parameters like S12, S21etc. give the ___________coefficients of the concerned port of

the network

20. _________is a multiport device such that wave incident on nth

port is coupled to (n+1)th

port only,

i.e., if power is incident in port 1, port 2 is coupled but not ports 3 and 4

-oOo-

w.jntuworld.com

www.jntuworld.com


3/8






1. The Quality Factor (Q) of any resonant or anti-resonant circuit is a measure of frequency

selectivity and is defined by the equation Q = ________, where 0= resonant frequency,P = average power loss and W = maximum energy stored [ ]

(A) WP0 (B)W

P0 (C)P

W0 (D)P

W

0

2. The microstrip line is also called ________________line [ ](A) an open-strip (B) a closed-strip (C) a semi-open (D) a semi-closed

3. A ________Tee is a waveguide tee in which the axis of its side arm is parallel to the E field of themain waveguide [ ]

(A) B plane (B) D plane (C) E plane (D) H plane

4. The coupling loop placed at the centre of shorted end plate of the waveguide can also be used tolaunch _______mode [ ]

(A) TE10 (B) TE20 (C) TE30 (D) TE405. In waveguide posts, when the depth is equal to _______, the post acts as a series resonant circuit

[ ]

(A) 2

g

(B) 4

g

(C) 6

g

(D) 8

g

6. An ideal _______allows complete transmission between its two ports in one direction ofpropagation while no transmission occurs in the other direction [ ]



1014


permebilities of several thousands [ ]

(A) reluctivity (B) inductivity (C) capacitivity (D) resistivity

8. The frequency bands above 1 GHz are referred to as __________frequency bands [ ](A) Milliwave B) Low C) Microwave D) Very low




______________ equations subject to the appropriate boundary conditions [ ](A) Thevenins (B) Nortons (C) Faradays (D) Maxwells

Cont..2

w.jntuworld.com

www.jntuworld.com


4/8

Code No. A107320402 :2: Set No.2


11. For a homogeneous dielectric medium, the propagation-delay time per unit length is

Td=_____,where is the permeability of the medium and is the permittivity of the medium


13. A _________load or termination is a one-port component that absorbs all the power incident uponit


15. In ______Tee, when the input is fed from side arm (port 3), the wave appearing at the two ports 1

and 2 of collinear arm will be in phase and in the same magnitude, that S13= S2316. Scattering parameters like S12, S21etc. give the ___________coefficients of the concerned port of

the network



port only,





-oOo-

w.jntuworld.com

www.jntuworld.com


5/8







main waveguide [ ](A) B plane (B) D plane (C) E plane (D) H plane

2. The coupling loop placed at the centre of shorted end plate of the waveguide can also be used tolaunch _______mode [ ]

(A) TE10 (B) TE20 (C) TE30 (D) TE40

3. In waveguide posts, when the depth is equal to _______, the post acts as a series resonant circuit[ ]

(A)2

g (B)4

g (C)6

g (D)8

g

4. An ideal _______allows complete transmission between its two ports in one direction of

propagation while no transmission occurs in the other direction [ ](A) coupler (B) circulator (C) isolator (D) gyrator

5. Ferrite is a generic name given to ferromagnetic or ferromagnetic insulators with _____as much as10

14times greater than that of metals, dielectric constants around 10 to 15 or greater, and relative

permebilities of several thousands [ ]

(A) reluctivity (B) inductivity (C) capacitivity (D) resistivity

6. The frequency bands above 1 GHz are referred to as __________frequency bands [ ]

(A) Milliwave B) Low C) Microwave D) Very low




______________ equations subject to the appropriate boundary conditions [ ]

(A) Thevenins (B) Nortons (C) Faradays (D) Maxwells

9. The Quality Factor (Q) of any resonant or anti-resonant circuit is a measure of frequency

selectivity and is defined by the equation Q = ________, where 0= resonant frequency,


(A) WP0 (B)W

P0 (C)P

W0 (D)P

W

0

10. The microstrip line is also called ________________line [ ]

(A) an open-strip (B) a closed-strip (C) a semi-open (D) a semi-closed

Cont..2

w.jntuworld.com

www.jntuworld.com


6/8

Code No. A107320402 :2: Set No.3



it


13. In ______Tee, when the input is fed from side arm (port 3), the wave appearing at the two ports 1and 2 of collinear arm will be in phase and in the same magnitude, that S13= S23

14. Scattering parameters like S12, S21etc. give the ___________coefficients of the concerned port ofthe network

15 _________is a multiport device such that wave incident on nth


port only,





19. For a homogeneous dielectric medium, the propagation-delay time per unit length is Td

=_____,where is the permeability of the medium and is the permittivity of the medium


-oOo-

w.jntuworld.com

www.jntuworld.com


7/8






1. In waveguide posts, when the depth is equal to _______, the post acts as a series resonant circuit

[ ]

(A)2

g (B)4

g (C)6

g (D)8

g

2. An ideal _______allows complete transmission between its two ports in one direction of

propagation while no transmission occurs in the other direction [ ]



1014


permebilities of several thousands [ ](A) reluctivity (B) inductivity (C) capacitivity (D) resistivity

4. The frequency bands above 1 GHz are referred to as __________frequency bands [ ](A) Milliwave B) Low C) Microwave D) Very low

5. ________ is defined as the rate at which the wave propagates through the waveguide [ ](A) Phase Velocity (B) Group Velocity (C) Guide Velocity (D) Wave Velocity


______________ equations subject to the appropriate boundary conditions [ ](A) Thevenins (B) Nortons (C) Faradays (D) Maxwells

7. The Quality Factor (Q) of any resonant or anti-resonant circuit is a measure of frequencyselectivity and is defined by the equation Q = ________, where 0= resonant frequency,


(A) WP0 (B)W

P0 (C)P

W0 (D)P

W

0

8. The microstrip line is also called ________________line [ ]

(A) an open-strip (B) a closed-strip (C) a semi-open (D) a semi-closed


main waveguide [ ]

(A) B plane (B) D plane (C) E plane (D) H plane

10. The coupling loop placed at the centre of shorted end plate of the waveguide can also be used to

launch _______mode [ ](A) TE10 (B) TE20 (C) TE30 (D) TE40

Cont..2

w.jntuworld.com

www.jntuworld.com


8/8

Code No. A107320402 :2: Set No.4


11. In ______Tee, when the input is fed from side arm (port 3), the wave appearing at the two ports 1and 2 of collinear arm will be in phase and in the same magnitude, that S13= S23

12. Scattering parameters like S12, S21etc. give the ___________coefficients of the concerned port of

the network



port only,





17. For a homogeneous dielectric medium, the propagation-delay time per unit length is Td=_____,where is the permeability of the medium and is the permittivity of the medium



it


-oOo-

w.jntuworld.com

microwave_engineering.pdf

Documents