Thursday, 31 January 2013

Note:Don't think that these bits only repeated in second mid .Go through the last 4 units concepts thoroughly Then solve these bits.These bits to cross check your knowledge.

1. For normal incidence of the wave on perfect conductor [ b]

a) Surface current doesn’t exist b) surface exists

c) conducting current exiasts d) free charge exists on the surface

2. A standing wave [ d]

a) Progresses with less than light velocity b) progresses with more than light velocity

c) progresses with equal to light velocity d) does not progress.

3. The range of reflection coefficient is [ c]

a) 0 to 1 b) 0 to infinity c) -1 to 1 d) 1 to infinity

4. Electric and magnetic fields which are parallel [d ]

a)Constitute power flow b) constitute infinite power flow

c)constitute unit magnitude power flow d) no power flow.

5. The propagation velocity of TE waves [ a]

a)Depends on frequency b) independent of frequency

c) depends on square of frequency d) varies inversely with frequency.

6. As per the boundary condition, [b ]

a)The normal component of E is continuous across the boundary.

b)The tangential component of E is continuous across the boundary.

c)The tangential component of D is continuous across the boundary.

d)The normal component of H is continuous across the boundary

7. The magnetic field at the surface of a good conductor is 2A/m. The frequency of the field is 600 MHz. The surface r.m.s current density is [c ]

a)0.5 A/m b)0.5 A/m2 c)2 A/m d)2 A/m2

8. If the reflection coefficient is -1/2 then the swr is [ d]

a)Zero b) one c)1/3 d) 3

9. The wave impedance over the cross section of wave guide [d ]

a) Increases with frequency b) decreases with frequency

c) increases exponentially d) constant

10. Hysteresis and eddy current losses in loading coils leads to [c ]

a) Increase in L b) Decrease in L c) Increase in R d) decrease in R

1 1) Which of these is not a correct form of the wave Ex = cos(ωt —βz)? [b ]

(a) Ex = cos(βz-ωt) (b) Ex = cos(ωt —βz-Π/2) (c) Ex = Re[ej(ωt —βz)] (d) Ex = cos(2Πt/T-2Πz/λ)

12) What is the major factor for determining whether a medium is free space, lossless dielectric, lossy dielectric, or good conductor? [ c]

(a) Attenuation constant (b) Constitutive parameters (σ,μ,ε)

13) In a certain medium, E = 10 cos (108t — 3y) ax V/m. What type of medium is it? [ c]

(a) Free space (b) Perfect dielectric (c) Lossless dielectric (d) Perfect conductor

14) For any dielectric material ( σ/ωε) value is [a ]

a)<<1 b)>>1 c)=1 d)zero

15) Given that H = 0.5 e-0.1xsin (106t- 2x) ay A/m, which of these statements are incorrect? [ b]

(a) α = 0.1 Np/m (b)β = - 2 rad/m

16) Which of the following statements is not true of waves in general? [ a]

(a) It may be a function of time only. (b) It may be sinusoidal or cosinusoidal.

17) For a lossy transmission line, the characteristic impedance does not depend on [ b]

(a) The operating frequency of the line (b) The length of the line

18) Which of the following statements are not true of the line parameters R, L, G, and C? [c ]

(a) R and L are series elements. (b) G and C are shunt elements.

(c)G = 1/R (d) LC = με and RG = σε.

19) A lossless transmission line of length 50 cm with L = 10 μH/m, C = 40 pF/m is operated

at 30 MHz. Its electrical length is [c ]

(a) 20λ (b) 0.2λ (c) 108° (d) 40Π

20) Ex = cos(ωt +βz) represents a wave travelling in the __________________ [d ]

(a)-ve x-direction (b)+ve x-direction (c)+ve z-direction (d)-ve z-direction

21. An electromagnetic wave is to pass through an interface separating two media having dielectric constants ε1 and ε2 respectively. If ε1 = 4ε2 , the wave will be totally reflected if angle of incidence is [b ]

( a ) 00 ( b ) 300 ( c ) 450 ( d ) 600

22. The Snell’s law of refraction

23. The instantaneous rate of energy flow per unit area at a point is [a ]

( a ) E x H ( b) ( c ) B • ∇D • ∇( d ) ) (2 EHx∇∇

24. When electromagnetic waves are reflected at an angle from a wall, their wavelength along the wall is

[ c]

( a ) shortened because of the Doppler effect ( b) the same as in free space

( c ) greater than in the actual direction of propagation

( d ) same as the wavelength perpendicular to the wall

25. At the cut-off wave length, the wave between the walls of parallel plane guide [d ]

( a ) is travel almost parallel to the axis of the guide

( b ) is travel perpendicular to the axis of the guide

( c ) is travel in zig-zag path ( d ) has no wave motion

26. If the time dependence of voltage is given as e-jwt, then Voe-γz will represent [b]

( a ) forward travelling wave (b ) backward travelling wave (c ) standing wave (d ) refracted wave

27. A lossless line of length 500m has L=10μH/m and C=0.1pF/m at 1 MHz. The electrical length of the line is

[ c]

( a ) 3600 ( b ) 2700 ( c ) 1800 ( d ) 900

28. For an open circuited line which is not true [b ]

( a ) Zin = -jZo cotβl ( b ) ( c ) 1 −= Γ l 1 = Γ l ( d ) S = ∞

29. Short-circuited stubs are preferred to open-circuited stubs because the latter are [c ]

( a ) more difficult to make and connect

( b ) made of a transmission line with a different characteristic impedance

( c ) liable to radiate ( d ) incapable of giving a full range of reactances

30. For transmission-line load matching over a range of frequencies, it is best to use a [c ]

(a) balun (b) broadband directional coupler (c) double stub (d) single stub of adjustable position

SECTION-II: Fill in the blanks

1. The frequency at which the wave motion ceases is called Cutofffrequency.

2. A Lumped load line behaves as a Low pass filter

3. By inserting inductance in series with the line to increase the inductance is called

4. One neper is = 8.68 dB.

5. A short circuited λ/4 line can be used a Insulator

6. The range of UHF is 300 MHz to 3 Ghz

7. The loading practice is generally restricted to Cables only.

8. When a transmission line is shorted, the first voltage minimum occurs at Load

9. The center of smith chart represents Matched load impedance.

10. Attenuation factor of TEM wave is proportional to Square root. of frequency.

11.The relation between E and H in any medium is ____________

12) The value of intrinsic impedance of free space is 377Ω

13) In a perfect dielectric medium attenuation constant is Zero

14) The loss tangent value for a good conductor is ( σ/ωε)>>1

15) A wave propagating in a conducting medium attenuation constant and phase constant values are_____________

16) The conductivity of silver is 3x106 mho/m.If the skin depth is 1mm,find the frequency? 84.43kHz

17) Write the expression for reflection coefficient of a perfect dielectic surface when the wave incident normal to the boundary.

TR =(η2-η1)/(η2+η1)

18) The Poynting vector physically denotes the power density leaving or entering a given volume in a time-varying field

19) Brewster angle θB when the wave is parallally polarized is

20) Critical angle θc for the total internal reflection is

21. An electromagnetic wave is incident at air-conductor interface. If impedance of the conductor is 120π, the ratio of transmitted and incident electric fields is 2

22. The critical angle for a wave propagating from Teflon ( εr=4) into free space is 30˚

23. The orientation of the electric field with respect to the plane of incidence determines Polarization

of a wave at the interface between two different regions.

24. When the free-space wavelength of a signal equals the cutoff wavelength of the guide, the phase velocity of the signal becomes infinite

25. The wave impedances for waves between parallel planes are functions offrequency

26. A line is of a length ‘l’ has characteristic impedance ‘Zo’. The line is cut into half. The value of characteristic impedance becomes Zo

27. Impedance inversion may be obtained with Quarter wave line

28. The velocity factor of a transmission line depends on the dielectric constant of the material used

29. In a transmission line, the attenuation is given as 0.3dB/km. After 10km the power will be dielectric constant of the material used fraction of input power

30. In electromagnetic waves, polarization is due to the transverse nature of the waves

Wednesday, 30 January 2013

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Monday, 28 January 2013

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Chemistry (2013): Telugu MP3

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Sunday, 27 January 2013

Ryee Ryeee (2013): Telugu MP3

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Music : Sri Vasanth

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Saturday, 26 January 2013

Eyy (2013): Telugu MP3

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Wednesday, 23 January 2013

Swamy Ra Ra(2013)

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Sunday, 20 January 2013

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