Number of pulses on transmission line 200 meters long when pulses train consist of pulse with a duration of 30 nsec each and Separated ny 45 n sec. Speed of Em waves 3x108 meter/sec

1.  7

2.  8

3.  9

4.  10

View Answer  
4
Correct Answer :

9


Explanation :
No Explanation available for this question

Input impedance of a 4 meter length of a lossless transmission line having distributed shunt capacitance of 500 pF per meter and line terminated in a short circuit at 10 MHz; L=10μH.

1.  -j 270Ω

2.  j 270 Ω

3.  270 Ω

4.  -270 Ω

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4
Correct Answer :

-j 270Ω


Explanation :
No Explanation available for this question

Two lines are composed of T and π section of pure resistance. The series resistance are 100 ohm per section and shunt resistance are 200 ohms per section for each. The characteristic impedance when the resistance are lumped distributed, are

1.  45, 44, 944.72

2.  31.72, 31.52, 31.58

3.  22.77, 22.2, 22.35

4.  605, 63, 53.1

View Answer  
4
Correct Answer :

45, 44, 944.72


Explanation :
No Explanation available for this question

A 105 MHz, 90V lead signal is incident on a 50Ω transmission line. The velocity factor K of this line is 0.85. the line is 125 meter in length and terminated in a 300Ω load wavelength of the signal on a line is

1.  3

2.  2.43

3.  3.43

4.  4.43

View Answer  
4
Correct Answer :

2.43


Explanation :
No Explanation available for this question

A transmission line of Char. Impedance Z10=50ohm, phase velocity Vp=2x108m/sec and length l=1m is terminated by a load Z1=(30-j40)ohms. The input impedance of the line for a frequency of 100 MHz will be

1.  (30 +j 40) ohms

2.  (30-j 40) ohms

3.  (50 +j 40) ohms

4.  (50-j 40) ohms

View Answer  
4
Correct Answer :

(30-j 40) ohms


Explanation :
No Explanation available for this question

A short transmission line is represented as follow   The assumption mode is

1.  a low pass line

2.  low pass filter

3.  an infinite line

4.  a low loss line at high frequency

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4
Correct Answer :

a low loss line at high frequency


Explanation :
No Explanation available for this question

Cut-off frequency in a wave guide a=8.636 cm, b=4.318 cm fed by a 4 GHz carries form a coaxial cable for TM11 mode, will be

1.  1.737 GHz

2.  3.883 GHz

3.  6.883 GHz

4.  5.737 GHz

View Answer  
4
Correct Answer :

3.883 GHz


Explanation :
No Explanation available for this question

What is the mode of propagation in air filled square wave guide=1.2 cm and

1.  TE01

2.  TE11

3.  TE02

4.   None of these

View Answer  
4
Correct Answer :

TE02


Explanation :
No Explanation available for this question

What is the mode of propagation in wave guide a=2.26cm b=1.25cm at f=10GHz

1.  TE11

2.  TE01

3.  TE10

4.  TE20

View Answer  
4
Correct Answer :

TE10


Explanation :
No Explanation available for this question

Lose tangent is

1.  0.866

2.  0.5

3.  1.732

4.  0.577

View Answer  
4
Correct Answer :

1.732


Explanation :
No Explanation available for this question
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