A 200 volt(r.m.s) generator having an internal resistanmce of 200 ohm is feeding a loss-less transmission line. The characteristic impedance and the length of the line are 200 ohm and 10 m respectively. The line is terminated in a resistive load of 100 ohm. If the operating frequency is 37.5 Mhz calculate the a. Current drawn from the generator b. Magnitude and phase of the current flowing in the load c. Power delivered to the load

1.  1/3A, 1/3

2.  1/2A, 1/3

3.  1A, 1/3

4.  15A, 1/3

View Answer  
4
Correct Answer :

1/3A, 1/3<-900A, 9.875W


Explanation :
No Explanation available for this question

The dominant mode in a rectangular waveguide is TE10, because this mode has

1.  No attention

2.  No cut-off

3.  No magnetic field component

4.  The highest cut-off wavelength

View Answer  
4
Correct Answer :

No magnetic field component


Explanation :
No Explanation available for this question

The modes in a rectangular waveguide are denoted by TEmnTMmn where m and n are the eigen numbers along the larger and smaller dimensions of the waveguide smaller dimensions of the waveguide respectively. Which one of the following statements is

1.  The TM10 mode of the waveguide does not exist

2.  The TE10 mode of the waveguide does not exist

3.  The TM10 and the TE10 modes both exist and have the same cut-off frequencies

4.  The TM10 and the TM01 modes both exist and have same cut-off frequencies

View Answer  
4
Correct Answer :

The TM10 and the TE10 modes both exist and have the same cut-off frequencies


Explanation :
No Explanation available for this question

Choose the correct statements. For a wave propagating in an air filled rectangular wave guide

1.   Guided wavelength is never less than the free space wavelength

2.  Wave impedance is never less than the free space impedance

3.   Phase velocity is never less than the free space velocity

4.  TEM mode is possible if the dimensions of the wave guide are properly chosen

View Answer  
4
Correct Answer :

Phase velocity is never less than the free space velocity


Explanation :
No Explanation available for this question

The magnetic field along the propagation direction inside a propagation direction inside a rectangular wavelength with the cross section shown in the figure is Hz=3 cos (2.094 x 102x) cos(2.618 x 102y) cos (6.283 x 1010t- β z) The phase velocity vp of the wave inside the wavelength satisfies  

1.   vp>c

2.  vp=c

3.  0

4.   vp=0

View Answer  
4
Correct Answer :

vp=0


Explanation :
No Explanation available for this question

Two isotropic antennas are separated by a distance of two wavelengths. If both the antennas are fed with currents, the number of lobes in the radiation pattern in the horizontal plane is

1.   2

2.  4

3.  6

4.  8

View Answer  
4
Correct Answer :

6


Explanation :
No Explanation available for this question

In a uniform linear array, four isotropic radiating elements are spaced λ/4 apart. The progressive phase shift between the elements required or forming the main beam at 600 off the end-fire is

1.   –π rad

2.  –π/2 rad

3.  –π/4 rad

4.  –π/8 rad

View Answer  
4
Correct Answer :

–π/4 rad


Explanation :
No Explanation available for this question

In the radiation pattern of s 3-element array of isotropic radiation equally spaced at distance of λ/4 it is required to place a null at an angle of 33.56 degrees off the end-fire direction. Calculate the progressive phase shifts to be applied to the elements. Also calculate the angle at which the main beam is placed for this phase distribution

1.  600, 520

2.  500, 520

3.  400, 520

4.  300, 520

View Answer  
4
Correct Answer :

600, 520


Explanation :
No Explanation available for this question

25 persons are in a room 15 of them play hockey 17 of them play football and 10 of them play both hockey and football. Then the number of persons playing neither hockey nor football is

1.   2

2.  17

3.  13

4.  3

View Answer  
4
Correct Answer :

3


Explanation :
No Explanation available for this question

There are two candidates P and Q in an election. During the campaign, 40% of the voters promised to vote for P, and rest for Q. However, on the day of electron 15% of the voters went back on their promise to vote for P and instead voted for Q 25% of the voters went back on their promise to vote for Q and instead voted for P. Suppose, P lost by 2Votes, then was the total number of voters

1.   100

2.  10

3.  90

4.  95

View Answer  
4
Correct Answer :

100



Explanation :
No Explanation available for this question
Previous Next

Interview Questions

MongoDB
Java Script
Node JS
PHP
JQuery
Python