# The main difference between the broad side arrays and end fire arrays is that

1.  Individual elements are fed with same current in broad side arrays and of different magnitude in end fire arrays

2.  In broad side arrays, the elements are equidistant whereas in end fire array the distance between elements increases

3.  The total number of total elements in broad side array is always one and a half times that of elements in end fire arrays

4.  In broad side array the individual elements are fed in, out of phase by 1800 whereas in end fire array individual elements are fed with currents of equal magnitude but their phases vary progressively along the line in such a way as to make the entire arrangement substantially unidirectional.

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In broad side array the individual elements are fed in, out of phase by 1800 whereas in end fire array individual elements are fed with currents of equal magnitude but their phases vary progressively along the line in such a way as to make the entire arrangement substantially unidirectional.

Explanation :
No Explanation available for this question

# A vertical earthed antenna is resonant when its physical height is equal to

1.  λ

2.  λ/2

3.  λ/4

4.  λ/8

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λ/4

Explanation :
No Explanation available for this question

# Consider the following polynomials 1. s4+7s3+17s2+17s+6. 2. s4+11s3+41s2+61s+30. 3. s4+s3+2s2+3s+2. Among these polynomials, those which are Hurwitz would include

1.   1 and 3

2.  2 and 3

3.   1 and 2

4.  1, 2 and 3

4

1 and 2

Explanation :
No Explanation available for this question

# In respect of the 2- port network shown in the figure, the admittance parameters are: Y11 = 8 mho, Y12 = Y21 = -6mho and Y22 =6 mho The values of YA, YS and YC(in units of mho) will be respectively

1.  2, 6 and -6

2.  2, 6 and 0

3.  2, 0 and 6

4.  2, 6 and 8

4

2, 0 and 6

Explanation :
No Explanation available for this question

# In the network shown, the switch is opened at t=o. Prior to that, the network was in the steady-state Vs(t) at t = 0+ is

1.  0

2.  5 V

3.  10 V

4.  15 V

4

10 V

Explanation :
No Explanation available for this question

# In the network shown in the figure, the switch had remained closed for a long time on the 10 V source side. If at time t = 0, it is changed to the 12 V side, then after one time constant, the voltage across 5 in the circuit will be

1.  5 V

2.  5 e-1 V

3.  10 V

4.  12 V

4

5 e-1 V

Explanation :
No Explanation available for this question

# In end fire array, the principle direction of radiation

1.  Is perpendicular to the array axis

2.  Is perpendicular to the array axis also to the plane containing the array elements

3.  Coincides with the direction of the array axis

4.   Is at 450 to the direction of array axis

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Coincides with the direction of the array axis

Explanation :
No Explanation available for this question

# The antenna radiation resistance can be increased by the

1.   Use of larger section of conductor

3.   Providing insulation on the conductor

4.  None of these

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Explanation :
No Explanation available for this question

# An initially relaxed RC-series network with R = 2 M and C = 1μ F is switched on to a 10 V step input. The voltage across the capacitor after 2 seconds will be

1.  zero

2.  3.68 V

3.  6.32 V

4.  10 V

4

6.32 V

Explanation :
No Explanation available for this question

1.   The principle direction radiation is perpendicular to the array axis and also to the plane containing the array elements

2.   The principal direction radiation is parallel to the array axis and also to the plane containing the array elements

3.  The principal direction radiation is parallel to the array axis and perpendicular to the plane containing the array elements

4.  The principal direction radiation is perpendicular to the array axis and parallel to the plane containing the array elements

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