Reflectors and lens antennas are commonly used

1.  In LF communication systems

2.  Not beyond 100KHz

3.   In the range 10MHz to 100MHz

4.  Above 100 MHz

View Answer  
4
Correct Answer :

Above 100 MHz


Explanation :
No Explanation available for this question

Measurement of radiation resistance by reflection method is suitable for

1.  Parasitic element antennas

2.  Low frequency vertical conductor antenna

3.  All type of antennas

4.  None of the above

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4
Correct Answer :

Parasitic element antennas


Explanation :
No Explanation available for this question

The Thevenin equivalent of the network shown in Fig. I is 10 v in series with a resistance of 2 if now, a resistance of 3 ? is connected across AB as shown in Fig. II, the Thevenin equivalent of the modified network across AB will be

1.  10 V in series with 1.2 resistance

2.  6 V in series with 1.2 ? resistance

3.  10 V in series with 5 ? resistance

4.  6 V in series with 5 ? resistance

View Answer  
4
Correct Answer :

6 V in series with 1.2 ? resistance


Explanation :
No Explanation available for this question

A certain network consist of two ideal voltage sources and a large number of ideal resistors. The power consumed in one of the resistor is 4 W when either of the two sources is active and the other is replaced by a short circuit. The power consumed by the same resistor when both the sources are simultaneously active would be

1.  Zero or 16 W

2.  4 W or 8 W

3.  Zero or 8 W

4.   8 W or 16 W

View Answer  
4
Correct Answer :

Zero or 8 W


Explanation :
No Explanation available for this question

Antenna radiation efficiency is given by

1.  

2.  

3.  

4.  None of these

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

The circuit shown in the given figure is steady-state with switch ‘S’ open. The switch is closed at t=0. The values of vc(0+) and vc(∞) will be respectively

1.  2 V, 0 V

2.   0 V, 2 V

3.  2 V, 2 V

4.   0 V, 0 V

View Answer  
4
Correct Answer :

2 V, 0 V


Explanation :
No Explanation available for this question

After closing the switch ‘S’ at t = 0, the current i(t) at any instant ‘t’ in the network shown in the given figure will be

1.  10 + 10 e100 t

2.  10 – 10 e100 t

3.  10 + 10 e-100t

4.  10 – 10 e-100t

View Answer  
4
Correct Answer :

10 – 10 e-100t


Explanation :
No Explanation available for this question

Antenna aperture efficiency is given by

1.  

2.  

3.  

4.  None of these

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

The pole-zero configuration of a network transfer function is shown in the given figure. The magnitude of the transfer function will

1.  Decrease with frequency

2.  Increase with frequency

3.  Initially increase and then decrease with frequency

4.   Be independent of frequency

View Answer  
4
Correct Answer :

Be independent of frequency


Explanation :
No Explanation available for this question

Consider the following statements 1. The two-port network shown below does NOT have an impedance matrix representation. 2. The following two-port does NOT have an admittance matrix representation. 3. A two-port network is said to be reciprocal if it satisfies z12 = z21 or an equivalent relationship. Of these statements

1.  1 and 2 are correct

2.   1, 2 and 3 are correct

3.  1 and 3 are correct

4.  None is correct

View Answer  
4
Correct Answer :

1, 2 and 3 are correct


Explanation :
No Explanation available for this question
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