A short-circuited stub is shunt connected to a transmission line as shown in the figure is. If Z0 = 50 ohm, the admittance Y seen at the junction of the stub and the transmission line is

1.   (0.01 - j0.02) mho

2.  (0.02 - j0.01) mho

3.  (0.04 - j0.02) mho

4.  (0.02 + j0) mho

View Answer  
4
Correct Answer :

(0.01 - j0.02) mho


Explanation :
No Explanation available for this question

A rectangular metal wave guide filled with a dielectric material of relative permittivity εr = 4 has the inside dimensions 3.0 cm x 1.2 cm. The cut-off frequency for the dominant mode is

1.  2.5 GHz

2.  5.0 GHz

3.  10.0 GHz

4.  12.5 GHz

View Answer  
4
Correct Answer :

5.0 GHz


Explanation :
No Explanation available for this question

The approximate Bode magnitude plot of a minimum-phase system is shown in the figure. The transfer function of the system is

1.  108[(s+0.1)3/{(s+10)2(s+100)}]

2.  107[(s+0.1)3/{(s+10)(s+100)}]

3.  108[(s+0.1)2/{(s+10)2(s+100)}]

4.  109[(s+0.1)3/{(s+10)(s+100)2}]

View Answer  
4
Correct Answer :

108[(s+0.1)3/{(s+10)2(s+100)}]


Explanation :
No Explanation available for this question

Two  identical  antennas  are  placed  in  the  θ  =  ( π/2)  plane  as  shown  in  the  figure.  The elements  have  equal  amplitude  excitation  with  180°  polarity  difference,  operating  at wavelength λ. The  correct  value  of  the magnitude  of  the  far-zone  resultant  electric  field strength normalized with that of a single element, both computed for = 0, is

1.  2 cos (2πs/λ)

2.  2 sin (2πs/λ)

3.  2 cos (πs/λ)

4.  2 sin (πs/λ)

View Answer  
4
Correct Answer :

2 sin (πs/λ)


Explanation :
No Explanation available for this question

A second-order system has the transfer function {C(s)/R(s)} = 4/(s2 + 4s + 4) With r(t) as the unit-step function, the response c(t) of the system is represented by

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

The zero-input response of a system given by the state-space equation

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Choose the correct one from among the alternative A, B, C, D after matching an item in Group 1 with the most appropriate item in Group 2.   Group 1   Group 2 P Ring modulator 1 Clock recovery Q VCO 2 Demodulation of FM R Foster-Seely discriminator 3 Frequency conversion S Mixer 4 Summing the two inputs     5 Generation of FM     6 Generation of DSB-Sc  

1.  P-1, Q-3, R-2, S-4

2.  P-6, Q-5, R-2, S-3

3.  P-6, Q-1, R-3, S-2

4.  P-5, Q-6, R-1, S-3

View Answer  
4
Correct Answer :

P-6, Q-5, R-2, S-3


Explanation :
No Explanation available for this question

The voltage e0 in the figure

1.  2V

2.  4V/3

3.  4V

4.  8V

View Answer  
4
Correct Answer :

4V


Explanation :
No Explanation available for this question

If each branch of a delta circuit has impedance √3Z,then each branch of the equivalent Wye circuit has impedance

1.  Z/√3

2.  3Z

3.  3√3Z

4.  Z/3

View Answer  
4
Correct Answer :

Z/√3


Explanation :
No Explanation available for this question

The transfer function of a system is given by H(s)=1/s2(s-1) .The impulse response of the system is

1.  (t2*e-2t)U(t)

2.  (t2*e2t)U(t)

3.  (te-2t)U(t)

4.  (te-2t)U(t)

View Answer  
4
Correct Answer :

(t2*e2t)U(t)


Explanation :
No Explanation available for this question
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