Electronics and Communication Engineering - Networks Analysis and Synthesis

21. 

A cable has an insulation resistance of 1010 ohms. If the length is doubled, the insulation resistance will be

A. 2 x 1010 Ω
B. 0.5 x 1010 Ω
C. 1010 Ω
D. 4 x 1010 Ω

Answer: Option B

Explanation:

Insulation resistance of cable is inversely proportional to length.


22. 

, i(t) =

A. 3e-4t - e-5t
B. 3e-4t - 2e-3t
C. 2e-4t - 5e-2t
D. 3e-4t - e-t

Answer: Option B

Explanation:

i(t) = 3e-4t - 2e-3t


23. 

In the figure shown, A1, A2, A3 are identical Ammeters. If A1 and A3 read 5 and 13 A respectively, reading of A2 will be

A. 8
B. 13 A
C. 18
D. 12 A

Answer: Option D

Explanation:

A2 = 132 - 25 12 A.


24. 

Which of the following pairs are correctly matched?

  1. Brune's realisation : realisation with ideal transformer.
  2. Cauer realisation : ladder realisation.
  3. Bott Duffin realisation : with non ideal transformer.
Select the answer using the following codes:

A. 1, 2 and 3
B. 2 and 3
C. 1 and 3
D. 1 and 2

Answer: Option D

Explanation:

Bott Duffins realisation does not use transformer.


25. 

The synthesis of minimum function was suggested by

A. O'Brune
B. R. Richards
C. Bott and Duffin
D. none of the above

Answer: Option A

Explanation:

The procedure is called Brune's synthesis.