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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 4
11.
Find RAB
1 Ω
2 Ω
Answer: Option
Explanation:

By solving

12.
For the network shown below, determine fHi and fHO, if, r0 = ∞, Cbe = 36 Pf, Cbc = 4 Pf, Cce = 1 Pf, Cwo = 8 Pf, Cwi = 6 Pf

where Cwo = wiring capacitance at output side, Cwi = wiring capacitance at input side
738.24 KHz, 8.6 MHz
781.2 KHz, 10.6 MHz
838.32 KHz, 9.2 MHz
938.24 KHz, 8.2 MHz
Answer: Option
Explanation:

Equivalent is

RTi = RS || R1 || R2 || Ri = 0.531 KΩ

Ci = Cwi + Cbe + (1 + AV)Cbc

= 6pf + 36pf + (1 - c - 90) 4 pf = 460 pf

RT2 = RC || RL = 4 K || 2.2 K = 1.419 KW

C0 = Cwo + Cce + CMO

13.
Complex pole in z-plane is as shown below. This is the pole diagram for __________ .
Decaying sinusoidal sequence
Growing sinusoidal sequence
Decaying non sinusoidal sequence
Growing non sinusoidal sequence
Answer: Option
Explanation:

Decaying sinusoidal sequence.

14.
Four messages band limited to W, W, 2W and 3W respectively are to be multiplex using Time Division Multiplexing (TDM). The minimum bandwidth required for transmission of this TDM signal is
W
3W
6W
7W
Answer: Option
Explanation:

In TDM minimum bandwidth is twice the maximum frequency present. Thus, 6W is the answer.

15.
Which of the following terms are equivalent?
  1. A ⊕ B ⊕ C
  2. A ⊕ B ⊙ C
  3. A ⊙ B ⊕ C
  4. A ⊙ B ⊙ C
1 and 4; 2 and 3
1 and 3
2 and 3
1, 2 and 4
Answer: Option
Explanation:

A ⊕ B ⊕ C = A (B ⊕ C) + A(B ⊕ C)

= A(B ⊙ C) + A (B ⊙ C) = A ⊙ B ⊙ C

A ⊕ B ⊙ C = A (B ⊙ C) + A(B ⊙ C)

= A(B ⊕ C) + A(B ⊕ C)

= A ⊙ B ⊙ C.

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