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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 7
41.
If a signal f(t/2) has energy is E/n then energy of the signal f(nt) is equal to __________ (n is constant)
E/2n2
2E/n2
E/n2
2En2
Answer: Option
Explanation:

∴

dt = 2 dV

∴

∴

42.
The surface charge density on a conductor is 1.55 x 10-9C/m2. The conductor is immersed in water with ε = 78ε0.The electric field will be __________ .
3 V/m
1.55 V/m
2 V/m
2.25 V/m
Answer: Option
Explanation:

D = εE = 78ε0E

∴

E = 2.25 V/m.

43.
In the given figure
.
The damping coefficient for the given circuit is __________ .
1/2
1/4
2
1
Answer: Option
Explanation:

Damping coefficient is given by,

Substituting R = 1 Ω, L = 1 H

∴ .

44.
Consider the circuit

The line 1 is at stuck at '0' then output Z is equal to:
0
(C + D)
1
(A + B) + (C + D)
Answer: Option
Explanation:

Output of AND gate is 0

Thus Z = = (C + D).

45.
In a infinite ladder circuit as shown above each resistance of r Ω then find RAB
∞
1.61r
none of the above
Answer: Option
Explanation:

Let RAB = R

Since ladder is infinite we can assume RCD = R

∴ R = r + (r || R) =

∴

∴ Rr + R2 = r2 + 2rR

R = 1.61r or - 0.615r

R cannot be negative

∴ R = 1.61r.

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