Exercise: Exam Question Papers
Questions for: Exam Question Papers
Find I for circuit shown below
Answer: C
Mesh Analysis
Apply KVL at loop 2
125i2 - 100i3 = 0 ...(i)
Apply KVL at loop 3
120i3 - 100i2 - 20i1 = 0
i1 = 5A
∴ 120i3 - 100i2 - 100 = 0
∴ 120i3 - 100i2 = 100 ...(ii)
From (i) 125i2 - 100i3 = 0
...(iii)
Put equation (iii) in eq. (ii)
120i 3 - 100i2 = 100
120 x 
- 100i2 = 100
150i2 - 100i2 = 100
∴ 50i2 = 100
∴ i2 = 2A.
The electric field of uniform plane wave is given by E = 20 sin (2 p x 108t- pz) 
x + 20 cos (2 p x 108t - pz) y. The corresponding magnetic field is
x + 20 cos (2 p x 108t - pz) y. The corresponding magnetic field is
A: 
B: 
C: 
D: 
Answer: C
∴ H = Hx + Hy
.
Consider the probability density f(x) = ae-b|x| where x is a random variable whose allowable values range from x = - ∞ to x = + ∞. The Cdf (Cumulative distribution function) for x ≥ 0 is :
A: 
B: 
C: 
D: 
Answer: B
.
The reduced form of the function
X(E, A, B, C, D) = ∑(0, 1, 2, 3, 4, 7, 8, 9, 10, 12, 15, 16, 17, 18, 19, 20, 23, 24, 25, 26, 28, 31) is
X(E, A, B, C, D) = ∑(0, 1, 2, 3, 4, 7, 8, 9, 10, 12, 15, 16, 17, 18, 19, 20, 23, 24, 25, 26, 28, 31) is
A: 
B: 
C: 
D: 
Answer: A
X =(A + B + D)(A + B + D) (A + B + C + D)
=(D + A D + B D + AB + A D + A B + B D) (A + B + C + D)
=(D + AB + A B)(A + B + C + D)
.
The impulse response h(t) of a linear invariant continuous time system is given by h(t) = exp (- 2t) u(t), where u(t) denotes the unit step function. The frequency response H(ω) of this system in terms of angular frequency ω is given by H(ω)
A: 
B: 
C: 
D: 
Answer: C
H(ω) = 
e-2t e-jωt 
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