Electronics and Communication Engineering - Exam Questions Papers

Voltage reflection coefficient

Current reflection coefficient : r_i = - r_v = + 10.36 ∠111.296.

The given circuit can be compared to a Wheatstone's Bridge.

This bridge is balanced.

∴ R_eq = (10 + 10) || (20 + 20) = 20 || 40 = 13.33 Ω

∴ .

Let P = 1101 Q = 1101

Y_n = P_n ⊕ Q_n ⊕ R_n

Z = R_n Q_n + P_n R_n + Q_n P_n

Constructing truth table

So that, R_{n + 1} = Z_n 1 ≥ n ≥ 3

Z₄ = R₅(MSB)

Hence, output is 00010 which show that it is a 4 bit subtractor giving P - Q.

Using law of gravitations, the force between two point masses is F =

M₁ = mass of moon = 6.7 x 10²² kg

M₂ = mass of earth = 6 x 10²⁴ kg

r = distance between masses = 380 km

G = universal gravitational constant

= 6.7 x 10^{- 11} Nm²/Kg²

Let Q₁ and Q₂ be the charge on moon and earth respectively. Now the gravitational force must be balanced by the force of repulsion.

Q₁Q₂ = 4pε₀M₁M₂G

but Q₂ = 12.5Q₁

= 12.5 x 4pω₀M₁M₂G

∴ Q₂ = 6.11 x 10¹⁴

Q₂ = 61.11 TC

Q₁ = 4.89 TC.

a_-k = a^*_k for all values of k.

In fact, this equality holds whenever x[n] is real.