1. Which of the following truly
reflects the power condition in a purely inductive circuit in which
an RMS current of „I‟ A is flowing due to a sinusoidal RMS
voltage „V‟ volt?
(A) P = VI sin 90° and Q = VI sin 90°
(B) P = VI sin 90° and Q = VI cos 90°
(C) P = VI cos 90° and Q = VI sin 90°
(D) P = VI cos 90° and Q = VI cos 90°
Answer : [C] P = VI cos 90° and Q = VI
sin 90°
2. Which of the following holds when a
sinusoidal voltage is applied to a pure inductance?
(A) In one half-cycle energy is
absorbed
(B) In the next half-cycle energy is
released
(C) Continuous exchange of energy
(D) All of these
Answer : [D] All of these
3. Which of the following is an
advantage of using Laplace transform techniques?
(A) Permits use of simple algebra
(B) Converts functions in the
time-domain into s-domain
(C) Initial conditions are
automatically taken care of
(D) Both (A) & (B)
(E) All of the above
Answer : [E] All of the above
4. Which of the following represents
correctly the Laplace transform of a step function defined from t=0
onwards and having the magnitude 4?
(A) 4
(B) 4 e −3s
(C) 4 e 3s
(D) 4 /s
(E) 4 e −3s /(s − 3)
(F) 4 e −3s /s
Answer : [D] 4 /s
5. Which of the following is a
characteristic of a unit impulse function?
(A) Infinite amplitude
(B) Unit area
(C) Zero time duration
(D) All of these
(E) Both (B) & (C)
Answer : [D] All of these
6. In order to analyze a two-port
network which of the following is the essential combination?
(A) Four independent variables and four
parameters
(B) Four independent variables and two
parameters
(C) Two independent variables and four
parameters
(D) Two independent variables and two
parameters
(E) All of the above
(F) None of the above
Answer : [C] Two independent variables
and four parameters
7. A particular 2-port network has
following transmission parameters, A = 5, B = 6, C =5, D= 7.
Then the two-port system is
(A) Reciprocal & Symmetrical
(B) Non reciprocal & Asymmetrical
(D) Non reciprocal & Symmetrical
(E) Reciprocal & Asymmetrical
(C) None
(F) All of the above
Answer : [B] Non reciprocal &
Asymmetrical
8. The parallel combination of a
capacitor C farads and an inductor L Henry is connected in
series with a resistor of R Ω. Which
of the following is the correct expression for Impedance
Z(s)?
(A)(Ls + R)/(LCs 2 + 1)
(B) (LCs + R)/(LCs 2 + 1)
(C)(RLCs + R)/(LCs 2 + 1)
(D) (RLCs 2 + R + Ls)/(LCs 2 + 1)
Answer : [D] (RLCs 2 + R + Ls)/(LCs 2 +
1)
10. Let f (t) is any function, and then
lim t→0 f t = lim t→∞ f(t) will be satisfied for which of
the following function?
(A) u(t)
(B) δ(t)
(C) Sin 2t
(D) Cos 2t
(E) Sin2t + Cos 2t
(F) None
Answer : [A] u(t)
