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Electrical Engineering Questions and Solutions Set 1

Electrical Engineering Questions and Solutions Set 1
Question:-
Option (A)
high pass filter
Option (B)
all pass filter
Option (C)
band stop filter
Option (D)
low pass filter
Correct Option:
D
Question Solution:
At very low frequency or ω = 0
Capacitor acts as open circuit and inductor acts as short circuit

=>   Input is equal to output
at very high frequency or ω = ∞

=>   Zero output
Capacitor acts as short circuit and inductor acts as open circuit.
Question:-
Option (A)
-2 A/sec
Option (B)
-3 A/sec
Option (C)
-1 A/sec
Option (D)
0 A/sec
Correct Option:
C
Question Solution:
When S is open, t = 0-, inductor acts as short circuit iL(0-) = 1 A.
As the inductor does not allow the change of current
iL(0+) = iL(0-) = 1 A
at t = 0+

So, att = 0+,
Vc = 0
VR + VL = Vc = 0
=> VL = -VR = -iL(0+) x 1
= -1 × 1 = -1 V
VL =
=> = -1 V
=> = -1 A/sec.
Question:-
Option (A)
21.8 ∠26.92° Ω
Option (B)
26.92∠21.8° Ω
Option (C)
25∠10° Ω
Option (D)
10 ∠25° Ω
Correct Option:
B
Question Solution:
v = vo - vc(vectorial subtraction)
I = = 0.2∠60° A
Z =
= 26.92∠21.8° Ω
Question:-
Option (A)
e-2tu(t)
Option (B)

Option (C)
2e-tu(t)
Option (D)
e-tu(t)
Correct Option:
A
Question Solution:
Transfer function =
givenC(t) = te-2tu(t)
=> C(s) =
= transfer function =
R(s) = C(s) . (s + 2)
= =
r(t) =