Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-12
166. Which of the following expression is correct for series reactance Xcs if three capacitors C1, C2 and C3 are connected in series?
a) 1/Xcs = 1/Xc1 + 1/Xc2 + 1/Xc3
b) Xcs = Xc1 + Xc2 + Xc3
c) Xcs = 1/Xc1 + 1/Xc2 + 1/Xc3
d) Xcs = 1/Xc1 + Xc2+ Xc3
Ans: (b)
a) ES = ER
b) ES+ EC
c) ER=0.707 EC
d) ER= 0.707 ES
Ans: (d)
a) 1/s
b) 1/s2
c) S
d) 1
Ans: (a)
a) 1/a2+ s2
b) 1/a+s
c) 1/a+s
d) s2/a2+ s2
Ans: (b)
a) β/s2+β2
b) s/s2+β2
c) 1/2+β2
d) β/s+β
Ans: (b)
a) β/s+β2
b) β/s2+β2
c) s/s2+β2
d) β2/s+β
Ans: (a)
a) 1/s
b) 1/s2
c) 1/s3
d) S
Ans: (a)
a) ƒ(t) = tn
b) ƒ(t) = ntn
c) ƒ(t) = t/n
d) ƒ(t) = tn
Ans: (a)
Line s F(s) = line ƒ(t)
s →∞ t → 0
a) ƒ(t) and its derivative ƒ(t) must have Laplace transformer
b) if the Laplace transform of ƒ(t) is F(s), the lim sF(s) must exist
c) only ƒ(t) must have Laplace transformer
d) (a) and (b) both
Ans: (d)
a) S
b) 1/s
c) Unity
d) 1/s2
Ans: (c)
a) One
b) Two
c) Three
d) None
Ans: (a)
a) One pole will be located on the real axis of s-plane at – α
b) One pole will be located on the imaginary axis of s-plane at ± ϳω
c) One complex pole will be located at the origin of s-plane
d) One complex pole will be located in s-plane at – α ± јω
Ans: (a)
a) ƒ(t) = t
b) ƒ(t) = 1
c) ƒ(t) = δt
d) ƒ(t) = 2t
e) ƒ(t) = t2
Ans: (e)
a) integrate unit impulse function once
b) integrate unit impulse function twice
c) integrate unit impulse function thrice
d) differentiate unit impulse function twice
e) differentiate unit impulse once as a function of time
Ans: (c)
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