# ECA - Assignment - III (11-02-2021)

## Quiz by NAGA RAJU ELURI

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20 questions
• Q1
Inverse Laplace transform of F(s) = (5s+1)/(s2-25) is
cos5t+1/5sin5t
5cosh5t+1/5sinh5t
5cos5t+1/5sin5t
5cosh5t+sinh5t
60s
• Q2
Laplace transform of function f(t) = eatsin(wt) is
w/((s-a)2+w2)
s/((s-a)2+w2)
(s-a)/((s-a)2+w)
(s-a)/(s-a)+w
60s
• Q3
Laplace transform of an impulse response is regarded as _____function of the system
Transfer
Hypothetical
Parabolic
Analytic
60s
• Q4
By equating the denominator of transfer function to zero, which among the following will be obtained?
Both a and b
Poles
None of the above
Zeros
60s
• Q5
The transfer function of a system is defined as the ratio of its output to input in
Fourier transform
Both (a) and (b)
Laplace transform
Z-transform
60s
• Q6
Mutually inductance between two magnetically coupled coils depends on
permeability of core
cross sectional area of their common core
All of above
the number of their turns
60s
• Q7
What is the Value of Leq=?
2 H
4H
8H
6H
60s
• Q8
The direction of induced emf can be found by
Lenz's law
Laplace's law
Voltage law
Fleming's right hand rule
60s
• Q9
Refer to the two magnetically coupled coils of Fig.(a). The polarity of the mutual voltage is
a and b
a or b
Negative
Positive
60s
• Q10
The coefficient of coupling for two coils having L1 = 2 H, L2 = 8 H, M = 3 H is
.0.75
5.333
0.1875
1.333
60s
• Q11
Mutual inductance between two coupled coils depend on?
Rate of change of current
Rate of change of flux linkage
Flux density
60s
• Q12
What is the coupling coefficient when all the flux of coil 1 links with coil 2?
1
0
100
Insufficient information provided
60s
• Q13
The working principle of transformer depends on
Ampere's law.
Coulomb's law.
Newton's law.
60s
• Q14
Two coupled coils with L1=L2=0.6 H have a coupling coefficient of K = 0.8. The turns ratio N1/N2 is
2
4
1
0.5
60s
• Q15
Number of possible combination generated by four variables taken two at a time in a two-port network is
5
6
2
4
60s

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