WorksheetsNT QUIZ
Total questions: 15
Worksheet time: 31mins
If the laplace transform of the voltage across a capacitor of value 1/2 F is Vc(S) = 1/S^2+1 the value of the current through the capacitor at t= 0+ is
0
2 A
1/2A
1A
The response of an initially relaxed linear constant parameter network to a unit impulse applied at t =0 is 4e^-2tu(t). The response of this network to a unit step function will be
2(1- e^-2t) u(t)
4(e^-t - e^-2t) u(t)
Sin2t
(1- 4e^-4t) u(t)
The Laplace transform of a unit ramp function starting at t=a is
1/(s+a)^2
e^ -as/(s+a)^2
e^-as/s^2
a/s^2
The Laplace transform of
e^at Cosbt is equal to
(S-a)/(S-a)^2+b^2
(S+a)/(S-a)^2+b^2
1/(S-b)^2
none of the above
A current impulse input of magnitude 5 is forced through a capacitor C. The voltage Vc(t) across the capacitor is given by
5t
5 u(t) - C
(5/C) t
5 u(t) / C
When a unit impulse voltage is applied to an inductor of 1 H, the energy supplied by the source is
Infinite
1 J
1/2 J
0
As the poles of a network shift away from the x axis, the response
remains constant
becomes less oscillating
becomes more oscillating
None of these
A system is represented by the transfer function 10/ (S+1)(S+2). The DC gain of this system is
1
2
5
10
The value of time constant in RL circuit is given by
R/L
L/R
RL
1+RL
A step function voltage is applied to an RLC circuit having R = 2 ohm, L = 1H and C = 1 F . The transient current response of the circuit would be
Over damped
Critically damped
Under damped
None of these
The overall inductance of two coils connected in series, with mutual inductance aiding self inductance is L1; with mutual inductance opposing self inductance, the overall inductance is L2. The mutual inductance M is given by
L1+L2
L1 - L2
1/4(L1 - L2)
1/2( L1 +L2)
Two coupled coils connected in series have an equivalent inductance of 16 mph or 8 mph depending on the interconnection. Then the mutual inductance M between the coils is
12 mH
4 mH
11.3 mH
2 mH
Two coupled coils with L1=L2=0.6H have a coupling coefficient of k=0.8. The turns ratio N1/N2 is
4
2
1
0.5
The mutual inductance between two coupled coils is 10 mH. If the turns in one coil are doubled and that in the other are halved then the mutual inductance will be
5 mH
10 mH
14 mH
20 mH
The coupling between two magnetically coupled coils is said to be ideal if the coefficient of coupling is
Zero
0.5
2
1
