When a current source I is suddenly connected across a two terminal relaxed RC c

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Networks Analysis and Synthesis Comments

Question
When a current source I is suddenly connected across a two terminal relaxed RC circuit at time t = 0, the voltage across the current source is shown in figure. The RC circuit is
Options
A. a series combination of R and C
B. a parallel combination of R and C
C. a series combination of R and parallel combination of R and C
D. a pure capacitor

Correct Answer

a series combination of R and parallel combination of R and C

Explanation

Initially capacitor behaves as short-circuit and finally as open circuit.

Networks Analysis and Synthesis problems

Search Results

2. The current rating of a cable depends on
Options
A. length of cable
B. diameter of cable
C. both length and diameter of cable
D. none of the above

3. In the circuit of figure, the switch is closed at t = 0. At t = 0⁺ the current through C is
Options
A. 4 A
B. 2.5 A
C. 3.1 A
D. 0

4. In an RC series circuit R = 100 ? and X_C = 10 ?. In this circuit
Options
A. the current and voltage are in phase
B. the current leads the voltage by about 6�
C. the current leads the voltage by about 84�
D. the current lags the voltage by about 6�

5. A current is flowing through a conductor with non-uniform area of cross-section. Then
Options
A. current will be different at different cross-sections.
B. current will be the same at all the cross-sections.
C. current will be different but current density will be same at all the cross-sections
D. current will be the same but current density will be different at different cross-sections.

6. The electrical energy required to heat a bucket of water to a certain temperature is 2 kWh. If heat losses, are 25%, the energy input is
Options
A. 2.67 kWh
B. 3 kWh
C. 2.5 kWh
D. 3.5 kWh

7. The current wave shape shown in figure (1) is applied to a circuit element. The voltage across the element is shown in figure (2). The element is
Options
A. R
B. L
C. C
D. Semiconductor

8. In the figure shown, A₁, A₂, A₃ are identical Ammeters. If A₁ and A₃ read 5 and 13 A respectively, reading of A₂ will be
Options
A. 8
B. 13 A
C. 18
D. 12 A

9. In an R-C series circuit excited by a voltage E, the charge across capacitor at t = 0⁺ is
Options
A. 0
B. CE
C. CE (1 - e^-t/RC)
D. none of the above

10. A two branch parallel circuit has a 20 ? resistance and 1 H inductance in one branch and a 100 ?F capacitor in the second branch. It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is
Options
A. 500 ?
B. 50 ?
C. 20 ?
D. 5 ?

Comments

There are no comments.

More in Electronics and Communication Engineering: