CIRCUIT TRANSIENT POWERLINE

premopremo remo · 75問 · 2年前

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問題一覧

At a dc steady state, capacitor looks like a/ an _____________ circuit I. Grounded II. Short III. Open

III and II

The time constant of an inductive circuit is defined as the ratio of

L/R

A coil of inductance 15 H is connected to a source voltage of V=6t^1/2 + 28.5. If the initial current is 15 ampere, what is the current in the inductor after 2.5 sec?

20.8 A

A relay has 12 ohms resistance and a 2.4 H inductance is suddenly switched across 120 volts supply of negligible internal resistance. Determine the transient current equation.

10(1-e^-5t) Amp

A shunt winding of a machine has a resistance of 80 ohms and inductance of 4 H. It is switched siddenly on to 220 V dc supply. The time taken for current to rise to half its final steady value is nearest to

0.035 sec

The time constant is the time its takes the current in an inductive circuit to rise to

63% of its final steady state value

A series RC circuit contains a 4 ohms resistor and an uncharged 300 micro F capacitor. The switch is closed at t=0 connecting the circuit across 500 volts source. What is the transient current as function of time?

125e^-833t

In an RC circuit connected across dc source, which of the following is zero at the begging of trasient stage?

capacitor voltage

A capacitor having a capacitance of 30 uF is connectedacross 200 Vdc source. The charging current will be least?

When capacitor is fully charged

The time constant of a RC circuit is defined as the time during which capacitor charging current becomes __________ percent of its _________ value

37, initial

A capacitor of 200 uf is connected in series with a resistance of 100 ohms. The time constant of the circuit is

0.02 second

* A series RC cricuit with 2 kilo ohms resistor and variable capacitor is suddenly connected to a DC supply. Find the Value of capacitor in microfarad if the required time constant is 10 ms

* A certain capacitor, in series with a resistor, is being charged. At the end of 10 ms its charge is half the final value. What is the time constant on this process in ms?

* A certain precision 1 micro farad capacitor has a very high resistance material used between its conducting surfaces. The capacitor is charged to 1 volt at t=0 and disconnected from the source. It is found that the voltage drops to 0.9 volt in 100 hour. Find the insulation resistance of the capacitor.

3420 G ohm

In discharging a capacitor, to what value will the initial voltage Vo of the capacitor decay over a period of one time constant?

0.368 Vo

A series RLC with R2= 2 ohm and L = 0.5 H. Find the value of capacitance so that the circuit is critically damped.

0.5 F

The transients current in a loss free LC circuit when excited from an ac source is a/an ___________ sine wave

undamped

A charge capacitor and inductor are connected in series. at time t=0 the current is zero, but the capacitor is charged. If T is the period of the resulting oscillations, the next time after t=0 that the voltage across the inductor is maximum is

T/2

A 2 H inductor, 16 ohms resistor and 0.02 F capacitor is suddenly connected to a 300 volts. Find the transient current when the switch is closed at t=0

50 e^-4t sin 3t

The growth of the current through circuit follows

Exponential law

The rate of rise of current through an indictive coil in maximum

at the start of current flow

Calculate the growth of current at the instant completing circuit

4 Amp/sec

aa capacitor has an initial charge 8.3 coulomb. If the current flows through it is given by the equation i=2t +3 amperes. find the charge when t=1 sec

12.3

A coil inductance 25 H with inital current of 1 ampere is suddenly connected to a source voltage of V=8?9+(3t)^1/2 volts. What is the current in the inductor after 5 sec?

3.329 A

A coil of 15 H inductance and 10 ohms resistance is suddenly connected to a 20 volts DC source by closing switch. The energy stored in the magnetic in the magnetic field 2 seconds after the switch is closed is

16.3 joules

Find the voltages across a 0.01 micro farad capacitor at t=0.25 micro second if V(0)= 0.6 volts and the current through it is 0.2 sin 2π 10^6 t amperes

3.78 volts

What is the time constant of a coil having 10 ohms resistance and 100 mH inductance?

10 ms

The decay has a resistance of 300 ohns and is switched on to a 110 volts dc source. If the current reached 63.2% of its final steady value in 0.002 sec, What is the inductance of the circuit?

0.6 H

a 240 V dc generator supplies current to a parallel circuit consisting of a resistor 600 ohm and a coil with resistance 300 ohm and inductance 200 H. The system is at steady state. Determine the transient current equation

0.8e^-4.5t A

A capacitance C is charged through resistance R. the time constant of the charging circuit is given by.

1/RC

A 100 micro farad capacitor carrying an initial charge of 500 micro coulomb, is discharge through a 50 ohm resistor. Determine the time takes the capacitor to discharged to 184 micro coulomb charge

123

A series circuit of resistance of 3000 ohms and a capacitor 0.01 micro farad is suddenly connected to a 100 volts battery. The capacitor has an inital stored voltage of 40 volts. at this instant, at what rate is the voltage Vc changing?

2×10^6 volts/sec

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