Bissoy.com
Doctors Medicines MCQs Q&A

In the circuit as shown in figure, the switch is closed at t = 0. The current through the capacitor will decrease exponentially with a time constant of magnitude

In the circuit as shown in figure, the switch is closed at t = 0. The current through the capacitor will decrease exponentially with a time constant of magnitude Correct Answer 1 s

Concept:

Time constant of a circuit is the time taken to rise the 63.2% of input voltage.

Time constant of R-L circuit (τ) = L/R

Time constant of R-C circuit (τ) = RC

Calculation:

After t = 0, the circuit diagram becomes as shown below

[ alt="F1 U.B. Nita 29.10.2019 D29" src="//storage.googleapis.com/tb-img/production/19/10/F1_U.B._Nita_29.10.2019_D29.png" style="width: 207px; height: 128px;">

Equivalent resistance (R) is the equivalent resistance across capacitor terminals by replacing all the independent voltage sources with short circuit and all the independent current sources with open circuit.

Now, the circuit becomes as shown below

[ alt="F1 U.B. Nita 29.10.2019 D28" src="//storage.googleapis.com/tb-img/production/19/10/F1_U.B._Nita_29.10.2019_D28.png" style="width: 180px; height: 132px;">

Now, equivalent resistance (R) = 1 Ω

Capacitance (C) = 1 F

Time constant (τ) = RC = 1 s

Related Questions

The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If the maximum number of valves that can be closed at the same time are closed which of the following must true?
You need to allow one host to be permitted to attach dynamically to each switch interface. Which two commands must you configure on your catalyst switch to meet this policy?
1. Switch (config-if) # ip access-group 10
2. Switch (config-if) # switchport port-security maximum 1
3. Switch (config) # access-list 10 permit ip host 1
4. Switch (config-if) # switchport port-security violation shutdown
5. Switch (config) # mac-address-table secure
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If R is closed and U is open, which of the following must be true?
The figure shows a constant current source charging a capacitor that is initially uncharged.
Electromagnetic Theory mcq question image
If the switch is closed at t = 0, which of the following plots depicts correctly the output voltage of the circuit as a function of time?
Which one of the following sets is incorrect to show the inter-relationships among price elasticity coefficient, change in price and change in total revenue ? Price elasticity coefficient Change in price Change in Total Revenue 1) Zero Increase Decrease Increase Decrease (2) Less than 1 Increase Decrease Decrease Increase (3) Equal to 1 Increase Decrease No change No change (4) More than 1 Increase Decrease Decrease Increase  
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If Z is open, which of the following must be true?
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. Which of the following, if given to the mixing vat operator as an instruction, would not determine the setting of any other valve ?
For the circuit as shown, consider that switch S1 has been in position B for a very long time and switch S2 has been open all the time. At time t = 0, the switch S1 moves to position A and switch S2 closes instantaneously. What is the value of Vout of t = 0+, assuming initial charge on C = 0?
A diode circuit is so arranged that when the switch is open it’s KVL gives Ri+ 1/C ∫i dt = 0 When the switch is closed, Ri+ 1/C ∫i dt = Vs Vs is the dc supply voltage. The diode is so connected that it is forward biased when switch is closed The circuit is mostly likely be a
A circuit is so formed such that source-R-L-diode-switch are all in series. Consider the initial current in L to be zero. The diode is so connected that it is forward biased when switch is closed. When the switch is closed,