Time constant of an inductive circuit
A. Increases with increase of inductance and decrease of resistance
B. Increases with the increase of inductance and the increase of resistance
C. Increases with the decrease of inductance and decrease of resistance
D. Increases with decrease of inductance and increase of resistance
Answer: Option A
Solution (By Examveda Team)
Time constant (τ) of an inductive circuit is defined as the time required for the current to reach approximately 63.2% of its final steady value after a sudden change in voltage.The formula for the time constant in an RL (Resistor–Inductor) circuit is:
τ = L / R
Where:
L = Inductance in Henry (H)
R = Resistance in Ohms (Ω)
From the formula, we can see that:
1. If inductance (L) increases, the time constant increases.
2. If resistance (R) decreases, the time constant increases.
Therefore, the time constant increases with increase of inductance and decrease of resistance.
Correct Answer: Option A
This Question Belongs to Electrical Engineering >> A.C Fundamentals, Circuits And Circuit Theory
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Comments (1)
Which of the following refers to a parallel circuit?
A. The current through each element is same
B. The voltage across element is in proportion to it's resistance value
C. The equivalent resistance is greater than any one of the resistors
D. The current through any one element is less than the source current
A. Apparent power is more than actual power
B. Reactive power is more than apparent power
C. Actual power is more than reactive power
D. Reactive power is more than actual power
The transient currents are associated with the
A. Changes in the stored energy in the inductors and capacitors
B. Impedance of the circuit
C. Applied voltage to the circuit
D. Resistance of the circuit
The inductance of a coil can be increased by
A. Increasing core length
B. Decreasing the number of turns
C. Decreasing the diameter of the former
D. Choosing core material having high relative permeability
The time constant is calculated using the formula: τ = L/R, where L is the inductance in Henries and R is the resistance in Ohms.