Elec 05-01 to Elec 05-05 TransReso

Transient disturbance is produced in a circuit whenever

• It is suddenly connected or disconnected from the supply
• It is shorted
• Its applied voltage is changed suddenly
• all of the choices

To double the resonant frequency of an LC circuit with a fixed value of L, the capacitance, C, must be

• doubled
• quadrupled
• reduced by one-half
• reduced by one-quarter

After two-time constants, the capacitor in an RC circuit is charged to what percentage of the supply voltage?

• 0.368
• 0.865
• 0.632
• 0.95

In an R-L circuit connected to an alternating sinusoidal voltage, size of transient current primarily depends on

• the instant in the voltage cycle at which circuit is closed
• the peak value of steady-state current
• the circuit impedance
• the voltage frequency

The resonant frequency of an LC circuit is the frequency where

• XL = 0 Ohm and XC = 0 Ohm
• XL = XC
• XL and rs of the coil are equal.
• XL and Xc are in phase

What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the supply voltage?

• An exponential rate of one
• One time constant
• One exponential period
• A time factor of one

A higher Q for a resonant circuit provides a

• dampened response curve
• wider bandwidth
• narrower bandwidth
• None of the above

In a low Q parallel resonant circuit, when XL = X

• IL = IC
• IL is less than IC
• IC is less than IL
• IL is more than IC

What will happen to a parallel accircuit if its line frequency is more than the resonant frequency?

• Becomes purely resistive
• Becomes purely capacitive
• Becomes inductive
• Becomes capacitive

Below resonance, a series LC circuit appears

• inductive
• resistive
• capacitive
• None of the above