EE 125 - MIDTERM EXAM

Resonance in general, occurs when

• the applied frequency is a maximum

• the applied frequency is greater than the natural frequency

• the applied frequency is equal to the natural frequency

• the applied frequency is less than the natural frequency

A circuit is in resonance when

• the impedance is an maximum

• the impedance is zero

• the reactance is maximum

• the current is maximum

An LRC circuit has a "natural frequency" which is dependent on ...

• inductance and capacitance

• inductance resistance and capacitance

• resistance and capacitance

• inductance and resistance

What is reactance?

• a measure of how much a capacitor or an inductor, increases a changing current

• a measure of how much a capacitor or an inductor, restricts a current

• a measure of how much a capacitor or an inductor, converts a changing current to heat

• a measure of how much a capacitor or an inductor, restricts a changing current

What is the reactance of an inductor?

• 1/wL

• L/w

• wL

• w/L

What is reactance of a capacitor?

• wC

• w/C

• C/w

• 1/wC

What is the unit for capacitative reactance?

• Farad

• Ohm

• Henry

• Ohm Farad

What is impedance?

• resistance

• the sum of resistance and total reactance

• the vector sum of resistance and total reactance

• the sum of capacitative and inductive reactance

What is the difference between impedance and reactance

• reactance depends on frequency but impedance does not

• reactance involves resistance as well, but impedance does not

• impedance is the vector sum of resistance and reactance

• there is no difference

What are the symbols for impedance, reactance and resistance?

• X, Z, R

• X, Y, R

• Z, X, R

• Z, R, X