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Electrical resonance

Total questions: 18

Worksheet time: 9mins

Name
Class
Date
1.

Resonance in general, occurs when

a)

the applied frequency is a maximum

b)

the applied frequency is greater than the natural frequency

c)

the applied frequency is equal to the natural frequency

d)

the applied frequency is less than the natural frequency

2.

A circuit is in resonance when

a)

the impedance is an maximum

b)

the impedance is zero

c)

the reactance is maximum

d)

the current is maximum

3.

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

a)

inductance and capacitance

b)

inductance resistance and capacitance

c)

resistance and capacitance

d)

inductance and resistance

4.

What is reactance?

a)

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

b)

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

c)

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

d)

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

5.

What is the reactance of an inductor?

a)

1/wL

b)

L/w

c)

wL

d)

w/L

6.

What is reactance of a capacitor?

a)

wC

b)

w/C

c)

C/w

d)

1/wC

7.

What is the unit for capacitative reactance?

a)

Farad

b)

Ohm

c)

Henry

d)

Ohm Farad

8.

What is impedance?

a)

resistance

b)

the sum of resistance and total reactance

c)

the vector sum of resistance and total reactance

d)

the sum of capacitative and inductive reactance

9.

What is the difference between impedance and reactance

a)

reactance depends on frequency but impedance does not

b)

reactance involves resistance as well, but impedance does not

c)

impedance is the vector sum of resistance and reactance

d)

there is no difference

10.

What are the symbols for impedance, reactance and resistance?

a)

X, Z, R

b)

X, Y, R

c)

Z, X, R

d)

Z, R, X

11.

Which phasor is ahead of which?

a)

inductor voltage is ahead of capacitor voltage which is ahead of resistor voltage

b)

capacitor voltage is ahead of resistor voltage which is ahead of inductor voltage

c)

capacitor voltage is ahead of inductor voltage which is ahead of resistor voltage

d)

inductor voltage is ahead of resistor voltage which is ahead of capacitor voltage

12.

Which phasor is ahead of which?

a)

inductor reactance is ahead of resistance which is ahead of capacitive reactance

b)

capacitive reactance is ahead of inductive reactance which is ahead of resistance

c)

inductive reactance is ahead of capacitative reactance which is ahead of resistance

d)

capacitor reactance is ahead of resistance which is ahead of inductor reactance

13.

What is the formula for finding impedance?

a)

(R2 (wL 1wC)2)\sqrt{\left(R^2\ -\ \left(wL\ -\ \frac{1}{wC}\right)^2\right)}

b)


(R2 + (wL 1wC)2)\sqrt{\left(R^2\ +\ \left(wL\ -\ \frac{1}{wC}\right)^2\right)}

c)

(R2 + (wL + 1wC)2)\sqrt{\left(R^2\ +\ \left(wL\ +\ \frac{1}{wC}\right)^2\right)}

d)

(R2 (wL + 1wC)2)\sqrt{\left(R^2\ -\ \left(wL\ +\ \frac{1}{wC}\right)^2\right)}

14.

An LRC resonates when the applied frequency is equal to

a)

 LC\sqrt{LC}  

b)

 1LC\frac{1}{\sqrt{LC}}  

c)

 2πLC\frac{2\pi}{\sqrt{LC}}  

d)

 12πLC\frac{1}{2\pi\sqrt{LC}}  

15.

Current in an LRC circuit is

a)

in phase with VR

b)

in phase with Vs

c)

in phase with VL

d)

in phase with Vc

16.

If the inductive reactance is smaller than the capacitive reactance, then the current

a)

lags the supply voltage

b)

leads the supply voltage

c)

is in phase with the supply voltage

d)

leads the resistor voltage

17.

if the inductive reactance is less than the capacitive reactance then the circuit will move into resonance if

a)

the inductance is decreased

b)

capacitance decreased

c)

capacitance is increased

d)

the frequency is decreased

18.

if the inductive reactance is less than the capacitative reactance, the circuit will move into resonance if

a)

the overlapping area of the plates increases

b)

the distance between the plates increases

c)

the overlapping area of the plates decreases

d)

the dielectric between the plates decreases