Question 1

A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0  $\Omega$  and C = 300 $\mu$F.The peak current in the circuit is:

Accepted Answer

A) 8.24 A. 
B) 8.84 A. 
C) 11.0 A. 
D) 12.4 A. 
E) 23.5 A. 
A) 8.24 A. 
B) 8.84 A. 
C) 11.0 A. 
D) 12.4 A. 
E) 23.5 A.

Question 2

The impedance of the parallel RLC circuit shown is given by:

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 3

Determine the resonant frequency of the circuit.

Accepted Answer

A) 159 Hz 
B) 32 Hz 
C) 5 Hz 
D) 500 Hz 
E) 79.5 Hz 
A) 159 Hz 
B) 32 Hz 
C) 5 Hz 
D) 500 Hz 
E) 79.5 Hz

Question 4

The graphs below represent current and voltage phasors at one instant of time.The solid arrows represent the voltage phasors, $\Delta$Vmax, and the dashed arrows represent the current phasors, Imax.The graph which shows the correct relationship between current and voltage phasors for a capacitor in an RC circuit is:

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 5

Determine the rms voltage for the circuit.

Accepted Answer

A) 99 V (rms) 
B) 140 V (rms) 
C) 196 V (rms) 
D) 70 V (rms) 
E) 110 V (rms) 
A) 99 V (rms) 
B) 140 V (rms) 
C) 196 V (rms) 
D) 70 V (rms) 
E) 110 V (rms)

Question 6

In a parallel RLC circuit, where IR = IR, max sin($ \omega $t), the current through the capacitor, IC, is:

Accepted Answer

A) IC = -IC, max sin($ \omega $t). 
B) IC = IC, max sin($ \omega $t). 
C) IC = -IC, max cos($ \omega $t). 
D) IC = IC, max cos($ \omega $t). 
E) IC = IC, max tan($ \omega $t). 
A) IC = -IC, max sin($ \omega $t). 
B) IC = IC, max sin($ \omega $t). 
C) IC = -IC, max cos($ \omega $t). 
D) IC = IC, max cos($ \omega $t). 
E) IC = IC, max tan($ \omega $t).

Question 7

An ac power generator produces 50 A (rms) at 3600 V.The voltage is stepped up to 100 000 V by an ideal transformer and the energy is transmitted through a long distance power line which has a resistance of 100 ohms.What percentage of the power delivered by the generator is dissipated as heat in the long-distance power line?

Accepted Answer

The answer of An ac power generator produces 50 A...

Question 8

All three circuits shown below have R = 100 $\Omega$ , L = 0.1 H and emf $\varepsilon$= (5.0 V) sin (377 t).Which statement regarding the angular resonance frequencies $ \omega $A, $ \omega $B and $ \omega $C is correct?

Accepted Answer

A) $ \omega $C > $ \omega $A =$ \omega $
B)  
B) ($ \omega $C  $ \omega $A = $ \omega $
C)  
A) $ \omega $C > $ \omega $A =$ \omega $
B)  
B) ($ \omega $C  $ \omega $A = $ \omega $
C)

Question 9

A high-voltage powerline operates at 500 000 V-rms and carries an rms current of 500 A.If the resistance of the cable is 0.050 $\Omega$ /km, what is the resistive power loss in 200 km of the powerline?

Accepted Answer

A) 250 kW 
B) 500 kW 
C) 1 Megawatt 
D) 2.5 Megawatts 
E) 250 Megawatts 
A) 250 kW 
B) 500 kW 
C) 1 Megawatt 
D) 2.5 Megawatts 
E) 250 Megawatts

Question 10

A transformer is to be designed to increase the 30 kV-rms output of a generator to the transmission-line voltage of 345 kV-rms.If the primary winding has 80 turns, how many turns must the secondary have?

Accepted Answer

A) 6 
B) 70 
C) 920 
D) 9200 
E) 12 
A) 6 
B) 70 
C) 920 
D) 9200 
E) 12

Question 11

Determine the rms current for the circuit.

Accepted Answer

A) 55 mA 
B) 77 mA 
C) 99 mA 
D) 0.19 A 
E) 61 mA 
A) 55 mA 
B) 77 mA 
C) 99 mA 
D) 0.19 A 
E) 61 mA

Question 12

A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100 $\Omega$.What is the average power loss?

Accepted Answer

A) 225 W 
B) 450 W 
C) 980 W 
D) 1.12 kW 
E) 900 W 
A) 225 W 
B) 450 W 
C) 980 W 
D) 1.12 kW 
E) 900 W

Question 13

Inductive reactance XL is given by:

Accepted Answer

A) L$ \omega $ 
B) L/$ \omega $ 
C) 1/L$ \omega $ 
D) ($ \omega $/L) 
E) ($ \omega $2L) 
A) L$ \omega $ 
B) L/$ \omega $ 
C) 1/L$ \omega $ 
D) ($ \omega $/L) 
E) ($ \omega $2L)

Question 14

If the input to an RLC series circuit is V = Vm cos $ \omega $t, then the current in the circuit is:

Accepted Answer

A) cos$ \omega $t   
B)    
C)    
D)    
E)    
A) cos$ \omega $t   
B)    
C)    
D)    
E)

Question 15

A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0  $\Omega$  and C = 300 $\mu$F.The power factor, cos $\phi$, is:

Accepted Answer

A) (-1.00.) 
B) (-0.749.) 
C) +0.749. 
D) +0.834. 
E) +1.00. 
A) (-1.00.) 
B) (-0.749.) 
C) +0.749. 
D) +0.834. 
E) +1.00.

Question 16

The graphs below show the phasors $\Delta$Vmax and Imax for five RLC series circuits.The solid arrows represent the voltage phasors, $\Delta$V, and the dashed arrows represent the current phasors, Imax.The graph which represents a circuit where the inductive reactance is greater than the capacitive reactance is:

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 17

At what frequency will a 50.0-mH inductor have a reactance XL = 700 $\Omega$?

Accepted Answer

A) 352 Hz 
B) 777 Hz 
C) 1.25 kHz 
D) 2.23 kHz 
E) 14 kHz 
A) 352 Hz 
B) 777 Hz 
C) 1.25 kHz 
D) 2.23 kHz 
E) 14 kHz

Question 18

Determine the rms voltage drop across the resistor in the circuit.

Accepted Answer

A) 55 V 
B) 77 V 
C) 9.9 V 
D) 5.5 V 
E) 61 V 
A) 55 V 
B) 77 V 
C) 9.9 V 
D) 5.5 V 
E) 61 V

Question 19

A 10-$\mu$F capacitor in an LC circuit made entirely of superconducting materials (R = 0  $\Omega$  ) is charged to 100 $\mu$C.Then a superconducting switch is closed.At t = 0 s, plate 1 is positively charged and plate 2 is negatively charged.At a later time, Vab = +10 V.At that time, Vdc is:

Accepted Answer

A) 0 V. 
B) 3.54 V. 
C) 5.0 V. 
D) 7.07 V. 
E) 10 V. 
A) 0 V. 
B) 3.54 V. 
C) 5.0 V. 
D) 7.07 V. 
E) 10 V.

Question 20

Determine the rms voltage drop across the capacitor in the circuit.

Accepted Answer

A) 55 V 
B) 77 V 
C) 110 V 
D) 154 V 
E) 198 V 
A) 55 V 
B) 77 V 
C) 110 V 
D) 154 V 
E) 198 V

A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 $\Omega$ and C = 300 $\mu$ F.The peak current in the circuit is:

The impedance of the parallel RLC circuit shown is given by:

Determine the resonant frequency of the circuit.

Determine the rms voltage for the circuit.

In a parallel RLC circuit, where IR = IR, max sin( $\omega$ t), the current through the capacitor, IC, is:

A high-voltage powerline operates at 500 000 V-rms and carries an rms current of 500 A.If the resistance of the cable is 0.050 $\Omega$ /km, what is the resistive power loss in 200 km of the powerline?

A transformer is to be designed to increase the 30 kV-rms output of a generator to the transmission-line voltage of 345 kV-rms.If the primary winding has 80 turns, how many turns must the secondary have?

Determine the rms current for the circuit.

A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100 $\Omega$ .What is the average power loss?

Inductive reactance XL is given by:

If the input to an RLC series circuit is V = Vm cos $\omega$ t, then the current in the circuit is:

A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 $\Omega$ and C = 300 $\mu$ F.The power factor, cos $\phi$ , is:

At what frequency will a 50.0-mH inductor have a reactance XL = 700 $\Omega$ ?

Determine the rms voltage drop across the resistor in the circuit.

Determine the rms voltage drop across the capacitor in the circuit.

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Quantum Physics of Molecules and Solids

Nuclei and Radioactivity

Particle Physics

Filters

Exam 11: Alternating-Current Circuits

A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 Ω\OmegaΩ and C = 300 μ\muμ F.The peak current in the circuit is:

The impedance of the parallel RLC circuit shown is given by:

Determine the resonant frequency of the circuit.

Determine the rms voltage for the circuit.

In a parallel RLC circuit, where IR = IR, max sin( ω \omega ω t), the current through the capacitor, IC, is:

All three circuits shown below have R = 100 Ω\OmegaΩ , L = 0.1 H and emf ε\varepsilonε = (5.0 V) sin (377 t).Which statement regarding the angular resonance frequencies ω \omega ω A, ω \omega ω B and ω \omega ω C is correct?

A high-voltage powerline operates at 500 000 V-rms and carries an rms current of 500 A.If the resistance of the cable is 0.050 Ω\OmegaΩ /km, what is the resistive power loss in 200 km of the powerline?

A transformer is to be designed to increase the 30 kV-rms output of a generator to the transmission-line voltage of 345 kV-rms.If the primary winding has 80 turns, how many turns must the secondary have?

Determine the rms current for the circuit.

A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100 Ω\OmegaΩ .What is the average power loss?

Inductive reactance XL is given by:

If the input to an RLC series circuit is V = Vm cos ω \omega ω t, then the current in the circuit is:

A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 Ω\OmegaΩ and C = 300 μ\muμ F.The power factor, cos ϕ\phiϕ , is:

At what frequency will a 50.0-mH inductor have a reactance XL = 700 Ω\OmegaΩ ?

Determine the rms voltage drop across the resistor in the circuit.

Determine the rms voltage drop across the capacitor in the circuit.

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Quantum Physics of Molecules and Solids

Nuclei and Radioactivity

Particle Physics

Filters

A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 $\Omega$ and C = 300 $\mu$ F.The peak current in the circuit is:

In a parallel RLC circuit, where IR = IR, max sin( $\omega$ t), the current through the capacitor, IC, is:

A high-voltage powerline operates at 500 000 V-rms and carries an rms current of 500 A.If the resistance of the cable is 0.050 $\Omega$ /km, what is the resistive power loss in 200 km of the powerline?

A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100 $\Omega$ .What is the average power loss?

If the input to an RLC series circuit is V = Vm cos $\omega$ t, then the current in the circuit is:

A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 $\Omega$ and C = 300 $\mu$ F.The power factor, cos $\phi$ , is:

At what frequency will a 50.0-mH inductor have a reactance XL = 700 $\Omega$ ?