Question 1

A series RCL circuit is comprised of a 3.00-mH inductor and a 5.00-µF capacitor. What is the resonant frequency of this circuit?

Accepted Answer

A) 11.9 Hz 
B) 69.4 Hz 
C) 1.06 × 102 Hz 
D) 8.27 × 102 Hz 
E) 1.30 × 103 Hz 
A) 11.9 Hz 
B) 69.4 Hz 
C) 1.06 × 102 Hz 
D) 8.27 × 102 Hz 
E) 1.30 × 103 Hz

Question 2

Which one of the following materials would be in an n-type semiconductor?

Accepted Answer

A) silicon doped with boron 
B) silicon doped with gallium 
C) germanium doped with boron 
D) silicon doped with phosphorus 
E) germanium doped with gallium 
A) silicon doped with boron 
B) silicon doped with gallium 
C) germanium doped with boron 
D) silicon doped with phosphorus 
E) germanium doped with gallium

Question 3

When the frequency of an ac circuit is increased at constant voltage, the current increases and then decreases. Which combination of elements is most likely to comprise this circuit?

Accepted Answer

A) resistors only 
B) inductors only 
C) capacitors only 
D) a combination of inductors and resistors 
E) a combination of inductors and capacitors 
A) resistors only 
B) inductors only 
C) capacitors only 
D) a combination of inductors and resistors 
E) a combination of inductors and capacitors

Question 4

A 14.0-µF capacitor and a 1480-$\varOmega$ resistor are connected in series to a generator operating at 50.0 Hz and producing an rms voltage of 208 V. What is the average power dissipated in this circuit?

Accepted Answer

A) 190 W 
B) 28.9 W 
C) 19.7 W 
D) 4.18 W 
E) zero watts 
A) 190 W 
B) 28.9 W 
C) 19.7 W 
D) 4.18 W 
E) zero watts

Question 5

Complete the following statement: The main difference between an npn transistor and a pnp transistor is that

Accepted Answer

A) the bias voltages are reversed. 
B) they are made from different materials. 
C) one is a bipolar transistor and the other is not. 
D) one conducts electricity and the other does not. 
E) the current directions are the same while the voltages are reversed. 
A) the bias voltages are reversed. 
B) they are made from different materials. 
C) one is a bipolar transistor and the other is not. 
D) one conducts electricity and the other does not. 
E) the current directions are the same while the voltages are reversed.

Question 6

An ac generator supplies a peak (not rms) voltage of 150 V at 60.0 Hz. The generator is connected in series with a 35-mH inductor, a 45-µF capacitor and an 85-$\varOmega$ resistor.
-What is the capacitive reactance for this circuit?

Accepted Answer

A) 59 $\varOmega$ 
B) 85 $\varOmega$ 
C) 99 $\varOmega$ 
D) 120 $\varOmega$ 
E) 310 $\varOmega$ 
A) 59 $\varOmega$ 
B) 85 $\varOmega$ 
C) 99 $\varOmega$ 
D) 120 $\varOmega$ 
E) 310 $\varOmega$

Question 7

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300-$\varOmega$ resistor.
-What is the capacitive reactance?

Accepted Answer

A) 150 $\varOmega$ 
B) 190 $\varOmega$ 
C) 360 $\varOmega$ 
D) 390 $\varOmega$ 
E) 440 $\varOmega$ 
A) 150 $\varOmega$ 
B) 190 $\varOmega$ 
C) 360 $\varOmega$ 
D) 390 $\varOmega$ 
E) 440 $\varOmega$

Question 8

Which one of the following graphs illustrates how capacitive reactance varies with frequency?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) e 
A) a 
B) b 
C) c 
D) d 
E) e

Question 9

The graph shows the voltage across and the current through a single circuit element connected to an ac generator.  
-Identify the circuit element.

Accepted Answer

A) The element is a 25-$\varOmega$ resistor. 
B) The element is a 35-$\varOmega$ resistor. 
C) The element is a 0.45-H inductor. 
D) The element is a 360-µF capacitor. 
E) The element is a 510-µF capacitor. 
A) The element is a 25-$\varOmega$ resistor. 
B) The element is a 35-$\varOmega$ resistor. 
C) The element is a 0.45-H inductor. 
D) The element is a 360-µF capacitor. 
E) The element is a 510-µF capacitor.

Question 10

A series RCL circuit operating at 60.0 Hz contains a 49-$\varOmega$ resistor and an 5.0-µF capacitor. If the power factor of the circuit is +1.00, what is the inductance of the inductor in this circuit?

Accepted Answer

A) 0.86 H 
B) 1.4 H 
C) 2.3 H 
D) 57 H 
E) 320 H 
A) 0.86 H 
B) 1.4 H 
C) 2.3 H 
D) 57 H 
E) 320 H

Question 11

An ac generator supplies a peak (not rms) voltage of 150 V at 60.0 Hz. The generator is connected in series with a 35-mH inductor, a 45-µF capacitor and an 85-$\varOmega$ resistor.
-What is the impedance of the circuit?

Accepted Answer

A) 13 $\varOmega$ 
B) 23 $\varOmega$ 
C) 59 $\varOmega$ 
D) 85 $\varOmega$ 
E) 97 $\varOmega$ 
A) 13 $\varOmega$ 
B) 23 $\varOmega$ 
C) 59 $\varOmega$ 
D) 85 $\varOmega$ 
E) 97 $\varOmega$

Question 12

A 315-$\varOmega$ resistor is connected in series with a parallel-plate capacitor across the terminals of a 60.0-Hz ac generator. When the gap between the plates is empty, its capacitance is 2.65 µF. Determine the ratio of the rms current in the circuit when the capacitor is empty to that when ruby mica ($\kappa$ = 5.40) is inserted between the plates?

Accepted Answer

A) 2.87 
B) 2.32 
C) 0.430 
D) 0.348 
E) 0.253 
A) 2.87 
B) 2.32 
C) 0.430 
D) 0.348 
E) 0.253

Question 13

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300-$\varOmega$ resistor.
-What is the average power supplied to the circuit?

Accepted Answer

A) 48 W 
B) 54 W 
C) 63 W 
D) 83 W 
E) 112 W 
A) 48 W 
B) 54 W 
C) 63 W 
D) 83 W 
E) 112 W

Question 14

An ac generator supplies a peak (not rms) voltage of 120.0 V at 60.0 Hz. It is connected in series with a 50.0-$\varOmega$ resistor and a 0.500-H inductor.
-What is the rms current through the resistor?

Accepted Answer

A) 2.40 A 
B) 1.71 A 
C) 1.33 A 
D) 0.617 A 
E) 0.437 A 
A) 2.40 A 
B) 1.71 A 
C) 1.33 A 
D) 0.617 A 
E) 0.437 A

Question 15

Which one of the following statements concerning diodes is false?

Accepted Answer

A) A diode is fabricated by forming junctions between one n-type and two p-type semiconductors or one p-type and two n-type semiconductors. 
B) At an n-p junction in a diode that is not connected to a battery, an electric field exists across the junction. 
C) A battery can be connected to a diode so that a continual flow of charge results. 
D) A diode connected to an ac source allows current to flow only in one direction. 
E) Holes move in a diode under a forward-bias condition. 
A) A diode is fabricated by forming junctions between one n-type and two p-type semiconductors or one p-type and two n-type semiconductors. 
B) At an n-p junction in a diode that is not connected to a battery, an electric field exists across the junction. 
C) A battery can be connected to a diode so that a continual flow of charge results. 
D) A diode connected to an ac source allows current to flow only in one direction. 
E) Holes move in a diode under a forward-bias condition.

Question 16

Which one of the following statements best explains why semiconductors in transistors are doped?

Accepted Answer

A) Doping makes the charge carriers mobile. 
B) Doping makes the charge carriers immobile. 
C) Doping makes the semiconducting material non-conducting. 
D) Doping increases the conductive properties of the semiconductors. 
E) Doping converts the semiconducting material into a metallic material like copper. 
A) Doping makes the charge carriers mobile. 
B) Doping makes the charge carriers immobile. 
C) Doping makes the semiconducting material non-conducting. 
D) Doping increases the conductive properties of the semiconductors. 
E) Doping converts the semiconducting material into a metallic material like copper.

Question 17

The following table gives the reactance and rms voltage across the elements of a series RCL circuit:  
-What is the rms current in the circuit?

Accepted Answer

A) 0.25 A 
B) 0.43 A 
C) 0.50 A 
D) 0.86 A 
E) 1.08 A 
A) 0.25 A 
B) 0.43 A 
C) 0.50 A 
D) 0.86 A 
E) 1.08 A

Question 18

Which one of the following phasor models correctly represents a circuit comprised of only an inductor and an ac generator?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) e 
A) a 
B) b 
C) c 
D) d 
E) e

Question 19

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300-$\varOmega$ resistor.
-What is the peak (not rms) current through the resistor?

Accepted Answer

A) 0.46 A 
B) 0.52 A 
C) 0.65 A 
D) 0.78 A 
E) 0.85 A 
A) 0.46 A 
B) 0.52 A 
C) 0.65 A 
D) 0.78 A 
E) 0.85 A

Question 20

An ac voltage source that has a frequency f is connected across the ends of an inductor. Which one of the following statements correctly indicates the effect on the inductive reactance when the frequency is increased to 2f?

Accepted Answer

A) The inductive reactance increases by a factor of two. 
B) The inductive reactance increases by a factor of four. 
C) The inductive reactance is unchanged. 
D) The inductive reactance decreases by a factor of four. 
E) The inductive reactance decreases by a factor of two. 
A) The inductive reactance increases by a factor of two. 
B) The inductive reactance increases by a factor of four. 
C) The inductive reactance is unchanged. 
D) The inductive reactance decreases by a factor of four. 
E) The inductive reactance decreases by a factor of two.

Exam 23: Alternating Current Circuits

A series RCL circuit is comprised of a 3.00-mH inductor and a 5.00-µF capacitor. What is the resonant frequency of this circuit?

Which one of the following materials would be in an n-type semiconductor?

When the frequency of an ac circuit is increased at constant voltage, the current increases and then decreases. Which combination of elements is most likely to comprise this circuit?

A 14.0-µF capacitor and a 1480- Ω\varOmegaΩ resistor are connected in series to a generator operating at 50.0 Hz and producing an rms voltage of 208 V. What is the average power dissipated in this circuit?

Complete the following statement: The main difference between an npn transistor and a pnp transistor is that

An ac generator supplies a peak (not rms) voltage of 150 V at 60.0 Hz. The generator is connected in series with a 35-mH inductor, a 45-µF capacitor and an 85- Ω\varOmegaΩ resistor. -What is the capacitive reactance for this circuit?

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- Ω\varOmegaΩ resistor. -What is the capacitive reactance?

Which one of the following graphs illustrates how capacitive reactance varies with frequency?

The graph shows the voltage across and the current through a single circuit element connected to an ac generator. -Identify the circuit element.

A series RCL circuit operating at 60.0 Hz contains a 49- Ω\varOmegaΩ resistor and an 5.0-µF capacitor. If the power factor of the circuit is +1.00, what is the inductance of the inductor in this circuit?

An ac generator supplies a peak (not rms) voltage of 150 V at 60.0 Hz. The generator is connected in series with a 35-mH inductor, a 45-µF capacitor and an 85- Ω\varOmegaΩ resistor. -What is the impedance of the circuit?

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- Ω\varOmegaΩ resistor. -What is the average power supplied to the circuit?

An ac generator supplies a peak (not rms) voltage of 120.0 V at 60.0 Hz. It is connected in series with a 50.0- Ω\varOmegaΩ resistor and a 0.500-H inductor. -What is the rms current through the resistor?

Which one of the following statements concerning diodes is false?

Which one of the following statements best explains why semiconductors in transistors are doped?

The following table gives the reactance and rms voltage across the elements of a series RCL circuit: -What is the rms current in the circuit?

Which one of the following phasor models correctly represents a circuit comprised of only an inductor and an ac generator?

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- Ω\varOmegaΩ resistor. -What is the peak (not rms) current through the resistor?

An ac voltage source that has a frequency f is connected across the ends of an inductor. Which one of the following statements correctly indicates the effect on the inductive reactance when the frequency is increased to 2f?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Impulse and Momentum

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Electromagnetic Waves

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

Filters

A 14.0-µF capacitor and a 1480- $\varOmega$ resistor are connected in series to a generator operating at 50.0 Hz and producing an rms voltage of 208 V. What is the average power dissipated in this circuit?

An ac generator supplies a peak (not rms) voltage of 150 V at 60.0 Hz. The generator is connected in series with a 35-mH inductor, a 45-µF capacitor and an 85- $\varOmega$ resistor. -What is the capacitive reactance for this circuit?

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- $\varOmega$ resistor. -What is the capacitive reactance?

A series RCL circuit operating at 60.0 Hz contains a 49- $\varOmega$ resistor and an 5.0-µF capacitor. If the power factor of the circuit is +1.00, what is the inductance of the inductor in this circuit?

An ac generator supplies a peak (not rms) voltage of 150 V at 60.0 Hz. The generator is connected in series with a 35-mH inductor, a 45-µF capacitor and an 85- $\varOmega$ resistor. -What is the impedance of the circuit?

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- $\varOmega$ resistor. -What is the average power supplied to the circuit?

An ac generator supplies a peak (not rms) voltage of 120.0 V at 60.0 Hz. It is connected in series with a 50.0- $\varOmega$ resistor and a 0.500-H inductor. -What is the rms current through the resistor?

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- $\varOmega$ resistor. -What is the peak (not rms) current through the resistor?