Upload
daniel-zahn
View
244
Download
0
Embed Size (px)
Citation preview
7/24/2019 Phys201 Rq Ch31
1/45
Halliday/Resnick/Walker
Fundamentals of Physics 8thedition
Classroom Response System Questions
Chapter 31 Electromagnetic Oscillationsand AC Current
Reading Quiz Questions
7/24/2019 Phys201 Rq Ch31
2/45
31.2.1. Which one of the following quantities remains constant for a
given LC circuit
a! the energy store" in the capacitor
#! the energy store" in the in"uctor
c! the energy store" in the current flowing in the circuit
"! the sum of the energy store" in the capacitor an" that in the
in"uctor
e! the energy "issipate" in the circuit
7/24/2019 Phys201 Rq Ch31
3/45
31.2.1. Which one of the following quantities remains constant for a
given LC circuit
a! the energy store" in the capacitor
#! the energy store" in the in"uctor
c! the energy store" in the current flowing in the circuit
"! the sum of the energy store" in the capacitor an" that in the
in"uctor
e! the energy "issipate" in the circuit
7/24/2019 Phys201 Rq Ch31
4/45
31.3.1. $he te%t ma&es a comparison #etween an LC circuit an" a
#loc&'spring system. (n this analogy) the in"uctance correspon"sto which of the following parameters for the #loc&'spring system
a! mass
#! spring constant
c! velocity
"! position
e! spring potential energy
7/24/2019 Phys201 Rq Ch31
5/45
31.3.1. $he te%t ma&es a comparison #etween an LC circuit an" a
#loc&'spring system. (n this analogy) the in"uctance correspon"sto which of the following parameters for the #loc&'spring system
a! mass
#! spring constant
c! velocity
"! position
e! spring potential energy
7/24/2019 Phys201 Rq Ch31
6/45
31.3.2. Which one of the following is the correct e%pression for the
angular frequency of oscillation for an LC circuit
a!
#!
c!
"!
e!
LC =
LC =
1
LC =
1
LC=
2
LC
=
7/24/2019 Phys201 Rq Ch31
7/45
31.3.2. Which one of the following is the correct e%pression for the
angular frequency of oscillation for an LC circuit
a!
#!
c!
"!
e!
LC =
LC =
1
LC =
1
LC=
2
LC
=
7/24/2019 Phys201 Rq Ch31
8/45
31.*.1. Which one of the following statements concerning the electrical an"
magnetic energies store" in an LC circuit is false +ssume for the following
that , -.
a! $he ma%imum values of #oth the electric an" magnetic energies is Q2/2C.
#! $he electric energy is at its minimum when the magnetic energy is ero
/oules.
c! +t a time t) the sum of the electric an" magnetic energies is a constant equal
to Q2/2C.
"! $he electric energy varies in time with the factor) cos2t.
e! $he magnetic energy is at its ma%imum when the electric energy is ero
/oules.
7/24/2019 Phys201 Rq Ch31
9/45
31.*.1. Which one of the following statements concerning the electrical an"
magnetic energies store" in an LC circuit is false +ssume for the following
that , -.
a! $he ma%imum values of #oth the electric an" magnetic energies is Q2/2C.
#! $he electric energy is at its minimum when the magnetic energy is ero
/oules.
c! +t a time t) the sum of the electric an" magnetic energies is a constant equal
to Q2/2C.
"! $he electric energy varies in time with the factor) cos2t.
e! $he magnetic energy is at its ma%imum when the electric energy is ero
/oules.
7/24/2019 Phys201 Rq Ch31
10/45
31.0.1. Which of the following choices #est gives the #enefits! of
using +C over using C
a! $he length of wires is less relevant.
#! ower may #e transferre" over long "istances using higher voltage
an" low current.
c! $he potential "ifference may #e varie" using transformers.
"! +ny potential loss in resistive elements is negligi#le.
e! +ll of the a#ove answers are #enefits of +C over C.
7/24/2019 Phys201 Rq Ch31
11/45
31.0.1. Which of the following choices #est gives the #enefits! of
using +C over using C
a! $he length of wires is less relevant.
#! ower may #e transferre" over long "istances using higher voltage
an" low current.
c! $he potential "ifference may #e varie" using transformers.
"! +ny potential loss in resistive elements is negligi#le.
e! +ll of the a#ove answers are #enefits of +C over C.
7/24/2019 Phys201 Rq Ch31
12/45
31.0.2. (n an +C circuit) electrons are moving #ac& an" forth at a
frequency . $he signal that the electrons receive to change"irection comes from the generating station. What is the spee" of
that signal
a! v,xT) wherexis the "istance to a given electron an" Tis the
perio" of oscillation.
#! very close to the spee" of light
c! faster than the spee" of light
"! the "rift velocity of the electrons
e! the spee" of soun" in the metal wire
7/24/2019 Phys201 Rq Ch31
13/45
31.0.2. (n an +C circuit) electrons are moving #ac& an" forth at a
frequency . $he signal that the electrons receive to change"irection comes from the generating station. What is the spee" of
that signal
a! v,xT) wherexis the "istance to a given electron an" Tis the
perio" of oscillation.
#! very close to the spee" of light
c! faster than the spee" of light
"! the "rift velocity of the electrons
e! the spee" of soun" in the metal wire
7/24/2019 Phys201 Rq Ch31
14/45
31.4.1. Which of the following #est "escri#es the termforced
oscillations
a! oscillations requiring an applie" force
#! oscillations that occur at a frequency other than the natural
frequency of the circuit
c! oscillations that occur in the win"ings of the in"uctor within an
LRC circuit
"! oscillations that occur at the natural frequency of the circuit
e! oscillations that occur within the #attery of an LRC circuit
7/24/2019 Phys201 Rq Ch31
15/45
31.4.1. Which of the following #est "escri#es the termforced
oscillations
a! oscillations requiring an applie" force
#! oscillations that occur at a frequency other than the natural
frequency of the circuit
c! oscillations that occur in the win"ings of the in"uctor within an
LRC circuit
"! oscillations that occur at the natural frequency of the circuit
e! oscillations that occur within the #attery of an LRC circuit
7/24/2019 Phys201 Rq Ch31
16/45
31.5.1. +n alternating current is set up in an LRC circuit. 6or which
of the following circuit elements are the current an" voltage inphase
a! in"uctor only
#! resistor only
c! capacitor only
"! resistor an" capacitor only
e! in"uctor) resistor) an" capacitor
7/24/2019 Phys201 Rq Ch31
17/45
31.5.1. +n alternating current is set up in an LRC circuit. 6or which
of the following circuit elements are the current an" voltage inphase
a! in"uctor only
#! resistor only
c! capacitor only
"! resistor an" capacitor only
e! in"uctor) resistor) an" capacitor
7/24/2019 Phys201 Rq Ch31
18/45
31.5.2. +n alternating current is set up in an LRC circuit. 6or which
of the following circuit elements "oes the current lea" the voltage#y 7-
a! in"uctor only
#! resistor only
c! capacitor only
"! resistor an" capacitor only
e! in"uctor) resistor) an" capacitor
7/24/2019 Phys201 Rq Ch31
19/45
31.5.2. +n alternating current is set up in an LRC circuit. 6or which
of the following circuit elements "oes the current lea" the voltage#y 7-
a! in"uctor only
#! resistor only
c! capacitor only
"! resistor an" capacitor only
e! in"uctor) resistor) an" capacitor
7/24/2019 Phys201 Rq Ch31
20/45
31.5.3. +n alternating current is set up in an LRC circuit. 6or which
of the following circuit elements "oes the voltage lea" the current#y 7-
a! in"uctor only
#! resistor only
c! capacitor only
"! resistor an" capacitor only
e! in"uctor) resistor) an" capacitor
7/24/2019 Phys201 Rq Ch31
21/45
31.5.3. +n alternating current is set up in an LRC circuit. 6or which
of the following circuit elements "oes the voltage lea" the current#y 7-
a! in"uctor only
#! resistor only
c! capacitor only
"! resistor an" capacitor only
e! in"uctor) resistor) an" capacitor
7/24/2019 Phys201 Rq Ch31
22/45
31.5.*. What is the S( unit for capacitive reactance
a! fara"
#! mho
c! ohm
"! cor"el
e! reyn
7/24/2019 Phys201 Rq Ch31
23/45
31.5.*. What is the S( unit for capacitive reactance
a! fara"
#! mho
c! ohm
"! cor"el
e! reyn
7/24/2019 Phys201 Rq Ch31
24/45
31.5.8. Which one of the following choices is not a property of a
phasor
a! angular spee"
#! emf
c! length
"! pro/ection
e! rotation angle
7/24/2019 Phys201 Rq Ch31
25/45
31.5.8. Which one of the following choices is not a property of a
phasor
a! angular spee"
#! emf
c! length
"! pro/ection
e! rotation angle
7/24/2019 Phys201 Rq Ch31
26/45
31.5.0. When a capacitor is use" in an alternating current circuit) the current in the
capacitor is relate" to the voltage across the capacitor #y its capacitive
reactance) which "epen"s on the capacitance of the capacitor an" the frequency
of the generator. Which one of the following statements correctly "escri#es the
relationship #etween the capacitive reactance an" the frequency
a! $he capacitive reactance is "irectly proportional to the frequency.
#! $he capacitive reactance is "irectly proportional to the square of the frequency.
c! $he capacitive reactance is inversely proportional to the frequency.
"! $he capacitive reactance is inversely proportional to the square of the frequency.
e! $he capacitive reactance is "irectly proportional to the square root of the
frequency.
7/24/2019 Phys201 Rq Ch31
27/45
31.5.0. When a capacitor is use" in an alternating current circuit) the current in the
capacitor is relate" to the voltage across the capacitor #y its capacitive
reactance) which "epen"s on the capacitance of the capacitor an" the frequency
of the generator. Which one of the following statements correctly "escri#es the
relationship #etween the capacitive reactance an" the frequency
a! $he capacitive reactance is "irectly proportional to the frequency.
#! $he capacitive reactance is "irectly proportional to the square of the frequency.
c! $he capacitive reactance is inversely proportional to the frequency.
"! $he capacitive reactance is inversely proportional to the square of the frequency.
e! $he capacitive reactance is "irectly proportional to the square root of the
frequency.
7/24/2019 Phys201 Rq Ch31
28/45
31.5.4. When an in"uctor is use" in an alternating current circuit) the current in the
in"uctor is relate" to the voltage across the in"uctor #y its in"uctive reactance)
which "epen"s on the in"uctance of the in"uctor an" the frequency of the
generator. Which one of the following statements correctly "escri#es the
relationship #etween the in"uctive reactance an" the frequency
a! $he in"uctive reactance is "irectly proportional to the frequency.
#! $he in"uctive reactance is "irectly proportional to the square of the frequency.
c! $he in"uctive reactance is inversely proportional to the frequency.
"! $he in"uctive reactance is inversely proportional to the square of the frequency.
e! $he in"uctive reactance is "irectly proportional to the square root of the
frequency.
7/24/2019 Phys201 Rq Ch31
29/45
31.5.4. When an in"uctor is use" in an alternating current circuit) the current in the
in"uctor is relate" to the voltage across the in"uctor #y its in"uctive reactance)
which "epen"s on the in"uctance of the in"uctor an" the frequency of the
generator. Which one of the following statements correctly "escri#es the
relationship #etween the in"uctive reactance an" the frequency
a! $he in"uctive reactance is "irectly proportional to the frequency.
#! $he in"uctive reactance is "irectly proportional to the square of the frequency.
c! $he in"uctive reactance is inversely proportional to the frequency.
"! $he in"uctive reactance is inversely proportional to the square of the frequency.
e! $he in"uctive reactance is "irectly proportional to the square root of the
frequency.
7/24/2019 Phys201 Rq Ch31
30/45
31.7.1. Which of the following phrases #est "escri#es the term
impedance
a! the resistance to the movement of charge carriers
#! the resistance of a capacitor
c! the resistance of an in"uctor
"! the internal resistance of a #attery within an LRC circuit
e! the generalie" e%pression that com#ines all resistances within a
circuit
7/24/2019 Phys201 Rq Ch31
31/45
31.7.1. Which of the following phrases #est "escri#es the term
impedance
a! the resistance to the movement of charge carriers
#! the resistance of a capacitor
c! the resistance of an in"uctor
"! the internal resistance of a #attery within an LRC circuit
e! the generalie" e%pression that com#ines all resistances within a
circuit
7/24/2019 Phys201 Rq Ch31
32/45
31.7.2. 6or an RLC circuit in the limit of very high frequency) what is
the effective #ehavior of the capacitor an" the in"uctor in thecircuit
a! $he in"uctor acts li&e a very small resistance an" the capacitor acts
li&e a very large resistance.
#! $he in"uctor acts li&e a very large resistance an" the capacitor acts
li&e a very small resistance.
c! $he in"uctor acts li&e a very large resistance an" the capacitor actsli&e a very large resistance.
"! $he in"uctor acts li&e a very small resistance an" the capacitor acts
li&e a very small resistance.
7/24/2019 Phys201 Rq Ch31
33/45
31.7.2. 6or an RLC circuit in the limit of very high frequency) what is
the effective #ehavior of the capacitor an" the in"uctor in thecircuit
a! $he in"uctor acts li&e a very small resistance an" the capacitor acts
li&e a very large resistance.
#! $he in"uctor acts li&e a very large resistance an" the capacitor acts
li&e a very small resistance.
c! $he in"uctor acts li&e a very large resistance an" the capacitor actsli&e a very large resistance.
"! $he in"uctor acts li&e a very small resistance an" the capacitor acts
li&e a very small resistance.
7/24/2019 Phys201 Rq Ch31
34/45
31.7.3. What effect "oes the resistor in an RLC circuit have on the
circuit9s resonant frequency
a! $he resonant frequency is "etermine" #y the in"uctance an" the
capacitance) #ut not the resistance.
#! (ncreasing the resistance increases the resonant frequency.
c! ecreasing the resistance increases the resonant frequency.
"! (ncreasing the resistance "ecreases the resonant frequency.
e! ecreasing the resistance "ecreases the resonant frequency.
7/24/2019 Phys201 Rq Ch31
35/45
31.7.3. What effect "oes the resistor in an RLC circuit have on the
circuit9s resonant frequency
a! $he resonant frequency is "etermine" #y the in"uctance an" the
capacitance) #ut not the resistance.
#! (ncreasing the resistance increases the resonant frequency.
c! ecreasing the resistance increases the resonant frequency.
"! (ncreasing the resistance "ecreases the resonant frequency.
e! ecreasing the resistance "ecreases the resonant frequency.
7/24/2019 Phys201 Rq Ch31
36/45
31.7.*. Which of the following statements concerning resonance in an
RLC circuit is true
a! +t the resonant frequency) the rms current is at a minimum an" the
rms impe"ance is at a ma%imum.
#! +t the resonant frequency) the rms current is at a ma%imum an" therms impe"ance is at a minimum.
c! +t the resonant frequency) the rms current is at a ma%imum an" the
rms impe"ance is at a ma%imum.
"! +t the resonant frequency) the rms current is at a minimum an" the
rms impe"ance is at a minimum.
7/24/2019 Phys201 Rq Ch31
37/45
31.7.*. Which of the following statements concerning resonance in an
RLC circuit is true
a! +t the resonant frequency) the rms current is at a minimum an" the
rms impe"ance is at a ma%imum.
#! +t the resonant frequency) the rms current is at a ma%imum an" therms impe"ance is at a minimum.
c! +t the resonant frequency) the rms current is at a ma%imum an" the
rms impe"ance is at a ma%imum.
"! +t the resonant frequency) the rms current is at a minimum an" the
rms impe"ance is at a minimum.
7/24/2019 Phys201 Rq Ch31
38/45
31.1-.1. Which of the following choices gives the amount of power
use" #y a capacitor in an ac circuit
a! IrmsXC
#! IrmsXC2
c! VrmsIrms2
"! VrmsXC
e! $he power use" #y the capacitor is equal to ero watts.
7/24/2019 Phys201 Rq Ch31
39/45
31.1-.1. Which of the following choices gives the amount of power
use" #y a capacitor in an ac circuit
a! IrmsXC
#! IrmsXC2
c! VrmsIrms2
"! VrmsXC
e! $he power use" #y the capacitor is equal to ero watts.
7/24/2019 Phys201 Rq Ch31
40/45
31.1-.2. (n a series RLC circuit) the average power is given #y
. What is the name given to the term cos
a! phase factor
#! force term
c! power factor
"! energy "eterminator
e! rms term
cos
rmsrms
VIP =
7/24/2019 Phys201 Rq Ch31
41/45
31.1-.2. (n a series RLC circuit) the average power is given #y
. What is the name given to the term cos
a! phase factor
#! force term
c! power factor
"! energy "eterminator
e! rms term
cos
rmsrms
VIP =
7/24/2019 Phys201 Rq Ch31
42/45
31.11.1. Which of the following is the primary #enefit of impe"ance
matching
a! ma%imum transfer of energy
#! ma%imum resistive loa"
c! same time constant
7/24/2019 Phys201 Rq Ch31
43/45
31.11.1. Which of the following is the primary #enefit of impe"ance
matching
a! ma%imum transfer of energy
#! ma%imum resistive loa"
c! same time constant
7/24/2019 Phys201 Rq Ch31
44/45
31.11.2. (n a well'"esigne" transformer with an iron core) the secon"ary coil has
twice as many turns as the primary coil. Which one of the following statements
concerning this transformer is true
a! $he flu% that passes through each turn of the primary coil is twice the flu% that
passes through the secon"ary coil.
#! $he effect of the iron core is to re"uce the magnetic fiel" passing through thecoils.
c! $he in"uce" emf generate" in the secon"ary coil is twice as large as that
generate" in the primary coil.
"! $his is a step "own transformer #ecause the current in the secon"ary coil is less
than that in the primary coil.
e! $his &in" of transformer is typically use" #etween a power transmission line an"
a resi"ence.
7/24/2019 Phys201 Rq Ch31
45/45
31.11.2. (n a well'"esigne" transformer with an iron core) the secon"ary coil has
twice as many turns as the primary coil. Which one of the following statements
concerning this transformer is true
a! $he flu% that passes through each turn of the primary coil is twice the flu% that
passes through the secon"ary coil.
#! $he effect of the iron core is to re"uce the magnetic fiel" passing through thecoils.
c! $he in"uce" emf generate" in the secon"ary coil is twice as large as that
generate" in the primary coil.
"! $his is a step "own transformer #ecause the current in the secon"ary coil is less
than that in the primary coil.
e! $his &in" of transformer is typically use" #etween a power transmission line an"
a resi"ence.