Download Reading Quizzes III

Reading Quiz #17
1) EMF stands for …
a) Electromagnetic force
b) Electromagnetic flux
c) Electromotive force
2) Faraday’s Law says that the emf induced in a
loop is
a)
b)
c)
d)
proportional to the current enclosed in the loop
proportional to the magnetic field around the loop
proportional to the magnetic flux through the loop
proportional to the change of the magnetic flux
through the loop
Reading Quiz #18
1) An electric generator …
a) Is the reverse of an electric motor
b) Changes mechanical energy into electrical energy
c) All of the above
d) None of the above
2) The secondary voltage in a transformer is …
a) Higher if the number of secondary turns is lower
b) Higher if the number of secondary turns is higher
c) Only the currents are transformed
Reading Quiz #19
1) The self-inductance L of a device …
a) … occurs only in dc circuits
b) … impedes the flow of a current through a device
c) … is a property of the device
d) two of the above
2) The energy stored in an inductor is proportional to
a) I
b) I2
c) I3
3) The unit of inductance is
a) Weber b) Tesla c) Henry
d) Farad
Reading Quiz #20
1) When an LR circuit is first disconnected
from a battery, the current decays …
a) linearly
b) logarithmically
c) instantaneously
d) exponentially
2) In an EM oscillator, what is oscillating?
a)
b)
c)
d)
e)
Charge Q
Current I
Inductance L
All of the above
Two of the above
Reading Quiz #21
1) In AC circuits the current and the voltage are
a)
b)
c)
d)
in phase
voltage is ahead of current
current is ahead of voltage
Depends on the specific circuit
2) What happens at resonance in an AC
circuit?
a)
b)
c)
d)
Voltage is maximal
Voltage is minimal
Current is maximal
Current is minimal
Reading Quiz #22
1) How many Maxwell equations are there?
a) two
b) three
c) four
d) five e) six
2) Which of the following is not one of
Maxwell’s equations?
a)
b)
c)
d)
Ohm’s law
Gauss’ law
Faraday’s law
Ampere’s law
Reading Quiz #23
1) Which of the following is not an EM wave?
a)
b)
c)
d)
e)
X rays
Radio waves
Microwaves
Sound waves
Light
2) The higher the frequency of an EM wave…
a) the lower its energy
b) the shorter its wavelength
c) the lower its velocity
d) two of the above