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Rad135 Ch4 Electromagnetism- Part 1
Test Description: This content covers chapter 4 (Electromagnetism- part 1) from the text to help you prepare for the midterm exam in Rad135.
Instructions: Answer all questions to get your test result.
1) What is the unit for magnetic flux density and commonly associated with MRI scanners?
A
Gauss
B
Tesla
C
Force
D
Weber
2) What type of temporary magnet is formed by running an electric current around a ferromagnetic core?
A
artificial
B
permanent
C
natural
D
electromagnet
3) According to Faraday's Law of Electromagnetic Induction, the size of the induced current depends on four factors. Which of the following is NOT one of the four factors?
A
angle of the conductor to the magnetic field
B
weight of the conductor
C
strength of magnetic field
D
number of turns of the conductor
4) What are materials such as gadolinium, platinum and aluminum, with low permeability and weak attraction to magnetic fields called?
A
ferromagnetic
B
nonmagnetic
C
diamagnetic
D
paramagnetic
5) What type of magnet is man-made using a steel alloy?
A
natural
B
electromagnet
C
magnetic induction
D
artificial
6) The magnetic flux through a wire loop
A
increases as the magnetic field decreases.
B
decreases as the speed of the wire loop increases
C
is maximum when the plane of the wire loop is perpendicular to the magnetic field.
D
requires a constant magnetic field.
7) The magnetic intensity of an electromagnet is greatly increased by the addition of a(n) ____ core.
A
wood
B
copper
C
aluminum
D
iron
8) A magnetic field is produced by
A
both a and b
B
electric charges in motion
C
permanent magnets only
D
electric charges at rest
9) Resting an ordinary paperclip in a stationary magnetic field results in:
A
nothing
B
current production
C
magnetic induction
D
repulsion because the paperclip is diamagnetic
10) Which of the following does NOT apply to the concept of mutual induction?
A
two coils are placed in proximity and a varying current is supplied
B
only one coil is present
C
the primary coil is supplied with current
D
current in the secondary coil is induced by the primary coil
11) What piece of equipment is supplied with an electrical current to make a mechanical motion?
A
soloniod
B
diode
C
electromagnet
D
motor
12) What is the SI unit for magnetic flux density?
A
Weber
B
Gauss
C
volt
D
Tesla
13) A charged particle in motion creates a(n) ____.
A
negative charge
B
magnetic field
C
positive charge
D
electrostatic field
14) Which of the following is FALSE of auto-transformers?
A
the primary and secondary windings share a common coil
B
they are considered a variable transformer
C
the primary coils and secondary coils are in series
D
they are effective in controlling voltage on the high voltage side of the circuit
15) Which is NOT true of magnetic dipoles?
A
no matter how small, a magnet always has two poles
B
they are also known as magentic diodes
C
flow goes from south pole to north pole within the magnet
D
flow goes from north pole to south pole outside the magnet
16) All of the following are magnetic classifications of materials except ______.
A
aeromagnetic
B
nonmagnetic
C
ferromagnetic
D
paramagnetic
17) In the case of mutual induction there are two coils and ______ .
A
fixed current is supplied to the secondary coil
B
varying current is supplied to the secondary coil
C
varying current is supplied to the primary coil
D
fixed current is supplied to the primary coil
18) What is the velocity of all electromagnetic radiation, including all x-ray photons?
A
100 mR/hr at 1 meter
B
3 x 10^8 m/sec
C
minimum of 55 kV
D
E = mc^2
19) Varying magnetic field intensity induces a(n) _________.
A
static discharge
B
insulator
C
magnetic dipole
D
electric current
20) Which is NOT true regarding the unit of flux density, the Tesla?
A
The earth's magnetic field is about 0.00001 T
B
An MRI magnet can be 3T
C
Tesla fluctuates with temperature
D
1 Tesla = 10,000 Gauss
*select an answer for all questions
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