Review Game Zone
Flash Cards
(current)
Games
Teachers
Search
Rad135 Ch4 Electromagnetism- Part 2
Test Description: This content covers chapter 4 (Electromagnetism- part 2) from the text to help you prepare for the midterm exam in Rad135.
Instructions: Answer all questions to get your test result.
1) If the primary side of a transformer reads 110 volts and 200 amperes, what will the secondary voltage be if the turns ratio is 900:1? (Turns ratio is Ns/Np)
A
99 volts
B
99kV
C
122 volts
D
222 mA
2) A rectifier _______
A
converts DC to AC
B
converts AC to DC
C
refers to a type of electromagnetic device
D
changes electron flow to current flow
3) Which of the following is TRUE referring to the autotransformer?
A
It has a fixed-ratio transformer
B
The turns ratio rule does not apply to an autotransformer.
C
It operates via self-induction
D
It has no moving parts
4) Which of the following is TRUE about a capacitor?
A
It does not have to be charged to be operable
B
It has four moving parts
C
It consists of two plates with the same charge
D
It is a device capable of accumulating and storing electrical charge
5) The design of an x-ray tube requires that electrons flow through it in only one direction. If an alternating current were supplied to the x-ray tube at high voltage without rectification, what would be the result?
A
the radiaion produced would be 1/4
B
the electron flow would destroy the filament and the x-ray tube
C
radiation would flow from the filament to the cathode
D
nothing
6) The transformer with more secondary windings than primary windings ____.
A
is a step-down transformer
B
has a higher power loss
C
has a greater amperage output than input
D
has a greater secondary voltage
7) The inherent power loss of electrical conduction through solid wire conductors ____.
A
is lower with current flow rather than electron flow
B
has no relationship with current flow
C
is minimized with higher voltage transmission
D
results from space charge
8) Conventional current flows ____.
A
from anode to cathode
B
in either direction
C
in the same direction as electron flow
D
from cathode to anode
9) All of the following are true of transformers except:
A
they are designed to regulate voltage with a fixed ratio
B
the work on the principle of mutual induction
C
they have no moving parts
D
they work most efficiently on DC
10) The efficiency of a transformer is NOT affected by ____.
A
hysteresis loss
B
the transformer turns ratio
C
power loss
D
eddy current loss
11) A ____ is a source of direct current.
A
AC generator
B
spark
C
battery
D
wall outlet
12) A stator consists of: ____.
A
electromagnets
B
commutator rings
C
a rotor
D
bars of copper around an iron core
13) Alternating current is produced by a ____.
A
motor
B
battery
C
generator
D
capacitor
14) An electrical potential applied to a conductor produces a(n): ____.
A
electrical current
B
magnetic field
C
charged insulator
D
both a and b
15) Which of the following is FALSE concerning electromagnetic energies?
A
they are arranged in an orderly spectrum according to frequency and wavelength
B
the relationship between frequency and wavelength is direct and proportional
C
they possess both wave and particle characteristics
D
they are illustrated as sinusoidal waves
16) Which equation is the transfomer law, expressing the direct relationship between number of turns in the coil and voltage?
A
V = I x R
B
I2R
C
Vs / Vp = Ns/ Np
D
E = mc^2
17) Which of the following does not contribute to transformer inefficiencies?
A
hysteresis loss
B
I2R loss
C
eddy current loss
D
mutual induction
18) Which is false regarding capacitors?
A
composed of two oppositely charged metal plates
B
includes an autotransformer in its configuration
C
accumulates and stores a charge
D
supplies direct current
19) Solid-state diodes...
A
are charged by mutual induction
B
use p-n junction semiconductors
C
are used as a target material
D
convert DC to AC
20) Which is false regarding motors?
A
Induction motors have a rotor and a stator
B
photons are produced within the motor housing
C
DC motors have commutator (split) rings
D
AC motors have slip rings
*select an answer for all questions
Check Results & Get Answers
Play Games with the Questions Above
Teachers: Create FREE classroom games with your questions
Click for more info!
©2007-2024
ReviewGameZone.com
|
About
|
Privacy
|
Contact
|
Terms
|
Site Map
WAIT! Find what you needed?
×
Still Looking for the Answers?
Have Another Question?
Play a Review Game with These Questions?
Want to Make Your Own Test Like This One?