A1256654099OgUSt - PowerPoint PPT Presentation

Title: A1256654099OgUSt


1
NEETS MODULE 21 CHAPTER 1
2
Q
At what point on a meter movement are the
most Accurate readings taken?
A
midscale
Question Source
3
Q
What are the primary disadvantages of vtvms?
A
Long warm up time Requirements for ac power
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4
Q
What meter provides one of the most accurate
methods Of measuring dc voltage?
A
Differential voltmeter
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5
Q
What are the advantages of using 2 voltmeters in
series?
A
Increased input impedance Greater
accuracy Increased voltage range
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6
Q
What is the apparent displacement of the position
of An object because of the difference between 2
points Of view and what has been installed on the
meter to Eliminate this problem?
A
Parallax Mirror on the scale
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7
Q
The input impedance of your test equipment
should Exceed the impedance of the circuit under
test by What ration?
A
101
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8
Q
Voltages are usually measured by placing the
Measuring deice in serial or parallel with
component (load) being measured?
A
parallel
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9
Q
What assures the accuracy of your electronic
test equipment?
A
Its calibration
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10
Q
What system is designed to compare your
electronic Test equipment with test equipment of
much greater accuracy?
A
METCAL Navys meteorology calibration program
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11
Q
What bridge measures inductance by comparing
an Inductor to capacitance (only)?
A
Hay bridge
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12
Q
Capacitance is measured in what and determined by
what?
A
Farads Area of plates Distance between
plates Type of dielectric
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13
Q
_______ are essentially coaxial lines without
center Conductors and are constructed from
conductive material?
A
waveguides
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14
Q
What are the advantages of using a differential
voltmeter For measuring dc voltages?
A
Extreme accuracy Minimal circuit loading
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15
Q
Ideally an oscope presentation should cover
what Vertical portion of the screen?
A
60
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16
Q
When performing ac voltage measurement with a
Digital multimeter they show ______ _______?
A
True rms
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17
Q
What are the advantages of connecting ammeters
in Parallel when performing current measurements?
How Is it connected to the circuit?
A
Increases range of measurements Decreases total
internal meter resistance with respect to Load
resistance In series
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18
Q
Low-resistance measurements that require
precision Readings should be taken with what
test equipment?
A
Bridge type
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19
Q
How do you compensate for the resistance of the
test Leads of a meter?
A
Short leads together(zero out) to adjust for
midscale setting
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20
Q
Losses caused by resistance increase with
frequency. This results in a concentration of
current near the outer Surface of the wire,
called _______ ________?
A
Skin effect
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21
Q
Which is more accurate, the bridge or reactance
type meter?
A
Bridge type
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22
Q
Is the current flow through an inductor directly
or Inversely proportional to its inductance
value?
A
Directly proportional
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23
Q
What type of core produces the greatest
inductance?
A
Magnetic metal
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24
Q
The 5 basic measurements are?
A
Voltage Current Resistance Capacitance inductance
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25
Q
Name 3 factors contributing to inductor losses?
A
Eddy currents Dielectric properties in
coil Hysterisis in core
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26
Q
What bridge measures inductance by using
capacitance And 2 resistances?
A
Maxwell bridge
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27
Q
?
A
r
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