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predicted resistivity to increase about four times. The
increase of resisitivity will probably not cause opera-
tional problems with the favorable ash produced when
the November samples were taken. However, low power
levels and high opacity may be a problem if ash quality
is similar to that encountered in September. If high resis-
tivity problems occur when burning the high magnesium
residue, injection of sodium sulfite (Na2S) to increase
the sodium oxide levels in the ash to 1.5% will lower
resistivities to an acceptable level.
59.
Data from the ash analysis was input into a com-
puter model developed by:
A.
U.S.D.A.
C.
U.S.D.O.T.
B.
U.S.D.O.E.
D.
none of the above.
60.
The primary difference between ash samples
was:
A.
one was from waste fuel and one was from
coal.
B.
the samples were collected at two different
temperatures.
C.
the loss on ignition.
D.
none of the above.
61.
What is the percent basis contribution of the
coal to the total amount of ash produced?
A.
3.9%
C.
96.1%
B.
3.71%
D.
69.1%
62.
A hypothetical sample #5 was created that
increased the resistivity of the sample. What
oxide was increased to create this sample?
A.
sodium oxide
C.
calcium oxide
B.
iron oxide
D.
magnesium oxide
63.
What was the date of the first ash samples
received?
A.
September 1989
C.
November 1989
B.
November 1987
D.
none of the above
64.
Which of the following statement(s) is/are sup-
ported by the information in the passage?
I.
Carbon content of the ash affects the elec-
trical resistivity of the ash.
II.
Magnesium oxide lowers the electrical
resistivity of the ash.
III.
Sodium oxide raises the electrical resistiv-
ity of the ash.
A.
I only
C.
I and II only
B.
II and III only
D.
I, II, and III
65.
What is the probable reason this passage was
written?
A.
To discuss hazardous components of coal
ash
B.
To predict water treatment characteristics
of a waste stream
C.
To determine the impact of future fuel
composition changes on electrical charac-
teristics of fly ash
D.
To calculate the composition of feed stock
necessary in the production of resistors
used in the electronics industry
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