Explain why steam purged vessels must be backfilled with fuel gas or any suitable gas.

What will be an ideal response?


Backfilling displaces the steam which would condense in the vessel and cause a vacuum.

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Name the pozzolanic material commonly used in contemporary construction. Where is it obtained from and in which situations is it used?

What will be an ideal response?

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Resistors labeled 100 ?have true resistances that are between 80 ?and 120 ?. Let Xbe the resistance of a randomly chosen resistor. The probability density function of X is given by



a. What proportion of resistors have resistances less than 90 ??
b. Find the mean resistance.
c. Find the standard deviation of the resistances.
d. Find the cumulative distribution function of the resistances.

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How did the larvae of the moth Bombyx mori help lead to the discovery of America?

What will be an ideal response?

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The ____ is the brain of the computer.

A. microprocessor B. A/D converter C. program D. interface circuit

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