The insulation in a low-slope roof may consist of board insulation or non-board insulation. Which board insulation is most commonly used and why? Give its R-value per inch thickness.

What will be an ideal response?


Polyisocyanurate (ISO) board insulation is commonly used because of its greater resistance to high temperature and
its high R-value ?6.50 per inch.

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The primary side of the delta-connected transformer may be connected so as to reverse the ____________________ of one of its legs.

Fill in the blank(s) with the appropriate word(s).

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For binary division

A) subtract the dividend from the divisor then add the results to the dividend. B) invert the divisor and add the numbers. C) subtract the divisor from the dividend until you reach zero or get a negative number. D) None of the above.

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Indicate whether the statement is true or false

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