What type of fixed resistor is made by winding a piece of resistive wire around a ceramic core?
A. carbon film
B. metal film
C. metal glaze
D. wire-wound
Answer: D
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A box contains four 75 W lightbulbs, three 60 W lightbulbs, and three burned-out lightbulbs. Two bulbs are selected at random from the box. Let X represent the number of 75 W bulbs selected, and let Y represent the number of 60 W bulbs selected.
a. Find the joint probability mass function of X and Y.
b. Find 
.
c. Find 
.
d. Find 
.
e. Find 
.
f. Find Cov(X,Y).
g. Find 
.
Two of the most common wood species used for scaffold planks are southern yellow pine and ____.
a.Ponderosa pine b.Western hemlock c.Atlas cedar d.Douglas fir
Mortar used for laying brick and concrete block shall consist of (2) parts masonry cement to (3) parts sand.
Answer the following statement true (T) or false (F)
Expansion fittings are generally provided in exposed runs of Type PVC where __________.
a. the run is long b. the run is subject to large temperature variations during or after installation c. expansion and contraction measures are provided for the building or other structures d. All of the above