Which of the following is used for piping natural gas?
A) Copper B) Galvanized iron C) White iron D) Black iron
D
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A penny and a nickel are tossed. The penny has probability 0.4 of coming up heads, and the nickel has probability 0.6 of coming up heads. Let X=1 if the penny comes up heads, and let X=0 if the penny comes up tails. Let Y=1 if the nickel comes up heads, and let Y=0 if the nickel comes up tails.
a. Find the probability mass function of X. b. Find the probability mass function of Y. c. Is it reasonable to assume that X and Y are independent? Why? d. Find the joint probability mass function of X and Y.
Which color temperature produces a balance between warmth and coolness?
a. 2,000K b. 3,000K c. 3,500K d. 4,500K
As shown in Fig. 12.72, a three-phase four-wire line with a phase voltage of 120 V rms, with a positive phase sequence, supplies a balanced motor load at 260 kVA at 0.85 pf lagging. The motor load is connected to the three main lines marked a, b, and c. In addition, incandescent lamps (unity pf) are connected as follows: 24 kW from line a to the neutral, 15 kW from line b to the neutral, and 9 kW from line c to the neutral.
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A(n) ____________________ lamp indicates that there is no flow of water when the circuit is energized.
Fill in the blank(s) with the appropriate word(s).