QUESTION: 65

The try-cock in the schematic above measures ______________.

temperature of water
pressure of water
pressure of steam buildup
level of water

Answer(s): D

Explanation:

Try-cocks measure water level.
Water seeks a level throughout a system, so in the schematic, the try-cock correctly indicates the water level.

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QUESTION: 66

The steel plate above is held in place by different machine screws, each indicated by different symbols. How many different types of machine screws have been used?

Answer(s): A

Explanation:

There are 6 different symbols, so 6 different types of machine screws were used.

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QUESTION: 67

The amount of force (F) needed to balance the lever in the figure above is most nearly __________.

15 pounds
13 pounds
7.5 pounds
20 pounds

Answer(s): B

Explanation:

To determine the amount of force exerted by the cats, first multiply the length of the resistance arm (as it applies to the cat) by the weight of each cat and add the products together.
The 10-pound cat is supported by the entire weight of the resistance arm, so 5 × 10 = 50. The 5-pound cat is being supported by 3 feet of the resistance arm, so 3 × 5 = 15.
Add them up: 50 + 15 = 65.
This number is equal to the length of the resistance arm times effort (force) or 65 = 5F. To isolate F, divide both sides by 5: 65 ÷ 5 = 5F ÷ 5 or 13 = F.

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