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Officer Candidate Tests Practice Test 9: Mechanical Comprehension
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Officer Candidate Tests Practice Test 9: Mechanical Comprehension
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25 Questions

1.
The tank “W” is to be raised as shown by attaching the pull rope to a truck. If the tank is to be raised six feet, the truck will have to move
2.
In the figure above, two sailors are carrying a 300-pound crate slung on a 10-foot pole. On the basis of the data shown in the figure,
3.
In the diagram shown above, if the upper fuse is good and the lower fuse is burned out, the test lamp that will be lighted is
4. Refer to the diagram given below pertaining to the measuring with and reading of a common rule.

The reading at point 1 is
5. Refer to the sketch of a portion of a multimeter (V-O-M) scale shown below. The selector switch on the meter can be set to several different resistance ranges, as well as a number of different DC voltage and milliampere ranges.

If the selector switch is set on the ohms × 100 range, the resistance value indicated is
6.
A piece is to be cut out of the angle iron in order to make the right angle bracket. Angle X should be
7.
In the figure shown above, the weight held by the board and placed on the two identical scales will cause each scale to read
8.
The length of the sheet metal strap before bending was most nearly
9. To determine the exact inside diameter of a metal tube, use tool
10. Refer to the circuit diagram below;

X is a
11.
In the figure shown above, one complete revolution of the windlass drum will move the weight up
12.
The weight in the figure shown above is to be raised by means of the rope attached to the truck. If the truck moves forward 10 feet, the weight will rise
13.
What is the ideal mechanical advantage of the incline shown in the above diagram?
14.
The weight is being carried entirely on the shoulders of the two persons shown above. Which person bears more weight on the shoulder?
15.
In the figure shown above, the micrometer reading to three decimal places is
16.
The correct reading on the voltmeter shown above is
17.
What effort must be exerted to lift a 60-pound weight in the figure of a lever shown above (disregard weight of lever in your computation)?
18.
The symbol given above is the standard circuit symbol for a
19.
Neglecting friction and the weight of the pulley system, what effort is needed to lift the 300-pound weight?
20.
The figure above shows a cam that actuates a valve. If the 10-tooth gear makes six revolutions, the valve will open
21.
The block and tackle shown has two pulleys of equal diameter. While the weight is being raised, pulley #1 will rotate at
22. To lay out a horizontal line in the center of the wall, use tool
23.
The weight on the lever being balanced by the force of 30 pounds, shown in the diagram above, is most nearly
24.
The figure above represents a revolving wheel. The numbers 1 and 2 indicate two fixed points on the wheel. The number 3 indicates the center of the wheel. Of the following, the most accurate statement is that
25. To smooth out a dent in a piece of formed sheet metal, use tool

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