.png){kind=logo}
PDF Download
ASVAB PRACTICE TEST 1 - SECTION 8 - MECHANICAL
COMPREHENSION
Qs and Ans - Expert- Explanation - ing score -25 Questions and Answers
-Format: Multiple-choice / Flashcard
Question 1: Referring to the figure above, which one of the following statements is true?a) If the nut is held stationary and the head turned clockwise, the bolt will move down.b) If the head of the bolt is held stationary and the nut is turned clockwise, the nut will move down.c) If the head of the bolt is held stationary and the nut is turned clockwise, the nut will move up.d) If the nut is held stationary and the head turned counterclockwise, the bolt will move up.
Answer:
- If the head of the bolt is held stationary and the nut is turned clockwise, the nut will move up.
To tighten the bolt, turn it counterclockwise. To tighten the nut on the bolt the reverse is true-turn it clockwise.
Question 2: Automatic operation of a sump pump is controlled by the
a) pneumatic switch.b) float.c) foot valve.d) centrifugal driving unit.
Answer:
- Float
When the water level rises past the safe area, the float turns on the sump pump. When the level of water in the sump goes down, the float also goes down and will shut off the sump pump.Question 3: In the figure shown above, what force must be applied to the 6-inch file scraper to pry up the lid of the paint can? Assume that the average force holding the lid is 50 pounds (disregard weight of file scraper).a) 10 pounds b) 20 pounds c) 30 pounds d) 40 pounds
Answer:
- 10 pounds
Let x = force that must be applied.50×1=x×5 ; 50=5x; x=50/5=10 lbs.
Question 4: The force F needed to balance the lever shown above is, in pounds, most nearly a) 7.5 b) 12.5 c) 10 d) 15
Answer:
- 10
The sum of the moments must be zero.
Summing around the fulcrum we have:
(6 ft. × 5 lbs) + (3 ft. × 10 lbs) = 6 ft. × F
Combining terms, we get:
60 (ft. - lbs) = 6 ft. × F
Dividing both sides by 6: 10 lbs = F
Question 5: When a load is hoisted by means of the tackle shown above, the part that remains stationary is the a) load.b) lower block.c) lower hook.d) upper block.
Answer:
- Upper block
Because the upper block is connected to an immovable hook, it must remain stationary
Question 6: Which hydraulic press requires the LEAST force to lift the weight?
a) A
b) B
c) C
d) All three require the same force.
Answer:
- A
Pressure is defined as Force/Area. For a given force, 20 lbs, the smaller the area, the greater the pressure produced. The smallest area is at position A, requiring the least force to lift the weight.Question 7: If all of the objects shown above are the same temperature, and your temperature is higher than the items' temperature, which will feel coldest?a) A b) B c) C d) D
Answer:
- D image of a key
The metal key has the highest conductivity. Metals are the best conductors of heat. The other choices can be used as insulators.Question 8: In order to keep down the inside temperature of an oil tank that is exposed to the sun, the outside of the tank should be painted a) white.b) brown.c)
.png)