ASVAB ASVAB Certifications ASVAB-SECTION-3 Questions & Answers

• Question 171:

  

  If Gear A is turned to the left __________.

  A. Gear B turns to the right and Gear C turns to the left.

  B. Gear B turns to the left and Gear C turns to the left.

  C. Gear B turns to the right and Gear C turns to the right.

  D. Gear B turns to the left and Gear C turns to the right.

  Correct Answer: A

  Gears with their teeth together in mesh turn in opposite directions. Gear A turns Gear B in the opposite direction (right), and Gear B turns Gear C in the opposite direction (left).

• Question 172:

  

  In the figure above, assume the valves are all closed.

  To fill the tank, but to prevent it from filling entirely, which valves should be open?

  A. 1 and 2 only

  B. 1, 2, and 3 only

  C. 1, 2, and 4 only

  D. 1, 2, 3, and 5 only

  Correct Answer: D

  Opening Valves 1 and 2 allows water to enter the tank. Opening Valves 3 and 5 prevents water from filling the tank entirely. Opening Valve 4 allows water to leave the tank.

• Question 173:

  If a house key, a wooden spoon, a plastic hanger, and a wool jacket are all the same temperature, which one feels the coldest?

  A. key

  B. spoon

  C. hanger

  D. jacket

  Correct Answer: B

  The key will feel coldest because metal is a better conductor than the other materials.

• Question 174:

  

  In the figure above, if the cogs move up the track at the same rate of speed, Cog A will __________.

  A. reach the top at the same time as Cog B

  B. reach the top after Cog B

  C. reach the top before Cog B

  D. have greater difficulty staying on track

  Correct Answer: C

  The larger cog (Cog A) covers a greater linear distance in a given period of time.

• Question 175:

  

  The mechanical advantage of the block-and-tackle arrangement shown above is __________.

  A. 2

  B. 4

  C. 6

  D. 1

  Correct Answer: A

  Because this block-and-tackle arrangement merely changes the direction of the pull, it has a mechanical advantage of only 2.

• Question 176:

  A single block-and-fall is called a __________.

  A. fixed pulley

  B. gun tackle

  C. runner

  D. sheave

  Correct Answer: C

  A single block-and-fall is called a runner.

• Question 177:

  

  In the figure above, if the fulcrum supporting the lever is moved closer to the cat, the cat will be __________.

  A. easier to lift and will move higher

  B. harder to lift but will move higher

  C. easier to lift but will not move as high

  D. harder to lift and will not move as high

  Correct Answer: C

  If the fulcrum is moved closer to the cat, the length of the effort arm of the lever will be increased, making the cat easier to raise, but the height to which the cat can be raised will be reduced.

• Question 178:

  

  When Cam A completes one revolution, the lever will touch the contact point __________.

  A. once

  B. never

  C. four times

  D. twice

  Correct Answer: D

  When the high point of the cam connects with the lever arm, the lever arm will touch the contact point. Two high points on the cam mean the lever arm will touch the contact point twice with each revolution of the cam.

• Question 179:

  A clutch is a type of __________.

  A. universal joint

  B. coupling

  C. gear differential

  D. cam follower

  Correct Answer: B

  Clutches connect and disconnect parts, so they're a type of coupling.

• Question 180:

  Springs used in machines are usually made of __________.

  A. plastic

  B. bronze

  C. nylon fiber

  D. steel

  Correct Answer: D

  Machine springs are usually made of steel although sometimes they're made of brass or other metal alloys.