ASVAB ASVAB Certifications ASVAB-SECTION-3 Questions & Answers

• Question 141:

  A yellow flame on a gas furnace indicates __________.

  A. Everything is fine.

  B. The fuel-air mixture is too rich.

  C. The fuel-air mixture is too lean.

  D. The gas pressure is too low.

  Correct Answer: B

  A yellow flame indicates too much fuel or not enough air. More air should be allowed to enter and mix with the gas. Thus, the fuel-air mixture is too rich.

• Question 142:

  

  For the fuel to travel from Reservoir A to Reservoir B, passing through Filters C and D on the way, which valves must be open?

  A. 1, 2, 4, and 8

  B. 1, 2, and 3

  C. 6, 7, and 8

  D. 4, 6, and 7

  Correct Answer: A

  Opening Valves 1, 2, 4, and 8 allows the fuel to travel through the filters.

  Opening Valves 1, 2, and 3 doesn't allow the fuel to travel through the filters.

  Opening Valves 6, 7, and 9 doesn't allow the fuel to travel through the filters.

  Opening Valves 4, 6, and 7 will allow fuel to travel through the filters but not to Reservoir B.

• Question 143:

  

  If Gear 1 makes 10 complete clockwise revolutions per minute in the figure above, then __________.

  A. Gear 2 makes 10 complete clockwise revolutions per minute.

  B. Gear 2 makes 20 complete counterclockwise revolutions per minute.

  C. Gear 2 makes 5 complete counterclockwise revolutions per minute.

  D. Gear 3 keeps Gear 2 from making any revolutions.

  Correct Answer: B

  If Gear 1 turns at 10 rpm, then Gear 2, which is half the size, turns twice as fast at a rate of 20 rpm.

• Question 144:

  

  If Gear A turns left in the figure above, Gear B __________.

  A. won't turn

  B. turns left

  C. turns right

  D. It can't be determined.

  Correct Answer: C

  Gears in mesh always turn in opposite directions.

• Question 145:

  

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

  Which valves need to be closed for the tank to fill up completely?

  A. 3 and 4 only

  B. 3, 4, and 5

  C. 2, 3, and 4

  D. 4 only

  Correct Answer: A

  Closing only Valves 3 and 4 keeps the water from leaving the tank.

• Question 146:

  

  In the figure above, for each complete revolution the cam makes, how many times will the valve open?

  A. 1

  B. 6

  C. 3

  D. 2

  Correct Answer: C

  The valve will open each time a high point of the cam hits it. The cam has three high points, so the valve will open three times per revolution.

• Question 147:

  

  In the figure shown above, what effort E must be applied to lift the cat?

  A. 7.0 pounds

  B. 9.0 pounds

  C. 21.0 pounds

  D. 10.5 pounds

  Correct Answer: A

  Apply the leverage formula: Length of Effort Arm divided by Length of Resistance Arm = Resistance Force divided by Effort Force. Or: 9 ÷ 3 = 21 ÷ E (effort force) 3 = 21 ÷ E 3E = 21 ÷ E × E 3E = 21 3E ÷ 3 = 21 ÷ 3 E = 7

• Question 148:

  

  When the block-and-tackle arrangement shown in the figure above is used to lift a load, all the following parts remain stationary EXCEPT __________.

  A. the upper hook

  B. the upper block

  C. the lower block

  D. none; all the parts move

  Correct Answer: C

  All the listed parts remain stationary except the lower block.

• Question 149:

  

  The weight of the load is being carried on the backs of the two cats shown in the figure. Which cat is carrying the most weight?

  A. Cat A

  B. Cat B

  C. Both are carrying an equal amount of weight.

  D. It can't be determined without more information.

  Correct Answer: A

  The load is closer to Cat A, so he's carrying the greater portion of the weight.

• Question 150:

  Water in an engine can cause damage in winter weather because __________.

  A. it can vaporize

  B. water expands when it freezes

  C. ice is heavier than water

  D. cold water creates more steam than warm water

  Correct Answer: B

  Water expands when it freezes, possibly damaging engine components.