FREE NFST Test Mechanical Aptitude Questions and Answers

Question 1

If Gear 1 turns clockwise as indicated by the arrow, which of the following statements is true about Gear 3 and Gear 4?

Accepted Answer

Gear 3 turns counter-clockwise, and Gear 4 turns clockwise.

Answer

Gear 3 turns clockwise, and Gear 4 turns counter-clockwise.

Answer

Both Gear 3 and Gear 4 turn clockwise.

Answer

Both Gear 3 and Gear 4 turn counter-clockwise.

Question 2

A firefighter is using a pulley system to hoist a salvage cover weighing 100 lbs to a roof. The system consists of one fixed pulley at the top and one movable pulley attached to the load. Ignoring friction, what is the approximate force required by the firefighter to lift the cover?

Accepted Answer

50 lbs

Answer

100 lbs

Answer

75 lbs

Answer

25 lbs

Question 3

To achieve the greatest mechanical advantage when using a halligan tool to pry open a door, where should the firefighter apply force?

Accepted Answer

As far from the fulcrum as possible, at the end of the handle.

Answer

As close to the fulcrum (the door jamb) as possible.

Answer

At the midpoint of the tool's handle.

Answer

Directly on top of the fulcrum.

Question 4

A pumper is supplying a hose line to firefighters on the 5th floor of a building. If the pump operator increases the engine pressure, what is the primary effect on the water being delivered?

Accepted Answer

The velocity and reach of the water stream will increase.

Answer

The water temperature will decrease.

Answer

The diameter of the hose will expand significantly.

Answer

The amount of friction loss in the hose will decrease.

Question 5

Which of the following actions would increase the stability of an extension ladder that is set up against a building?

Accepted Answer

Widening the base of support by moving the base further from the wall (to a proper 4:1 ratio).

Answer

Increasing the angle so the ladder is almost vertical.

Answer

Placing the base of the ladder on an uneven surface.

Answer

Extending the fly section to its maximum height unnecessarily.

Question 6

If the small gear with 15 teeth makes 4 complete rotations, how many rotations will the large gear with 60 teeth make?

Accepted Answer

1 rotation

Answer

16 rotations

Answer

4 rotations

Answer

2 rotations