OAR FREE OAR Mechanical Reasoning Question and Answers 2

Question 1

A hydraulic press has a small piston with an area of 2 sq in and a large piston with an area of 20 sq in. If a force of 15 lb is applied to the small piston, what force is exerted by the large piston?

Accepted Answer

150 lb

Answer

30 lb

Answer

300 lb

Answer

75 lb

Question 2

Two meshing gears have 12 and 36 teeth respectively. If the smaller gear rotates at 900 RPM, what is the speed of the larger gear?

Accepted Answer

300 RPM

Answer

2700 RPM

Answer

450 RPM

Answer

150 RPM

Question 3

A 200-lb crate sits on a surface with a coefficient of static friction of 0.4. What minimum horizontal force is needed to start moving the crate?

Accepted Answer

80 lb

Answer

40 lb

Answer

120 lb

Answer

200 lb

Question 4

In a first-class lever, the fulcrum is located 2 ft from the load and 6 ft from the effort. If the load weighs 150 lb, what effort is required to balance it?

Accepted Answer

50 lb

Answer

75 lb

Answer

450 lb

Answer

25 lb

Question 5

A block-and-tackle pulley system has 4 supporting ropes. Ignoring friction, what effort is needed to lift a 240-lb load?

Accepted Answer

60 lb

Answer

120 lb

Answer

80 lb

Answer

240 lb

Question 6

A spring with a constant of 30 lb/in is compressed 4 inches. How much potential energy is stored in the spring?

Accepted Answer

240 in-lb

Answer

120 in-lb

Answer

60 in-lb

Answer

480 in-lb