OAR OAR Mechanical Reasoning 3

Question 1

A car engine produces 200 foot-pounds of torque at 3,000 RPM. What is the horsepower output? (1 HP = 5,252 ft-lb/min at 1 RPM)

Accepted Answer

About 114 HP

Answer

About 57 HP

Answer

About 171 HP

Answer

About 228 HP

Question 2

A fixed pulley system redirects force but offers no mechanical advantage. Adding a second movable pulley creates a system with a mechanical advantage of:

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 3

Which material expands the MOST when heated to the same temperature increase?

Accepted Answer

Aluminum

Answer

Steel

Answer

Concrete

Answer

Glass

Question 4

A ball is thrown horizontally from a cliff at 20 m/s. Ignoring air resistance, how does its horizontal velocity change as it falls?

Accepted Answer

It remains constant

Answer

It increases due to gravity

Answer

It decreases due to air drag

Answer

It first increases then decreases

Question 5

A pipe joint is leaking because the threads are stripped. The BEST immediate repair approach is to:

Accepted Answer

Wrap Teflon tape over the threads and retighten

Answer

Apply epoxy putty to seal the leak from outside

Answer

Replace the entire pipe section

Answer

Tighten the joint further with more torque

Question 6

An electric motor draws 10 amperes at 120 volts. What is its power consumption?

Accepted Answer

1,200 watts

Answer

12 watts

Answer

120 watts

Answer

12,000 watts

Question 7

Two objects of different masses are dropped simultaneously from the same height in a vacuum. Which lands first?

Accepted Answer

They land at the same time

Answer

The heavier object

Answer

The lighter object

Answer

It depends on their shape