SIFT Mechanical Comprehension Questions and Answers 3

Question 1

If a wheel with radius 3 feet is connected to an axle with radius 1 foot, what is the mechanical advantage?

Accepted Answer

3

Answer

0.33

Answer

1

Answer

9

Question 2

What happens to the speed of a fluid when it flows from a wider pipe into a narrower pipe (Bernoulli's principle)?

Accepted Answer

Speed increases and pressure decreases

Answer

Speed decreases and pressure increases

Answer

Speed and pressure both increase

Answer

Speed and pressure both decrease

Question 3

In a series electrical circuit with two resistors of 4Ω and 6Ω connected to a 20V battery, what is the total current?

Accepted Answer

2 A

Answer

0.5 A

Answer

5 A

Answer

10 A

Question 4

What does a 'shear pin' do in a mechanical system?

Accepted Answer

Intentionally breaks under excessive load to protect more expensive components

Answer

Aligns two shaft sections precisely

Answer

Increases friction between moving parts

Answer

Transmits power from an engine to a transmission

Question 5

A ramp (inclined plane) is 10 feet long and 2 feet high. What is the mechanical advantage?

Accepted Answer

5

Answer

0.2

Answer

2

Answer

10

Question 6

What is the primary function of a flywheel in a mechanical system?

Accepted Answer

To store rotational kinetic energy and smooth out speed fluctuations

Answer

To change the direction of power flow

Answer

To increase the gear ratio of a transmission

Answer

To regulate fluid pressure in a hydraulic system