FREE DAA Mechanical Comprehension: Gears and Cogs Questions and Answers

Question 1

If Gear A turns clockwise and is meshed directly with Gear B, which way will Gear B turn?

Accepted Answer

Counter-clockwise

Answer

Clockwise

Answer

It will not turn

Answer

In the same direction as Gear A

Question 2

A driver gear has 10 teeth and the driven gear has 40 teeth. What is the gear ratio?

Accepted Answer

4:1

Answer

1:4

Answer

1:1

Answer

10:40

Question 3

If a small gear drives a large gear, what is the effect on the output speed and torque of the large gear?

Accepted Answer

Speed decreases, torque increases

Answer

Speed increases, torque decreases

Answer

Speed and torque both increase

Answer

Speed and torque both decrease

Question 4

In a gear train, Gear A (driver) turns clockwise. It meshes with Gear B, which in turn meshes with Gear C. What direction does Gear C turn?

Accepted Answer

Clockwise

Answer

Counter-clockwise

Answer

It depends on the gear size

Answer

It will not turn

Question 5

A driver gear with 50 teeth rotates at 100 RPM. It drives a gear with 25 teeth. What is the rotational speed of the smaller gear?

Accepted Answer

200 RPM

Answer

50 RPM

Answer

100 RPM

Answer

400 RPM

Question 6

What is the primary purpose of a rack and pinion gear system?

Accepted Answer

To convert rotational motion to linear motion

Answer

To change the direction of rotation

Answer

To increase torque significantly

Answer

To disengage the drive shaft

Question 7

Two gears are meshed. Gear A has 60 teeth and Gear B has 20 teeth. For every one full rotation of Gear A, how many rotations does Gear B complete?

Accepted Answer

Three

Answer

One-third

Answer

One

Answer

Sixty