SACA - Smart Automation Certification Alliance Mechanical Power Transmission Questions and Answers

Question 1

A motor operates at 1800 RPM and is connected to a simple gearbox.
The drive gear on the motor shaft has 20 teeth, and the driven gear on the output shaft has 80 teeth.
What is the approximate output speed of the gearbox?

Accepted Answer

450 RPM

Answer

1800 RPM

Answer

7200 RPM

Answer

900 RPM

Question 2

Which of the following is a primary advantage of using a synchronous (timing) belt drive system compared to a standard V-belt drive?

Accepted Answer

Positive, slip-proof engagement for precise positioning

Answer

Greater ability to absorb shock loads

Answer

Lower operational noise at all speeds

Answer

Less expensive and more readily available sprockets

Question 3

What is the primary function of a flexible shaft coupling, such as a jaw or grid coupling, in a mechanical power transmission system?

Accepted Answer

To accommodate for minor parallel and angular misalignment between shafts

Answer

To provide a perfectly rigid connection with zero backlash

Answer

To significantly increase the torque transmitted between shafts

Answer

To act as a mechanical fuse that fails during an overload

Question 4

During a routine inspection, a technician notes a loud, high-pitched grinding noise originating from a pillow block bearing on a conveyor line. The noise increases with the speed of the conveyor. Which of the following is the most likely cause?

Accepted Answer

Contamination or lack of lubrication in the bearing

Answer

Improper V-belt tension

Answer

A loose shaft key

Answer

Motor soft foot

Question 5

When performing preventative maintenance on a roller chain drive, which of the following are the two most critical parameters to check and adjust to ensure maximum operational life?

Accepted Answer

Chain lubrication and proper tension

Answer

Sprocket material hardness and color

Answer

Ambient air temperature and humidity

Answer

Direction of chain travel and motor voltage

Question 6

A V-belt drive is configured to transmit power from a small, high-speed motor pulley to a large driven pulley on a low-speed, high-load industrial mixer. Which of the following correctly describes the change in speed and torque at the driven shaft?

Accepted Answer

Speed is decreased and torque is increased

Answer

Speed is increased and torque is decreased

Answer

Speed is decreased and torque is decreased

Answer

Speed is increased and torque is increased