The speed of a belt driven ventilation fan...

Question 1 of 270705eccef9dbacbc34ba4d46069

The speed of a belt driven ventilation fan can be increased without changing the motor speed by using a __________.

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Question 1 of 27070

Q

The speed of a belt driven ventilation fan can be increased without changing the motor speed by using a __________.

🔍 Key Concepts

• belt and pulley speed relationship (how pulley diameter affects fan rpm) • difference between the drive pulley (on the motor) and the driven pulley (on the fan) • basic formula: smaller vs larger pulley and resulting speed of the driven component

💭 Think About

• If the motor speed stays the same, what has to change in the belt/pulley system to make the fan shaft turn faster? • Compare what happens to fan speed when you make the motor (drive) pulley larger versus smaller, assuming the belt speed equals the rim speed of the drive pulley. • Think about a bicycle: how do different gear sizes (front vs rear sprockets) affect how fast the rear wheel turns for one pedal revolution?

✅ Before You Answer

• Identify which pulley in the question is the drive pulley and which is attached to the fan. • Recall that belt linear speed at the rim is the same on both pulleys in steady operation. • Verify which change in drive pulley diameter will increase the rpm of the driven fan shaft when motor rpm is unchanged.