NATE AIR DISTRIBUTION CORE QUESTIONS

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NATE AIR DISTRIBUTION CORE QUESTIONS

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Institution Nate Air Distribution

Course Nate air distribution

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NATE AIR DISTRIBUTION CORE QUESTIONS

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NATE AIR DISTRIBUTION CORE QUESTIONS

A fan - Answers- creates currents of air

motor driven centrifugal fan that delivers air to conditioned space under pressure -
Answers- blower

2 types of fans - Answers- 1 . Axial - fan axis parallel to air flow
2. Centrifugal - fan axis perpendicular to airflow

fans are classified in according to - Answers- direction of airflow

3 types of axial fans - Answers- propeller, tub axial, vane vial

3 common categories of centrifugal fans - Answers- radial, backward curved, forward
curved

Name the 4 of the variable the fan law uses to predict performance - Answers- RPM,
CFM, STATIC, DENSITY

efficiency of a fan - Answers- power output / power input

furnace cfm - Answers- btu output
-------------
1.1 x temp rise

wheel arrangement for forward curved centrifugal fans with wheel diameter 7" or less -
Answers- direct drive

wheel arrangement for forward curved centrifugal fans with wheel diameter 12" or more
- Answers- belt drive

how to change speed of belt driven fan - Answers- change belt pully

max torque a motor can develop without an abrupt drop in speed - Answers- locked
rotor torque

difference between actual speed and synchronous speed of motor - Answers- slip

effects of belts that are to tight - Answers- shortened bearing life, wasted power, noise

low velocity system operate less than - Answers- 2000 fpm

purpose of register - Answers- control velocity, flowrate and direction of airstream

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Uploaded on: January 2, 2025
Number of pages: 4
Written in: 2024/2025
Type: Exam (elaborations)
Contains: Questions & answers

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