Blower - Study guides, Class notes & Summaries

How DC motors operate? Magnetic lines of force are continuous and always form closed loops; Magnetic lines of force do not cross. Armature: (Definition) The rotating windings of a DC motor. The ____ is a movable electromagnet located between the poles of another fixed permanent (field) magnet as shown. Armature A twisting force called ______ must be developed. _____ is produced by mounting a loop in a fixed magnetic field and as long as the fields of the magnet and armatu...

HVAC NATE Gas Heat Exam Prep (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A Q: When starting up a dual system, the temperature rise method for determining airflow cannot be used with compressor cycle of the heat pump because: Answer: The capacity of the system varies too much with outdoor temperature. Q: The flame pattern a technician would expect to see on a properly operating single stage gas furnace equipped with "in shot" type burner is a:...

BPI Building Analysist Technician (Health And Safety, Electrical, Blower Door) Questions And Answers Radon Correct answer odorless, colorless, radioactive lung cancer Correct answer primary health risk of radon cracks in concrete, sump pump Correct answer Discuss two potential sources or entry points in the home for radon Correct answer How to detect radon in a home popcorn ceiling, siding Correct answer Two common building materials that might contain asbestos

Compressors, Fans, and Blowers Test Questions with Answers The flow of air or gas is carried by the __________ created by the energy transmitted to the gas by the rotating wheel - Answer-pressure differential If no resistance to flow exists, no inlet and outlet duct, the fan provides the gas with ________ only, and no compression or rarefaction occurs. - Answer-velocity energy It consists of an impeller of the squirrel-cage type, operating within a scroll-type housing and including drivi...

Compressors and Blowers Test Questions with All Correct Answers types of reciprocating compressors - Answer-single-stage- uses a single cylinder and compresses once mult-istage - compresses more than once depending on the number of cylinders Filters - Answer-placed before the inlet pipe to trap dust and other foreign materials from entering compressor, use cloth or metal material lubricating systems - Answer-lube oil system- low pressure, oil resevoir, pump, filters, coolers forced...

Troubleshooting Pumps, Compressors and Blowers Exam Questions with Answers The presence of solids on seal faces of a centrifugal pump is an indication of: a. Lubricating oil leak. b. Seal leak. c. Cavitation. d. Worn-out bearing. - Answer-b Insufficient oil in the Trico oiler of na pump indicates: a. Gas bubbles in the casing. b. Failure of seal oil cooling. c. Wear and tear of bearing. d. Leak in the oil fittings. - Answer-d Loose crosshead in a reciprocating pump can be detecte...

Sociology - Dr Blowers – NNU – Previous Exam Questions with 100% Correct Answers | Verified | 2024

HVAC Gas Heat Certification Exam Prep (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A Q: Why is excess air supplied to all gas-burning appliance burners? Answer: to ensure that there is enough air all all times. Q: The purpose of a gas regulator at a gas burning appliance is to? Answer: B. decreases the pressure to the burner Q: Ture or False: All gas valves snap open and closed. Answer: False Q: Which of the followin...

HVAC NATE Gas Heat Exam Prep (Latest 2024 / 2025 Update) 100% Correct Questions and Verified Answers | Grade A Question: Differential pressure gauge (also called a manometer) is used to... Answer: Measure duct static pressure Question: A line voltage fuse is used to protect from... Answer: Excessive voltage Question: Forced air residential/ light commercial gas furnaces provide heat by... Answer: Circulating air across the heat exchanger Question: No mechanical fasten...

Screw compressors and Lobe Blowers Questions with Answers What are the 3 main types of capacity control used on screw compressors? - Answer-- Suction throttling - Rotating speed - Displacement control What is the most common method of suction throttling control? - Answer-Load/ No load What are the 2 modes of the load/no load control and what are the positions of the inlet valve on each? - Answer-Mode 1: Fully loaded/ open inlet valve Mode 2: Fully unloaded/ Closed inlet valve Wha...