Free HVAC (C-20) practice test

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10 questions from the Peerless Institute C-20 HVAC exam. Covers load calculations, refrigerant handling, duct sizing, and efficiency ratings.

Study materials for this exam

Study Guide Peerless Study Guide Book: Heating, Ventilating & A/C (C-20) $120.00 Practice Test CSLB HVAC - Warm-Air Heating, Ventilating and Air-Conditioning (C-20) License: Practice Examination $120.00 Silver Package HVAC (C-20) Study Guide Book + Online Practice Exam $220.00 Gold Package HVAC (C-20) Study Guide Book and Online Practice Exam + Law and Business Online Practice Exam $320.00
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  1. 1Mr. Able is working on a 8' x 2.5' metal rolling scaffold that is six feet high. It has 6" rubber wheels and the floor has a 2 degree pitch. Mr. Able is finished at this location and needs to move to a different area. Mr. Able instructs his partner to move the scaffold to a different location while he is still on it. He has proceeded:(NOTE: In order to ride on staging, the floor surface must be within 3 degrees of level. When riding on staging, the minimum dimension of the base is at least 1/2 of the height.)

  2. 2How close to the ground can a metal duct be installed? (Ducts beneath concrete slab must be encased in at least 2 inches of concrete. )

  3. 3How many cfm are required if the heat loss of a room is 8,500 Btu, the register is 20 feet from the furnace, the temperature is 150 degrees bonnet and the design factor is 12.5?

  4. 4A duct has a design static pressure drop of .08" WC. The duct section is 160 feet long and the static pressure drop of the duct section is: (See Page 36 of the Test Booklet.)

  5. 5A grill in a distribution system must handle 1500 cfm of air at a face velocity of 500 fpm. The height of the duct must be 18 inches and the width of the grill is A. 28.4 inches.

  6. 6What is incorrect about the following statement? Duct material is to be made of zinc-coated sheets which will be not less than .5 ounce per square foot on both sides of a sheet. The coating will withstand flaking through bending of 180 degrees in any direction at room temperature.

  7. 7When pneumatic nailers and staplers are in use, all personnel, except tool operators, may not come within how many feet of the area?

  8. 8The volume of a room per 1000 Btu/h of aggregate input ratings for appliances must be a minimum of ______ cu. ft., according to the mechanical code.

  9. 9Metal ladders should be at least ___ feet from 220 volt electrical wiring.

  10. 10An office with dimensions 20' x 25' x 8' needs at least 4 air changes per hr. In order to have comfort standards, how many CFMs are necessary?