Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 31, Problem 12RQ
True or False: All gas valves snap open and closed.
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Chapter 31 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 31 - The four types of gas furnace airflow patterns are...Ch. 31 - Describe the function of a multipoise or...Ch. 31 - Describe the function of a draft safeguard switch.Ch. 31 - Where are auxiliary limit switches used in heating...Ch. 31 - The specific gravity of natural gas is A. 0.08. B....Ch. 31 - Prob. 6RQCh. 31 - The pressure at the manifold for natural gas is...Ch. 31 - Prob. 8RQCh. 31 - The typical manifold pressurefor propane gas...Ch. 31 - Why is excess air supplied to all gas-burning...
Ch. 31 - Prob. 11RQCh. 31 - True or False: All gas valves snap open and...Ch. 31 - Which of the following features does an automatic...Ch. 31 - What is the function of the servo pressure...Ch. 31 - What is a redundant gas valve?Ch. 31 - Prob. 16RQCh. 31 - Prob. 17RQCh. 31 - Prob. 18RQCh. 31 - Prob. 19RQCh. 31 - What is an integrated furnace controller (IFC)?Ch. 31 - What is meant by the warm-air blower's off-delay...Ch. 31 - What are dual-in-line-pair (DIP) switches?Ch. 31 - Prob. 23RQCh. 31 - Describe the two types of pilot lights.Ch. 31 - True or False: A thermocouple develops direct...Ch. 31 - Describe how a thermocouple flame-proving system...Ch. 31 - Prob. 27RQCh. 31 - Describe how a liquid-filled flame-proving system...Ch. 31 - Prob. 29RQCh. 31 - Describe a flame rectification flame-proving...Ch. 31 - Prob. 31RQCh. 31 - Describe the difference between a single-rod...Ch. 31 - Prob. 33RQCh. 31 - Prob. 34RQCh. 31 - Prob. 35RQCh. 31 - Prob. 36RQCh. 31 - Define the dew point temperature as it applies to...Ch. 31 - Prob. 38RQCh. 31 - Prob. 39RQCh. 31 - What are four factors that determine the...Ch. 31 - What is a 100% shutoff system?Ch. 31 - What is the difference between a hard and a soft...Ch. 31 - Prob. 43RQCh. 31 - When would a combustion blower ever interpurge a...Ch. 31 - Prob. 45RQCh. 31 - An orifice is a drilled hole in a _______.Ch. 31 - A______ distributes gas to the various burners.Ch. 31 - True or False: An orifice measures the quantity of...Ch. 31 - Prob. 49RQCh. 31 - The ________transfers heat from the hot gas to the...Ch. 31 - Name two types of fan switches.Ch. 31 - Prob. 52RQCh. 31 - Prob. 53RQCh. 31 - Describe how a two-stage furnace operates.Ch. 31 - Describe how a modulating furnace operates.Ch. 31 - What is a variable-output programmable thermostat?Ch. 31 - Why is a metal vent often preferred rather than a...Ch. 31 - Prob. 58RQCh. 31 - Describe why you should never use a flame to leak...Ch. 31 - Prob. 60RQCh. 31 - A _____________sample is taken from the flue gas...
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- Pressure relief valves: Select one: a. Open manually upon overloading in pressure O b. Open automatically upon overloading in pressure c. Two directional valve d. Oil flow control valvearrow_forwardWhat is a redundant gas valve?arrow_forwardTrue or False: An orifice measures the quantity of gas to the burner as well as directs the gas stream.arrow_forward
- Why must the oxygen cylinder valve be opened all the way to the top?arrow_forwardA _____________sample is taken from the flue gas tocheck the efficiency of a gas furnace.arrow_forwardTrue or false flow rate control valve is the type of valve which is used to control the speed of an actuatorarrow_forward
- A valve may be operated by any of the following except? a. none of the choices b. electronically c. mechanically d. manuallyarrow_forwardA 2 inch-diameter horizontal jet of water with a velocity of 20 ft/s relative to the ground strikes a flat plate that is attached to a car moving at a velocity of Ve. After it hits, the water splatters in all directions in the plane of the plate. Investigate the effect of the car velocity V. on the force exerted on the plate.arrow_forwardCavitation and flashing are two different phenomena that should be avoided in the valve operation. Question : Define the term cavitation and flashing.arrow_forward
- the metring valve portion of combination valve fails .technician A says that this means the entire combination valve must be replaced.Technician B says that the metring part can be repaired who is correct?arrow_forwardis a type of safety valve used to control or limit the pressure in a system. Select one: O a. On and off valve O b. One way flow control valve O . Shutoff valve O d. Pressure relief valvearrow_forwardPressure control valves determine maximum system pressure True Falsearrow_forward
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