Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Textbook Question
Chapter 12, Problem 15RQ
Which of the following statements is not true?
- Normally the desired valve face-to-seat contact area for intake valves is 1 inch.
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What are the results and discussions in discussing the function of each component of the valve system?
Which of the following prevents rapid switching on and off control valves in pressure control systems?
a. compare actual pressure to the upper and lower limits
b. compare actual pressure to the desired pressure value
c. compare actual pressure to the center of the dead band
d. compare actual pressure to the maximum and minimum valve positions.
a) What is valve overlap? b) Why is some amount of valve overlap desirable?
c) Define the term zero overlap.
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Chapter 12 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 12 - Explain staged and continuously variable value...Ch. 12 - Define valve margin.Ch. 12 - What usually causes warpage in an aluminum cylin...Ch. 12 - What are the two ways pushrods can be checked for...Ch. 12 - Which of the following is not true of knurling? It...Ch. 12 - True False? Fiats MultiAir system relies on...Ch. 12 - To allow the engine to run on the Atkinson cycle,...Ch. 12 - Prob. 8RQCh. 12 - To ensure proper seating of the valve, the valve...Ch. 12 - When checking valve fit, contact between the valve...
Ch. 12 - If the valve face and valve seat do not contact...Ch. 12 - Many engines with WT have a phaser mounted to the...Ch. 12 - Multiple valve engines tend to be more efficient...Ch. 12 - Which of the following is not a type of valve...Ch. 12 - Which of the following statements is not true?...Ch. 12 - While discussing the reasons for resurfacing a...Ch. 12 - While inspecting the timing gears of an engine:...Ch. 12 - Technician A says that positive valve stem seals...Ch. 12 - When fitting a freshly ground valve into a freshly...Ch. 12 - Technician A says off-square springs may cause...Ch. 12 - Technician A says it is not necessary to measure...Ch. 12 - Technician A uses a 30-degree stone for topping a...Ch. 12 - While discussing the Valvetronic system:...Ch. 12 - While checking a hydraulic phaser after the...Ch. 12 - While servicing a pair of aluminum cylinder heads:...
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- To ensure proper seating of the valve, the valve seat must be. the correct width in the correct location on the valve face concentric with the guide all of the abovearrow_forwardWhich of the following is not a type of valve guide seal? Positive Negative Umbrella O-ringarrow_forwardWhat should you do if a valve does not move freely in its bore in the valve body?arrow_forward
- What is the 1G pipe position?arrow_forwardBriefly describe the types of piercing valves used in the industry, and list some advantages and disadvantages of both.arrow_forwardSelect the correct optionFormerly it was very common to determine the capacity of a valve; however, it is currently deprecated as it is unreliable a) Fluid directional limitb) Flow factorc) Compression ratiod) The diameter of its portsarrow_forward
- Which among the valves is called non return valve a.flap check b.ball c.plunger valve d.diaphragm e.Checkarrow_forwardWhat is the rotational travel through which both valves are closed? (in degrees)arrow_forwardWhat type of valve use simple discs, cones or balls are used in conjunction with simple valve seats to control flowarrow_forward
- Which of the following statements is not true? A direct acting PRV: Is complex in construction, therefore can malfunction if a very small dirt gets trapped inside the valve, which may result in safety hazard Offers uneven flow Does not provide precise pressure control Causes more wastage of HP compared to a compound one Which of the following basic system components has the primary function of removing the heat of compression from the air? Receiver Relief valve Pressure regulator Dryer Aftercooler Which of the following statements is true? A single acting cylinder may have two ports at two different ends and pressurized fluid can be directed to both of them A single acting cylinder with two ports will can be used as a double acting cylinder A single acting cylinder may have two ports at two different ends but into only one of the ports pressurized fluid is being directed A single acting cylinder…arrow_forwardWhen fitting a freshly ground valve into a freshly ground seat: Technician A says that the seat should be ground more with the same stone if the margin is too small. Technician B says that the seat should be ground more with the same stone if the valve seat is too high. Who is correct?arrow_forwardWhat is the rotational travel through which the intake valve is open? (in degrees)arrow_forward
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