Chapter 9 & 10 Questions
After removing the vehicle's hood in preparation for removing the engine: Technician A places the hood on the roof of the vehicle. Technician B sets the hood aside in a safe place on fender covers or cardboard. Who is correct?
d
Parts must be ________ when they go into an abrasive blast machine. a. Wet b. Dry c. Grease-free d. Both b and c
d
Which of the following is an expression of how much of the heat formed during the combustion process is available as power from the engine? a. Mechanical efficiency b. Engine efficiency c. Volumetric efficiency d. Thermal efficiency
d
Technician A says that if an engine has good results from a compression test, it will have good results from a cylinder leakage test. Technician B says that if an engine had good results from a cylinder leakage test, it will have good results from a running compression test. Who is correct?
Neither
A vehicle is producing a sharp, metallic rapping sound originating in the upper portion of the engine. It is most noticeable during idle. Technician A diagnoses the problem as piston pin knock. Technician B says that the problem is most likely a loose crankshaft thrust bearing. Who is correct?
Technician A
While determining the cause for air leaking out of the throttle body during a cylinder leakage test: Technician A says that a burnt intake valve is indicated. Technician B says that a warped cylinder head or bad head gasket is indicated. Who is correct?
Technician A
While determining the most likely problem of an engine with poor compression test results but acceptable cylinder leakage readings: Technician A says that the problem may be incorrect valve timing. Technician B says that that the problem is worn valve seats. Who is correct?
Technician A
Technician A says head gasket thickness has an effect on compression ratio. Technician B says connecting rod length has an effect on compression ratio. Who is correct?
Technician B
While conduction an engine vacuum test: Technician A says that a steady low vacuum reading can be caused by a burned in valve. Technician B says that an overall low vacuum reading is caused by something that affects all of the engine's cylinders. Who is correct?
Technician B
While diagnosing the cause for an engine having good results from a compression test and cylinder leakage test but poor results from a cylinder power balance test: Technician A says that incorrect valve timing is the most likely cause. Technician B says that a severely worn cam lobe is a likely cause. Who is correct?
Technician B
While discussing piston slap: Technician A says that it is a high-pitched clicking that becomes louder during deceleration caused by detonation. Technician B says that it is the noise made by the piston when it contacts the cylinder wall due to excessive clearances. Who is correct?
Technician B
While looking at the results of an oil pressure test: Technician A says that higher than normal readings can be caused by using oil that is too thin. Technician B says that higher than normal readings can be expected on a cold engine. Who is correct?
Technician B
Hydrocarbon solvents are ________ . a. Flammable b. Toxic c. Both a and b d. Neither a nor b
b
The stroke of an engine is the ________ crank throw. a. Half b. Twice c. Four times d. Equal to
b
Which of the following is not considered part of the organic soil grouping? a. By-products of combustion, including carbon, varnish, gum, and sludge. b. Rust that is a product of coolant and aluminum. c. Coatings, including such items as rust-proofing materials, gasket sealers and cements, paints, waxes, and sound-deadener coatings. d. Petroleum by-products derived from crude oil, including tar, road oil, engine oil, gasoline, diesel fuel, grease, and engine oil additives. Hide Feedback
b
True or False? In an HCCI engine, combustion immediately and simultaneously produces a steady flame across the mixture.
false
True or False? SAE mandates that engine, when viewed from the front, will be rotating in a counter-clockwise direction.
false
True or false? On may FWD vehicles, the suspension system must be partially disassembled to remove the radiator.
false
An engine block should be mounted to an engine stand using a minimum of ________ bolts. a. Four b. Six c. Three d. Five
a
True or False? Many engines in FWD vehicles must be removed with the transmission still attached.
True
Which of the following statements about engines is not true? a. The engine provides the rotating power to drive the wheels through the transmission and driving axle. b. Only gasoline engines are classified as internal combustion. c. The combustion chamber is the space between the top of the piston and the cylinder head. d. For the combustion in the cylinder to take place completely and efficiently, air and fuel must be combined in the right proportions.
b
Technician A uses a crane to remove an engine from its compartment. Technician B uses an engine cradle to remove an engine from its compartment. Who is correct?
c
While discussing the common causes for cracks developing in a cylinder block or head: Technician A says that the chilling of a hot engine by a sudden rush of cold water or air over the surface may cause cracking. Technician B says that excessive overheating is a common cause. Who is correct?
c
While loosening the axle shaft hub nuts on FWD vehicle: Technician A says that a large breaker bar should be used to prevent damage to the bearings. Technician B says that these nuts should be loosened with the vehicle on the floor and brakes applied. Who is correct?
c
Which of the following statements is not true? a. When the engine is removed through the bottom of the vehicle, use an engine cradle and dolly to support the engine. b. If the manufacturer recommends engine removal through the hood opening, use an engine hoist. c. Regardless of the method of removal, the engine and transaxle in a FWD vehicle are usually removed as a unit. d. When removing an engine from RWD vehicle, suspension disassembly is often required.
d
While discussing abrasive cleaners: Technician A says that shot is angular in shape and is used for aggressive cleaning. Technician B says that grit is an angular-shaped media and is used to peen metal surfaces. Who is correct?
d