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Worksheetsengine repair 2 final exam review
Total questions: 39
Worksheet time: 20mins
What is the main function of the engine block in an internal combustion engine?
To provide lubrication to engine parts
To serve as the main structure and mounting surface for all components
To cool the engine by circulating coolant
To increase the engine's horsepower
What materials are increasingly used for engine blocks to reduce weight and increase fuel efficiency?
Steel alloys
Aluminum alloys
Plastic composites
Cast iron
What components are included in the engine block assembly's lower end?
Carburetor and air filter
Oil galleries, pistons, and connecting rods
Turbocharger and exhaust manifold
Fuel injectors and spark plugs
What is the purpose of ribs, webs, and fillets in an engine block?
To reduce noise
To provide reinforcement and strength
To increase fuel efficiency
To improve aerodynamics
What do main bearing caps support in an engine?
The camshaft
The crankshaft
The pistons
The fuel injectors
How are cylinders typically integrated into the engine block?
Machined into the block or made of a cast iron sleeve
Welded onto the block
Attached with bolts
Glued into place
What is the role of the piston in an engine?
To cool the engine
To transfer power stroke force to the crankshaft
To lubricate the cylinder walls
To ignite the fuel-air mixture
What components are included in the piston assembly?
Head, skirt, pin, and connecting rod
Crankshaft and camshaft
Oil pump and water pump
Spark plugs and fuel injectors
What causes piston slap in an engine?
Excessive oil pressure
Too great a clearance between the piston and the cylinder wall
Insufficient fuel mixture
Overheating of the engine
What is the purpose of cam-ground pistons being slightly oval shaped?
To increase compression ratio
To accommodate heat expansion
To reduce friction
To improve fuel efficiency
What does the term "compression ratio" refer to in an engine?
The difference in piston size
The difference in fuel types
The difference in volume of the combustion chamber at BDC and TDC
The difference in engine speed
How can the compression ratio be changed?
By altering the fuel type
By changing the shape of the piston head
By adjusting the engine speed
By modifying the exhaust system
What is the typical range for stock compression ratios?
5:1 to 7:1
8:1 to 10.5:1
11:1 to 13:1
14:1 to 16:1
What is a characteristic of pistons manufactured by forging?
Less expensive but weaker
More expensive but stronger
Lighter but less durable
Heavier but more efficient
What material can piston heads be coated with?
Aluminum
Ceramic
Steel
Plastic
What must piston compression rings have?
Appropriate end gap, back clearance, and ring tension
High temperature resistance
Low weight
High flexibility
What shapes can connecting rods be?
Circular or square
H- or I-beam shaped
Triangular or hexagonal
Oval or rectangular
What is the function of the crankshaft in an engine?
To increase fuel efficiency
To transform piston stroke power into rotary motion
To reduce engine noise
To cool the engine
What do main bearing journals do in a crankshaft assembly?
Increase engine speed
Center the crankshaft at the bottom of the engine block
Reduce engine weight
Enhance fuel combustion
How can crankshafts be balanced?
Using counterweights
By reducing weight
By increasing length
Using magnets
What is the purpose of a thrust bearing in an engine?
To increase engine speed
To limit end play movement of the crankshaft
To reduce fuel consumption
To enhance engine sound
What is the function of an oil hole in the main bearing saddle?
To increase engine power
To allow oil from the oil gallery to lubricate the main bearings
To reduce engine noise
To enhance fuel efficiency
What are newer bearings coated with?
Aluminum
PTFE (polytetrafluoroethylene)
Steel
Copper
What component is used in a manual transmission to store rotational energy?
Flywheel
Flexplate
Torque converter
Harmonic balancer
Which component reduces vibration from the piston and crankshaft assembly?
Flywheel
Harmonic balancer
Crankshaft seal
Balance shaft
What is the primary function of crankshaft seals?
Reduce engine vibrations
Contain lubricating oil
Store rotational energy
Reduce piston friction
What do balance shafts use to reduce second-order vibrations?
Flywheels
Counterweights
Harmonic balancers
Crankshaft seals
Which part of the engine block assembly helps to direct coolant flow around the cylinders?
Oil pan
Water jacket
Timing chain cover
Valve cover
What is the main purpose of the connecting rod in an internal combustion engine?
To regulate fuel injection
To ignite the air-fuel mixture
To transfer motion from the piston to the crankshaft
To cool the engine oil
Which material is commonly used for manufacturing crankshafts due to its strength and durability?
Cast iron
Aluminum
Forged steel
Plastic
Which part connects the piston to the crankshaft in an engine?
Oil pan
Flywheel
Camshaft
Connecting rod
What is the main function of piston rings?
To ignite the air-fuel mixture
To seal the combustion chamber and control oil consumption
To cool the engine block
To increase engine speed
Which material is commonly used for manufacturing crankshafts?
Glass
Rubber
Cast iron
Plastic
Which part of the engine block assembly helps to minimize friction between moving parts?
Oil galleries
Water jacket
Timing chain
Valve cover
What is the main function of the flywheel in an internal combustion engine?
To control valve timing
To increase fuel efficiency
To store rotational energy and smooth engine operation
To regulate engine temperature
Which feature of the engine block provides additional support to withstand combustion forces?
Ribs and webs
Exhaust manifold
Timing belt
Oil pan
Which part of the engine block provides support for the crankshaft and absorbs combustion forces?
Camshaft bearings
Oil pan
Piston rings
Main bearing caps
What is the primary purpose of counterweights on a crankshaft?
To enhance fuel injection
To store lubricating oil
To balance rotating assembly and reduce vibration
To increase engine temperature
Which component prevents oil from leaking out at the ends of the crankshaft?
Flywheel
Crankshaft seal
Thrust bearing
Connecting rod
