Power and Performance II Practice Test

These questions are part of the practice quiz. Start practicing

• Under a cold air induction system, horsepower increases by 1% for every 10º drop in intake air temperature. How much horsepower increase would result from a 20º drop in a 400 hp engine?
• Which component directly opens and closes the valves as the camshaft rotates?
• Which option increases velocity at very high speeds by diameter?
• Which component can extend or retract to determine proper pushrod length?
• Which circuit enriches the mixture for cold starting using a bi-metallic spring?
• A test where the vehicle operator ________ is called a fast acceleration run.
• Which component continuously draws fuel from the tank as the engine rotates?
• A chassis dynamometer is designed to simulate driving by placing the vehicle on rollers.
• Which type of draft pulls air in from the top of the carburetor?
• Which component uses a spring to change the amount of pressure in the system?
• The __________ adjusts fuel during changes in throttle.
• Contains one large plenum area with differing runner lengths?
• Which component assists in returning excess fuel to the tank?
• Which term describes a header feature that merges flow before entering the collector?
• Why should you check valve train clearances before fully running the engine?
• Which header arrangement corresponds to a 4-2-1 design?
• If you know that a carburetor concern occurs during a cold start, what circuit should you inspect first?
• A fast acceleration run analyzes performance during rapid throttle opening and RPM rise.
• Which parameter determines torque curve optimization in exhaust systems?
• A negative horsepower run measures parasitic loss in the vehicle.
• What tool is used to check the gap between the bucket and the cam lobe?
• Which header varies with modification to the specific application?
• Loosen the locking screw and adjust the nut to alter the amount of fuel in the bowl. Which adjustment is this?
• May be sodium-filled to dissipate heat.
• Which device adjusts fuel during throttle changes?
• Which lifting component requires periodic adjustments, but is very stable at high rpm ranges?
• A 60º decrease in incoming air temperature results in a 6% horsepower increase. For a 300 hp engine, how many horsepower more is that?
• The __________ should always be the same size or slightly larger than the cylinder head port diameter.
• Which component is a specific size, stamped with an offset?
• Chocks are strong wedges always placed on the front wheels.
• Mufflers may contain fiberglass or stainless steel mesh to absorb exhaust noise.
• Which aftermarket component is placed in the cam gear dowel hole to alter the cam timing?
• Often mounted to a single, solid shaft for increased alignment and stability.
• Which component prevents particles from damaging the fuel system?
• Before you start to check ignition timing, you should check for leaks and the overall condition of the engine.
• The statement 'In an all gears run, the driver accelerates through all of the gears' is true.
• Which system has a nozzle positioned at each intake port?
• Which intake configuration is known to improve exhaust emissions?
• Which dyno uses hydraulics to apply and remove load through the dyno software?
• Which component measures clearances as it depresses easily and doesn't bend the pushrod?
• Which circuit supplies fuel during idle and very light throttle openings by providing a separate fuel path?
• Which component contains slots with adjustment bolts?
• Bottle valves are all manual valves.
• Which header arrangement is designed to prevent reversion by using multiple diameters on each primary tube?
• Which carburetor circuit is primarily responsible for metering fuel using jets and the main venturi to feed the discharge nozzle?
• Which component in this carburetor system sprays fuel into the intake manifold?
• What term describes a low-cost collector welded into the header as a single tube?
• The venturi effect in a carburetor creates a pressure difference that assists in drawing fuel from the discharge nozzle into the airstream. True or false?
• In a roll on run, the vehicle operator ________.
• Which component atomizes a metered amount of air and fuel?
• Which circuit allows fuel to flow under the throttle plate when the plates are nearly closed?
• Which term refers to a tube feature that prevents wrinkles during bending?
• Which tool is used to measure small gaps in the valve train geometry?
• Under a cold air induction system, a 40º drop yields what percent horsepower increase?
• Which component allows changing the cam timing to three or nine different positions?
• Which header is typically shorter length, dimpled, and connects to emission control devices?
• Which component's durability can be enhanced by a double roller design?
• Which lifting component requires little maintenance because of the self-adjusting oil pressure that it contains?
• In an all gears run, the driver ________.
• Which header is most associated with exhaust gases being directed upward rather than collected?
• Increase the thickness of the ___________ if the valve lash is too large.
• Which circuit uses the main venturi or booster venturi and jets to meter fuel from the discharge nozzle?
• Which circuit uses a mechanically actuated squirter that activates with a sudden or aggressive movement of the throttle linkage?
• A constant speed test measures the speed of the vehicle against a set amount of time.
• Which system is typically only used on fuel injection systems?
• Which component assists in returning excess fuel to the tank?
• Valve lash is defined by the gap between which components?
• The statement 'A negative horsepower run measures parasitic loss in the vehicle' is true.
• What should you adjust if there is excessive fuel in the float bowl?
• A direct port wet system has a central metering valve for nitrous oxide and fuel.
• Plate systems are an alternative to direct port wet systems.
• Which component opens and closes the valves?
• Which type of noise-cancelling device commonly uses absorbing material around a single pipe?
• What describes the component that expands and contracts with temperature changes?
• Which header's primaries direct exhaust gases directly upward; do not use a collector?
• Which header prevents reversion with multiple diameters on each primary tube?
• After setting hydraulic lifter preload, tighten the ______ locking Allen screw.
• Which valve train component contains adjustment bolts that allow timing adjustment?
• Will be stiffer to better retract the valves.
• Excess fuel returns to the tank via the __________.
• Perform safety and vehicle checks before driving the vehicle onto the dyno.
• Entropy occurs when sound energy changes to heat energy.
• A collector with what characteristic increases velocity at higher speeds?
• Which component cuts off fuel delivery?
• If the main metering rod is bent, causing poor engine performance, what should you do?
• Which statement best describes the effect of a longer collector on engine power range?
• Oxygen sensors can be used to record air/fuel ratio data.
• Snap the throttle quickly and listen to ensure that the engine does not hesitate.
• Which component blocks the main jet during cranking, creating rapid fuel pressure in the system?
• Dynos frequently get out of calibration.
• Which component filters fuel before mixing with air?
• Which technology helps increase exhaust velocity by retaining heat within the primaries?
• Which circuit provides additional fuel for cold start-up with a bi-metallic spring?
• Allow the T-bucket to self-center before making a full dyno pull.
• Which component rotates the inner mark to adjust and align with the desired timing mark?
• In a carburetor, air flowing through the air horn and venturi creates a difference in what property between the fuel entry ports and the float bowl?
• Racetracks are the only locations without noise regulations.
• Align the drive axle over dyno drums.
• Draws fuel from the tank.
• Which component is mechanically driven to provide fuel to the carburetor?
• Which lifting component is most commonly associated with precision valve actuation and is fully hydraulic in some designs?
• A __________ collector improves low-to mid-range power.
• Sprays fuel into the intake manifold.
• Tighten or loosen the screws in order to adjust the air/fuel ratio or achieve the highest vacuum reading.
• Which component is designed as a single, heavy piece replacing multiple-part ball-type lifters?
• Direct port wet systems have the simplest design.
• The ignition system fires a spark plug before the piston reaches which position?
• The statement 'Dynos frequently get out of calibration' is true.
• Mufflers are designed primarily to reduce exhaust noise.
• Which intake manifold design provides the lowest restriction from the intake manifold to the cylinder head?
• If valve lash is too large, which part's thickness should be increased?
• The statement 'Secure the drive wheels with chocks' is true.
• Which term is associated with a 4-2-1 header arrangement?
• The statement 'Place wheel covers over the non-drive wheels' is true.
• Which configuration improves airflow, but may cause unequal fuel distribution?
• Which symptom occurs if the carburetor to manifold base plate gasket does not seal?
• Total timing rate is obtained at what engine condition?
• Which component may be offset to re-position the pushrod for intake runner modifications?
• Which type of lifting component is used on overhead cam engines to directly actuate the valves?
• Connect the testing equipment before driving the vehicle onto the dyno.
• Which header is described as 'typically shorter length, dimpled, and connects to emission control devices'?
• Direct port wet systems have the simplest design.
• Ignition timing refers to the relationship between when the spark occurs and the position of the which component?
• Which bypass valve blocks fuel flow to the main jet to build pressure during cranking?
• What feature on a tube ensures smooth exhaust flow by avoiding wrinkles during bending?
• Secure the drive wheels with chocks.
• What can you do to prevent damage to the pushrod when measuring pushrod clearance?
• A collector with what feature increases velocity at lower engine speeds?
• Which collector type contains a goilet and venturi to transition exhaust gases?
• Which component may be a double roller style for increased durability?
• In a scenario where two technicians discuss ignition timing, which statement is correct?
• Which component contains a fuel level sending unit to determine fuel level?
• Which type of dyno consists only of rollers and does not use a power absorber?
• The __________ should always be the same size or slightly larger than the cylinder head port diameter.
• Technician A says that installing a thicker spacer in the high speed poppet valve makes the engine run lean at higher rpm. Technician B says that if a larger main jet is installed to accommodate fuel delivery over 6500 rpm, fuel would run lean at low rpm. Which technician is correct?
• Which header is described as 'varies with modification to the specific application'?
• You can use an oxygen sensor at the tailpipe to record air/fuel ratio data.
• Which component directs fuel to the nozzles?
• Which type of dyno uses hydraulics to add and subtract load through the dyno software?
• In ignition timing, the spark occurs before the piston reaches TDC.
• Nitrous oxide is 36% oxygen by mass.
• Which component removes contaminants from fuel before it reaches the engine?
• Which circuit uses a metering rod or vacuum-operated jet valve that opens as manifold vacuum drops with added load?
• Entropy in acoustics describes the transformation of sound energy into heat energy.
• Which component, when installed, allows the cam timing to be adjusted by rotating and aligning with a timing mark?
• Which system operates by using a simple fogger-style nozzle to deliver fuel and nitrous into the induction system?
• An inertia dynamometer provides load changes without using a dedicated power absorber.
• Which component is often a one-piece, heavier component that replaces the multiple-part ball types?
• Which feature is described by tapered runners angled toward the cylinder head to improve high-RPM airflow?
• Which valve is commonly filled with sodium to improve heat dissipation from the valve stem?
• Which type of dyno is most able to add and subtract load quickly?
• Which component is used to adjust cam timing by rotating to align marks and selecting different timing positions?
• Which collector characteristic improves mid- to high-range rpm power?
• Which component uses multiple keyways, typically three or nine?
• The restriction method involves routing the gases through multiple turns.
• Which intake configuration is best for low or mid speed applications?
• What circuit discharges fuel through a slot-shaped port just above the throttle plate during low-speed operation?
• Noise regulations are typically enforced at most racing venues.
• Which component is designed to adjust cam timing through slots and adjustment bolts?
• Which component is placed in the cam gear dowel pin-hole?
• Correction factors are used to account for changes in operating conditions.
• What is the primary purpose of a collector?
• The statement 'Connect the testing equipment before driving the vehicle onto the dyno' is true.
• Which component filters air before being atomized with fuel?
• The material indicates coverage of which chapters?
• Which component's thickness should be increased to reduce valve lash when it is too large?
• Which exhaust modification involves routing gases through multiple turns?
• Ignition timing is determined by the crankshaft position.
• Which ram tube length is typically associated with greater high-speed performance in drag racing?
• Replace, as necessary, with the correct sizes to adjust the air/fuel ratio at cruise or under power.
• Installing a thicker spacer in the high-speed poppet valve is expected to cause the engine to run lean at higher rpm. Which option best describes this effect?
• Which type of noise-cancelling device uses absorbing material surrounding a single pipe?
• A plate system is an alternative to a direct port wet system.
• The resonation method involves using sound waves against themselves.
• Which component is most closely associated with coordinating the opening and closing of valves and is commonly mounted on a single shaft for stability?
• After lifter preload adjustment, which screw is used to lock the setting?
• If a larger main jet is installed to accommodate fuel delivery over 6500 rpm, fuel would run lean at low rpm. This statement describes what outcome?
• Which term describes a cheap header option formed as a single tube?
• Which design uses tapered runners angled more directly toward the cylinder head to improve airflow at high RPM?
• Which circuit controls the fuel available to the carburetor with a needle valve?
• Which valve is primarily responsible for metering fuel into the nozzle lines?
• Which valve serves to bypass fuel away from the main jet to help build pressure during crank?
• Place wheel covers over the non-drive wheels.
• Immediately turn off the engine if the reading is too high.
• Which header quickly bolts on and off and contains bungs and connections for exhaust?
• Which type of noise-cancelling device uses the theory of entropy to reflect the sound waves against each other?
• Adjust the throttle blade gap to control idle speed. Which parameter is adjusted?
• During cranking, which bypass valve blocks fuel flow to the main jet to build pressure?
• Which type of ram tube typically allows a dragster to achieve greater performance at high speeds?
• Which component meters and delivers fuel to the nozzles?
• Which arrangement typically employs multiple carburetors to maximize air and fuel delivery?