Small Engines Test Bank A

57. Which part of the engine must be removed before the push rods can be removed? a. rocker arms c. valve springs b. valves d. piston

A. Rocker arms

15. Valve tappet clearance is measured by using a: a. rule c. feeler gauge b. micrometer d. caliper

C. Feeler gauge

14. The valves open and close in a one-cylinder engine in as little as: a. 1/50 of a second c. 1/2 of a second b. 1/10 of a second d. 1 second

A. 1/50 of a second

94. The recommended cleaning interval for a single element air cleaner for small engines is every: a. 25 hours of operation c. 100 hours of operation b. 50 hours of operation d. week

A. 25 hours of operation

66. If black smoke is coming from the exhaust when the engine is operating at 3000 rpms the most probable cause is: a. a lean air-fuel mixture c. improper set ignition points b. an improperly installed breather d. a rich high speed air-fuel mixture

A. A lean air-fuel mix

7. The exhaust valve is made of: a. a very special steel c. brass b. copper d. carbide

A. A very special steel

99. When installing a paper air filter cartridge the paper side of the element should face __________ the engine. a. away from c. inside b. toward d. it doesn't matter

A. Away from

9. Valves have a direct effect on: a. compression c. compression ratio b. displacement d. horsepower

A. Compression

31. What causes valves to stick? a. gum accumulation c. wrong viscosity of oil b. old oil d. air filter clogged

A. Gum accumulation.

5. The intake valve is cooled by: a. incoming air/fuel mixture c. radiator b. air circulation d. oil

A. Incoming air/fuel mixture

70. According to Bernoulli's scientific principle as air speed __________ it's pressure __________. a. increases decreases c. decreases is reduced b. increases increases d. decreases decreases,

A. Increases, decreases

2. On the __________ stroke of an engine the piston is going down one valve is open and the other valve is closed and air and fuel are being drawn into the cylinder. a. intake c. power b. exhaust d. compression

A. Intake

24. The valve with the biggest size head is the: a. intake valve c. compression valve b. exhaust valve d. they are all the same size

A. Intake valve

90. The part of the engine that connects the air vane governor to the throttle shaft lever is called the: a. linkage c. tappet b. coil d. throttle body

A. Linkage

87. Which type governor works off of centrifugal force? a. mechanical c. pneumatic b. air vane d. diaphragm

A. Mechanical

88. Which type governor works off of flyweights? a. mechanical c. pneumatic b. air vane d. diaphragm

A. Mechanical

68. The term which does not represent a type of carburetor found on small gasoline engines is the: a. nozzle feed c. suction feed b. float feed d. diaphragm

A. Nozzle feed

49. When referring to a type of engine OHC stands for: a. overhead cam c. outside horizontal cam b. overhead crankshaft d. overhead carburetor

A. Overhead cam

46. In the ____________ arrangement the camshaft is installed in the crankcase and the valves are installed in the cylinder head. a. overhead valve c. straight valve b. overhead cam d. L-head

A. Overhead valve

100. The primary purpose of the ignition system is to: a. provide a spark at the spark plug. c. get a better flow of fuel to the cylinder. b. make the flywheel turn faster. d. make it easier to crank in cold weather.

A. Provide a spark at the spark plug

64. Which part of the carburetor controls engine speed? a. throttle c. choke b. venturi d. float

A. Throttle

77. A round disc mounted on a shaft in a carburetor that is located beyond the main fuel nozzle is called a/an: a. throttle c. choke b. adjusting needle d. venturi

A. Throttle

39. What is another name for a valve tappet? a. valve lifter c. valve shaft b. valve lobe d. valve pin

A. Valve Lifter

21. Too little valve clearance can cause: a. valve burning c. a rich fuel mixture b. a dished valve d. a higher compression ratio

A. Valve burning

44. The L-head engine is also known as the ____________ arrangement. a. valve-in-block c. overhead b. straight d. valve and spring

A. Valve-in-block

27. The thickness of the margin on a new Briggs & Stratton valve is: a. 1/64" c. 1/16" b. 1/32" d. 1/8"

B. 1/32"

62. The ideal air to fuel ratio by weight for a small engine is: a. 10:1 c. 20:1 b. 15:1 d. 25:1

B. 15:1

13. If a valve has a 30 degree face then the seat would be: a. 30 degrees c. 60 degrees b. 31 degrees d. it doesn't matter

B. 31 degrees

12. If a valve has a 45 degree face then the seat would be: a. 45 degrees c. 90 degrees b. 46 degrees d. it doesn't matter

B. 46 degrees

40. What pushes against the valve tappets to make them move? a. cam gear c. crankshaft b. cam lobes d. connecting rod

B. Cam lobes

55. The camshaft in an overhead cam design is usually driven by either a ________ or ________. a. chain or gear c. belt or gear b. chain or belt d. gear or shaft

B. Chain or belt

16. When checking the valve tappet clearance the piston should be at the top of the __________ stroke and then a 1/4" down from there. a. intake c. power b. compression d. exhaust

B. Compression

4. On which two strokes are both valves closed? a. intake and exhaust c. intake and compression b. compression and power d. power and exhaust

B. Compression and power

63. A flexible piece in the carburetor that pulsates when a vacuum is created in the engine and draws fuel into a chamber of the carburetor is called a: a. venturi c. spring b. diaphragm d. float

B. Diaphragm

3. On the __________ stroke of an engine the piston is going up one valve is open and the other valve is closed and the fumes are leaving the cylinder. a. intake c. power b. exhaust d. compression

B. Exhaust

81. Carburetors that are non adjustable are equipped with a _____ jet. a. narrow c. wide b. fixed d. closed

B. Fixed

96. A dual element filter has a ________ type filter as the pre-cleaner. a. neoprene c. paper b. foam d. cartridge

B. Foam

97. Single element ________ filters should be oiled to help catch dust particles better. a. neoprene c. paper b. foam d. cartridge

B. Foam

93. The engine speeds up and the governor responds the engine speed drops and the governor stops functioning. The engine speeds up again and the governor responds again. When this action is repeated over and over it is known as: a. working properly c. governing b. hunting d. weighting

B. Hunting

30. Why are the valves more important in a one-cylinder engine than a multi-cylinder engine? a. They are not more important in a one cylinder engine. c. The one-cylinder engines cost more. b. If the valves fail in a multi-cylinder engine you only lose a portion of the power but if they fail in a one-cylinder engine you lose all power. d. The one-cylinder engines are more powerful.

B. If the valves fail in a multi-cylinder engine you only lose a portion of the power but if they fail in a one-cylinder engine you lose all power.

74. The needle valve in the carburetor float bowl has a needle point that can be of which two types? a. neoprene or stainless steel c. plastic or brass b. neoprene or brass d. plastic or stainless steel

B. Neoprene of brass

33. Valve overlap is when both valves are: a. closed c. both a and b b. open d. neither a nor b

B. Open

47. In the ____________ arrangement both the camshaft and valve assemblies are installed in the cylinder head. a. overhead valve c. straight valve b. overhead cam d. L-head

B. Overhead cam

48. When referring to a type of engine OHV stands for: a. overhead vertical c. outside horizontal valve b. overhead valve d. overhead voltage

B. Overhead valve

50. In an overhead valve configuration ____________transfer motion from the valve lifters to one end of the rocker arms. a. tappets c. valve stems b. pushrods d. valve levers

B. Pushrods

79. When the choke on a carburetor is closed it provides: a. a lean air-fuel mixture c. more air flow b. a rich air-fuel mixture d. a smoother running engine

B. Rich air-fuel mixture

91. The __________ in a governor system on an engine is designed to pull the throttle valve to wide open position. a. shaft c. flyweights b. spring d. gears

B. Spring

65. Gum deposits which clog the carburetor and other fuel system parts are caused by: a. overheating c. inadequate operating speeds b. stale gasoline d. stalling

B. Stale gasoline

23. Which of the following is a part of a valve? a. lobe c. leg b. stem d. tail

B. Stem

10. If the intake valve fails in a one-cylinder engine the engine will: a. run poorly c. idle high b. stop d. backfire

B. Stop

19. On overhead valve engines the valve clearance is corrected by: a. clearance does not have to be checked c. grinding on the end of the valve stem b. using a wrench and turning the adjusting nut. d. grinding on the end of the tappet

B. Using a wrench and turning the adjusting nut

35. A ____________ must be used on each valve to hold it firmly against the seat. a. grinding compound c. valve tappet b. valve spring d. valve push rod

B. Valve spring

67. The air-fuel mixture entering a two-stroke cycle engine initially enters the engine through the: a. intake valve c. reed valve b. carburetor d. intake port

B. carburetor

95. A foam air cleaner should be cleaned using: a. kerosene c. gasoline b. liquid detergent and water d. either a or b

B. liquid detergent and water

8. A single cylinder Briggs and Stratton engine has: a. 1 valve c. 2 valves b. 4 valves d. 3 valves

C. 2 valves

56. The overhead valve design as compared to the L-head design can increase fuel efficiency by as much as ________. a. 5% c. 25% b. 10% d. 50%

C. 25%

71. The air-fuel mixture is forced into the intake manifold by ____________. a. increased pressure c. atmospheric pressure b. throttle acceleration d. emulsion tubes

C. Atmospheric pressure

76. A round disc mounted on a shaft located at the intake end of the carburetor is called a: a. throttle c. choke b. filter d. venturi

C. Choke

17. On L-head engines if the valve tappet clearance is too small the proper clearance is obtained by: a. grinding on the valve face. c. grinding on the end of the valve stem. b. grinding on the valve head. d. grinding on the end of the tappet.

C. Grinding on the end of the valve stem.

51. In an overhead valve configuration where are the rocker arms installed? a. in the block c. in the cylinder head b. to the crankshaft d. in the crankcase

C. In the cylinder head

26. The camshaft opens and closes the: a. intake valve c. intake and exhaust valves b. exhaust valve d. reed valves

C. Intake and exhaust valves

1. What is the correct order of the strokes in a 4-stroke cycle engine? a. intake exhaust compression and power c. intake compression power and exhaust b. compression power exhaust and intake d. intake power compression and exhaust

C. Intake, compression, power, exhaust

37. The difference in the angle between the valve seat and the valve face is called a/an: a. tri-angle fit c. interference fit b. angle fit d. compression fit

C. Interference fit

43. What are the 3 main types of valve train configurations used in small gasoline engines? a. straight valve overhead valve overhead cam c. L-head overhead valve overhead cam b. L-head poppet valve reed valve d. stem valve overhead valve reed valve

C. L-head, overhead valve, and overhead cam

73. The purpose of the carburetor float is to: a. increase pressure c. maintain a constant level of fuel in the float bowl. b. keep a tight seal in the carburetor d. decrease pressure in the venturi

C. Maintain a constant level of fuel in the float bowl

82. On carburetors that have adjustments the initial carburetor adjustment of the needle valve adjusting screw should be: a. closed and not adjusted again c. open 1 1/2 turns b. open all the way d . it doesn't matter

C. Open 1 1/2 turns

85. The purpose of a small engine's governor is to prevent: a. variations of low idle speeds. c. overspeeding and underspeeding b. increasing power output under load d. overloading and flooding

C. Overspeeding and underspeeding

75. The carburetor float can be made of which two types? a. neoprene or stainless steel c. plastic or brass b. neoprene or brass d. plastic or stainless steel

C. Plastic or brass

89. Which type governor has a movable air vane that moves based upon the air pressure around the spinning flywheel? a. mechanical c. pneumatic b. flyweight type d. diaphragm

C. Pneumatic

20. When checking the valve clearance on OHV engines the clearance is checked between the valve stem and the __________. a. tappet c. rocker arm b. lifter d. push rod

C. Rocker arm

54. In an overhead cam design the camshaft may be positioned directly over the valves or they may be offset. If the camshaft is offset ____________ are added to the design to transfer motion from the camshaft to the valves. a. pushrods c. rocker arms b. lifters d. springs

C. Rocker arms

98. Paper air filter cartridges should be cleaned by: a. washing in liquid detergent and water c. tapping lightly on a hard surface b. washing in kerosene d. using compressed air

C. Tapping lightly on a hard surface

34. A machined hole in the block through which the valve stem passes in order to align the valve and assure accurate raising and lowering in relation to the seat is called the a. valve tunnel c. valve guide b. valve passage d. valve insert

C. Valve guide

53. When one end of the rocker arm is pushed up the other end pushes down on the ____________. a. camshaft c. valve stem b. crankshaft d. valve head

C. Valve stem

60. Which of the following statements is true? a. Most valve face angles are 60 degrees c. Valve guides can be replaced. b. To adjust the tappet clearance on OHV engines the valve stem must be ground. d. If valves are warped they can still be used.

C. Valves guides can be replaced

28. Briggs & Stratton recommends that valves be replaced when the margin measures less than __________. a. 3/64" c. 1/32" b. 1/16" d. 1/64"

D. 1/64"

11. What is the most common angle on a valve face? a. 30 degrees c. 50 degrees b. 60 degrees d. 45 degrees

D. 45 degrees

25. Valve springs must be replaced if they: a. are bent c. do not meet tension specifications b. are not square d. all of the above

D. All of the above

72. Which of the following is not a basic type of carburetor? a. natural draft or side draft c. downdraft b. updraft d. angled draft

D. Angled draft

18. On L-head engines if the valve tappet clearance is too big the proper clearance can be obtained by: a. refacing the valve c. lapping the valve b. recutting the seat d. any of the above

D. Any of the above

84. When the load on the engine increases the __________ automatically opens the throttle valve to allow more air-fuel mixture to enter the engine. a. carburetor c. choke b. breather d. governor

D. Governor

6. The exhaust valve is difficult to cool because of: a. the spark plug being placed directly above it c. hot water surrounding it b. incoming fuel mixture d. high temperature exhaust gases

D. High temperature exhaust gases

69. The purpose of the venturi on a carburetor is to: a. mix the correct amount of fuel and air c. decrease airspeed/increase pressure b. increase air speed/increase pressure d. increase air speed/decrease pressure

D. Increase air speed/decrease pressure

36. Valves should be cleaned with a power wire brush and then: a. cleaned with soap and water c. honed b. cleaned with gasoline d. inspected for defects

D. Inspected for defects

45. In the ____________ arrangement the camshaft is located in the crankcase and the valves are located in the cylinder block directly above the camshaft lobes. a. overhead valve c. straight valve b. overhead cam d. L-head

D. L-head

32. __________ is a process where the valve face is rubbed against the valve seat using an abrasive compound in order to produce a particular type surface. a. honing c. seating b. boring d. lapping

D. Lapping

92. On lawn mowers the __________ is a factor on how the governor should be adjusted. a. type of gas used c. type of carburetor b. compression ratio d. length of blade

D. Length of the blade

52. The rocker arms operate like: a. gears c. lifters b. springs d. levers

D. Levers

86. Most governors on Briggs & Stratton engines are of two types: a. mechanical and flyweight type c. air vane and pneumatic b. mechanical and centrifugal type d. mechanical and pneumatic

D. Mechanical and pneumatic

59. Which of the following types of engines have valves and springs that are capable of being removed with your hands without the use of tools? a. straight valve engines c. L-head engines b. 2-cycle engines d. OHV engines

D. OHV engines

41. Valves that are used in a 4-stroke cycle engine to open and close the port openings are called: a. head valves c. port valves b. reed valves d. poppet valves

D. Poppet valves

83. The __________ is a hand-operated plunger which when depressed forces additional fuel through the main nozzle prior to starting a cold engine. a. diaphragm c. breather b. welch plug d. primer

D. Primer

61. The basic purpose of a carburetor is to: a. equalize atmospheric pressure c. regulate the amount of fuel entering the engine b. clean the air entering the engine d. regulate the mixture of air and fuel

D. Regulate the mixture of air and fuel

58. If the push rods are bent they must be: a. sanded c. straightened b. measured with a micrometer d. replaced

D. Replaced

38. Which of the following is not a part of the valve system? a. keeper c. spring b. retainer d. ring

D. Ring

29. Which of the following is not a type of valve failure? a. necked c. burned b. dished d. swollen

D. Swollen

22. Which of the following is not a part of a valve: a. head c. face b. margin d. tail

D. Tail

80. The purpose of a choke on a carburetor is: a. to provide more air for the engine. c. to increase the life of the engine. b. to make it run at higher rpm's. d. to make it easier to crank a cold engine.

D. To make it easier to crank a cold engine

42. The valve __________ consists of all of the components that work together to transform the rotation of the crankshaft into the opening and closing of the valves. a. parts c. assembly b. alignment d. train

D. Train

78. Which part of the carburetor is responsible for regulating the amount of air-fuel mixture entering the combustion chamber? a. float c. choke b. venturi d. throttle

D. Venturi