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2nd Period - Exam Bank > Engines > Flashcards

Engines Flashcards

1
Q

On a piston the _______ supports and stabilizes the piston in the bore.

A) wrist pin
B) piston skirt
C) ring lands
D) ring grooves

A

B) piston skirt

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2
Q

During engine removal, the first component to be disconnected is usually the:

A) air pump.
B) motor mounts.
C) battery.
D) computer fuse.

A

C) battery.

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3
Q

When using a smoke type lead detector to locate a vacuum on a engine, the engine must:

A) be at running temperature.
B) not be running.
C) be at room temperature.
D) have the air cleaner removed.

A

B) not be running.

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4
Q

A gas and a diesel four-stroke engine have the same four strokes.

A) true
B) false

A

A) true

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5
Q

The oil pressure sending unit on an engine is removed and replaced with an oil pressure gauge and run at operating temperature. A low oil pressure reading may be an indication of:

A) worn cam bearings.
B) hydraulic lifters not working.
C) overfilling of oil.
D) a bent pushrod.

A

A) worn cam bearings.

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6
Q

High back pressure from a restriction in the exhaust system can cause:

A) low fuel economy.
B) loss of power at high speeds.
C) faulty oxygen sensor readings.
D) high hydrocarbon emissions.

A

B) loss of power at high speeds.

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7
Q

The ______ cycle engine has a high exhaust emission.

A) two-stroke
B) four-stroke

A

A) two-stroke

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8
Q

The valve spring retainer may fall off during normal engine operation it the:

A) keeper grooves are worn.
B) spring tension is weak.
C) valve is set too high.
D) center of the stem is worn.

A

A) keeper grooves are worn.

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9
Q

The piston in an engine is connected to the connecting rod by use of a:

A) knuckle connector.
B) wrist pin.
C) compression fitting.
D) welded joint.

A

B) wrist pin.

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10
Q

When using a gear puller to remove engine timing gears, it is best to use an impact wrench to speed up the process.

A) True
B) False

A

B) False

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11
Q

When reinstalling the old camshaft in an engine that uses conventional lifters, it is recommended to replace the lifters in their original locations.

A) True
B) False

A

A) True

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12
Q

An engine valve is ground to a 45 degrees angle. Taking into account an interference angle the seat should be ground to ____ degrees.

A) 44
B) 45
C) 46
D) 47

A

C) 46

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13
Q

Abnormal wearing of the crankshaft could be caused by:

A) operating with low oil levels.
B) incorrect SAE viscosity of oil.
C) excessive high engine speeds during the initial break-in period.
D) bent crankshaft.
E) all of the above.
A

E) all of the above.

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14
Q

With a camshaft out of the engine a technician can check the camshaft runout with a:

A) micrometer.
B) telescopic gauge.
C) level.
D) V block and dial indicator.

A

D) V block and dial indicator.

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15
Q

A flywheel is connected to the end of the crankshaft to:

A) absorb and smooth out the power pulses.
B) act as opposition to the counterweights.
C) control the fuel pump.
D) eliminate rocking couple vibrations.

A

A) absorb and smooth out the power pulses.

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16
Q

The final balancing of an engine crankshaft can be accomplished by:

A) attaching bob weights to each rod journal.
B) drilling holes in the crankshaft counterweights.
C) drilling hole sin the counterweights and filling with a heavier metal.
D) all of the above will work.

A

D) all of the above will work.

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17
Q

Excessive seating forces on an engine valve can be caused by:

A) weak valve springs.
B) engine over speed.
C) excessive valve lash.
D) all of the above.

A

D) all of the above.

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18
Q

The least expensive cylinder block to manufacture is the:

A) one-piece with liners.
B) one-piece with integral cylinders.
C) multi-piece block.
D) multi-pace with liners.

A

B) one-piece with integral cylinders.

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19
Q

The simplest way to check a crankshaft for cracks is to hang it by the nose and gently tap each of the counterweights. You will know there is a crack if:
A) there is a high pitched ring.
B) the point at which it is tapped turns color.
C) the hammer does not bounce back.
D) there is no ring.

A

D) there is no ring.

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20
Q

Engine coolant is prevented form entering into the crankshaft by use of:

A) silicone seal.
B) machined surfaces.
C) a recess or counterbore.
D) a wet liner.

A

D) a wet liner.

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21
Q

In a/an ____________ configuration, an air/fuel mixture travels through the manifold runners.

A) wet intake manifold
B) injector
C) dry intake manifold
D) surge intake manifold

A

A) wet intake manifold

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22
Q

The primary function of a ring on a piston is to:

A) control lubrication between the piston and the cylinder wall.
B) help cool the piston.
C) make sure there is gas tight seal between the piston and the cylinder.
D) all of the above.

A

D) all of the above.

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23
Q

An OHC engine is different than most other engines in the fact that it:

A) has a camshaft located in the cylinder head.
B) has more moving parts.
C) consistently develops more torque.
D) will have less accuracy when timing valves.

A

A) has a camshaft located in the cylinder head.

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24
Q

When installing crankshaft main bearings, the hole in the bearing shell is to:

A) allow for expansion during heating.
B) allow oil to lubricate the bearing.
C) indicate the top of the bearing.
D) indicate the front of the bearing.

A

B) allow oil to lubricate the bearing.

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25
Q

The operating temperature of a catalytic converter is between approximately _________ degrees Celsius.

A) 100 to 200
B) 100 to 300
C) 300 to 400
D) 200 to 500

A

C) 300 to 400

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26
Q

At sea level and atmospheric pressure water boils at a temperature of _________ degrees Celsius.

A) 32
B) 100
C) 212
D) 200

A

B) 100

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27
Q

Which of the following is not an engine oil service category?

A) Fuel Economy Rating
B) Viscosity Number
C) Service Designation
D) Fluidity Index

A

D) Fluidity Index

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28
Q

Where is the most likely place to find the cylinder head torque specifications?

A) The vehicle owners manual.
B) Imprinted on the intake manifold.
C) The vehicle service manual.
D) Located on a name plate secured to the firewall.

A

C) The vehicle service manual.

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29
Q

If the readings on a cylinder indicate a 0.28 mm taper then the cylinder should be bored for a ____ mm oversized piston.

A) 0.53
B) 0.56
C) 0.81
D) 0.91

A

C) 0.81

30
Q

When there is white smoke visible from the exhaust of a gasoline-powered engine during cold weather, the cause could be:

A) the valve seals are worn.
B) the PVC system is faulty.
C) a cracked cylinder head.
D) water vapour from combustion.

A

D) water vapour from combustion.

31
Q

Which of the following information is not part of a vehicle identification number?

A) Paint Colour
B) Build Sequence Number
C) Engine Code
D) Model Year

A

A) Paint Colour

32
Q

The tip of a valve in an engine is the part that:

A) seals against the valve seat.
B) part of the valve that is exposed to the combustion chamber.
C) transitions from the stem to the head.
D) makes contact with the valve opening mechanism.

A

D) makes contact with the valve opening mechanism.

33
Q

A lifter is a solid or hydraulic device that connects the:

A) crankshaft and the piston.
B) camshaft and the pushrod.
C) piston and the rocker arm.
D) rocker arm and the valve.

A

B) camshaft and the pushrod.

34
Q

The advantage of the monoblock bearing caps is that it:

A) uses only one bolt per cap.
B) is in one piece therefore ensuring everything is rigid.
C) allows for maximum flexibility.
D) is cast into the block.

A

B) is in one piece therefore ensuring everything is

35
Q

When torquing intake manifold bolts, it is important to follow the manufacturer’s manual for the torque value and the torque sequence.

A) True
B) False

A

A) True

36
Q

As a general rule, the maximum allowable taper on a crankshaft journal is ____ mm.

A) 0.025
B) 0.050
C) 0.075
D) 0.100

A

A) 0.025

37
Q

Oil in an engine can become contaminated by:

A) excessive filter change intervals.
B) coolant leaking into the crankcase.
C) faulty air or crankcase breather filtering systems.
D) metal fragments from the failure of an engine component.
E) operating in extremely dirty conditions.
F) all of the above.

A

F) all of the above.

38
Q

A large percent of wear that occurs on a camshaft is due to:

A) inadequate lubrication.
B) loose rocker arms.
C) excessive speeds.
D) incorrectly aligned lobes.

A

A) inadequate lubrication.

39
Q

In a ____________ configuration, only air travels through the manifold runners.

A) wet intake manifold
B) injector
C) dry intake manifold
D) surge intake manifold

A

C) dry intake manifold

40
Q

When removing the vehicle hood during an engine removal, it is good practice to:

A) mark the location of the hood hinges.
B) identify the size of the hood springs.
C) identify the size of the hood hinges.
D) mark the center point of the hood.

A

A) mark the location of the hood hinges.

41
Q

The fuel that requires the highest compression ratio is:

A) diesel fuel.
B) gasoline.
C) propane.
D) natural gas.

A

A) diesel fuel.

42
Q

Internal parts of the engine such as the crankshaft are cooled by the:

A) convection of air.
B) circulating engine oil.
C) internal coolant passages.
D) PVC valve.

A

B) circulating engine oil.

43
Q

Increased volumetric efficiency in an engine can be accomplished by use of a/an:

A) air scoop.
B) mechanical driven blower.
C) exhaust-driven turbine.
D) all of the above.

A

D) all of the above.

44
Q

Removing a valve spring from an engine and measuring it will give you the valve spring:

A) tension.
B) stem height.
C) installed height.
D) free length.

A

D) free length.

45
Q

What is the name of the design type for a piston ring used on a diesel engine that is highly resistant to carbon buildup?

A) barrel face.
B) keystone.
C) inside bevel.
D) rectangular.

A

B) keystone.

46
Q

Some cylinder heads have ______ installed on the engine valves to help reduce localized hot spots on the valve.

A) fixed retainers
B) cooler washers
C) asbestos rings
D) rotators

A

D) rotators

47
Q

An exhaust valve that is filled with sodium crystals is used:

A) at no time.
B) for serve duty applications where extra cooling is needed.
C) in low heat applications.
D) in small diesel applications.

A

B) for serve duty applications where extra cooling is needed.

48
Q

To completely drain the engine coolant before removing the engine from the vehicle, the cylinder block drain plugs will have to be removed.

A) True
B) False

A

A) True

49
Q

During the deceleration of an engine the oil ring can lift off the bottom of the ring groove and allow oil to pass. This does not happen with the _______ ring.

A) one piece
B) two piece
C) three piece

A

C) three piece

50
Q

When installing a head gasket on an engine the gasket is designed so it does not matter which side is placed upwards.

A) true
B) false

A

B) false

51
Q

A good reference to have during engine removal is:

A) current service bulletins for the vehicle.
B) service manuals for the vehicle.
C) current recall notices for the vehicle.
D) the current owner.

A

B) service manuals for the vehicle.

52
Q

The rocker arm bore size can be checked by use of a:

A) bore gauge.
B) telescopic gauge and micrometer.
C) dial gauge.
D) either A or B.

A

D) either A or B.

53
Q

The muffler in an exhaust system is positioned:

A) before the catalytic converter.
B) between the catalytic converter and the tailpipe.
C) between the resonator and the tail pipe.
D) after the downstream oxygen sensor.

A

B) between the catalytic converter and the tailpipe.

54
Q

The inlet to the water pump is normally connected to the _________ hose of the radiator.

A) top
B) bottom
C) middle

A

B) bottom

55
Q

When lifting the engine from the vehicle, it is recommended to:

A) be done with only one person.
B) be done with two people.
C) lift only on the aluminum castings.
D) lift only with a chain hoist.

A

B) be done with two people.

56
Q

The flywheel or torque converter drive plate is attached to the _____ on the engine crankshaft.

A) counterweight
B) crank web
C) nose
D) flange

A

D) flange

57
Q

It is recommended to drain the engine oil and coolant before removing the engine from the vehicle.

A) True
B) False

A

A) True

58
Q

Excessive wear in any of the valve train system is usually caused by:

A) insufficient lubrication.
B) piston slap.
C) timing too advanced.
D) timing too retarded.

A

A) insufficient lubrication.

59
Q

On a tuned intake manifold the secondary runner is used during:

A) high engine rpm operation.
B) low and moderate engine rpm operation.
C) high altitude operation.
D) low altitude operation.

A

A) high engine rpm operation.

60
Q

A hardened valve seat insert would most likely be in a cylinder head for a:

A) propane engine.
B) natural gas engine.
C) gasoline engine.
D) either A or B

A

D) either A or B

61
Q

When referring to mass, atmospheric air is approximately ________ percent oxygen.

A) 1.0
B) 78.0
C) 21.0
D) 50.0

A

C) 21.0

62
Q

Ports on the exhaust side of a cylinder head are used to:

A) allow the movement of lubricant.
B) circulate the coolant around the cylinder head.
C) direct the exhaust gases from the valves to the exhaust manifold.
D) direct the incoming air through the manifold, the valves and into the cylinder.

A

C) direct the exhaust gases from the valves to the exhaust manifold.

63
Q

When removing a cylinder head, the cylinder bolts can be removed in any order.

A) True
B) False

A

B) False

64
Q

The fillet of a valve in an engine is the part that:

A) seals against the valve seat.
B) part of the valve that is exposed to the combustion chamber.
C) transitions from the stem to the head.
D) makes contact with the valve opening mechanism.

A

C) transitions from the stem to the head.

65
Q

If the oil in a hydraulic lifter leaks down too fast or the lifter does not fill adequately it could result in:

A) a light tapping noise.
B) increased fuel consumption.
C) reduced torque.
D) overheated valves.

A

A) a light tapping noise.

66
Q

The back pressure reading before the catalytic converter should be less than _______ psi.

A) 1.25
B) 1.1
C) 1.0
D) 0.5

A

A) 1.25

67
Q

Transport Canada has set limits on emissions from new vehicles for hydrocarbons, carbon monoxide and ________.

A) oxygen
B) carbon dioxide
C) nitrogen oxides
D) nitrogen

A

C) nitrogen oxides

68
Q

The proper order for removing the cylinder head from an engine is:

A) drain coolant, remove rocker cover and pushrods, remove spark plugs, disconnect battery, remove cylinder head.
B) remove rocker cover and pushrods, disconnect battery, remove spark plugs, drain coolant, remove cylinder head.
C) remove rocker cover and pushrods, remove spark plugs, drain coolant, disconnect battery, remove cylinder head.
D) disconnect battery, drain coolant, remove spark plugs, remove rocker cover and pushrods, remove cylinder head.

A

D) disconnect battery, drain coolant, remove spark plugs, remove rocker cover and pushrods, remove cylinder head.

69
Q

If the refrigerant must be removed from the air conditioning system of a vehicle:

A) it is recommended to vent the refrigerant to the atmosphere.
B) the refrigerant must be collected in a recovery system.
C) it is recommended to vent the refrigerant to the atmosphere during the summer.
D) it is recommended to vent the refrigerant to the atmosphere during the winter.

A

B) the refrigerant must be collected in a recovery system.

70
Q

One full cycle on a two-stroke engine results in the crankshaft rotating _____ degrees.

A) 90
B) 180
C) 360
D) 720 a chain hoist.

A

C) 360

2nd Period - Exam Bank (5 decks)

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