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3B2 > Ch. 6 > Flashcards

Ch. 6 Flashcards

1
Q
  1. An example of an internal combustion engine is:

a. A diesel engine
b. A steam engine
c. A steam turbine
d. A gas turbine
e. An air compressor

A

a. A diesel engine

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2
Q
  1. A two-stroke cycle engine has a power stroke every:

a. Two crank shaft revolutions
b. Four crank shaft revolutions
c. Crank shaft revolution
d. One half revolution
e. One half revolution

A

c. Crank shaft revolution

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3
Q
  1. The distinguishing characteristics of the gasoline engine are________________________________________.

a. vaporized gasoline mixed with air is drawn into the cylinder during the intake stroke
b. ignition is achieved by means of a spark plug
c. governing takes place by throttling the air-fuel mixture
d. the fuel is injected at high pressure
e. four stroke cycle

A

b. ignition is achieved by means of a spark plug

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4
Q
  1. The major differences of the diesel engine compared to the gasoline engine are:
1)     The charge drawn into the cylinder is air only
2)     The fuel is injected at high pressure at the beginning of the compression stroke
3)     Ignition is due to the high temperature resulting from the compression of the air
4)     The fuel is injected at high pressure at the end of the compression stroke
5)     The fuel is injected into the engine cylinder at a high temperature

a. 1, 3, 4
b. 2, 3, 4
c. 3, 4, 5
d. 1, 4, 5
e. 2, 4, 5

A

a. 1, 3, 4

1) The charge drawn into the cylinder is air only
3) Ignition is due to the high temperature resulting from the compression of the air
4) The fuel is injected at high pressure at the end of the compression stroke

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5
Q
  1. Scavenging is:

a. The supplying of air for combustion
b. The removal of exhaust gases from the cylinder
c. Used in all diesel engines
d. Usually used in four-stroke cycle engines
e. Recirculation of exhaust gases to reduce emissions

A

b. The removal of exhaust gases from the cylinder

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6
Q
  1. A two-stroke cycle diesel engine:

a. Always has valves
b. Has difficulty removing exhaust gas from the cylinder
c. Are always of a uniflow type of action
d. Always use scavenging air
e. Requires oil mixed in the air for lubrication

A

b. Has difficulty removing exhaust gas from the cylinder

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7
Q
  1. During the compression stroke of a diesel engine, the temperature may be as high as________.

a. 250°C
b. 350°C
c. 450°C
d. 650°C
e. 850°C

A

d. 650°C

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8
Q
  1. The oil scraper ring in a diesel engine is located:

a. Above the compression rings
b. On the crank shaft
c. On the bottom portion of the piston
d. Next to the camshaft
e. In between the two compression rings

A

c. On the bottom portion of the piston

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9
Q
  1. The pistons use on a diesel engine are commonly made of _____ or _____.
1)     stainless steel
2)     aluminum alloy
3)     carbon steel
4)     cast iron

a. 1, 3
b. 1, 4
c. 2, 3
d. 1, 2
e. 2, 4

A

e. 2, 4

2) aluminum alloy
4) cast iron

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10
Q
  1. An engine that has a/an _____ has the oil contained within the engine crankcase.

a. wet sump type
b. dry sump type
c. gravity feed reservoir
d. outside storage
e. underground storage

A

a. wet sump type

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11
Q
  1. Cylinder liners in diesel engines are usually constructed of______________________.

a. cast iron
b. aluminum
c. white-metal
d. carbon steel
e. alloy steel

A

a. cast iron

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12
Q
  1. Diesel piston crowns are usually____________.

a. convex
b. concave
c. flat
d. contoured
e. none of the above

A

b. concave

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13
Q
  1. Most pistons in large internal combustion engines are provided with______________.

a. four rings
b. three rings
c. five rings
d. six rings
e. two rings

A

c. five rings

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14
Q
  1. Connecting rods are hollow bored to convey lubricating oil to the_______________________.

a. gudgeon pins
b. pistons
c. camshaft
d. cylinder walls
e. piston skirt

A

a. gudgeon pins

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15
Q
  1. Connecting rods are usually made of_______________.

a. carbon steel
b. forged steel
c. aluminum
d. cast iron
e. aluminum alloy

A

b. forged steel

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16
Q
  1. The purpose of the rocker arm is to operate_______________.

a. the camshaft
b. the push rods
c. the oil pump
d. the inlet valves
e. the exhaust valves

A

d. the inlet valves

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17
Q
  1. The wet type of cylinder liner is________________.

a. water cooled
b. oil cooled
c. made of white-metal
d. submerged partly in oil
e. all of the above

A

a. water cooled

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18
Q
  1. The fuel injector_________________________________.

a. injects a mixture of fuel and air into the cylinder
b. injects fuel in the cylinder during the intake stroke
c. has a fuel injection nozzle
d. is used in conjunction with spark ignition
e. None of the above

A

c. has a fuel injection nozzle

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19
Q
  1. The purpose of the carburetor is to:
1)     Mix the fuel and air
2)     Atomize the fuel
3)     Heat the mixture of fuel and air
4)     Control the amount of air-fuel mixture to the engine
5)     Produce a vacuum to draw fuel into the engine

a. 1, 2, 3
b. 2, 3, 4
c. 1, 2, 3, 4, 5
d. 1, 2, 4, 5
e. 1, 3, 4, 5

A

d. 1, 2, 4, 5

1) Mix the fuel and air
2) Atomize the fuel
4) Control the amount of air-fuel mixture to the engine
5) Produce a vacuum to draw fuel into the engine

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20
Q
  1. The purpose of the coil in a battery ignition system is to:

a. Increase the voltage to the plugs
b. Decrease the voltage to the plugs
c. Prevent an arc across points
d. To protect the resistor
e. To interrupt the primary current quickly

A

a. Increase the voltage to the plugs

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21
Q
  1. The choke in a carburetor produces a very rich air-fuel mixture for cold engine starts.

a. True
b. False

A

a. True

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22
Q
  1. A magneto ignition system:

a. Does not require a coil
b. Produces ac power
c. Produces a hotter spark at high speeds
d. Does not require points
e. Does not require a condenser

A

c. Produces a hotter spark at high speeds

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23
Q
  1. In the distributor system for the injection of fuel into a diesel cylinder:

a. Two pumps are used
b. One pump is used
c. One pump is used for each cylinder
d. Only a metering pump is used
e. None of the above

A

a. Two pumps are used

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24
Q
  1. In the common rail system used for injection of fuel into the diesel cylinder:

a. The fuel is injected into the cylinder by the fuel pump
b. The fuel is injected into the cylinder by the injector
c. The system requires two pumps
d. The system does not require a return from the injector
e. The excess fuel returns directly to the inlet of the pump

A

b. The fuel is injected into the cylinder by the injector

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25
Q
  1. The solid injection method includes:
1)     Individual pump system
2)     Distributor system
3)     Common rail system
4)     Air injection system

The air injection system supplies air to the cylinder before compression.

a. 1, 2
b. 2, 3
c. 3, 4
d. 1, 2, 3
e. 1, 3, 4

A

d. 1, 2, 3

1) Individual pump system
2) Distributor system
3) Common rail system

26
Q
  1. In the common rail system of fuel injection, the fuel is pumped from the tank by a ________________________.

a. low pressure pump to the filter
b. low pressure pump to the distributor
c. high pressure pump to the injector
d. high pressure pump to the distributor
e. low pressure pump to the injector

A

e. low pressure pump to the injector

27
Q
  1. Superchargers are _______________________________.

a. used to force more air-fuel mixture into the cylinder of a diesel engine
b. used to force more air only into the cylinder of a gasoline engine
c. are usually of the rotary screw or the centrifugal type
d. used to increase power output
e. are never used on gasoline engines

A

d. used to increase power output

28
Q
  1. In the turbo charger:

a. The exhaust gases are cooled before entering the turbine.
b. The air is cooled before it enters the turbo charger to increase its’ density.
c. The air is cooled after the centrifugal blower to decrease the density of the air.
d. The air is cooled after the centrifugal blower to increase the density of the air.
e. The exhaust gases drive the centrifugal blower which drives the gas turbine.

A

d. The air is cooled after the centrifugal blower to increase the density of the air.

29
Q
  1. The pressure at the discharge of a supercharger may be as high as__________.

a. 100 kPa
b. 120 kPa
c. 10 kPa
d. 30 kPa
e. 140 kPa

A

e. 140 kPa

30
Q
  1. Diesel engines frequently employ extra cooling for the pistons by?
1)     Circulating oil through passages in the piston
2)     Spraying oil on the underside of the piston
3)     Increasing the water flow in the cylinder water jackets
4)     Decreasing the temperature of the cooling water

a. 1, 2
b. 1, 3
c. 2, 3
d. 2, 4
e. 1, 2, 4

A

a. 1, 2

1) Circulating oil through passages in the piston
2) Spraying oil on the underside of the piston

31
Q
  1. In a closed-cooling system for an internal combustion engine:

a. The pump is on the high water temperature side of the engine.
b. The pump is on the low water temperature side of the engine.
c. The expansion tank is on the water supply side of the engine.
d. The cooling water is circulated intermittently.
e. None of the above

A

b. The pump is on the low water temperature side of the engine.

32
Q
  1. Closed circuit cooling systems incorporate____________.

a. a heat exchanger
b. a raw-water supply which passes through the engine
c. a check valve
d. an aluminum coil
e. mechanical coolers

A

a. a heat exchanger

33
Q
  1. Lubrication of the internal combustion engine is necessary in order to:
1)     Reduce friction between moving parts
2)     Reduce wear of parts
3)     Provide cooling of engine parts
4)     Keep parts clean
5)     Increase the life of the valves
6)     Seal between pistons and cylinder walls

a. 1, 2, 3, 5
b. 1, 2, 3, 4, 5, 6
c. 3, 4, 5, 6
d. 2, 3, 4, 5, 6
e. 1, 3, 5, 6

A

b. 1, 2, 3, 4, 5, 6

34
Q
  1. The four-cycle engine is lubricated by thoroughly mixing a measured quantity of lubricating oil with the gasoline.

a. True
b. False

A

b. False

35
Q
  1. The oil filter in a large diesel engine lubricating system is ________________________________.

a. placed on the suction side of the pump
b. between the pump and oil cooler
c. not always required
d. between the return line and the sump
e. None of the above

A

e. None of the above

36
Q
  1. Large diesel engines most commonly use ________ for rotation of the engine during starting.

a. compressed nitrogen
b. compressed natural gas
c. compressed air
d. compressed oxygen
e. All of the above

A

c. compressed air

37
Q
  1. The approximate air pressure required for starting a large internal combustion engine is ___________.

a. 21000 kPa
b. 1500 kPa
c. 1000 kPa
d. 210 kPa
e. 2100 kPa

A

e. 2100 kPa

38
Q
  1. When high-pressure air is used to start an internal combustion engine, the air is applied to the _________ .

a. supercharger
b. turbo charger
c. intake valve
d. cylinders
e. crankcase

A

d. cylinders

39
Q
  1. When high-pressure air is used to start an internal combustion engine, the air is applied to the supercharger.

a. True
b. False

A

b. False

40
Q
  1. The governor in a spark ignition engine controls _______________________________________.

a. the quantity of fuel entering the cylinders
b. the quantity of fuel-air mixture to engine cylinder
c. the spark
d. the quantity of air-fuel mixture entering the carburetor
e. None of the above

A

b. the quantity of fuel-air mixture to engine cylinder

41
Q
  1. The governor in an internal combustion engine regulates _________________________________.

a. the quantity of air to a gasoline engine
b. the quantity of air to a diesel engine
c. the quantity of air and fuel to a diesel engine
d. the quantity of fuel to a gasoline engine
e. None of the above

A

e. None of the above

42
Q
  1. The fuel injection system used for diesel engines is called the______________________________.

a. fluid injection system
b. spray injection system
c. continuous injection system
d. solid injection system
e. turbo injection system

A

d. solid injection system

43
Q
  1. In a diesel engine with a supercharging system, the amount of fuel burned is ______________.

a. increased
b. decreased
c. constant
d. increased during start up and decreased at operating speed
e. increased during shut down

A

a. increased

44
Q
  1. By using exhaust gas to drive a turbo charge, the exhaust temperature is __________________________.

a. increased
b. decreased
c. constant
d. decreased during start up and increased at operating speed
e. constant but decreased during shut down

A

b. decreased

45
Q
  1. For high compression diesel engines:

a. 95% of the heat is converted to work and 5% to waste.
b. 80% of the heat is converted to work and 20% to waste.
c. 70% of the heat is converted to work and 30% to waste.
d. 50% of the heat is converted to work and 50% to waste.
e. 10% of the heat is converted to work and 90% to waste.

A

c. 70% of the heat is converted to work and 30% to waste.

46
Q
  1. The coolant circulation method used for a cooling water system of a diesel engine is the ____________________.

a. natural circulation method
b. condensate return system
c. return trap system
d. vacuum pump with a condensate return system
e. forced circulation with a centrifugal pump

A

e. forced circulation with a centrifugal pump

47
Q
  1. A typical lubrication system for a medium sized diesel engine is a _________________________.

a. natural feed
b. return circulation
c. splash feed
d. forced feed
e. spray feed

A

d. forced feed

48
Q
  1. A supply of oil to a turbocharger is for reason of:
1)     Heating the unit
2)     Lubricating the high speed bearings
3)     Cooling the rotor
4)     Driving the turbocharger

a. 1, 2
b. 1, 3
c. 1, 4
d. 2, 3
e. 2, 4

A

d. 2, 3

49
Q
  1. The cylinder lubrication of small diesel engines is generally_____________.

a. splash
b. spray
c. forced
d. natural
e. upfeed

A

a. splash

50
Q
  1. The compressor supplying compressed air to the cylinder of a large diesel engine is generally driven by_____________.

a. a steam engine
b. a steam turbine
c. a gas turbine
d. a turbo charger
e. an electric motor

A

e. an electric moto

51
Q
  1. An electric starter motor powered by a storage battery may start engines up to_______________.

a. 1000 kw
b. 1500 kw
c. 2000 kw
d. 2500 kw
e. 3000 kw

A

a. 1000 kw

52
Q
  1. In a hydraulic starting system for a diesel engine, to turn over the engine___________________________.

a. oil flows from the filter to the hydraulic motor, causing rotation
b. oil flows from the accumulator to the hydraulic motor, causing rotation
c. oil flows from the reservoir to the hydraulic motor, causing rotation
d. oil flows from the engine driven hydraulic pump to the motor, causing rotation
e. oil flows from the hand pump to hydraulic motor, causing rotation

A

b. oil flows from the accumulator to the hydraulic motor, causing rotation

53
Q
  1. In order to keep a large diesel engine running smoothly and efficiently, the following items must be continuously monitored:
1)     Oil level, temperature and pressure
2)     Cooling system, temperature and pressure
3)     Engine speed
4)     Cooling system, temperature and pressure

a. 1, 2
b. 2, 3
c. 1, 2, 3
d. 2, 3, 4
e. 1, 2, 3, 4

A

e. 1, 2, 3, 4

54
Q
  1. In the digital type of monitoring and control system for a large diesel engine, it utilizes a/an ______________ to take input from the engine sensors.

a. G.P.S.
b. D.C.M.
c. I.C.M.
d. E.C.M.
e. T.C.M

A

d. E.C.M.

55
Q
  1. An engine governor is used to regulate the ___________ of an internal combustion engine.

a. speed
b. exhaust
c. pressure
d. temperature
e. life span

A

a. speed

56
Q
  1. Before starting a large industrial diesel engine, special care should be taken to see that the ___________________.

a. tires’ pressure are correct
b. fuel tank is full
c. the engine room is well lit
d. the floor is free of oil spills
e. the fuel injection pump is primed

A

e. the fuel injection pump is primed

57
Q
  1. Before starting a large industrial diesel engine, to ensure that all valves work freely in their guides, __________ is applied to the valve system.

a. a little clean kerosene
b. a little clean gasoline
c. a little clean water
d. a little clean diesel
e. a little clean sulphuric acid

A

a. a little clean kerosene

58
Q
  1. While starting a large industrial diesel engine, the oil pressure may not go above the low oil pressure trip setting until the engine has started up, therefore a/an __________ switch is pushed in to override the trip.

a. crossover
b. overriding
c. interlocking
d. by-pass
e. equalizing

A

d. by-pass

59
Q
  1. If possible, an industrial size diesel engine should start up with _________ load until normal operating temperature has been reached.

a. no
b. high
c. medium
d. full
e. extra

A

a. no

60
Q
  1. Shortly after a large diesel engine is started up and the oil pressure is increased to above the trip setting, the bypass switch is to be returned to the ____________ position.

a. off
b. run
c. hand
d. controlled
e. manual

A

b. run

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