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Test Review > Stationary engines > Flashcards

Stationary engines Flashcards

1
Q

when entering a large engine you would _____________to ensure safe entry

lock the flywheel

block the crankshaft throws

block the engine

the 1st and 2nd answers are correct

A

1st and 2nd answers are correct

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2
Q

when working on a large stationary engine, you should always

disconnect the power source

blind the piping valves

purge engine cylinders

all the above

A

All of the above

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3
Q

when claculating torque, distance is the

diameter at which the force acts

circumference at which the force acts

radius at which the force acts

all the above

A

Radius at which the force acts

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4
Q

power is the

applied force causing movement of an object

action of one body on another

resistance of motion between 2 objects

the rate at which work is done

A

Rate at which work is done

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5
Q

brake horse power is the

theoretical power of the engine

power to overcome engine friction

actual power measured at the end of the crankshaft

BHP = IHP + FHP

A

Actual power measured at the end of the crankshaft

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6
Q

stroke can be

the movement of the piston from TDC to BDC

the diameter of the bore

the same as the bore diameter on a square engine

both the 1st and 3rd answers are correct

A

Both 1st and 3rd are correct

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7
Q

clearance volume is the

the distance from the top of the cylinder to top dead center.

the volume left in the cylinder between the piston and cylinder head when the piston is at TDC.

is the volume left around the piston so the piston does not contact the cylinder wall.

all the above

A

the volume left in the cylinder between the piston and cylinder head when the piston is at TDC.

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8
Q

volumetric efficiency is

how well the engine converts energy in the fuel to the mechanical energy

the ratio of the volume of atmospheric air drawn into the cylinder on the intake stroke to the cylinder displacement

the displacement plus the clearance volume divided by clearance volume

none of the above

A

The Ratio of the volume of atmospheric air drawn into the cylinder on the intake stroke to the cylinder displacement

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9
Q

blowby is the leakage of engine oil by the piston rings and into the crankcase

true

False

A

False
Blowby is the leakage of gasses or pressure into the crankcase

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10
Q

for an engine to have combustion, it will need which of the following

fuel, air, spark

fuel, air, gas

fuel, air, compression of ignition

both the 1st and 3rd answers are correct

A

Both 1st and 3rd are correct

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11
Q

on a 4 stroke engine, the exhaust valve cracks open at the end of the ________stroke

compression

intake

power

exhaust

A

Power

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12
Q

on a 2 stroke engine, a complete cycle takes place in__________of the crank shaft rotation

720 degrees

360 degrees

180 degrees

480 degrees

A

360 degrees

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13
Q

on a 2 stroke engine, the exhaust and intake happens almost simultaniously near

BDC

TDC

A

BDC

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14
Q

.crankshaft rotation can be CW or CCW and is viewed from the ________end of the engine

harmonic balancer

crankshaft

flywheel

fan

A

Flywheel

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15
Q

the numbering of the cylinders starts at the end of the engine, furthest from the_________

harmonic balancer

crankshaft

flywheel

fan

A

Flywheel

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16
Q

the firing order is

established by the crankshaft throws and the arangement of the lobes on the camshaft

can be any random numbering of the cylinders

helps improve fuel consumption

all the above

A

Established by the crankshaft throws and the arrangement of the lobes on the camshaft

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17
Q

running mates

apply to 4 stroke engines only

apply to 2 stroke engines only

refers to the 2 cylinders that have the pistons reaching TDC at the same time

both the 1st and 3rd answers are correct

A

Both 1st and 3rd are correct

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18
Q

which of the following is not a valve arrangement on an engine

opposed

overhead

multi-valve

flat head

A

Opposed

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19
Q

overhead cams are used on smaller engines and they solve the problem of valve train mass

true

false

A

true

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20
Q

naturally aspirated engines

do not achieve 100% volumetric efficiency

use atmospheric pressure to push air into the system

are 4 stroke engines

all the above

A

All of the above

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21
Q

compression ingnition engines have__________then spark ignition systems

higher compression ratios

higher compression temperatures

a lighter weight

both the 1st and 2nd answers are correct

A

Both 1st and 2nd answers are correct

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22
Q

intergral engines

have the load attached to either end of the engine

have the load as part of the engine

A

Have the load as part of the engine

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23
Q

when the main bearing caps for the crankshaft are mounted below, it is called

under slung

over slung

multi-piece

2 piece

A

Under slung

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24
Q

if testing the block for cracks using pressure, make sure to use no more than ________psi

10

25

35

45

A

45

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25
Q

to correct issues with the bore of the main bearings, you would

shim the bearing caps

use a die grinder

line bore

none of the above

A

Line bore

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26
Q

on large engines, you can use a deflection gauge positioned between _________to find crankshaft alignment

the caps

the connecting rods

the bearings and journals

the counter-weights of crankshaft

A

The counter weights of the crankshaft

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27
Q

when doing a line bore, it is important to keep the crankshaft centerline as close to its original centerline as possible

true

False

A

True

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28
Q

the highest wear area in a cylinder is near the

bottom of the stroke

middle of the stroke

top of the stroke

same thru the entire stroke

A

Top of the stroke

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29
Q

the difference between dry and wet liners is the

wet liners inside bore is explosed to the coolant

dry liners exterior is not exposed to the coolant

wet liner is harder to take out then a dry liner

wet liners are made of thinner material then dry liners

A

Dry liners exterior is not exposed to the coolant

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30
Q

liner bore inspection is done

after the liner is taken out of the block

before the liner is taken out of the block

it does not matter

A

Before the liner is taken out of the block

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31
Q

major cylinder wear will take place at the ________ of the cylinder during the _______ stroke (thrust side)

bottom, power stroke

top, power stroke

bottom, compression stroke

A

Top
power stroke

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32
Q

when measuring a cylinder liner bore, you will take measurements in 2 places around the bore, 1 in line with the crankshaft and 1- 90 degrees to the crankshaft. you will take these 2 measurements at the top, bottom and middle of the liner length. (3 places)

true

False

A

True

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33
Q

cavitation on a wet cylinder liner will happen on the coolant side of the liner. to help this you can

pressurize the cooling system

chrome plate the outside of the liner

add additives to the coolant

all the above

A

All of the above

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34
Q

a ridge reamer is a tool used to

true the piston

true the cylinder bore its full length

take the ridge off of the top of the cylinder bore

clean the piston rings

A

Take the ridge off the top of the cylinder bore

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35
Q

when deglazing, you want your cross hatch pattern to be ___________ degrees

40-60

30-40

20-40

60-80

A

40-60 degrees

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36
Q

it is important to measure removable liner bores for

maximum diameter

out of round

taper

all of the above are correct

A

All of the above are correct

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37
Q

the wet liner counter bore should be checked for depth and flatness so the _______ of the liner will be correct

sealant seal

protrusion

bore

block deck

A

Protrusion

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38
Q

for proper sealing of the wet liner, you need to

untwist and seat all 0-rings

lubricate 0-rings

put RTV sealant under the top liner flange

all the above

A

All of the above

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39
Q

the __________ are off center to harness the piston motion of the engine

webs

main bearings

throws (conneting rod journals)

counter-weights

A

Throws

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40
Q

when inspecting the crankshaft, you should ____________ to determine if it needs repair

refer to manufactures specifications

measure crankshaft journals in 2 places, 90 degrees from each other

check for taper and proper fillet radius

all the above

A

All of the above

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41
Q

the fly wheels main job is to

balance the engine

start the engine

stabalize the speed fluctuations and store energy during power pulses

allow for pinning during shut down

A

Stabilize the speed fluctuations and store energy during power pulses

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42
Q

a harmonic balancer is used to dampen torsional vibration from the crank twisting. which is not a type of dampner

rubber mounted

viscous

spring

solid metal

A

Solid metal

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43
Q

embeddability of a journal bearing is its ability to

withstand penatration

withstand shock

absorb small particles

resist heat

A

Absorb small particles

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44
Q

.crush in manufactured into a journal bearing to achieve a secure fit in the bearing housing after being installed and torqued

true

false

A

True

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45
Q

plastigage is a method of checking for the amount of bearing clearance when the crank is installed. it will be placed between the

bearing and bearing cap

bearing and the crankshaft (crankshaft bearing surface)

bearing and the block

all the above

A

Bearing and the crankshaft

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46
Q

if you use the lift method for checking bearing clearance, you would place the dial indicator on the ___________ when checking the main bearing clearance

block and read off the connecting rod

the block and read off the crankshaft

the crankshaft and read off the block

the crankshaft and read off the connecting rod

A

Block and read off the crankshaft

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47
Q

a roll pin is used to

measure the new bearings for size

hold the plastigage durnig crush

locate the dowel pins

take out and put in bearing halves with the crankshaft in place

A

Take out and put in bearing halves with the crankshaft in place

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48
Q

avoid touching the bearing surfaces with your fingers as it may cause

corrosion

distortion

clearance loss

all the above

A

Corrosion

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49
Q

once the correct clearances are verified for the crankshaft, you will

make sure the rear main seal is lubed and in place

align thrust bearings

check crankshaft end play

all the above

A

All of the above

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50
Q

you should always match mark connecting rods and caps if they are not marked

true

false

A

True

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51
Q

the rod bolt torque method(s) could be

torque wrench

torque turn method

elongation

all the above

A

All of the above

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52
Q

pistons have rings around their circumference to

provide dynamic sealing between piston and cylinder wall

prevent combustion pressures from entering the crank

prevent oil from entering the combustion chamber

all the above

A

all of the above

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53
Q

the crosshead type piston is

one piece design

a 2 piece design

flexible becasue the crown can expand separately from the piston skirt

the 2nd and 3rd answers are correct.

A

Both 2nd and 3rd are correct

54
Q

compression rings are activated by gas pressure from the compression and combustable gases pushing

up on the rings

down on the rings

down and out on the rings

up and out on the rings

A

Down and out on the rings

55
Q

.when checking piston rings during installation, you should have the right amount of end gap and side clearance to help eliminate oil consumption and blowby

true

False

A

True

56
Q

when installing piston rings with an internal chamfer, the chamfer should face down

true

False

A

False
Should face up

57
Q

you will need to rotate the crankshaft to TDC to help install the piston and rod

true

False

A

False

58
Q

when you torque the bolts on an engine, make sure to follow manufacturers specifications

true

False

A

True

59
Q

the camshaft has lobes that help determine the

lift of the valve

length of time the valve stays open

valve overlap

all the above

A

All of the above

60
Q

the cam shaft on a 4 stroke engine turns________of the crankshaft

the same speed

2 times the speed

1/2 the speed

none of the above

A

1/2 the speed

61
Q

lifters and pushrods transfer motin from the ______to the________ in camshaft in block engines

crank, valves

cam, valves

valves, rocker arm

cam, rocker arm

A

Cam, rocker arm

62
Q

____________ lifters do not need to be adjusted after the initial adjustments

hydraulic

solid

A

Hydraulic

63
Q

the valve bridge or cross heads are used for on cylinder heads with 4 valves per cylinder

true

false

A

True

64
Q

valve seat width is important because

if it is to wide, there could be carbon build up

if it is to narrow, there could be excess cooling

both the 1st and 2nd answers are correct

none of the above

A

Both first and second answers are correct

65
Q

if valve guides and seats are worn, then the __________ should be done forst

valve guides

valve seats

A

Valve guides

66
Q

valve clearnace is set up between the rocker arm and the pushrod to compensate for component expansion and wear of the valve operating mechanism

true

False

A

False
Between the rocker arm and valve

67
Q

valve clearance is set when the valve is open

true

False

A

False
when valve is closed

68
Q

the back pressure in an exhaust system should be_________

1 psi

4 psi

8 psi

10 psi

A

1 PSI

69
Q

a catalytic converter is working properly when the temperature is_________

100 degrees F higher at the inlet then the outlet

38 degrees F higher at the outlet then the inlet

100 degrees F higher at the outlet then the inlet

38 degrees F higher at the inlet then the outlet

A

100 degrees F higher at the outlet then at the inlet

70
Q

for most engines, the ideal cooling temperature for the engine to run properly is between _______ degrees F

180 to 200

300 to 350

32 to 200

none of the above

A

180 to 200 degrees F
82 to 95 C

71
Q

the thermostat must be installed so the temperature sensor faces toward the engine

true

false

A

True

72
Q

coolant is usually a mxture of _______ water to ______ antifreeze

20, 80

80, 20

70, 30

50, 50

A

50 50

73
Q

system operating pressure in a lubrication system is determined by the

oil stop valve

oil sump

bearing clearances

maximum pressure relief valve

A

Bearing Clearances

74
Q

filters in a lubrication system can be full flow filtration or bypass filtration

true

False

A

True

75
Q

depth type filters trap particles below the surface with the use of cotton, wood chips and steel wool

true

False

A

True

76
Q

pumps that supply oil to the bearings before start-up or during cool down are called post lube or pre-lube pumps

true

False

A

True

77
Q

oil changes can be influenced by

fuel type

environmental conditions

volume of oil in the sump

all the above

A

All of the above

78
Q

when changing oil, you should make sure to _______on large stationary engines

change the oil while it is still warm and just after it is shut down

change the oil when it has cooled down

change the oil every 5000 hrs

does not matter when you change the oil

A

Change the oil while it is still warm and just after it has shut down

79
Q

if you have a problem with low oil pressure, it might be

higher than normal bearing clearances

new bearings that are to tight

relief valve may be stuck closed

all the above

A

Higher than normal bearing clearances

80
Q

crankcase ventilation systems are designed to remove __________ from the crankcase

intake gases

head gases

blowby gases

gas tank gases

A

Blowby gases

81
Q

a fuel with a high octane rating will

burn fast

burn slow

A

Burn slow

82
Q

pre-ignition is caused by

extreme compression of the gas after initial ignition

hot spots in the cylinder

to long of a spark plug

to short of a spark plug

A

Hot spots in the cylinder

83
Q

carburetors operate on a venturi action. this is similar to

pascal’s law

bernoulli’s principle

the law of conservation

A

Bernoulli’s principle

84
Q

some fuel injection systems spray the gas into the _______ with ______

carb, fuel pressure

intake system, fuel pressure

cylinder, vacuum

head, atmospheric pressure

A

Intake systems with fuel pressure

85
Q

the oxygen sensors in an electronic fuel injection system sense the _________ at the _________

oxygen levels, intake

CO2 levels, sparkplug

CO2 levels, carb

oxygen levels, exhaust

A

Oxygen levels at the exhaust

86
Q

a fuel-gas scrubber is used in natural gas systems to clean the gas

true

false

A

tRUE

87
Q

with natural gas and propane sustems, it is important to have a ____________ in the system for safety during stalls

pressure regulator

gas filtering system

automatic shut-off valve

expansion tank

A

Automatic shut off valve

88
Q

LPG is 1 1/2 times heavier than air, has a boiling point of -42 degrees C and expands _____________ when it vaporizes

50 times its volume

100 times its volume

200 times its volume

270 times its volume

A

270 times its volume

89
Q

to reduce the higher pressure liquid propane to a low pressure vapor, the gas passes thru the

filter

spray bar

converter/regulator

A

Converter/regulator

90
Q

in diesel fuel systems, the ignition stage takes place because of the

heat of exhaust

heat of compression

low pressures

none of the above

A

heat of compression

91
Q

to help start a diesel engine, you can use glow plugs and /or a higher cranking speed of the engine so more heat is available to help ignite the fuel

true

False

A

True

92
Q

inline fuel injection has its own cam and plunger for each cylinder

true

False

A

True

93
Q

the most efficient filtering system for an induction system on engines is the

spiral rotor (turbo)

Dry

oil bath

manometer

A

Dry

94
Q

turbo lag is a result of

play in linkages

driving the turbo with the engine

driving the turbo with the exhaust

all of the above

A

Driving the turbo with the exhaust

95
Q

the stationary diffuser in a turbo charger converts the kinetic energy of the moving air into increased pressure

true

False

A

True

96
Q

to control the amount of boost (pressure) from a turbocharger, you would sense the output pressure of the compressor and the pressure would operate a waste gate by means of an actuator rod

true

False

A

True

97
Q

spark plugs can be a hot plug or a cold plug. cold plugs are good for engines running at full load and hot plugs are used for engines running at low load or idling. (the length of the heat path determines if it is a hot or cold plug)

true

False

A

True

98
Q

.the magnetic pulse generator is a common triggering device in electronic distributors

true

False

A

True

99
Q

1 cylinder lead

ignition timing is done by using a timing light hooked up to the

2 cylinder lead

it does not matter which one it is hooked uo to

A

1 Cylinder lead

100
Q

air starting of large engines can be used with reduced gearing or the air directed into the cylinders themselves

true

False

A

True

101
Q

to reduce the likely hood of installtion problems with a stationary engine,, the foundation should have a mass of

1.5 times the engine

2.5 times the engine

3.5 times the engine

4.5 times the engine

A

2.5 times the engine

102
Q

.skid mounting of an engine is ideal for smaller engines

true

False

A

True

103
Q

some engine installations use vibration isolators to keep the vibration away from other machinery

true

False

A

True

104
Q

when using a block mounted installation for an engine, the best type of anchor bolt would be

j-bolts

piped

boxed

expansion

A

Boxed

105
Q

the sole plate is the load bearing steel plate that is ______ to the foundation

not level

anchored and grouted

perpendicular

none of the above

A

Anchored and grouted

106
Q

shims are used between the_____ and the______ to make fine adjustments

foundation, engine base

engine base, sole plate

engine, grout

none of the above

A

Engine base and sole plate

107
Q

epoxy grouts are used becasue they are

strong

easy to use

don’t shrink

all the above

A

All of the above

108
Q

exhaust piping for stationary engines should have ________ to help with vibration isolation and thermal expansion

rigid piping

flexible piping or expansion joints

plastic piping

loosened mounting brackets

A

Flexible piping or expansion joints

109
Q

ventilation of an engine building should have the inlet source for the air higher then the outlet

true

False

A

False
Inlet source should be below the outlet air

110
Q

when shutting down a large natural gas stationary engine, never shut off the fuel valve to stop the engine

true

false

A

False
shut off the fuel valve

111
Q

when starting a large engine, you should start the pre-lube pump before you do an engine cranking

true

False

A

True

112
Q

an electronic control system for a large stationary engine is used to monitor and control the engine. it is also used to shut down the engine in the event of a critical alarm

true

False

A

True

113
Q

basic pressure devices that should be monitored on a stationary engine, are lube oil, jacket water, air manifold and crankcase pressure

true

False

A

True

114
Q

the 2 areas of engine troubleshooting are, to determine if the engine has the basic requirements to operate and does it’s mechanical state need correction

true

false

A

True

115
Q

on ignition systems, new magnetos must be timed when installed. this is done by rotating the flywheel until the proper timing mark aligns with the timing hole pointer in the flywheel housing and the engine is on # 2 cylinder TDC firing. (for most engines)

true

False

A

False
#1 cylinder TDC

116
Q

you will test for compression in an engine when the sparkplugs are in the engine

true

False

A

False
Spark plug tester goes in the spark plug hole

117
Q

.valve clearance adjustments can be made on solid lifters. the least confusing way to do this is to start at # 1 cylinder at TDC at the end of the compression stroke and then proceed in the firing order

true

False

A

True

118
Q

electric motors are

DC

AC polyphase

AC single phase

all the above

A

All of the above

119
Q

the power rating of an electric motor refers to the value of output power that a motor will produce at the shaft

without overheating

regardless of a temperature rise

at 125% efficiency

all the above

A

Without over heating

120
Q

for every 18 degrees F rise in insulation temperature above the rated values, the life of the motor is reduced by ________%

10

25

50

75

A

50%

121
Q

.the NEMA motor enclosure type which can prevent ignition of gases or vapors surrounding the machine is the

water proof

totally enclosed fan cooled

explosion proof

weather protected type 2

A

Explosion proof

122
Q

the speed control of DC motors is

uncontrollable

unreliable

inaccurate

percise

A

Precise

123
Q

the part of the DC motor that is made from carbon steel and acts as a stationary support and also the return path for the magnetic flux that passes from the field poles to the armature is the

armature

armature windings

main frame

commutator

A

Main frame

124
Q

the component on a DC motor which are used to make a low resistance contact with the commutatot is the

carbon brushes

armature

main frame

field poles

A

Carbon brushes

125
Q

a DC motor may be slowed down or brought to a quick stop by

dynamic braking

regenerative braking

plugging

all the above

A

All of the above

126
Q

squirrel cage induction motors

have no physical connection between the stator and the rotor

have a commutator and carbon brushes

require rheostaatic speed control

all the above

A

Have no physical connections between the stator and the rotor

127
Q

three phase motors are the most common type in industry because they are

of simple design and reliable

rugged and low maintenance

efficient and low cost

all the above

A

All of the above

128
Q

the formula for synchronous speed is

60 X frequency/ #of poles

60 x frequency x # of poles

120 x frequency / # of poles

120 x frequency x # of poles

A

120 x frequency / # of poles

129
Q

the synchronous speed in synchronous motors means that there is

no difference in the speed of the rotor and the speed of the rotating magnetic stator field

a lag in the speed of the rotor in relation to the stator field

an advance speed of the rotor in relation to the stator field

none of the above

A

no difference in the speed of the rotor and the speed of the rotating magnetic stator field

130
Q

an electric motr failure is associated with

mechanical problems

lack of maintenance and general deterioration

the quality of electrical power supply

all the above

A

All of the above

131
Q

one of the principle and common causes of electic motor bearing failure is

improper installation

over lubrication

looseness

misalignment of bearings in the housing

A

Over lubrication

132
Q

extremely high current flow rates upon start-up over heat motors. large motors are ussually limited to ___ starts per hour

2

6

10

15

A

2

Test Review (17 decks)

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