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3B2 > 3B2 Comprehensives > Flashcards

3B2 Comprehensives Flashcards

1
Q

Cylinder liners in diesel engines are usually constructed of:
Select one:

a.
Cast iron

b.
Aluminum

c.
White-metal

d.
Carbon steel

e.
Alloy steel

A

a.
Cast iron

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2
Q

B2C08Q12 The efficiency of axial flow compressors is about __________ greater than centrifugal compressors.
Select one:

a.
5%

b.
20%

c.
15%

d.
10%

A

d.
10%

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3
Q

A two stroke engine has a power stroke every:
Select one:

a.
Two crank shaft revolutions

b.
Four crank shaft revolutions

c.
One crank shaft revolution

d.
One half of a crank shaft revolution

e.
One quarter of a crank shaft revolution

A

c.
One crank shaft revolution

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4
Q

When a new employee reads the procedures for starting a piece of equipment and is shown a way that is different than the one explained in the operation procedures, this does which of the following?
1. Erodes the credibility of the trainer
2. Erodes the credibility of the procedures
3. Increases the chances for the new employee to be involved in an incident
4. Improve the chances of the new employee to pick up bad habits
Select one:

a.
1, 2, 3

b.
2, 3, 4

c.
1, 2, 3, 4

d.
1, 3, 4

e.
1, 2, 4

A

c.
1, 2, 3, 4

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5
Q

What are compressor connecting rods constructed of?
Select one:

a.
Cast iron

b.
Stainless steel

c.
Forged steel

d.
Black iron

e.
Brass

A

c.
Forged steel

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6
Q

In an overspeed trip, where is the centre of gravity for the spring-loaded tripping bolt?
Select one:

a.
Concentric with the shaft

b.
Towards the nut end of the bolt

c.
Towards the condenser end of the shaft

d.
Towards the head end of the bolt

e.
Towards the center of the bolt

A

d.
Towards the head end of the bolt

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7
Q

During start-up of a steam turbine, why is the thrust block pushed against a stop in the direction of the exhaust?
Select one:

a.
For maximum seal clearance

b.
For minimum seal clearance

c.
For maximum blade efficiency

d.
For maximum blade clearance

e.
For minimum blade clearance

A

d.
For maximum blade clearance

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8
Q

When the condensate droplets fall from the surface condenser tubes, what should be used to reheat them?
Select one:

a.
Superheated steam

b.
De-superheated steam

c.
Low-pressure steam

d.
Hot water

e.
Turbine exhaust steam

A

e.
Turbine exhaust steam

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9
Q

What is the maximum temperature of the turbine exit gas.
Select one:

a.
600°C

b.
700°C

c.
750°C

d.
800°C

e.
850°C

A

b.
700°C

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10
Q

Some of the characteristics that make the gas turbine a better choice over other prime movers include which of the following?
1. Low maintenance
2. Minimum cooling water requirements
3. High thermal efficiency
4. Rapid start-up and loading
Select one:

a.
1, 2, 3

b.
1, 2, 4

c.
1, 3, 4

d.
2, 3, 4

e.
1, 2, 3, 4

A

b.
1, 2, 4

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11
Q

During the compression stroke of a diesel engine, how high might the temperature in the cylinder be?
Select one:

a.
250°C

b.
350°C

c.
450°C

d.
650°C

e.
850°C

A

d.
650°C

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12
Q

What kind of bearings do micro-turbines normally use?
Select one:

a.
Journal

b.
Radial tilt-pad

c.
Shell

d.
Anti-friction

e.
Air

A

e.
Air

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13
Q

In a cogeneration system, the thermal load can be controlled by which two of the following strategies:
1. Fixed production of a minimum thermal energy
2. Varying requirements for thermal energy
3. Base loaded for maximum thermal energy
4. Topping for minimum thermal energy
Select one:

a.
1, 2

b.
2, 3

c.
1, 3

d.
2, 4

e.
1, 4

A

a.
1, 2

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14
Q

B2C14Q55 In an activated sludge plant, the ideal range of dissolved oxygen in the aeration tank ranges from:
Select one:

a.
150 mg/L to 40 mg/L

b.
0.15 mg/L to 0.4 mg/L

c.
1.5 mg/L to 4 mg/L

d.
15 mg/L to 400 mg/L

A

c.
1.5 mg/L to 4 mg/L

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15
Q

Water-cooled surface condensers may be classified as which of the following?
1. Radial flow
2. Cross flow
3. Central flow
4. Downflow
Select one:

a.
1, 2

b.
2, 4

c.
1, 2, 3

d.
1, 3, 4

e.
2, 3, 4

A

d.
1, 3, 4

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16
Q

Ammonia refrigerant will __________:
Select one:

a.
Mix easily with mineral oil

b.
Not mix with mineral oils

c.
Mix with oils when heated

d.
Not mix with water

e.
Be added with oil for lubrication purposes

A

b.
Not mix with mineral oils

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17
Q

B2C11Q06 Which of the following is NOT found in a typical automatic non-condensable gas purging system?
Select one:

a.
Hermetic converter

b.
Filter/dryer

c.
Evaporator coil

d.
Condenser

A

a.
Hermetic converter

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18
Q

Gas turbine enclosures do which of the following?
1. Protect equipment from the elements
2. Allow the incorporation of heat and gas detectors
3. Contain the gas turbine DCS controls
4. Keep the turbine from cooling down
5. Provide ventilation systems
Select one:

a.
1, 2, 3

b.
1, 2, 5

c.
2, 3, 4

d.
2, 3, 5

e.
3, 5, 1

A

b.
1, 2, 5

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19
Q

When charging ammonia systems, what does frost on the drum bottom indicate?
Select one:

a.
There is too much refrigerant

b.
The ambient temperature is too high

c.
The refrigerant drum is empty or very nearly empty

d.
The pressure is too high

e.
The refrigerant drum is still full

A

c.
The refrigerant drum is empty or very nearly empty

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20
Q

Which authority makes it mandatory to keep a logbook?
Select one:

a.
Power Engineers Regulation

b.
Industry Trade Union

c.
The plant or chief Engineer

d.
Institute of Power Engineers

e.
Workers Compensation Board

A

a.
Power Engineers Regulation

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21
Q

In a packaged industrial screw compressor, oil is injected to cool, lubricate, and seal the rotors. This oil is then removed in a(n):
Select one:

a.
Air/oil separator

b.
Fluid cooler/air cooler

c.
Moisture separator

d.
Water/oil separator

e.
Air filter

A

a.
Air/oil separator

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22
Q

Parts inventory control falls under which classification of preventive maintenance:
Select one:

a.
Actual work

b.
Paper work

c.
Temporary work

d.
Mechanical work

e.
Pre-work

A

b.
Paper work

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23
Q

The jacking oil pump is shut down when the turbine reaches a speed of approximately _____ rpm.
Select one:

a.
5–10

b.
20–30

c.
40–50

d.
50–60

e.
0–80

A

d.
50–60

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24
Q

A condensate extraction pump on the condenser hot well is usually what kind of pump?
Select one:

a.
Single-stage centrifugal

b.
Multi-stage centrifugal

c.
Positive displacement

d.
Turbine

e.
Double acting reciprocating

A

b.
Multi-stage centrifugal

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25
Q

In order to counter the corrosive nature of the condensate produced from burning fuel with a high sulfur content, a _____ heat exchanger is installed in the condensing heat recovery systems.
Select one:

a.
Plastic lined

b.
Mild steel

c.
High carbon steel

d.
High alloy steel

e.
Stainless steel

A

e.
Stainless steel

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26
Q

An electro-hydraulic governor system uses:
Select one:

a.
High pressure oil from the turbine oil system

b.
A separate fluid power unit for high pressure oil

c.
Oil pressure of approximately 3000 kPa to 4000 kPa

d.
Pressure oil from the turbine oil system and boosts it to approximately 8275 kPa to 11 030 kPa

e.
Flyweights similar to a mechanical-hydraulic governor

A

b.
A separate fluid power unit for high pressure oil

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27
Q

B2C14Q24 Floatable solids form:
Select one:

a.
Floc

b.
Scum

c.
Sludge

d.
Colloidal solids

A

c.
Sludge

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28
Q

B2C14Q62 The __________ test measures all compounds that can be chemically digested, including nitrogenous and carbonaceous BOD.
Select one:

a.
SSV30

b.
COD

c.
BOD5

d.
cBOD5

A

b.
COD

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29
Q

What is usually used as the brine in ammonia indirect refrigeration systems?
Select one:

a.
Lithium bromide

b.
Calcium chloride

c.
Sodium chloride

d.
Sodium hydroxide

e.
Calcium hydroxide

A

b.
Calcium chloride

30
Q

The purposes of a thrust bearing on a large reaction steam turbine include which of the following?
1. Absorbs radial thrust on the shaft
2. Keeps the rotor in an exact position in the casing
3. Prevents any steam from escaping
4. Absorbs any axial thrust on the rotor
5. Supports the dummy piston
Select one:

a.
1, 2, 3

b.
2, 4, 5

c.
2, 4

d.
3, 5

e.
1, 4

A

c.
2, 4

31
Q

B2C14Q10 Waste-water treatment plant operating permits are issued by:
Select one:

a.
The National Pollutant Release Association

b.
The local authority having jurisdiction (AHJ)

c.
The Canadian federal government

d.
The Canadian Council of Ministers of the Environment

A

b.
The local authority having jurisdiction (AHJ)

32
Q

B2C02Q04 In the event of a rising exhaust hood temperature, the __________ will open and provide condensate flow to the low-pressure turbine sections.
Select one:

a.
Ventilator valve

b.
Intercept valve

c.
Non-return valve

d.
Spray valve

A

d.
Spray valve

33
Q

Reciprocating compressors are suitable for:
Select one:

a.
Low-pressure service

b.
High-pressure service

c.
All ranges of pressure

d.
Single-stage only

e.
Compressing only air

A

c.
All ranges of pressure

34
Q

Single-acting reciprocating compressors that have the bottom of the cylinder open to the crankcase will have lubrication provided by a(n):
Select one:

a.
Pressure lubricator

b.
Force fed oil pump

c.
Splash system

d.
Oil ring

e.
Separate oil pump

A

c.
Splash system

35
Q

What is the basic operating principle of an axial flow compressor similar to?
Select one:

a.
Centrifugal compressor

b.
Reciprocating compressor

c.
Reaction turbine in reverse

d.
Reaction turbine

e.
Rotary compressor

A

c.
Reaction turbine in reverse

36
Q

B2C14Q41 In secondary waste-water treatment, bacteria feed on organic material and convert it to:
Select one:

a.
Water, carbon dioxide, and digested waste solids

b.
Water, H2S, and methane

c.
Water, carbon dioxide, and H2S

d.
Water, carbon dioxide, and methane

A

a.
Water, carbon dioxide, and digested waste solids

37
Q

What usually controls the refrigeration condenser cooling water?
Select one:

a.
Level controls

b.
Cooling tower demands

c.
Compressor discharge pressure

d.
Hand-operated gate valves

e.
The level in the receiver

A

c.
Compressor discharge pressure

38
Q

Comparing refrigerating systems is usually done at which temperatures?
Select one:

a.
40°C condensing and 10°C evaporating

b.
30°C condensing and –15°C evaporating

c.
45°C condensing and 0°C evaporating

d.
–15°C condensing and 30°C evaporating

e.
50°C condensing and –5°C evaporating

A

b.
30°C condensing and –15°C evaporating

39
Q

B2C14Q32 When coagulant is used, primary clarifiers remove ___________ of the total suspended solids.
Select one:

a.
60% to 90%

b.
50% to 75%

c.
50% to 60%

d.
25% to 40%

A

a.
60% to 90%

40
Q

Why are reducing gears used with gas turbines?
Select one:

a.
To control the speed of the power turbine

b.
To drive slower lube oil pumps

c.
To reduce turbine speed before shutdown

d.
To achieve desired speed of the load

e.
To reduce horsepower requirements

A

d.
To achieve desired speed of the load

41
Q

Refrigeration oils are usually what kind of oils?
Select one:

a.
Mineral oils with high pour point

b.
Mineral oils with low viscosity

c.
Mineral oils with low pour point and high viscosity

d.
Non-mineral oils with naphthalene base

e.
Non-mineral oils with low pour point and viscosity

A

c.
Mineral oils with low pour point and high viscosity

42
Q

B2C14Q36 ____________ leaves the secondary treatment aeration tank and enters the secondary clarifier.
Select one:

a.
Black liquor

b.
Return activated sludge

c.
Waste activated sludge

d.
Mixed liquor

A

d.
Mixed liquor

43
Q

A _____ is used to activate an inlet air unloader by responding to receiver pressure.
Select one:

a.
Solenoid valve

b.
Spring-loaded pilot valve

c.
Spring

d.
Lever

e.
Camshaft

A

b.
Spring-loaded pilot valve

44
Q

Feedwater heaters use the _____ of bleed steam to heat feedwater.
Select one:

a.
Sensible heat

b.
Latent heat

c.
Superheat

d.
Sensible and latent heat

e.
Sensible and superheat

A

b.
Latent heat

45
Q

B2C10Q06 The work of compression represented on a pH diagram is the difference in enthalpy __________.
Select one:

a.
h2 – h1

b.
h1 – h2

c.
h2 – h3

d.
h1 – h4

A

a.
h2 – h1

46
Q

B2C14Q26 Grit is cleaned with:
Select one:

a.
A sodium hydroxide solution

b.
A grit washer

c.
A screenings press

d.
A grit channel

A

b.
A grit washer

47
Q

What is the advantage of mechanical-hydraulic governors?
Select one:

a.
No flyweights are required

b.
A separate high-pressure oil system is not required

c.
A low amount of control air is required

d.
Mechanical losses are greatly reduced

e.
There is no direct linkage to the turbine shaft

A

d.
Mechanical losses are greatly reduced

48
Q

The pistons used in a diesel engine are commonly made of which of the following?
1. Stainless steel
2. Aluminum alloy
3. Carbon steel
4. Cast iron
Select one:

a.
1, 3

b.
1, 4

c.
2, 3

d.
1, 2

e.
2, 4

A

e.
2, 4

49
Q

Why is a high vacuum maintained before charging a refrigeration system?
Select one:

a.
To draw in atmospheric air

b.
To prevent an explosion

c.
To condense the moisture to be removed

d.
To prevent condensate from evaporating

e.
To evaporate moisture so it can be removed in vapour form

A

e.
To evaporate moisture so it can be removed in vapour form

50
Q

In pressure-compound steam turbines, which of the following are true?
1. The expansion of steam from boiler pressure to exhaust pressure is carried out in a number of steps or stages.
2. Each stage has a set of nozzles and a row of blades.
3. All of the velocity available is developed in one set of nozzles.
4. Rows of moving blades are separated by partitions or diaphragms into which nozzles have been installed.
Select one:

a.
1, 2, 3

b.
2, 3, 4

c.
1, 3, 4

d.
2, 4

e.
2, 3, 4

A

d.
2, 4

51
Q

In a mechanical-hydraulic governor system, what is the purpose of the auxiliary oil pump?
Select one:

a.
It provides oil pressure in case of a main pump failure

b.
It provides oil pressure to the bearings

c.
It provides oil pressure to the governor system

d.
It provides oil pressure during start-up of the turbine

e.
It boosts the main pump’s pressure

A

d.
It provides oil pressure during start-up of the turbine

52
Q

B2C14Q06 The amount of oxygen required to degrade all organic compounds in a given waste-water sample is called:
Select one:

a.
Chemical oxygen demand

b.
Carbonaceous oxygen demand

c.
Total oxygen demand

d.
Nitrogenous oxygen demand

A

a.
Chemical oxygen demand

53
Q

The pressure of the air at the end of the diesel compression stroke may be as high as:
Select one:

a.
4100 kPa

b.
2000 kPa

c.
500 kPa

d.
1500 kPa

e.
5000 kPa

A

d.
1500 kPa

54
Q

What is the definition of a refrigerant?
Select one:

a.
A liquid that absorbs heat at high pressure and gives up heat at low pressure

b.
A fluid that absorbs heat at a low temperature and pressure and gives up heat by condensing at a higher temperature and pressure

c.
A fluid that absorbs heat at a high temperature and pressure and gives up heat by condensing at a lower temperature and pressure

d.
A medium for creating heat

e.
A fluid that absorbs heat at a high pressure

A

b.
A fluid that absorbs heat at a low temperature and pressure and gives up heat by condensing at a higher temperature and pressure

55
Q

B2C14Q70 Like chlorine and oxygen, calcium hypochlorite is:
Select one:

a.
Gaseous

b.
A powerful oxidizer

c.
Highly combustible

d.
A powerful disinfectant

A

b.
A powerful oxidizer

56
Q

B2C14Q50 Anaerobic digesters must be continually cooled so the temperature does not rise above 37°C.
Select one:

a.
False

b.
True

A

a.
False

57
Q

B2C04Q07 The temperature of the combustion flame itself may be as high as approximately 2100°C, but the dilution and cooling results in a lower temperature mixture of _____________.
Select one:

a.
1200°C to 1800°C

b.
1400°C to 1700°C

c.
1000°C to 1500°C

d.
1800°C to 2100°C

A

c.
1000°C to 1500°C

58
Q

Coagulation involves which of the following processes?
1. Mixing
2. Flotation
3. Flocculation
4. Stabilization lagoon
5. Settling
Select one:

A.
1, 3, 5

B.
2, 3, 4

C.
3, 4, 5

D.
1, 2, 3

E.
1, 4, 5

A

A.
1, 3, 5

59
Q

An air filter on an air compressor inlet pipe is used to:
Select one:

a.
Reduce the air velocity

b.
Keep out the moisture

c.
Purify the air by removing exhaust process gases

d.
Prevent dust and other particulates from entering the compressor

e.
Increase the air velocity

A

d.
Prevent dust and other particulates from entering the compressor

60
Q

Why are there fewer turbine blades than compressor blades?
Select one:

a.
Energy can be extracted more efficiently

b.
Turbine blades are bigger so fewer are required

c.
Higher exhaust temperatures can be tolerated

d.
The hot gases occupy more volume

e.
Hot exhaust gases are required for the HRSG

A

a.
Energy can be extracted more efficiently

61
Q

Slugs of liquid carried over from the evaporator in the absorption system cause:
Select one:

a.
Considerable trouble

b.
No damage

c.
More damage than in a compression system

d.
Damage in the absorber

e.
Damage to the compressor

A

b.
No damage

62
Q

To facilitate the removal of moisture from the compressed air, a(n) _____ is installed.
Select one:

a.
Intercooler

b.
Oil separator

c.
Unloader

d.
Expansion tank

e.
Aftercooler

A

e.
Aftercooler

63
Q

_____ compressors require intake and discharge valves.
Select one:

a.
Rotary

b.
Centrifugal

c.
Sliding vane

d.
Rotary lobe

e.
Reciprocating

A

e.
Reciprocating

64
Q

Why are adjustable inlet diffuser vanes on centrifugal air compressors implemented?
Select one:

a.
To change the operating characteristics of the compressor

b.
To change the direction of the air flow to remove moisture

c.
To remove foreign particles from the air

d.
Only to reduce the amount of air entering the compressor

e.
To prevent back or reverse flow of air

A

a.
To change the operating characteristics of the compressor

65
Q

During the start up of a cogeneration system with a gas turbine:
Select one:

a.
The auxiliary burner will provide additional thermal energy to start the gas turbine

b.
The gas turbine is turned/started by a separate starter motor

c.
The gas turbine will start up automatically as soon as power is engaged

d.
The diverter valve will divert thermal energy from the HRSG to start the gas turbine

e.
The gas turbine is normally started up by compressed air

A

b.
The gas turbine is turned/started by a separate starter motor

66
Q

Which of the following are purposes of a surface condenser?
1. Maintain a vacuum at the turbine exhaust
2. Conserve pure boiler feedwater
3. Act as a deaerator
4. Cool the condensate below saturation temperature
Select one:

a.
1, 2, 3

b.
2, 3, 4

c.
1, 2, 4

d.
1, 3, 4

e.
1, 2, 3, 4

A

a.
1, 2, 3

67
Q

A water seal is used on some steam turbines ________ to ensure that no air leaks along the shaft.
Select one:

a.
On start-up

b.
At speeds below 2000 rpm

c.
On shutdown

d.
On the condenser line

e.
At speeds above 2000 rpm

A

e.
At speeds above 2000 rpm

68
Q

In a simple gas turbine, the air is compressed to what maximum pressure?
Select one:

a.
2000 kPa

b.
2500 kPa

c.
3000 kPa

d.
4500 kPa

e.
5000 kPa

A

c.
3000 kPa

69
Q

What must the emergency discharge line of a refrigeration system be provided with?
Select one:

a.
Check valve

b.
Diffuser at its upper end that must be placed above the roof

c.
Strainer

d.
Drain valve

e.
Two stop valves

A

b.
Diffuser at its upper end that must be placed above the roof

70
Q

Information that might be on an equipment record card includes which of the following?
1. Equipment repair history
2. Model type
3. Associated costs
4. Requisition number
Select one:

a.
1, 2

b.
2, 3

c.
1, 2, 3, 4

d.
2, 3, 4

e.
3, 4

A

c.
1, 2, 3, 4

3B2 (16 decks)

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