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33 Flashcards

1
Q

Which type of heat recovery system involves the use of an intermediate heat transfer medium?

1)

Direct heat recovery

2)

Indirect heat recovery

3)

Passive heat recovery

4)

Active heat recovery

A

2)

Indirect heat recovery

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2
Q

What does the term “waste heat” refer to in industrial processes?

1)

Heat that is intentionally produced for disposal

2)

Heat that is lost to the environment without being used

3)

Heat that is stored for future use

4)

Heat that is generated by renewable energy sources

A

2)

Heat that is lost to the environment without being used

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3
Q

What is an ORC (Organic Rankine Cycle) system used for in heat recovery applications?

1)

Cooling air

2)

Generating electricity from low-temperature heat sources

3)

Heating water

4)

Storing thermal energy

A

2)

Generating electricity from low-temperature heat sources

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4
Q

Which of the following best describes latent heat recovery?

1)

Recovering heat from solid materials

2)

Recovering heat from gaseous emissions

3)

Recovering heat from the phase change of a substance

4)

Recovering heat from electrical devices

A

3)

Recovering heat from the phase change of a substance

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5
Q

What is a thermal storage system used for in heat recovery applications?

1)

To increase the initial cost of the system

2)

To store recovered heat for use during peak demand periods

3)

To reduce the overall efficiency of the system

4)

To convert heat into electricity

A

2)

To store recovered heat for use during peak demand periods

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6
Q

What is a common use of recovered heat in the food and beverage industry?

1)

Heating process water

2)

Cooling finished products

3)

Generating electricity

4)

Storing products

A

1)

Heating process water

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7
Q

In heat recovery, what does the term “pinch point” refer to?

1)

Maximum pressure point

2)

Minimum temperature difference

3)

Optimal flow rate

4)

Point of highest heat transfer

A

2)

Minimum temperature difference

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8
Q

Which of the following is a common application of recovered heat in a refinery?

1)

Power generation

2)

Cooling towers

3)

Feed pre-heating

4)

Lubrication

A

3)

Feed pre-heating

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9
Q

What is the purpose of a regenerator in a catalytic cracking unit?

1)

Heat recovery

2)

Feedstock preparation

3)

Catalyst regeneration

4)

Product separation

A

3)

Catalyst regeneration

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10
Q

Which type of heat recovery involves using steam from a process to heat another process?

1)

Sensible heat recovery

2)

Latent heat recovery

3)

Waste heat recovery

4)

Process-to-process heat integration

A

4)

Process-to-process heat integration

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11
Q

Which device is used to measure heat recovery efficiency?

1)

Thermocouple

2)

Flow meter

3)

Heat meter

4)

Pressure gauge

A

3)

Heat meter

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12
Q

Which of the following best describes the term “enthalpy”?

1)

Pressure of a system

2)

Heat content of a system

3)

Volume of a system

4)

Density of a system

A

2)

Heat content of a system

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13
Q

Which device uses ceramic heat exchangers to capture and store heat from exhaust gases?

1)

Recuperator

2)

Thermocompressor

3)

Heat Pump

4)

Regenerative Thermal Oxidizer

A

4)

Regenerative Thermal Oxidizer

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14
Q

Why is it important to monitor inlet and outlet temperatures in a heat recovery system?

1)

To ensure the system has room for expansion

2)

To check the system’s operating efficiency

3)

To maintain proper fluid levels

4)

To regulate electrical output

A

2)

To check the system’s operating efficiency
Incorrect Response

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15
Q

What is a key benefit of using a Heat Recovery Steam Generator (HRSG)?

1)

Reduces noise levels

2)

Increases fluid viscosity

3)

Generates steam from waste heat

4)

Decreases system temperature

A

3)

Generates steam from waste heat

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16
Q

What is the temperature of saturated steam at 8 psig (55 kPa)?

1)

183°F (84°C)

2)

203°F (95°C)

3)

235°F (113°C)

4)

240°F (116°C)

A

3)

235°F (113°C)

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17
Q

In what position are the components of a float and thermostatic steam trap upon installation?

1)

Float is closed, thermostatic element is open

2)

Float is open, thermostatic element is closed

3)

Float and thermostatic element are closed

4)

Float and thermostatic element are open

A

Correct Answer
1)

Float is closed, thermostatic element is open

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18
Q

What piece of equipment can be used to regulate a low pressure boiler’s blowdown temperature before entering the municipal sewer system?

1)

Deaerator

2)

Economizer

3)

Heat exchanger

4)

Blowdown regulator

A

3)

Heat exchanger

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19
Q

What type of boiler does not have water surrounding the combustion area?

1)

Flash

2)

Firebox

3)

Firetube

4)

Watertube

A

2)

Firebox

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20
Q

What type of boiler is a D-type bent tube boiler classified as?

1)

Firetube

2)

High mass

3)

Watertube

4)

Condensing

A

3)

Watertube

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21
Q

What is the operating function of an operating control?

1)

Start and stop the feedwater pump

2)

Maintain a constant steam temperature

3)

Start the firing or shutdown sequence of the burner

4)

Maintain a constant pressure at the inlet to the heat emission units

A

3)

Start the firing or shutdown sequence of the burner

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22
Q

What term is defined as “a concrete pad located under equipment”?

1)

Seismic pad

2)

Isolation anchor

3)

Housekeeping pad

4)

Geo-technic foundation

A

3)

Housekeeping pad

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23
Q

What type of draft is caused in a low pressure boiler with a blower located upstream of the combustion chamber?

1)

Forced

2)

Natural

3)

Induced

4)

Negative

A

1)

Forced

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24
Q

What issue is avoided if makeup water in a low pressure steam system is piped into a surge tank?

1)

Cycling

2)

Priming

3)

Thermal shock

4)

Water hammer

A

3)

Thermal shock

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25
Q

What is required on a two pipe low pressure steam heating system to operate properly?

1)

Steam traps

2)

Wet return

3)

Boiler return traps

4)

Condensate pumps

A

1)

Steam traps

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26
Q

What is required on a riser in a low pressure steam system passing through multiple stories of a building?

1)

Vent

2)

Blow off valve

3)

Stop and check valve

4)

Trap station at the bottom

A

4)

Trap station at the bottom

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27
Q

What operates the makeup water valve on a surge tank?

1)

Float on the boiler

2)

Float on the surge tank

3)

Pressure switch on the boiler

4)

Pressure switch on the surge tank

A

2)

Float on the surge tank

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28
Q

Why should a trap station, located downstream of a low pressure heat transfer unit, have a cooling leg if at least 12” (305 mm) long?

1)

Allow any trap to be installed

2)

Equalize back pressure to the trap

3)

Eliminate the need for a vacuum breaker

4)

Reduce flooding of the coil when the control valve is closed

A

4)

Reduce flooding of the coil when the control valve is closed

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29
Q

What does piping offsets on a steam heating coil facilitate?
Correct Answer
1)

Easy removal of coil

2)

Easy piping installation
Incorrect Response
3)

Less stress on coil connections

4)

Piping can be installed plumb and square

A
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30
Q

What equipment would a supervised startup of a low pressure steam system include?

1)

Supervisory cocks on burner

2)

Blind flanges installed on all processes

3)

Manual bypass valves on trap locations

4)

Automatic controls to ramp up steam pressure

A

3)

Manual bypass valves on trap locations
Incorrect Response

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31
Q

Which steam trap has good air removing capacities?

1)

Float

2)

Upright bucket

3)

Inverted bucket

4)

Float and thermostatic

A

4)

Float and thermostatic

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32
Q

Where is a Hartford loop located in relation to the normal operational water line (NOWL)?

1)

1” to 2” (25 mm to 20 mm) above

2)

1” to 2” (25 mm to 50 mm) below

3)

2” to 4” (50 mm to 100 mm) above

4)

2” to 4” (50 mm to 100 mm) below

A

4)

2” to 4” (50 mm to 100 mm) below

33
Q

What is the principal that thermostatic steam traps operate on?

1)

Volumetric expansion/contraction

2)

Temperature differential

3)

Pressure differential

4)

Density variations

A

2)

Temperature differential

34
Q

How should reductions in steam mains be made when the main runs horizontally?

1)

Eccentric reducer, flat side down

2)

Eccentric reducer, flat side up

3)

Concentric reducer

4)

Bushing

A

1)

Eccentric reducer, flat side down

35
Q

At what state should the bleed valve, on a double block and bleed valve, be in during normal process operations?

1)

Open

2)

Closed

3)

Removed

4)

Throttled

A

2)

Closed

36
Q

What is the purpose of a siphon mounted upstream of pressure controls?

1)

Eliminate steam pressure from acting on the controls

2)

Reduce steam temperature acting on the controls

3)

Remove vibration from acting on the controls

4)

Prevent air from acting on the controls

A

2)

Reduce steam temperature acting on the controls

37
Q

What is the primary use of an autoclave?

1)

Cooking

2)

Heating

3)

Processing

4)

Sterilization

A

4)

Sterilization

38
Q

What type of equipment does a jacketed steam tracer act as?

1)

Reheater

2)

Condenser

3)

Economizer

4)

Heat exchanger

A

4)

Heat exchanger

39
Q

How is heat tracing used to prevent piping or a system from freezing classified?

1)

Non-critical

2)

Temporary

3)

Critical

4)

Safety

A

1)

Non-critical

40
Q

Where is makeup water on a low pressure steam boiler introduced?

1)

Above the normal operating water level (NOWL)

2)

Below the normal operating water level (NOWL)

3)

In the cross tee above the low water cut-off (LWCO)

4)

In the cross tee below the low water cut-off (LWCO)

A

2)

Below the normal operating water level (NOWL)

41
Q

How many pounds of condensate per hour would a trap need to discharge if the HTU was rated for 350,000 btu/h at 8psi?

1)

322 lbs./h

2)

366 lbs./h

3)

644 lbs./h

4)

732 lbs./h

A

4)

732 lbs./h

42
Q

In an atmospheric system, how many BTUs would be required to raise 67lbs. (147.4 kg) of ice at -37°f (-38.3°C) to 67lbs. (147.4 kg)of steam at 242°f (116.6°C)?

1)

15,350 BTUs

2)

90,000 BTUs

3)

93,360 BTUs

4)

100,000 BTUs

A

2)

90,000 BTUs

43
Q

How many BTUs are required to raise the temperature of a fluid with a specific heat of 1.3 and a weight of 32 lbs. (70.4 kg) from 84°f (29°C) to 112°f (44°C)?

1)

896 BTUs

2)

1,165 BTUs

3)

2,487 BTUs

4)

3,584 BTUs

A

2)

1,165 BTUs

44
Q

How is the capacity of a low pressure steam safety valve stated?

1)

BTU/h

2)

Lbs./h

3)

Cubic feet per hour

4)

D

A

2)

Lbs./h

45
Q

If the boiler water shows at the middle of the gauge glass on a low pressure boiler, at what level is the water within the boiler?

1)

The boiler is flooded

2)

At the normal operating water line

3)

Below the normal operating water line

4)

Above the normal operating water line

A

2)

At the normal operating water line

46
Q

What should been seen when opening the lowest trycock on a water column if the low pressure steam boiler is operating at its normal operating water line (NOWL)?

1)

Air

2)

Steam

3)

Water

4)

Water and steam

A

3)

Water

47
Q

What are economizers in large steam power plants used for?

1)

Increase the pressure of the steam

2)

Increase the temperature of the steam

3)

Increase the pressure of the boiler feedwater

4)

Increase the temperature of the boiler feedwater

A

4)

Increase the temperature of the boiler feedwater

48
Q

What is the function of a desuperheater?

1)

Raise steam temperature

2)

Lower steam Temperature

3)

Raise steam pressure

4)

Lower steam pressure

A

2)

Lower steam Temperature

49
Q

How often should a surface blowdown take place?

1)

Once per shift

2)

Twice per shift

3)

Once per day

4)

Continuously

A

4)

Continuously

50
Q

What are surface blowdowns used to mitigate?

1)

Excessive water temperatures

2)

Low steam pressures

3)

Condensate return

4)

Priming

A

4)

Priming

51
Q

Because of the large volume of water contained within it, what type of boiler is most likely to cause an explosion?

1)

Firetube

2)

Cast iron

3)

Watertube

4)

Membrane

A

1)

Firetube

52
Q

What is defined as “the pressure at which the density of water and steam are the same”?

1)

Maximum allowable working pressure (MAWP)

2)

Atmospheric pressure

3)

Absolute pressure

4)

Critical pressure

A

4)

Critical pressure

53
Q

What would result in a higher boiling point within a boiler?

1)

Higher steam pressure

2)

Larger steam space

3)

Smaller volume

4)

Larger volume

A

1)

Higher steam pressure

54
Q

What is energy from exhaust flue gases commonly used to heat in a steam power plant?

1)

office space

2)

combustion air

3)

condenser water

4)

water treatment process

A

2)

combustion air

55
Q

What holds a thermodynamic trap in the open position?

1)

gravity

2)

flash steam

3)

venture effect on disc chamber

4)

momentum of the condensate

A

4)

momentum of the condensate

56
Q

Where is the discharge from the high-pressure steam boiler’s continuous blowdown initially directed to?

1)

Mud drum

2)

Sewer system

3)

Blowdown tank

4)

Accumulator tank

A

3)

Blowdown tank

57
Q

Where is low pressure flash steam created in a high pressure steam system to provide steam for the low pressure system?

1)

Flash tank

2)

Superheater

3)

Steam drum

4)

Accumulator tank

A

1)

Flash tank

58
Q

What type of steam travels to the condenser in a steam generating power plant?

1)

Exhaust

2)

Reheated

3)

Saturated

4)

Superheated

A

1)

Exhaust

59
Q

Which type of steam temperature control utilizes indirect heat transfer in a steam generating power plant?

1)

Reheater

2)

Deaerator

3)

Attemperator

4)

Desuperheater

A

3)

Attemperator

60
Q

What is the piece of equipment used in a high pressure steam system that requires dry steam?

1)

Automatic non-return valves

2)

Pressure reducing stations

3)

Desuperheaters

4)

Superheaters

A

4)

Superheaters

61
Q

Where are feedwater pumps installed in relation to a deaerator to provide positive pressure at the inlet of the pumps?
Incorrect Response
1)

Above

2)

Below

3)

Beside

4)

Behind

A

2)

Below

62
Q

What piece of equipment can feedwater be pumped through to ensure a relatively high temperature by the flue gases?

1)

Deaerator

2)

Surge tank

3)

Economizer

4)

Feedwater heater

A

3)

Economizer

63
Q

During an initial inspection of a steam boiler with 225 ft3 of heating surface, it was observed that the feedwater line was installed using ½ in. pipe. What action should be taken?

1)

Mark “OK” and proceed with inspection

2)

Proceeded with commissioning

3)

Re-pipe line with 3/4 in. pipe

4)

Re-pipe line with 1 in. pipe

A

3)

Re-pipe line with 3/4 in. pipe

64
Q

What is the part on the valve disc of a safety relief valve that is used to increase total force and provided the “pop” opening?

1)

spring area

2)

valve bonnet

3)

A

4)

huddling chamber

65
Q

What type of valve should be used as the main steam stop valve?

1)

Control

2)

Check

3)

Globe

4)

Gate

A

4)

Gate

66
Q

Steam pressure increases when superheated.
1) True

2) False
A

2) False

67
Q

What piece of equipment is used in larger high pressure steam plants where there are many sources from which condensate returns to the boiler room?

1)

Surge tank

2)

Feed pump

3)

Condenser

4)

Economizer

A

1)

Surge tank

68
Q

Which device vents excess steam to atmosphere in a flash steam system?

1)

Pressure reducing valve

2)

Back pressure valve

3)

Swing check valve

4)

Safety relief valve

A

2)

Back pressure valve

69
Q

What type of heat does a desuperheater control?

1)

Latent

2)

Sensible

3)

Specific

4)

Relative

A

2)

Sensible

70
Q

On a high-pressure steam system utilizing a steam driven pump what would be the purpose of a condensate accumulator?

1)

Protect the pump impellor

2)

Collect exhaust gases

3)

Reduce erosion of the turbine

4)

Increase efficiency of steam power

A

1)

Protect the pump impellor

71
Q

When determining the performance of a steam trap it was determined that there was no temperature drop between the inlet and outlet of the trap. It could be determined that the trap needs service.

1) True

2) False
A

1) True

72
Q

What is the recommended change in pipe size for a pressure reducing valve?

1)

1 or 2 pipe sizes

2)

2 or 3 pipe sizes

3)

3 or 4 pipe sizes

4)

4 or 5 pipe sizes

A

1)

1 or 2 pipe sizes

73
Q

What is the closing force on a steam pressure reducing valve (PRV)?

1)

Relief pressure
Incorrect Response
2)

Up steam pressure

3)

Pressure equilibrium

4)

Downstream pressure

A

4)

Downstream pressure

74
Q

What is the required valve sequence up stream of a steam pressure reducing valve (PRV) station?

1)

Check valve, gate valve, strainer

2)

Gate valve, steam trap, strainer

3)

Union, strainer, check valve

4)

Gate valve, strainer, union

A

4)

Gate valve, strainer, union

75
Q

What size must the discharge pipe from a drip pan elbow on a pop safety valve (PSV) be?

1)

Equal to the outlet size of the PSV

2)

One size smaller than the outlet of the PSV

3)

One size larger than the outlet of the PSV

4)

Two sizes larger than the outlet of the PSV

A

4)

Two sizes larger than the outlet of the PSV

76
Q

Where is the relief valve located on an economizer that is being used for preheating feed water?

1)

Above the normal operating water level (NOWL)

2)

Below the normal operating water level (NOWL)

3)

Between the discharge connection of the economizer and the inlet of the boiler

4)

Between the discharge connection of the deaerator and the economizer

A

3)

Between the discharge connection of the economizer and the inlet of the boiler

77
Q

What is defined as “The amount of heat required to convert 34.5 pounds of water at 212 degrees Fahrenheit into steam at atmospheric pressure”?

1)

EDR

2)

BTUH

3)

IBR

4)

BHP

A

4)

BHP

78
Q
A

pipefitting (8 decks)

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