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Power Engineering 5th Class Book 1 > Book 1: Unit 1 - Review: Chapter 1 - 4 > Flashcards

Book 1: Unit 1 - Review: Chapter 1 - 4 Flashcards

1
Q

The vertical firetube boiler has a cylindrical shell with tubes connected between the:
Select one:

A. Crown sheet and the barrel

B. Steam drum and the mud drum

C. Front and rear tube sheets

D. Upper and lower tube sheets

E. Crown sheet and the shell

A

D. Upper and lower tube sheets

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2
Q

A modular cast-iron heating boiler:
Select one:

A. Has a number of burners that operate together

B. Consists of a number of horizontal sectional cast-iron boilers

C. Cannot be enclosed in a single casing

D. Does not have continuous water flow through each section

E. Is constructed with a number of individual sections

A

B. Consists of a number of horizontal sectional cast-iron boilers

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3
Q

The HRT boiler is inefficient to operate due to:
Select one:

A. The labour required to construct the brickwork

B. The gas passes were too few

C. Heat loss through the brick setting was too high

D. The gas passes were to long

E. The coal fired grates

A

C. Heat loss through the brick setting was too high

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4
Q

The copper tubular boiler finds application in:
1. Residential hot water heating systems
2. Commercial hot water heating systems
3. Industrial hot water heating systems
4. Domestic hot water supply
5. High pressure steam production
Select one:

A. 3, 4, 5

B. 2, 3, 4

C. 1, 2, 4

D. 1, 2, 3

E. 1, 2, 3, 5

A

C. 1, 2, 4

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5
Q

The stampings on a packaged firetube boiler may indicate a Maximum Allowable Working Pressure (MAWP) of 1000 kPa (145 psi), but the applicable code or Certificate of Inspection may show a MAWP of:
Select one:

A. 160 kPa (23.2 psi)

B. 1100 kPa (159.5 psi)

C. 103 kPa (14.7 psi)

D. 1000 kPa (145 psi)

E. 100 kPa (14.5 psi)

A

C. 103 kPa (14.7 psi)

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6
Q

One of the characteristics of a firetube boiler is:
Select one:

A. Their large water capacity makes them slow in coming up to operating pressure

B. Their large water capacity makes them fast in coming up to operating pressure

C. The small amount of heat stored in the water makes it possible to meet load changes quickly

D. Their small water capacity makes them fast in coming up to operating pressure

E. Their small water capacity makes them slow in coming up to operating pressure

A

A. Their large water capacity makes them slow in coming up to operating pressure

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7
Q

In the electrode type electric boiler the electrodes are located in the:
Select one:

A. Central generating chamber

B. Watertube section

C. Firetube section

D. Windbox

E. Firebox

A

A. Central generating chamber

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8
Q

The longitudinal drum boiler is a _____ combustion gas pass boiler.
Select one:

A. Two

B. Five

C. Four

D. Three

E. One

A

D. Three

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9
Q

The cylindrical portion of the Locomotive boiler that connected the furnace to the smoke box was termed the:
Select one:

A. Barrel

B. Furnace

C. Crown sheet

D. Fire door

E. Firetube

A

A. Barrel

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10
Q

The electrode type electric boiler consists of two cylindrical chambers:
Select one:

A. The inner one forming the regulating compartment and the other the generating compartment

B. The inner one forming the generating compartment and the other the regulating compartment

C. The inner one forming the steam compartment and the other the generating compartment

D. The inner one forming the regulating compartment and the other the steam compartment

E. The inner one forming the fire compartment and the other the generating compartment

A

B. The inner one forming the generating compartment and the other the regulating compartment

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11
Q

Today the dry-back version of the Scotch Marine boiler is extremely popular with many manufacturers due to:
Select one:

A. The simplicity of construction

B. The firetube design

C. Its flexibility

D. The watertube design

E. The high pressure operation

A

A. The simplicity of construction

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12
Q

Small capacity heating boilers operate most efficiently at:
Select one:

A. Approximately 25% load

B. Approximately 50% load

C. Approximately 75% load

D. Continuous full load

E. Any load condition

A

D. Continuous full load

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13
Q

The Locomotive boiler has a furnace that is:
Select one:

A. Not part of the pressure shell

B. External

C. Partially surrounded by brickwork

D. Almost completely surrounded by water

E. Called a firetube

A

D. Almost completely surrounded by water

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14
Q

An immersion-type electric boiler has:
Select one:

A. Tube bundles

B. No steam space

C. Water tubes

D. Elements

E. Electrodes

A

D. Elements

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15
Q

A machined and slightly tapered piece of pipe found in cast-iron sectional heating boilers is referred to as a:
Select one:

A. Push nipple

B. Tie bolt

C. Tie rod

D. Tapered bushing

E. Pipe nipple

A

A. Push nipple

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16
Q

A disadvantage of condensing boilers is that:
Select one:

A. The boilers are more expensive than customary boilers

B. The heat exchangers in them are quite small

C. Any moisture in the flue gases will not condense out

D. Less heat is extracted from the hot flue gases

E. The boilers are less expensive than customary boilers

A

A. The boilers are more expensive than customary boilers

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17
Q

Water circulation in the longitudinal drum boiler is created by:
Select one:

A. Higher density feedwater

B. The water circulation pump

C. Higher density boiler water

D. Lower density feedwater

E. Direction of feedwater supply

A

A. Higher density feedwater

18
Q

In an immersion-type electric boiler scale tends to form on the:
Select one:

A. Walls of the basket

B. Electrodes

C. Watertube bundles

D. Firetube bundles

E. Elements

A

E. Elements

19
Q

The crown sheet of a Locomotive boiler was held in place by:
Select one:

A. Radial stays

B. Fusible plugs

C. Longitudinal stays

D. Stay bolts

E. Grates

A

A. Radial stays

20
Q

The combustion chamber of the serpentine watertube boiler is:
Select one:

A. Located between the water tubes

B. Stoker fired

C. Located below the water tubes

D. Surrounded by the water tubes

E. Downstream of the windbox

A

C. Located below the water tubes

21
Q

Cast-iron sectional boilers have flue gas passages which:
Select one:

A. Increase heat transfer

B. Are smooth to increase combustion gas flow

C. Act as boiler water legs

D. Are often termed “breeching”

E. Receive radiant heat only

A

A. Increase heat transfer

22
Q

In the firetube boiler _____ pass through the tubes.
Select one:

A. Fuel oil

B. Fuel gas

C. Feedwater

D. Hot gases

E. Hot air

A

D. Hot gases

23
Q

In the HRT boiler the hot combustion gases pass:
Select one:

A. Along the underside of the drum and return through the firetubes to the boiler grate

B. Along the underside of the drum and return through the firetubes to the boiler stack

C. Through the firetubes and return along the underside of the drum to the boiler stack

D. Through the firetubes and return along the underside of the drum to the boiler grate

E. Along the underside of the drum and return through the firetubes to the economizer

A

B. Along the underside of the drum and return through the firetubes to the boiler stack

24
Q

In order to reduce extensive heat losses from the externally fires furnace walls:
Select one:

A. The furnace grate was placed inside the enlarged return flue

B. The furnace walls were lined with refractory

C. More firetubes were added

D. The furnace was enlarged

E. The furnace was made longer

A

A. The furnace grate was placed inside the enlarged return flue

25
Q

Early HRT boilers were fired using:
Select one:

A. Natural gas

B. Wood stokers

C. Pulverized coal

D. Coal on grates

E. Fuel oil

A

D. Coal on grates

26
Q

A main disadvantage of an electric boiler is the:
Select one:

A. Requirement for duct work and chimneys

B. Inefficiency of the energy transfer

C. High cost of the electricity

D. High cost of manufacturing

E. Space requirement per unit output

A

C. High cost of the electricity

27
Q

The lower tubes of the serpentine watertube boiler are exposed to the _____ heat from the fire.
Select one:

A. Convection

B. Radiant and conduction

C. Radiant

D. Convection and conduction

E. Conduction

A

C. Radiant

28
Q

Vertical firetube boilers have an advantage when _____ is limited.
Select one:

A. Weight

B. Floor space

C. Pressure

D. Temperature

E. Height

A

B. Floor space

29
Q

The American Boiler Manufacturing Association defines a packaged firetube boiler as a modified __________ boiler, engineered, built, and fire tested before shipment and guaranteed in material, workmanship, and performance by one firm, with one manufacturer furnishing and assuming responsibility for all components in the assembled unit.
Select one:

A. Locomotive

B. Scotch-type

C. Vertical Firetube

D. HRT

E. Firebox

A

B. Scotch-type

30
Q

The top of the furnace in a Locomotive boiler was termed the:
Select one:

A. Uptake

B. Crown sheet

C. Firebox

D. Barrel

E. Smoke box

A

B. Crown sheet

31
Q

One of the advantages of the serpentine watertube boiler is that the design it:
Select one:

A. Produces a smaller foot print

B. Eliminates expansion and contraction stress

C. Is capable of very high steam pressures

D. Decreases the height of the boiler

E. Increases the water capacity of the boiler

A

B. Eliminates expansion and contraction stress

32
Q

The “D” type boiler is constructed with _____ drums.
Select one:

A. Three

B. Five

C. Four

D. Two

E. One

A

D. Two

33
Q

The forerunner of the modern packaged firetube boiler was the _____ boiler.
Select one:

A. Firebox

B. Scotch Marine

C. Locomotive

D. HRT

E. Water box

A

B. Scotch Marine

34
Q

Which of the following are advantages of packaged watertube boilers?
1. Ease of installation
2. One supplier supplies all components
3. Built with all of the necessary fittings
4. Warranties and similar items are easy to deal with
Select one:

A. 3, 4

B. 1, 2, 3, 4

C. 1, 2

D. 2, 3, 4

E. 1, 2, 4

A

B. 1, 2, 3, 4

35
Q

The boilers in multiple boiler heating plants are operated:
Select one:

A. Individually by separate controllers

B. By the outdoor temperature

C. Manually as required

D. In sequence by a step controller

E. By temperature controllers

A

D. In sequence by a step controller

36
Q

An advantage of a multiple heating boiler plant is:
Select one:

A. That with a small water content a pressure part failure will cause more damage

B. Most low capacity can be moved through standard sized doorways

C. That they have a large water capacity

D. They are light requiring a minimal foundation

E. The boilers are heavy requiring special foundations

A

B. Most low capacity can be moved through standard sized doorways

37
Q

The “A” type boiler is constructed with _____ drums.
Select one:

A. Two

B. Four

C. Five

D. One

E. Three

A

E. Three

38
Q

The tubes of a serpentine watertube boiler are connected to the upper and lower headers by:
Select one:

A. Silver solder

B. Crosby clips

C. Threaded connections

D. Welding

E. Four bolt flanges

A

C. Threaded connections

39
Q

Output of an immersion electric boiler is regulated by altering the:
Select one:

A. Water level relative to the elements

B. Water level relative to the electrodes

C. Amount of current flowing through the elements

D. The voltage applied to the boiler

E. Amount of current flowing through the water

A

C. Amount of current flowing through the elements

40
Q

As per applicable code the pressure and temperature limiting factors for steam and hot water heating boilers are:
Select one:

A. 1103 kPa (160 psi) for steam and 103 kPa or 121˚C (14.7 or 250˚F) for hot water

B. 1103 kPa or 121˚C (160 psi or 250˚F) for steam and 1103 kPa (160 psi) for hot water

C. 121 kPa or 103˚C (17.5 or 217˚F) for steam and 1103 kPa (160 psi) for hot water

D. 103 kPa (15 psi) for steam and 121˚C or 1100 kPa (250˚F or 160 psi) for hot water

E. 100 kPa (15 psi) for steam and 120˚C or 1100 kPa (250˚F or 160 psi) for hot water

A

D. 103 kPa (15 psi) for steam and 121˚C or 1100 kPa (250˚F or 160 psi) for hot water

Power Engineering 5th Class Book 1 (25 decks)

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