Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

4th Class Canada (Part A) > Test Questions Part 2 > Flashcards

Test Questions Part 2 Flashcards

1
Q

_____________ are used to connect pipes of the same diameter, creating a straight run of pipe.

Nipples

Couplings

Bushings

Elbows

A

Couplings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The _______ fan blows combustion air into the wind box of a boiler.

Induced draft

High pressure

Balanced draft

Forced draft

A

Forced draft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

As compared to a cooler water sample, warmer water:

is more dense

cannot hold as much dissolved oxygen

has a lower vapour pressure

is not considered a major pollutant

A

cannot hold as much dissolved oxygen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Combustion of fuel in a boiler furnace:

Requires a higher air-fuel ratio than a diesel engine

Should occur with a minimum of excess air

Is perfect when the stack gases are free of moisture

Requires mechanical draft

A

Should occur with a minimum of excess air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

A _____ is a water filled section, which surrounds the firebox in a locomotive boiler.

Crown sheet

Boiler drum

Steam dome

Water leg

A

Water leg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The balanced equation for the incomplete combustion of carbon is:

C + O2 = CO2 + heat

2C + O2 = CO + heat

C + 2O2 = 2CO + heat

2C + O2 = 2CO + heat

A

2C + O2 = 2CO + heat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Synchronous motors have construction that is identical to:

DC series motors

DC shunt motors

AC induction motors

Alternators

A

Alternators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

One of the advantages of the refractory (gas) burner is:

The air and gas mixture is thoroughly preheated before it enters the furnace

The flue gases are re-circulated back to the furnace to increase the furnace temperature

The flue gases are thoroughly post-heated before it leaves the furnace

The flame is directed to areas where it is needed the most

A

The air and gas mixture is thoroughly preheated before it enters the furnace

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Limestone, when added to a fluidized bed boiler

Lowers the combustion bed temperature

Acts as a de-sulphuring agent

Absorbs NOx

Reduces greenhouse gas emissions

A

Acts as a de-sulphuring agent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Combustion air for the burners is preheated in the _____ by hot flue gases.

Economizer

Air heater

Superheater

Windbox

A

Air heater

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When working with high voltages the following precautions should be observed:

access should be locked, allowing only authorized personnel to enter

remove all grounding straps before proceeding with the work

only allow workers from the utility to work on the equipment

make sure the voltages are safe before contacting live conductors

A

access should be locked, allowing only authorized personnel to enter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which of the following is NOT necessary for complete combustion of a fuel?

The temperature of the furnace must be high enough

The combustion air must be preheated

Enough time must be allowed for the fuel to burn

The air and fuel must mix thoroughly

A

The combustion air must be preheated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which of these is not a steam drum internal component?

Chemical feed pipe

Chevron dryer

Baffle

Intermittent blow off line

A

Intermittent blow off line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Utility companies have a surcharge to their customers based on:

The maximum amperage used

System capacitance

Transformer efficiency

Peak power demand

A

Peak power demand

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

An intermittent pilot:

Lights the main flame then extinguishes

Must be manually ignited

Lights the main flame and remains on until the main flame is extinguished

Remains on after the main flame extinguishes

A

Lights the main flame and remains on until the main flame is extinguished

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

An operating current transformer should never:

Be inspected until properly grounded

Have its primary circuit opened

Produce excessively high voltages

Have its secondary circuit opened first

A

Have its secondary circuit opened first

17
Q

When do fabric filters reach their best efficiency?

when the layer of dust is building up

just after they are installed

just after washing

when they are first installed

A

when the layer of dust is building up

18
Q

The extended surfaces on the flat surface of the sections of a cast iron sectional boiler are used for the purpose of increasing the:

Heating surface area

Steam space

Water space

Water circulation

A

Heating surface area

19
Q

When tightening the bolts on a pipe flange:

Tighten every second bolt first, then tighten the others

The gasket should be held in place by gasket glue

The top bolts must be tightened first

Use a sequential criss-cross method of tightening

A

Use a sequential criss-cross method of tightening

20
Q

The information found in Column 8 (labeled Hf)of Table 1 of the Steam Tables is the:

Sensible heat

Latent heat

Specific heat

Latent heat of fusion

Latent heat of evaporation

A

Sensible heat

21
Q

Carbon dioxide fire extinguishers:

Are self-expelling

Are the best for Class “A” fires

Are the quietest in operation

Present no hazards during use

A

Are self-expelling

22
Q

A corrugated furnace gives required strength with thinner metal, increases heating surface and:

Increases the boiler mass

Adds to the overall material cost of the unit

Decreases combustion turbulence

Allows for differential expansion and contraction

A

Allows for differential expansion and contraction

23
Q

The steam produced by an electrode type boiler depends on the:

Voltage supplied to the immersion elements

Level of water in the basket

Number of heating elements energized

Number of electrodes energized

A

Level of water in the basket

24
Q

The efficiency of a combined cycle plant, using a pressurized fluidized bed boiler, is about _____ higher than that of a conventional pulverized coal plant.

20%

15%

10%

5%

A

5%

25
Q

The sections of a cast iron sectional boiler are held together by:

Cast iron pipes

Steel studs

tie rods

Stay bolts

A

tie rods

26
Q

The maximum voltage generated by a single loop DC generator occurs, when the conductor is cutting the magnetic lines of force at an angle of:

0°

45°

90°

120°

A

90°

27
Q

An interrupted pilot of an automatic boiler:

Burns continuously, like that in a home furnace

Ignites before the main burner ignites, and is extinguished when the main burner is extinguished

Is one that has been extinguished by an inadequate flame signal

Ignites, is proven stable and extinguishes after the main flame is established

A

Ignites, is proven stable and extinguishes after the main flame is established

28
Q

An area in which the atmosphere contains dust in concentrations high enough to produce explosive or ignitable mixtures, has an Electrical Classification of:

Class 1

Class 2

Class 3

Class 4

A

Class 2

4th Class Canada (Part A) (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions