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26 Cards in this Set

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How many types of air are used in the combustion process and what are they called?

Primary air and secondary air

When using a forced draft system the furnace is under _________ pressure. This type of furnace construction is called a _________ furnace.

Positive pressure


Pressurized furnace

What simple device can be used to measure pressure in the combustion air system?

"U" tube manometer

Standards with respect to the required openings in buildings for supply of adequate combustion air for oil burning appliances can be found.


A. CSA 139.1


B. CSA 146.2


C. CSA 148.1


D. CSA 149.1

A. CSA 139.1

Standards with respect to the required openings in buildings for supply of adequate combustion air for gas burning appliances can be found.


A. CSA 139.1


B. CSA 146.2


C. CSA 148.1


D. CSA 149.1

D. CSA 149.1

The code that specifies the size of openings required for a boiler room when using multiple heating units

CSA code B-51

In a balanced draft system, the forced draft fan is:


1) Smaller than the induced draft fan


2) Designed to handle hot combustion gases


3) Larger than the induced draft fan


4) Subjected to the products of combustion and high temperatures


5) The same size as the induced draft fan

1) Smaller than the induced draft fan

Balanced draft:


1) Means furnace pressure is maintained slightly below atmospheric pressure


2) Requires an FD and ID fan, never just an FD fan


3) Means air flow is always constant


4) Means air and fuel quantities are the same per unit time


5) Can be accomplished with just a chimney


1) Means furnace pressure is maintained slightly below atmospheric pressure

A draft gauge on a furnace indicates the draft in:


1) Inches of water per square metre


2) mm of mercury column


3) mm of water column


4) Kilograms per square centimetre


5) psi

3) mm of water column

What are the advantages of mechanical draft?


1. Dependence on atmospheric air temperatures


2. Independence of chimney temperatures


3. Better draft regulation


4. Can be accurately regulated


A) 1, 2, 3, 4


B) 1, 2, 3


C) 2, 3, 4


D) 1, 3, 4


E) 3, 4


C) 2, 3, 4


Variable speed couplings:


1) Rave a low initial cost


2) Use a variable speed driver


3) Are usually found in small boilers


4) Require the least amount of energy when a variable speed motor drives the fan


5) Require a remote speed controller


4) Require the least amount of energy when a variable speed motor drives the fan

In a balanced draft system, the air heater is placed:


1. Between ID fan and stack


2. Between ID fan and boiler


3. Between forced draft fan and boiler


4. On inlet ducting to forced draft fan


A) 1, 4


B) 2, 3


C) 2, 3, 4


D) 2


E) 1, 2, 3


B) 2, 3

Relative to draft, a steam jet is very popular:


1) As a forced draft unit


2) For increasing furnace pressure


3) As a fuel atomizer


4) On railway steam locomotives


5) For decreasing draft during cold weather


4) On railway steam locomotives

A diaphragm draft gauge on a furnace indicates the draft in:


1) mm water per square metre


2) MPa


3) mm of water column


4) kPa


5) mm of mercury column


3) mm of water column

Primary air:


1) Enters the furnace before the fuel


2) Is premixed with fuel before being admitted to the furnace


3) Is supplied in the combustion zone


4) Is the same as excess air


5) Is supplied with all types of burners

2) Is premixed with fuel before being admitted to the furnace

Inlet damper control on a fan:


1) Is used on forced draft fans only


2) Can only be used when the fan is driven by a steam turbine


3) Requires more power to drive the fan when the vanes are closed


4) Is less complicated than outlet damper control


5) Requires less power to drive the fan at reduced loads

5) Requires less power to drive the fan at reduced loads

With fan output damper control:


1) The fan air pressure decreases with a decrease in air flow


2) Flue gas velocity will rise


3) The fan air pressure increases with a decrease in air flow


4) It is placed in the inlet side of the fan


5) Fan output is difficult to control

3) The fan air pressure increases with a decrease in air flow


Chimneys are commonly lined with:


1) Insulation


2) Concrete


3) Mortar


4) Common brick


5) Clay lining


5) Clay lining

A more durable chimney for a power plant application is the _____ chimney.


1) Steel


2) Insulated


3) Brick


4) Guy wire supported


5) Reinforced concrete


5) Reinforced concrete

The most efficient operation of a fan demands that:


1) Inlet damper controls are used


2) Gaseous fuels are fired


3) Outlet damper controls are used


4) The speed be only sufficient enough to supply the required amount of air


5) Constant speed electric motors are used

4) The speed be only sufficient enough to supply the required amount of air

A diaphragm type pressure gauge:


1) Cannot be used for pressures greater than atmospheric


2) Operates on a mercury column


3) Is used for very small pressures


4) Is used for high pressures


5) Is only found on large steam generators

3) Is used for very small pressures

With fan output damper control:


1) Fan output is difficult to control


2) The fan air pressure increases with a decrease in air flow


3) Flue gas velocity will rise


4) The fan air pressure decreases with a decrease in air flow


5) It is placed in the inlet side of the fan

2) The fan air pressure increases with a decrease in air flow

When a diaphragm draft gauge is used to measure furnace draft:


1) It can only be used on a forced draft system


2) It can only be used for positive pressures


3) It can only be used on a balanced draft system


4) The furnace draft connection is on one side of the diaphragm


5) Furnace draft connections are on both sides of the diaphragm

4) The furnace draft connection is on one side of the diaphragm

When the least amount of energy is desired to drive a fan with variable output control, the type of control used would most likely be:


1) A variable speed coupling


2) A variable speed driver


3) Outlet damper control


4) Inlet damper control


5) Register control

1) A variable speed coupling

The most efficient operation of a fan occurs when:


1) Speed is just enough to meet the demand


2) Draft is FD only


3) Draft is ID only


4) Speed is at maximum


5) Draft is balanced

1) Speed is just enough to meet the demand

The purpose of the uptake damper is to:


1) Control the furnace pressure


2) Supply combustion air to the furnace


3) Decrease flue gas velocity


4) Control fan output


5) Prevent a back flow of gasses from the chimney

3) Decrease flue gas velocity