Book 2: Unit 1 - Review: Flashcards

1
Q

Conduction heat gains are based on the assumption that the temperature of the outer surface of the building is the same as the:
Select one:

A. Average of winter and summer temperatures

B. Outdoor design condition

C. Warmest summer temperature

D. Indoor design temperature

E. Coldest winter temperature

A

B. Outdoor design condition

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2
Q

Some heat is also _____ from the warm convector cabinet surface.
Select one:

A. Radiated

B. Constructed

C. Conducted

D. Ventilated

E. Humidified

A

A. Radiated

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3
Q

In the series loop hot water heating system, the heating units are:
Select one:

A. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler

B. Equipped with its own circulating pump

C. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler

D. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection

E. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main

A

E. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main

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4
Q

The piping and heating units of a steam heating system must be so arranged that:
Select one:

A. Steam can flow in sufficient quantities to all heating units

B. The condensate can be returned freely to these units

C. The air can be contained in the heating units and piping

D. The condensate can flow freely from the boiler

E. Steam can flow freely from all heating units

A

A. Steam can flow in sufficient quantities to all heating units

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5
Q

Activated alumina chemisorbant is particularly suitable for the removal of:
Select one:

A. N2

B. CO2

C. CO

D. H2S

E. O2

A

D. H2S

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6
Q

The _____ outlets should be located to prevent cold drafts from walls and windows and to maintain even temperatures in the rooms.
Select one:

A. Plenum

B. Register

C. Supply

D. Grille

E. Return

A

C. Supply

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7
Q

The natural air intake mechanical exhaust system of ventilation has the disadvantage that the fresh air drawn into the building through windows:
Select one:

A. Is neither filtered nor heated

B. Enters silently

C. Is natural and no power is required

D. Provides a cooling breeze

E. Is fresh air

A

A. Is neither filtered nor heated

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8
Q

Modern radiators are made of:
Select one:

A. Light steel pressings welded together

B. Aluminum

C. Cast iron

D. Magnesium

E. Copper

A

A. Light steel pressings welded together

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9
Q

Building heat losses can be reduced to a large extent by adding a layer, or layers, of:
Select one:

A. Building wrap

B. Paint

C. Insulation

D. Wall paper

E. Glass

A

C. Insulation

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10
Q

The admission of fresh air into a room should be such that:
Select one:

A. The air strikes directly on the occupants

B. The air is spread over the ceiling area

C. Stagnant pockets of air are created

D. The air is spread over the floor area

E. The air does not strike directly on the occupants

A

E. The air does not strike directly on the occupants

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11
Q

An outdoor thermostat should be incorporated in the control system to protect the snow melting system from accidental operation during warm weather, by turning the system off when outdoor ambient temperature rises above:
Select one:

A. 15°C (59°F)

B. 2°C (35.6°F)

C. 10°C (50°F)

D. 5°C (41°F)

E. 0°C (32°F)

A

B. 2°C (35.6°F)

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12
Q

A steam to hot water heating converter is usually a _____ heat exchanger.
Select one:

A. Convector

B. Fire tube

C. Shell and tube

D. Radiator

E. Water tube

A

C. Shell and tube

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13
Q

A fin coil consists of one or more rows of parallel tubes fitted with fins to _____ exchange.
Select one:

A. Increase the flow rate

B. Increase the temperature

C. Decrease the rate of heat

D. Decrease the temperature

E. Increase the rate of heat

A

E. Increase the rate of heat

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14
Q

When dealing with electrical controls relay refers to:
Select one:

A. A device used to change AC voltage from one value to another

B. A term that refers to wiring or other electrical devices using 30 volts or less

C. A device consisting of a solenoid coil, which operates load carrying contacts when the coil is energized

D. A term that refers to the normal electric supply voltage

E. The electric switch configuration of a relay

A

C. A device consisting of a solenoid coil, which operates load carrying contacts when the coil is energized

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15
Q

One of the advantages of a forced warm air heating system is:
Select one:

A. The ducts can not be enclosed within walls and ceilings

B. The furnace must be located on the same floor

C. A more uniform temperature distribution can be obtained

D. The air can not be humidified

E. The air can not be cleaned by filters

A

C. A more uniform temperature distribution can be obtained

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16
Q

In modern installations the cast-iron radiator has largely been replaced by the:
Select one:

A. Space heater

B. Ventilator

C. Hot air furnace

D. Convector

E. Unit heater

A

D. Convector

17
Q

In buildings covering large areas the resistance to flow of the condensate in the return piping is quite high and _____ pumps are often used to assist the condensate flow.
Select one:

A. Centrifugal

B. Lobe

C. Turbine

D. Vacuum

E. Positive displacement

A

D. Vacuum

18
Q

In the convector air circulates naturally without the aid of a fan a process that is called:
Select one:

A. Humidification

B. Convection

C. Conduction

D. Ventilation

E. Radiation

A

B. Convection

19
Q

The admission of fresh air into a room should be such that:
Select one:

A. The air is spread evenly over the whole area

B. The air is spread over the floor area

C. The air strikes directly on the occupants

D. Stagnant pockets of air are created

E. The air is spread over the ceiling area

A

A. The air is spread evenly over the whole area

20
Q

A good rule of thumb for determining the proper tension of driving belts on blowers less than 1 kW in warm air furnaces is that for every 16 cm (6.3 in) of distance between the pulley rims, the belt should have about _____ of vertical movement when pushed vertically halfway between the pulleys.
Select one:

A. 0.5 cm (0.2 in)

B. 1.5 cm (0.6 in)

C. 1 cm (0.4 in)

D. 2 cm (0.8 in)

E. 2.5 cm (1 in)

A

C. 1 cm (0.4 in)