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BCIT 5th class values > Misc. Questions > Flashcards

Misc. Questions Flashcards

1
Q

When the boiler water has cooled to about _____ open the blowdown valves and drain the boiler. Select one:

A. 99°C (210°F)

B. 90°C (194°F)

C. 110°C (230°F)

D. 134°C (273°F)

E. 60°C (140°F)

A

B. 90°C (194°F)

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2
Q

The major components of a typical hot oil system include the furnace, pump, control devices and the: Select one:

A. Relief valve

B. Gas blanket

C. Stack damper

D. Containment dyke

E. Surge tank

A

E. Surge tank

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3
Q

On a hot water heating system the stop/balance check valve is also known as a _____ valve. Select one:

A. Triple duty

B. Pressure balancing

C. Double duty

D. Temperature control

E. Non-return

A

A. Triple duty

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4
Q

The “popping” pressure of a safety valve may be increased by: Select one:

A. Decreasing the spring pressure

B. Increasing the spring pressure

C. Lowering the adjusting ring

D. Raising the lifting lever

E. Raising the adjusting ring

A

B. Increasing the spring pressure

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5
Q

The infrared scanner is mounted on the end of a sighting tube in such a way that its temperature will not exceed: Select one:

A. 50°C (98°F)

B. 100°C (212°F)

C. 75°C (167°F)

D. 120°C (248°F)

E. 150°C (302°F)

A

B. 100°C (212°F)

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6
Q

The high gas pressure cut-off switch can be tested by: Select one:

A. Slowly raising the boiler pressure above the operating setpoint

B. Closing the main gas valve quickly

C. Slowly closing the main gas valve

D. Slowly covering the air supply to the fan

E. Quickly closing the main burner shut-off valve

A

E. Quickly closing the main burner shut-off valve

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7
Q

Clean steam may be used in: Select one:

A. Oil Refineries

B. Humidification systems

C. Gas plants

D. Chemical processes

E. Steam cleaning

A

B. Humidification systems

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8
Q

The blowdown tank is/does: Select one:

a. Does not allow the pressure to be reduced

b. Does not empty into the sewer

c. Not cool the water

d. Is not required on a low pressure boiler

A

d. Is not required on a low pressure boiler

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9
Q

Controls found on heating boilers include:
1. Operating controls
2. Pressure relief controls
3. High limit cut-off switches
4. Condensate level controls
5. Low limit cut-off switches
Select one:

A. 3, 4, 5

B. 1, 2, 3

C. 2, 3, 4

D. 3, 4, 5

E. 1, 3, 5

A

E. 1, 3, 5

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10
Q

The air present in steam lines and equipment must also be removed to prevent: Select one:

A. Corrosion from carbon dioxide

B. Corrosion from oxygen

C. Rusting from carbon dioxide

D. Pitting from carbon dioxide

E. Caustic embrittlement

A

A. Corrosion from carbon dioxide

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11
Q

In the one-pipe 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 the long way around to return to the boiler

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

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

D. Equipped with its own circulating pump

E. 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

A

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

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12
Q

If the boiler water temperature was too low and the burner found to be out a probable cause would not be: Select one:

A. Flame failure device activated

B. Low air switch activated

C. Fuel valve not open

D. Low water cut off activated

E. Operating control set to low

A

E. Operating control set to low

Book says: Insufficient heat: Burner not lit: Setting controls too low or controls defective. Raise setting of temperature control and/or outdoor reset control…

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13
Q

Foreign material in a new system may break down chemically during the operation and if present in sufficient quantities, may cause the water to become: Select one:

A. Alkaline

B. Acidic

C. Soft

D. Hard

E. Dirty

A

B. Acidic

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14
Q

If there is restricted air flow through a heating unit the operator should check all but: Select one:

A. The filter is not plugged

B. Damper plates are fully closed

C. Curtains are restricting the air flow

D. Air passages are not restricted

E. A carpet is not restricting the air flow

A

B. Damper plates are fully closed

A little misleading, Damper plates should be fully open for proper functioning.

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15
Q

The term space heater is generally applied to a fired heater which is installed in the space to be heated and heats the air directly without the use of: Select one:

A. An open flame

B. A blower

C. A combustion chamber

D. Steam or water

E. Any ducting

A

E. Any ducting

B2P6-11

The term space heater is generally applied to a fired heater that is installed in the space to be heated and heats the air directly without the use of any ducting.

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16
Q

In a forced warm air heating system a fresh air supply duct allows a controlled amount of outside air to enter the system: Select one:

A. After it passes through the filter

B. Before it is heated

C. After it is heated

D. Before it passes through the filter

E. After the blower

A

D. Before it passes through the filter

B2P6-3

A fresh air supply duct allows a controlled amount of outside air to enter the system for ventilation purposes. This air mixes with the return air before it passes through the filters.

17
Q

Actual ventilation rates vary from: Select one:

A. 0.14 to 1.1 m³/min (5 to 40 cfm)

B. 0.1 to 1.1 m³/min (3.5 to 40 cfm)

C. 0.14 to 2 m³/min (5 to 71 cfm)

D. 1.4 to 11 m³/min (49 to 388 cfm)

E. 0.1 to 2 m³/min (3.5 to 71 cfm)

A

A. 0.14 to 1.1 m³/min (5 to 40 cfm)

18
Q

The air velocity through a viscous filter of _____ is common. Select one:

A. 2.0 m/s (400 ft/min)

B. 4.0 m/s (800 ft/min)

C. 7.5 m/s (1500 ft/min)

D. 4.5 m/s (900 ft/min)

E. 2.5 m/s (500 ft/min)

A

E. 2.5 m/s (500 ft/min)

19
Q

With the _____ heating method of heating the heat is transferred from the source of heat to the air and/or persons and objects in these areas. Select one:

A. Hot water

B. Steam

C. Radiant

D. Direct

E. Convection

A

D. Direct

B3P9-9

Direct Heating
The electric heating equipment is installed in the areas to be heated. Thus, heat is transferred directly from the source of heat to the air and/or persons and objects in these areas.

20
Q

A disadvantage of the metal sheath electric infrared heating element is its: Select one:

A. Vibration resistance

B. Mounting position

C. Impact resistance

D. Thermal shock resistance

E. Wind resistance

A

E. Wind resistance

21
Q

What is the emission temperature of a directly fired refractory heater? Select one:

A. 980°C - 1260°C (1800°F - 2300°F)

B. 760°C - 900°C (1400°F - 1650°F)

C. 315°C - 455°C (600°F - 850°F)

D. 560°C - 790°C (1040°F - 1450°F)

E. 400°C - 500°C (750°F - 930°F)

A

A. 980°C - 1260°C (1800°F - 2300°F)

22
Q

Calculate the relative humidity of a sample of air that at 21°C (70°F) holds 0.01 kg (0.022 lb) of moisture if the maximum that it can hold at this temperature is 0.015 kg (0.033 lb). Select one:

A. 10.7%

B. 0.33%

C. 25.8%

D. 6.7%

E. 93.3%

A

D. 6.7%

Answer is wrong: 0.01 x 100 / 0.015=66.7

Should be 66.7%

23
Q

The steam pressure on a steam grid humidifier should be in the range of: Select one:

A. 30 kPa to 60 kPa (4.4 to 8.7 psi)

B. 40 kPa to 55 kPa (5.8 to 8 psi)

C. 35 kPa to 70 kPa (5.1 to 10.2 psi)

D. 25 kPa to 45 kPa (3.6 to 6.5 psi)

E. 20 kPa to 30 kPa (2.9 to 4.4 psi)

A

C. 35 kPa to 70 kPa (5.1 to 10.2 psi)

24
Q

One of the wetted element humidifiers group is the _____ type. Select one:

A. Pan

B. Wet

C. Spray

D. Power

E. Steam

A

D. Power

Wetted element humidifiers can be divided into two general groups: Power type and Bypass type

25
Q

A typical range for the pressure setting of an automatic fill valve (pressure reducing valve) in a hot water heating system is: Select one:

A. 100 to 200 kPa

B. 80 to 103 kPa

C. 103 to 125 kPa

D. 125 to 150 kPa

E. 50 to 100 kPa

A

C. 103 to 125 kPa

26
Q

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

A. Convector

B. Ventilator

C. Hot air furnace

D. Unit heater

E. Space heater

A

A. Convector

27
Q

The low-capacity unit heater is usually not equipped with a/an: Select one:

A. Fan

B. Filter

C. Duct system

D. Blower

E. Combustion chamber

A

B. Filter

28
Q

To avoid cavitation in the pump and drawing air into the system, a positive pressure at the highest point of the system should be maintained of at least: Select one:

A. 20 kPa (2.9 psi)

B. 100 kPa (14.5 psi)

C. 76 kPa (11 psi)

D. 12 kPa (1.7 psi)

E. 52 kPa (7.5 psi)

A

D. 12 kPa (1.7 psi)

29
Q

The pressure system with pneumatic tank typically has a pump on/off pressure differential of: Select one:

A. 180 kPa (26 psi)

B. 100 kPa (14.5 psi)

C. 160 kPa (23.2 psi)

D. 120 kPa (17.4 psi)

E. 140 kPa (20 psi)

A

E. 140 kPa (20 psi)

30
Q

In the _____ system the maximum building demand for water is less than the maximum flow available from a municipal or local distribution system. Select one:

A. Pressure with pneumatic tank

B. Tank variable pressure

C. Indirect constant pressure

D. Tankless constant pressure

E. Direct pressure

A

D. Tankless constant pressure

B2P12-3

Tankless constant pressure system:
This system is used when the maximum building demand for water is less than the maximum flow available from a municipal or local distribution system.

31
Q

As water moves vertically up the risers in the building it will lose approximately _____ for every meter (for every foot) in elevation. Select one:

A. 20 kPa (2.9 psi)

B. 5 kPa (0.7 psi)

C. 15 kPa (2 psi)

D. 10 kPa (1.5 psi)

E. 25 kPa (3.6 psi)

A

D. 10 kPa (1.5 psi)

B2P12-3

Note that as the water moves vertically up the risers in the building, it will lose approximately 10 kpa for every metre (1/2 psi per foot) in elevation.

32
Q

The pressure in the building plumbing system should not drop below ___ at any location:

A. 150 kpa (20 psi)

B. 175 kpa (25 psi)

C. 250 kpa (35 psi)

D. 300 kpa (42 psi)

A

B. 175 kpa (25 psi)

BCIT 5th class values (6 decks)

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